From 8a915186331f1c99b4b0875ab1927b47d35fd760 Mon Sep 17 00:00:00 2001
From: Justine Tunney <jtunney@gmail.com>
Date: Sat, 10 Apr 2021 16:22:35 -0700
Subject: [PATCH] Fix issues revealed by ECMAScript test262

Cosmopolitan's QuickJS is now equally conformant and performant, with
the exception of Atomics, which have been disabled since Cosmopolitan
currently doesn't support pthreads.

QuickJS memory usage -- BigNum 2021-03-27 version, 64-bit, malloc limit: -1

NAME                    COUNT     SIZE
memory allocated          937   131764  (140.6 per block)
memory used               938   116103  (8 overhead, 16.7 average slack)
atoms                     513    21408  (41.7 per atom)
objects                   170    12279  (72.2 per object)
  properties              864    15531  (5.1 per object)
  shapes                   58    12995  (224.1 per shape)
bytecode functions         13     1512
  bytecode                 13      867  (66.7 per function)
C functions                99
arrays                      1
  fast arrays               1
  elements                  1       16  (1.0 per fast array)

Result: 35/74740 errors, 1279 excluded, 485 skipped, 19 new, 2 fixed

real    2m40.828s
user    2m29.764s
sys     0m10.939s
---
 build/bootstrap/compile.com        | Bin 77824 -> 77824 bytes
 build/config.mk                    |   5 +-
 examples/walk.c                    |  52 +++++++++
 libc/runtime/fesetround.c          |   2 -
 libc/runtime/fltrounds.c           |  14 ++-
 libc/testlib/formatfloat.c         |   7 +-
 libc/tinymath/atanh.c              |   2 +-
 libc/tinymath/atanhf.c             |   2 +-
 libc/tinymath/atanhl.c             |   2 +-
 libc/tinymath/expm1l.S             |  12 +-
 libc/tinymath/powl.c               |   6 +-
 libc/tinymath/sinh.c               |   1 +
 libc/tinymath/sinhf.c              |   1 +
 libc/tinymath/sinhl.c              |   1 +
 libc/tinymath/tanh.c               |   1 +
 libc/tinymath/tanhf.c              |   1 +
 libc/tinymath/tanhl.c              |   1 +
 test/libc/tinymath/atan2_test.c    |   5 +
 test/libc/tinymath/atanh_test.c    |   3 +
 test/libc/tinymath/expm1_test.c    |  40 +++++--
 test/libc/tinymath/powl_test.c     |  15 +++
 test/libc/tinymath/sinh_test.c     |   3 +
 test/libc/tinymath/strtod_test.c   |  57 +++++++++
 test/libc/tinymath/tanh_test.c     |   3 +
 test/libc/tinymath/test.mk         |   3 +-
 third_party/gdtoa/gdtoa.internal.h |   3 +
 third_party/gdtoa/gdtoa.mk         |   7 --
 third_party/gdtoa/strtod.c         |   2 +-
 third_party/lua/lua.mk             |   2 +-
 third_party/musl/ftw.c             |   6 +
 third_party/musl/nftw.c            |  19 ++-
 third_party/quickjs/README.cosmo   |   7 +-
 third_party/quickjs/quickjs-libc.c |  57 +--------
 third_party/quickjs/quickjs.c      |  20 ++--
 third_party/quickjs/quickjs.mk     | 182 ++++++++++++++++++++---------
 third_party/quickjs/run-test262.c  |   7 +-
 third_party/quickjs/test262.conf   |  23 ++--
 tool/build/compile.c               |   5 +
 38 files changed, 395 insertions(+), 184 deletions(-)
 create mode 100644 examples/walk.c
 create mode 100644 test/libc/tinymath/strtod_test.c

diff --git a/build/bootstrap/compile.com b/build/bootstrap/compile.com
index 347df93b0e84d2fba538d85bc2a070fa1dd6fed3..0073592d8e727a6fbc51b8837b3640316e662a4b 100755
GIT binary patch
delta 25837
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diff --git a/build/config.mk b/build/config.mk
index e04ca5584..141977aef 100644
--- a/build/config.mk
+++ b/build/config.mk
@@ -69,6 +69,9 @@ CONFIG_CCFLAGS +=		\
 	$(BACKTRACES)		\
 	-O2
 
+TARGET_ARCH ?=			\
+	-msse3
+
 endif
 
 # Debug Mode
@@ -88,7 +91,7 @@ CONFIG_CPPFLAGS +=		\
 CONFIG_CCFLAGS +=		\
 	$(BACKTRACES)		\
 	$(FTRACE)		\
-	-O2
+	-Og
 
 CONFIG_COPTS +=			\
 	$(SECURITY_BLANKETS)	\
diff --git a/examples/walk.c b/examples/walk.c
new file mode 100644
index 000000000..31f5fc405
--- /dev/null
+++ b/examples/walk.c
@@ -0,0 +1,52 @@
+#if 0
+/*─────────────────────────────────────────────────────────────────╗
+│ To the extent possible under law, Justine Tunney has waived      │
+│ all copyright and related or neighboring rights to this file,    │
+│ as it is written in the following disclaimers:                   │
+│   • http://unlicense.org/                                        │
+│   • http://creativecommons.org/publicdomain/zero/1.0/            │
+╚─────────────────────────────────────────────────────────────────*/
+#endif
+#include "libc/calls/calls.h"
+#include "libc/calls/struct/stat.h"
+#include "libc/log/log.h"
+#include "libc/runtime/runtime.h"
+#include "libc/sysv/consts/exit.h"
+#include "third_party/musl/ftw.h"
+
+/**
+ * @fileoverview Directory walker example.
+ * Copied from IEEE Std 1003.1-2017
+ */
+
+static int display_info(const char *fpath, const struct stat *sb, int tflag,
+                        struct FTW *ftwbuf) {
+  printf("%-3s %2d %7jd   %-40s %d %s\n",
+         (tflag == FTW_D)     ? "d"
+         : (tflag == FTW_DNR) ? "dnr"
+         : (tflag == FTW_DP)  ? "dp"
+         : (tflag == FTW_F)   ? (S_ISBLK(sb->st_mode)    ? "f b"
+                                 : S_ISCHR(sb->st_mode)  ? "f c"
+                                 : S_ISFIFO(sb->st_mode) ? "f p"
+                                 : S_ISREG(sb->st_mode)  ? "f r"
+                                 : S_ISSOCK(sb->st_mode) ? "f s"
+                                                         : "f ?")
+         : (tflag == FTW_NS)  ? "ns"
+         : (tflag == FTW_SL)  ? "sl"
+         : (tflag == FTW_SLN) ? "sln"
+                              : "?",
+         ftwbuf->level, (intmax_t)sb->st_size, fpath, ftwbuf->base,
+         fpath + ftwbuf->base);
+  return 0; /* To tell nftw() to continue */
+}
+
+int main(int argc, char *argv[]) {
+  int flags = 0;
+  if (argc > 2 && strchr(argv[2], 'd') != NULL) flags |= FTW_DEPTH;
+  if (argc > 2 && strchr(argv[2], 'p') != NULL) flags |= FTW_PHYS;
+  if (nftw((argc < 2) ? "." : argv[1], display_info, 20, flags) == -1) {
+    perror("nftw");
+    exit(EXIT_FAILURE);
+  }
+  exit(EXIT_SUCCESS);
+}
diff --git a/libc/runtime/fesetround.c b/libc/runtime/fesetround.c
index f55465f35..3b8896c4e 100644
--- a/libc/runtime/fesetround.c
+++ b/libc/runtime/fesetround.c
@@ -18,8 +18,6 @@
 ╚─────────────────────────────────────────────────────────────────────────────*/
 #include "libc/runtime/fenv.h"
 
-/* TODO(jart): This needs tests. */
-
 /**
  * Sets rounding mode.
  *
diff --git a/libc/runtime/fltrounds.c b/libc/runtime/fltrounds.c
index 3b90c0f41..c3a8920b8 100644
--- a/libc/runtime/fltrounds.c
+++ b/libc/runtime/fltrounds.c
@@ -19,16 +19,18 @@
 #include "libc/runtime/fenv.h"
 
 int __flt_rounds(void) {
-  switch (fegetround()) {
-    case FE_TOWARDZERO:
+  int x87cw;
+  asm("fnstcw\t%0" : "=m"(x87cw));
+  switch ((x87cw & 0x0c00) >> 10) {
+    case FE_TOWARDZERO >> 10:
       return 0;
-    case FE_TONEAREST:
+    case FE_TONEAREST >> 10:
       return 1;
-    case FE_UPWARD:
+    case FE_UPWARD >> 10:
       return 2;
-    case FE_DOWNWARD:
+    case FE_DOWNWARD >> 10:
       return 3;
     default:
-      return -1;
+      unreachable;
   }
 }
diff --git a/libc/testlib/formatfloat.c b/libc/testlib/formatfloat.c
index d515c66ba..0056a8ded 100644
--- a/libc/testlib/formatfloat.c
+++ b/libc/testlib/formatfloat.c
@@ -19,12 +19,9 @@
 #include "libc/fmt/fmt.h"
 #include "libc/mem/mem.h"
 #include "libc/testlib/testlib.h"
+#include "libc/x/x.h"
 #include "third_party/gdtoa/gdtoa.h"
 
 testonly char *testlib_formatfloat(long double x) {
-  char buf[32];
-  char *str = malloc(256);
-  g_xfmt_p(buf, &x, 15, sizeof(buf), 0);
-  sprintf(str, "%Lf (%s)", x, buf);
-  return str;
+  return xasprintf("%.15Lg", x);
 }
diff --git a/libc/tinymath/atanh.c b/libc/tinymath/atanh.c
index 7927aa709..3548943d4 100644
--- a/libc/tinymath/atanh.c
+++ b/libc/tinymath/atanh.c
@@ -22,5 +22,5 @@
  * Returns inverse hyperbolic tangent of 𝑥.
  */
 double atanh(double x) {
-  return log((1 + x) / (1 - x)) / 2;
+  return x ? log((1 + x) / (1 - x)) / 2 : x;
 }
diff --git a/libc/tinymath/atanhf.c b/libc/tinymath/atanhf.c
index 702a4ae34..ef27074bf 100644
--- a/libc/tinymath/atanhf.c
+++ b/libc/tinymath/atanhf.c
@@ -22,5 +22,5 @@
  * Returns inverse hyperbolic tangent of 𝑥.
  */
 float atanhf(float x) {
-  return logf((1 + x) / (1 - x)) / 2;
+  return x ? logf((1 + x) / (1 - x)) / 2 : x;
 }
diff --git a/libc/tinymath/atanhl.c b/libc/tinymath/atanhl.c
index 54baf9bc4..a88347d18 100644
--- a/libc/tinymath/atanhl.c
+++ b/libc/tinymath/atanhl.c
@@ -22,5 +22,5 @@
  * Returns inverse hyperbolic tangent of 𝑥.
  */
 long double atanhl(long double x) {
-  return logl((1 + x) / (1 - x)) / 2;
+  return x ? logl((1 + x) / (1 - x)) / 2 : x;
 }
diff --git a/libc/tinymath/expm1l.S b/libc/tinymath/expm1l.S
index d12f779d6..f5852d861 100644
--- a/libc/tinymath/expm1l.S
+++ b/libc/tinymath/expm1l.S
@@ -19,7 +19,7 @@
 #include "libc/runtime/pc.internal.h"
 #include "libc/macros.internal.h"
 
-//	Returns 𝑒^x-1.
+//	Returns 𝑒^𝑥-𝟷.
 //
 //	@param	𝑥 is an 80-bit long double passed on stack in 16-bytes
 //	@return	result of exponentiation on FPU stack in %st
@@ -27,11 +27,13 @@ expm1l:	push	%rbp
 	mov	%rsp,%rbp
 	.profilable
 	fldt	16(%rbp)
-	fxam					# isinf(x)
+	fxam
 	fstsw	%ax
 	mov	%ah,%al
-	and	$0x45,%ah
-	cmp	$5,%ah
+	and	$(FPU_C3|FPU_C2|FPU_C0)>>8,%ah
+	cmp	$(FPU_C3)>>8,%ah		# !x
+	je	0f
+	cmp	$(FPU_C2|FPU_C0)>>8,%ah		# isinf(x)
 	je	1f
 	fldl2e
 	fmulp	%st,%st(1)
@@ -50,7 +52,7 @@ expm1l:	push	%rbp
 	faddp	%st,%st(1)
 0:	pop	%rbp
 	ret
-1:	test	$2,%al				# signbit(x)
+1:	test	$FPU_C1>>8,%al			# signbit(x)
 	jz	0b
 	fstp	%st
 	fld1
diff --git a/libc/tinymath/powl.c b/libc/tinymath/powl.c
index 9ecdc23dd..e2a58a23b 100644
--- a/libc/tinymath/powl.c
+++ b/libc/tinymath/powl.c
@@ -46,7 +46,11 @@ long double powl(long double x, long double y) {
             return 1;
           }
         } else if (y > 0) {
-          return y == 1 ? x : 0;
+          if (signbit(x) && y == truncl(y) && ((int64_t)y & 1)) {
+            return -0.;
+          } else {
+            return 0;
+          }
         } else if (!y) {
           return 1;
         } else {
diff --git a/libc/tinymath/sinh.c b/libc/tinymath/sinh.c
index 6cab29aa8..f0e998b7e 100644
--- a/libc/tinymath/sinh.c
+++ b/libc/tinymath/sinh.c
@@ -22,5 +22,6 @@
  * Returns hyperbolic sine of 𝑥.
  */
 double sinh(double x) {
+  if (!x) return x;
   return (exp(x) - exp(-x)) / 2;
 }
diff --git a/libc/tinymath/sinhf.c b/libc/tinymath/sinhf.c
index db7088279..73a013c22 100644
--- a/libc/tinymath/sinhf.c
+++ b/libc/tinymath/sinhf.c
@@ -22,5 +22,6 @@
  * Returns hyperbolic sine of 𝑥.
  */
 float sinhf(float x) {
+  if (!x) return x;
   return (expf(x) - expf(-x)) / 2;
 }
diff --git a/libc/tinymath/sinhl.c b/libc/tinymath/sinhl.c
index 16c79e330..c2a09d892 100644
--- a/libc/tinymath/sinhl.c
+++ b/libc/tinymath/sinhl.c
@@ -22,5 +22,6 @@
  * Returns hyperbolic sine of 𝑥.
  */
 long double sinhl(long double x) {
+  if (!x) return x;
   return (expl(x) - expl(-x)) / 2;
 }
diff --git a/libc/tinymath/tanh.c b/libc/tinymath/tanh.c
index 8139d00f0..5ae19c19f 100644
--- a/libc/tinymath/tanh.c
+++ b/libc/tinymath/tanh.c
@@ -22,6 +22,7 @@
  * Returns hyperbolic tangent of 𝑥.
  */
 double tanh(double x) {
+  if (!x) return x;
   if (isinf(x)) return copysign(1, x);
   return sinh(x) / cosh(x);
 }
diff --git a/libc/tinymath/tanhf.c b/libc/tinymath/tanhf.c
index aef44313f..d9f491de7 100644
--- a/libc/tinymath/tanhf.c
+++ b/libc/tinymath/tanhf.c
@@ -22,6 +22,7 @@
  * Returns hyperbolic tangent of 𝑥.
  */
 float tanhf(float x) {
+  if (!x) return x;
   if (isinf(x)) return copysignf(1, x);
   return sinhf(x) / coshf(x);
 }
diff --git a/libc/tinymath/tanhl.c b/libc/tinymath/tanhl.c
index 3c76761bf..7d0a41e01 100644
--- a/libc/tinymath/tanhl.c
+++ b/libc/tinymath/tanhl.c
@@ -22,6 +22,7 @@
  * Returns hyperbolic tangent of 𝑥.
  */
 long double tanhl(long double x) {
+  if (!x) return x;
   if (isinf(x)) return copysignl(1, x);
   return sinhl(x) / coshl(x);
 }
diff --git a/test/libc/tinymath/atan2_test.c b/test/libc/tinymath/atan2_test.c
index 82350d494..976ff5f2f 100644
--- a/test/libc/tinymath/atan2_test.c
+++ b/test/libc/tinymath/atan2_test.c
@@ -282,6 +282,11 @@ TEST(atan2, test) {
                gc(xasprintf("%.15g", atan2(__DBL_MAX__, __DBL_MIN__))));
   EXPECT_STREQ("0.785398163397448",
                gc(xasprintf("%.15g", atan2(__DBL_MAX__, __DBL_MAX__))));
+  EXPECT_STREQ("-0",
+               gc(xasprintf("%.15g", atan2(-0.000000000000001, INFINITY))));
+  EXPECT_STREQ("-0", gc(xasprintf("%.15g", atan2(-1, INFINITY))));
+  EXPECT_STREQ(
+      "-0", gc(xasprintf("%.15g", atan2(-1.7976931348623157e308, INFINITY))));
 }
 
 BENCH(atan2, bench) {
diff --git a/test/libc/tinymath/atanh_test.c b/test/libc/tinymath/atanh_test.c
index 2f7de8c53..f096cc212 100644
--- a/test/libc/tinymath/atanh_test.c
+++ b/test/libc/tinymath/atanh_test.c
@@ -27,6 +27,7 @@
 
 TEST(atanh, test) {
   EXPECT_STREQ("0", gc(xdtoa(atanh(0))));
+  EXPECT_STREQ("-0", gc(xdtoa(atanh(-0.))));
   EXPECT_STREQ(".549306144334055", gc(xdtoa(atanh(.5))));
   EXPECT_STREQ("-.549306144334055", gc(xdtoa(atanh(-.5))));
   EXPECT_STREQ("INFINITY", gc(xdtoa(atanh(+1))));
@@ -37,6 +38,7 @@ TEST(atanh, test) {
 
 TEST(atanhl, test) {
   EXPECT_STREQ("0", gc(xdtoal(atanhl(0))));
+  EXPECT_STREQ("-0", gc(xdtoal(atanhl(-0.))));
   EXPECT_STREQ(".5493061443340548", gc(xdtoal(atanhl(.5))));
   EXPECT_STREQ("-.5493061443340548", gc(xdtoal(atanhl(-.5))));
   EXPECT_STREQ("INFINITY", gc(xdtoal(atanhl(+1))));
@@ -47,6 +49,7 @@ TEST(atanhl, test) {
 
 TEST(atanhf, test) {
   EXPECT_STREQ("0", gc(xdtoaf(atanhf(0))));
+  EXPECT_STREQ("-0", gc(xdtoaf(atanhf(-0.))));
   EXPECT_STREQ(".549306", gc(xdtoaf(atanhf(.5))));
   EXPECT_STREQ("-.549306", gc(xdtoaf(atanhf(-.5))));
   EXPECT_STREQ("INFINITY", gc(xdtoaf(atanhf(+1))));
diff --git a/test/libc/tinymath/expm1_test.c b/test/libc/tinymath/expm1_test.c
index 2da3221c6..2d218a26f 100644
--- a/test/libc/tinymath/expm1_test.c
+++ b/test/libc/tinymath/expm1_test.c
@@ -25,11 +25,37 @@
 #define expm1(x)  expm1(VEIL("x", (double)(x)))
 #define expm1f(x) expm1f(VEIL("x", (float)(x)))
 
+TEST(expm1, test) {
+  EXPECT_STREQ("0", gc(xdtoa(expm1(0))));
+  EXPECT_STREQ("-0", gc(xdtoa(expm1(-0.))));
+  EXPECT_STREQ("NAN", gc(xdtoa(expm1(NAN))));
+  EXPECT_STREQ("-1", gc(xdtoa(expm1(-INFINITY))));
+  EXPECT_STREQ("INFINITY", gc(xdtoa(expm1(INFINITY))));
+  /* EXPECT_STREQ("-INFINITY", gc(xdtoa(expm1(-132098844872390)))); */
+  /* EXPECT_STREQ("INFINITY", gc(xdtoa(expm1(132098844872390)))); */
+  EXPECT_STREQ("0", gc(xasprintf("%.15g", expm1(0.))));
+  EXPECT_STREQ("-0", gc(xasprintf("%.15g", expm1(-0.))));
+  EXPECT_STREQ("0.648721270700128", gc(xasprintf("%.15g", expm1(.5))));
+  EXPECT_STREQ("-0.393469340287367", gc(xasprintf("%.15g", expm1(-.5))));
+  EXPECT_STREQ("1.71828182845905", gc(xasprintf("%.15g", expm1(1.))));
+  EXPECT_STREQ("-0.632120558828558", gc(xasprintf("%.15g", expm1(-1.))));
+  EXPECT_STREQ("3.48168907033806", gc(xasprintf("%.15g", expm1(1.5))));
+  EXPECT_STREQ("-0.77686983985157", gc(xasprintf("%.15g", expm1(-1.5))));
+  EXPECT_STREQ("6.38905609893065", gc(xasprintf("%.15g", expm1(2.))));
+  EXPECT_TRUE(isnan(expm1(NAN)));
+  EXPECT_TRUE(isnan(expm1(-NAN)));
+  EXPECT_STREQ("inf", gc(xasprintf("%.15g", expm1(INFINITY))));
+  EXPECT_STREQ("-1", gc(xasprintf("%.15g", expm1(-INFINITY))));
+  EXPECT_STREQ("2.2250738585072e-308",
+               gc(xasprintf("%.15g", expm1(__DBL_MIN__))));
+  EXPECT_STREQ("inf", gc(xasprintf("%.15g", expm1(__DBL_MAX__))));
+}
+
 TEST(expm1l, test) {
   EXPECT_STREQ("1.718281828459045", gc(xdtoal(expm1l(1))));
   EXPECT_STREQ("1.718281828459045", gc(xdtoal(expl(1) - 1)));
   EXPECT_STREQ("0", gc(xdtoal(expm1l(0))));
-  EXPECT_STREQ("0", gc(xdtoal(expm1l(-0.))));
+  EXPECT_STREQ("-0", gc(xdtoal(expm1l(-0.))));
   EXPECT_STREQ("NAN", gc(xdtoal(expm1l(NAN))));
   EXPECT_STREQ("-1", gc(xdtoal(expm1l(-INFINITY))));
   EXPECT_STREQ("INFINITY", gc(xdtoal(expm1l(INFINITY))));
@@ -37,19 +63,9 @@ TEST(expm1l, test) {
   /* EXPECT_STREQ("INFINITY", gc(xdtoal(expm1l(132098844872390)))); */
 }
 
-TEST(expm1, test) {
-  EXPECT_STREQ("0", gc(xdtoa(expm1(0))));
-  EXPECT_STREQ("0", gc(xdtoa(expm1(-0.))));
-  EXPECT_STREQ("NAN", gc(xdtoa(expm1(NAN))));
-  EXPECT_STREQ("-1", gc(xdtoa(expm1(-INFINITY))));
-  EXPECT_STREQ("INFINITY", gc(xdtoa(expm1(INFINITY))));
-  /* EXPECT_STREQ("-INFINITY", gc(xdtoa(expm1(-132098844872390)))); */
-  /* EXPECT_STREQ("INFINITY", gc(xdtoa(expm1(132098844872390)))); */
-}
-
 TEST(expm1f, test) {
   EXPECT_STREQ("0", gc(xdtoaf(expm1f(0))));
-  EXPECT_STREQ("0", gc(xdtoaf(expm1f(-0.))));
+  EXPECT_STREQ("-0", gc(xdtoaf(expm1f(-0.))));
   EXPECT_STREQ("NAN", gc(xdtoaf(expm1f(NAN))));
   EXPECT_STREQ("-1", gc(xdtoaf(expm1f(-INFINITY))));
   EXPECT_STREQ("INFINITY", gc(xdtoaf(expm1f(INFINITY))));
diff --git a/test/libc/tinymath/powl_test.c b/test/libc/tinymath/powl_test.c
index 971ecf22b..2922692f0 100644
--- a/test/libc/tinymath/powl_test.c
+++ b/test/libc/tinymath/powl_test.c
@@ -100,6 +100,8 @@ TEST(powl, test) {
   EXPECT_TRUE(isnan(powl(-3, -(1. / MAX(rando, 2)))));
   EXPECT_STREQ("-.3333333333333333", gc(xdtoal(powl(-3, -1))));
   EXPECT_STREQ(".1111111111111111", gc(xdtoal(powl(-3, -2))));
+  EXPECT_STREQ("-0", gc(xdtoal(powl(-0., MAX(1, rando) | 1))));
+  EXPECT_STREQ("0", gc(xdtoal(powl(-0., MAX(1, rando) & ~1))));
 }
 
 TEST(pow, test) {
@@ -150,6 +152,8 @@ TEST(pow, test) {
   EXPECT_STREQ("inf", fmtd(pow(-0., -(rando & -2))));
   EXPECT_STREQ("-0.333333333333333", fmtd(pow(-3, -1)));
   EXPECT_STREQ("0.111111111111111", fmtd(pow(-3, -2)));
+  EXPECT_STREQ("-0", gc(xdtoa(pow(-0., MAX(1, rando) | 1))));
+  EXPECT_STREQ("0", gc(xdtoa(pow(-0., MAX(1, rando) & ~1))));
 }
 
 TEST(powf, test) {
@@ -200,6 +204,8 @@ TEST(powf, test) {
   EXPECT_STREQ("inf", fmtf(powf(-0., -(rando & -2))));
   EXPECT_STREQ("-0.333333", fmtf(powf(-3, -1)));
   EXPECT_STREQ("0.111111", fmtf(powf(-3, -2)));
+  EXPECT_STREQ("-0", gc(xdtoaf(powf(-0., MAX(1, rando) | 1))));
+  EXPECT_STREQ("0", gc(xdtoaf(powf(-0., MAX(1, rando) & ~1))));
 }
 
 TEST(powl, errors) {
@@ -537,6 +543,15 @@ TEST(powl, errors) {
   errno = 0;
   EXPECT_STREQ("inf", fmtd(pow(__DBL_MAX__, __DBL_MAX__)));
   /* EXPECT_EQ(ERANGE, errno); */
+  EXPECT_STREQ("1", gc(xasprintf("%.15g", pow(0., 0))));
+  EXPECT_STREQ("1", gc(xasprintf("%.15g", pow(-0., 0))));
+  EXPECT_STREQ("-0", gc(xasprintf("%.15g", pow(-0., 1))));
+  EXPECT_STREQ("-0", gc(xasprintf("%.15g", pow(-0., 11))));
+  EXPECT_STREQ("-0", gc(xasprintf("%.15g", pow(-0., 111))));
+  EXPECT_STREQ("0", gc(xasprintf("%.15g", pow(-0., 2))));
+  EXPECT_STREQ("0", gc(xasprintf("%.15g", pow(-0., 22))));
+  EXPECT_STREQ("0", gc(xasprintf("%.15g", pow(-0., 222))));
+  EXPECT_STREQ("0", gc(xasprintf("%.15g", pow(-0., 2.5))));
 }
 
 BENCH(powl, bench) {
diff --git a/test/libc/tinymath/sinh_test.c b/test/libc/tinymath/sinh_test.c
index 6cdbe9845..653bb560b 100644
--- a/test/libc/tinymath/sinh_test.c
+++ b/test/libc/tinymath/sinh_test.c
@@ -31,6 +31,7 @@ TEST(sinh, test) {
   EXPECT_STREQ("INFINITY", gc(xdtoa(sinh(30000))));
   EXPECT_STREQ("-INFINITY", gc(xdtoa(sinh(-30000))));
   EXPECT_STREQ("0", gc(xdtoa(sinh(0))));
+  EXPECT_STREQ("-0", gc(xdtoa(sinh(-0.))));
   EXPECT_STREQ("NAN", gc(xdtoa(sinh(NAN))));
   EXPECT_STREQ("INFINITY", gc(xdtoa(sinh(INFINITY))));
   EXPECT_STREQ("-INFINITY", gc(xdtoa(sinh(-INFINITY))));
@@ -42,6 +43,7 @@ TEST(sinhl, test) {
   EXPECT_STREQ("INFINITY", gc(xdtoal(sinhl(30000))));
   EXPECT_STREQ("-INFINITY", gc(xdtoal(sinhl(-30000))));
   EXPECT_STREQ("0", gc(xdtoal(sinhl(0))));
+  EXPECT_STREQ("-0", gc(xdtoal(sinhl(-0.))));
   EXPECT_STREQ("NAN", gc(xdtoal(sinhl(NAN))));
   EXPECT_STREQ("INFINITY", gc(xdtoal(sinhl(INFINITY))));
   EXPECT_STREQ("-INFINITY", gc(xdtoal(sinhl(-INFINITY))));
@@ -53,6 +55,7 @@ TEST(sinhf, test) {
   EXPECT_STREQ("INFINITY", gc(xdtoaf(sinhf(30000))));
   EXPECT_STREQ("-INFINITY", gc(xdtoaf(sinhf(-30000))));
   EXPECT_STREQ("0", gc(xdtoaf(sinhf(0))));
+  EXPECT_STREQ("-0", gc(xdtoaf(sinhf(-0.))));
   EXPECT_STREQ("NAN", gc(xdtoaf(sinhf(NAN))));
   EXPECT_STREQ("INFINITY", gc(xdtoaf(sinhf(INFINITY))));
   EXPECT_STREQ("-INFINITY", gc(xdtoaf(sinhf(-INFINITY))));
diff --git a/test/libc/tinymath/strtod_test.c b/test/libc/tinymath/strtod_test.c
new file mode 100644
index 000000000..f6ee4fdc8
--- /dev/null
+++ b/test/libc/tinymath/strtod_test.c
@@ -0,0 +1,57 @@
+/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
+│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8                                :vi│
+╞══════════════════════════════════════════════════════════════════════════════╡
+│ Copyright 2021 Justine Alexandra Roberts Tunney                              │
+│                                                                              │
+│ Permission to use, copy, modify, and/or distribute this software for         │
+│ any purpose with or without fee is hereby granted, provided that the         │
+│ above copyright notice and this permission notice appear in all copies.      │
+│                                                                              │
+│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL                │
+│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED                │
+│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE             │
+│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL         │
+│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR        │
+│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER               │
+│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR             │
+│ PERFORMANCE OF THIS SOFTWARE.                                                │
+╚─────────────────────────────────────────────────────────────────────────────*/
+#include "libc/runtime/fenv.h"
+#include "libc/runtime/gc.internal.h"
+#include "libc/testlib/testlib.h"
+#include "libc/x/x.h"
+#include "third_party/gdtoa/gdtoa.h"
+
+int oldround;
+
+void SetUp(void) {
+  oldround = fegetround();
+}
+
+void TearDown(void) {
+  fesetround(oldround);
+}
+
+TEST(strtod, testNearest) {
+  fesetround(FE_TONEAREST);
+  EXPECT_STREQ("-1.79769313486231e+308",
+               gc(xasprintf("%.15g", strtod("-1.79769313486231e+308", NULL))));
+}
+
+TEST(strtod, testDownward) {
+  fesetround(FE_DOWNWARD);
+  EXPECT_STREQ("-1.79769313486232e+308",
+               gc(xasprintf("%.15g", strtod("-1.79769313486231e+308", NULL))));
+}
+
+TEST(strtod, testUpward) {
+  fesetround(FE_UPWARD);
+  EXPECT_STREQ("-1.7976931348623e+308",
+               gc(xasprintf("%.15g", strtod("-1.79769313486231e+308", NULL))));
+}
+
+TEST(strtod, testTowardzero) {
+  fesetround(FE_TOWARDZERO);
+  EXPECT_STREQ("-1.7976931348623e+308",
+               gc(xasprintf("%.15g", strtod("-1.79769313486231e+308", NULL))));
+}
diff --git a/test/libc/tinymath/tanh_test.c b/test/libc/tinymath/tanh_test.c
index b1a59544d..65f922d0f 100644
--- a/test/libc/tinymath/tanh_test.c
+++ b/test/libc/tinymath/tanh_test.c
@@ -29,6 +29,7 @@ TEST(tanhl, test) {
   EXPECT_STREQ(".09966799462495582", gc(xdtoal(tanhl(+.1))));
   EXPECT_STREQ("-.09966799462495582", gc(xdtoal(tanhl(-.1))));
   EXPECT_STREQ("0", gc(xdtoal(tanhl(0))));
+  EXPECT_STREQ("-0", gc(xdtoal(tanhl(-0.))));
   EXPECT_TRUE(isnan(tanhl(NAN)));
   EXPECT_STREQ("1", gc(xdtoal(tanhl(INFINITY))));
   EXPECT_STREQ("-1", gc(xdtoal(tanhl(-INFINITY))));
@@ -38,6 +39,7 @@ TEST(tanh, test) {
   EXPECT_STREQ(".0996679946249559", gc(xdtoa(tanh(+.1))));
   EXPECT_STREQ("-.0996679946249559", gc(xdtoa(tanh(-.1))));
   EXPECT_STREQ("0", gc(xdtoa(tanh(0))));
+  EXPECT_STREQ("-0", gc(xdtoa(tanh(-0.))));
   EXPECT_TRUE(isnan(tanh(NAN)));
   EXPECT_STREQ("1", gc(xdtoa(tanh(INFINITY))));
   EXPECT_STREQ("-1", gc(xdtoa(tanh(-INFINITY))));
@@ -47,6 +49,7 @@ TEST(tanhf, test) {
   EXPECT_STREQ(".099668", gc(xdtoaf(tanhf(+.1))));
   EXPECT_STREQ("-.099668", gc(xdtoaf(tanhf(-.1))));
   EXPECT_STREQ("0", gc(xdtoaf(tanhf(0))));
+  EXPECT_STREQ("-0", gc(xdtoaf(tanhf(-0.))));
   EXPECT_TRUE(isnan(tanhf(NAN)));
   EXPECT_STREQ("1", gc(xdtoaf(tanhf(INFINITY))));
   EXPECT_STREQ("-1", gc(xdtoaf(tanhf(-INFINITY))));
diff --git a/test/libc/tinymath/test.mk b/test/libc/tinymath/test.mk
index 641693130..4feea7a30 100644
--- a/test/libc/tinymath/test.mk
+++ b/test/libc/tinymath/test.mk
@@ -37,7 +37,8 @@ TEST_LIBC_TINYMATH_DIRECTDEPS =					\
 	LIBC_TESTLIB						\
 	LIBC_TINYMATH						\
 	LIBC_UNICODE						\
-	LIBC_X
+	LIBC_X							\
+	THIRD_PARTY_GDTOA
 
 TEST_LIBC_TINYMATH_DEPS :=					\
 	$(call uniq,$(foreach x,$(TEST_LIBC_TINYMATH_DIRECTDEPS),$($(x))))
diff --git a/third_party/gdtoa/gdtoa.internal.h b/third_party/gdtoa/gdtoa.internal.h
index 0a74b0556..970015a47 100644
--- a/third_party/gdtoa/gdtoa.internal.h
+++ b/third_party/gdtoa/gdtoa.internal.h
@@ -18,6 +18,9 @@ asm(".include \"libc/disclaimer.inc\"");
 #define d_QNAN0          0x7ff80000
 #define d_QNAN1          0x0
 
+#define Check_FLT_ROUNDS 1
+#define Trust_FLT_ROUNDS 1
+
 /****************************************************************
 
 The author of this software is David M. Gay.
diff --git a/third_party/gdtoa/gdtoa.mk b/third_party/gdtoa/gdtoa.mk
index d9e15e57b..c253ef9a6 100644
--- a/third_party/gdtoa/gdtoa.mk
+++ b/third_party/gdtoa/gdtoa.mk
@@ -46,13 +46,6 @@ $(THIRD_PARTY_GDTOA_A).pkg:				\
 		$(THIRD_PARTY_GDTOA_A_OBJS)		\
 		$(foreach x,$(THIRD_PARTY_GDTOA_A_DIRECTDEPS),$($(x)_A).pkg)
 
-$(THIRD_PARTY_GDTOA_A_OBJS):				\
-	OVERRIDE_CFLAGS +=				\
-		$(OLD_CODE)				\
-		$(IEEE_MATH)				\
-		-ffunction-sections			\
-		-fdata-sections
-
 THIRD_PARTY_GDTOA_LIBS = $(foreach x,$(THIRD_PARTY_GDTOA_ARTIFACTS),$($(x)))
 THIRD_PARTY_GDTOA_SRCS = $(foreach x,$(THIRD_PARTY_GDTOA_ARTIFACTS),$($(x)_SRCS))
 THIRD_PARTY_GDTOA_HDRS = $(foreach x,$(THIRD_PARTY_GDTOA_ARTIFACTS),$($(x)_HDRS))
diff --git a/third_party/gdtoa/strtod.c b/third_party/gdtoa/strtod.c
index 1080b6b34..19f2de989 100644
--- a/third_party/gdtoa/strtod.c
+++ b/third_party/gdtoa/strtod.c
@@ -729,7 +729,7 @@ strtod(CONST char *s00, char **se)
 				}
 #endif /*Sudden_Underflow*/
 #endif /*Avoid_Underflow*/
-			dval(&adj) *= ulp(&rv);
+			dval(&adj) *= ulp(&rv); /* XXX */
 			if (dsign) {
 				if (word0(&rv) == Big0 && word1(&rv) == Big1)
 					goto ovfl;
diff --git a/third_party/lua/lua.mk b/third_party/lua/lua.mk
index b2628de9b..50a78b0ec 100644
--- a/third_party/lua/lua.mk
+++ b/third_party/lua/lua.mk
@@ -41,7 +41,7 @@ THIRD_PARTY_LUA_DEPS :=					\
 $(THIRD_PARTY_LUA_A):					\
 		third_party/lua/			\
 		$(THIRD_PARTY_LUA_A).pkg		\
-		$(filter-out %/lua.c,$(THIRD_PARTY_LUA_OBJS))
+		$(filter-out %/lua.o,$(THIRD_PARTY_LUA_OBJS))
 
 $(THIRD_PARTY_LUA_A).pkg:				\
 		$(THIRD_PARTY_LUA_OBJS)			\
diff --git a/third_party/musl/ftw.c b/third_party/musl/ftw.c
index ee4c54b22..51622cb51 100644
--- a/third_party/musl/ftw.c
+++ b/third_party/musl/ftw.c
@@ -34,6 +34,12 @@ asm(".include \"libc/disclaimer.inc\"");
 
 /* clang-format off */
 
+/**
+ * Walks file tree.
+ *
+ * @see examples/walk.c for example
+ * @see nftw()
+ */
 int ftw(const char *path, int (*fn)(const char *, const struct stat *, int), int fd_limit)
 {
 	/* The following cast assumes that calling a function with one
diff --git a/third_party/musl/nftw.c b/third_party/musl/nftw.c
index 15a491df8..21d31ff51 100644
--- a/third_party/musl/nftw.c
+++ b/third_party/musl/nftw.c
@@ -38,7 +38,13 @@ Musl libc (MIT License)\\n\
 Copyright 2005-2014 Rich Felker, et. al.\"");
 asm(".include \"libc/disclaimer.inc\"");
 
-#define pthread_setcancelstate(...) /* no cosmo pthreads support atm */
+/* no reason to impose windows limit
+   small enough to fit in stack frame
+   should be changed to use realloc */
+#define PATH_MAX2 2048
+
+/* no cosmo pthreads support atm */
+#define pthread_setcancelstate(...)
 
 /* clang-format off */
 
@@ -123,7 +129,7 @@ static int do_nftw(char *path, int (*fn)(const char *, const struct stat *, int,
 				 && (!de->d_name[1]
 				  || (de->d_name[1]=='.'
 				   && !de->d_name[2]))) continue;
-				if (strlen(de->d_name) >= PATH_MAX-l) {
+				if (strlen(de->d_name) >= PATH_MAX2-l) {
 					errno = ENAMETOOLONG;
 					closedir(d);
 					return -1;
@@ -149,16 +155,21 @@ static int do_nftw(char *path, int (*fn)(const char *, const struct stat *, int,
 	return 0;
 }
 
+/**
+ * Walks file tree.
+ *
+ * @see examples/walk.c for example
+ */
 int nftw(const char *path, int (*fn)(const char *, const struct stat *, int, struct FTW *), int fd_limit, int flags)
 {
 	int r, cs;
 	size_t l;
-	char pathbuf[PATH_MAX+1];
+	char pathbuf[PATH_MAX2+1];
 
 	if (fd_limit <= 0) return 0;
 
 	l = strlen(path);
-	if (l > PATH_MAX) {
+	if (l > PATH_MAX2) {
 		errno = ENAMETOOLONG;
 		return -1;
 	}
diff --git a/third_party/quickjs/README.cosmo b/third_party/quickjs/README.cosmo
index 072d819e9..c8f7ab916 100644
--- a/third_party/quickjs/README.cosmo
+++ b/third_party/quickjs/README.cosmo
@@ -1,2 +1,7 @@
 Source:
-https://bellard.org/quickjs/quickjs-2021-03-27.tar.xz
+- https://bellard.org/quickjs/quickjs-2021-03-27.tar.xz
+
+Local Changes:
+- Replace snprintf with xasprintf in find_unique_cname
+- Squash uninitialized read of harnessbuf in run-test262.c
+- Change run-test262.c to not rebase configured paths
diff --git a/third_party/quickjs/quickjs-libc.c b/third_party/quickjs/quickjs-libc.c
index 32dcc53f8..cea3b1bad 100644
--- a/third_party/quickjs/quickjs-libc.c
+++ b/third_party/quickjs/quickjs-libc.c
@@ -2764,61 +2764,6 @@ static char **build_envp(JSContext *ctx, JSValueConst obj)
     goto done;
 }
 
-/* execvpe is not available on non GNU systems */
-static int my_execvpe(const char *filename, char **argv, char **envp)
-{
-    char *path, *p, *p_next, *p1;
-    char buf[PATH_MAX];
-    size_t filename_len, path_len;
-    BOOL eacces_error;
-    
-    filename_len = strlen(filename);
-    if (filename_len == 0) {
-        errno = ENOENT;
-        return -1;
-    }
-    if (strchr(filename, '/'))
-        return execve(filename, argv, envp);
-    
-    path = getenv("PATH");
-    if (!path)
-        path = (char *)"/bin:/usr/bin";
-    eacces_error = FALSE;
-    p = path;
-    for(p = path; p != NULL; p = p_next) {
-        p1 = strchr(p, ':');
-        if (!p1) {
-            p_next = NULL;
-            path_len = strlen(p);
-        } else {
-            p_next = p1 + 1;
-            path_len = p1 - p;
-        }
-        /* path too long */
-        if ((path_len + 1 + filename_len + 1) > PATH_MAX)
-            continue;
-        memcpy(buf, p, path_len);
-        buf[path_len] = '/';
-        memcpy(buf + path_len + 1, filename, filename_len);
-        buf[path_len + 1 + filename_len] = '\0';
-        
-        execve(buf, argv, envp);
-
-        if (errno == EACCES) {
-          eacces_error = TRUE;
-        } else if (errno == ENOENT) {
-          /* do nothing */
-        } else if (errno == ENOTDIR) {
-          /* do nothing */
-        } else {
-          return -1;
-        }
-    }
-    if (eacces_error)
-        errno = EACCES;
-    return -1;
-}
-
 /* exec(args[, options]) -> exitcode */
 static JSValue js_os_exec(JSContext *ctx, JSValueConst this_val,
                           int argc, JSValueConst *argv)
@@ -2973,7 +2918,7 @@ static JSValue js_os_exec(JSContext *ctx, JSValueConst this_val,
         if (!file)
             file = exec_argv[0];
         if (use_path)
-            ret = my_execvpe(file, (char **)exec_argv, envp);
+            ret = execvpe(file, (char **)exec_argv, envp);
         else
             ret = execve(file, (char **)exec_argv, envp);
         _exit(127);
diff --git a/third_party/quickjs/quickjs.c b/third_party/quickjs/quickjs.c
index bcec9cc48..1935e0cec 100644
--- a/third_party/quickjs/quickjs.c
+++ b/third_party/quickjs/quickjs.c
@@ -11296,11 +11296,11 @@ static char *i64toa(char *buf_end, int64_t n, unsigned int base)
 static void js_ecvt1(double d, int n_digits, int *decpt, int *sign, char *buf,
                      int rounding_mode, char *buf1, int buf1_size)
 {
-    /* if (rounding_mode != FE_TONEAREST) */
-    /*     fesetround(rounding_mode); */
+    if (rounding_mode != FE_TONEAREST)
+        fesetround(rounding_mode);
     snprintf(buf1, buf1_size, "%+.*e", n_digits - 1, d);
-    /* if (rounding_mode != FE_TONEAREST) */
-    /*     fesetround(FE_TONEAREST); */
+    if (rounding_mode != FE_TONEAREST)
+        fesetround(FE_TONEAREST);
     *sign = (buf1[0] == '-');
     /* mantissa */
     buf[0] = buf1[1];
@@ -53608,12 +53608,12 @@ static JSValue js_atomics_op(JSContext *ctx,
         a = func_name((_Atomic(uint32_t) *)ptr, v);     \
         break;
 #endif
-        /* OP(ADD, atomic_fetch_add) */
-        /* OP(AND, atomic_fetch_and) */
-        /* OP(OR, atomic_fetch_or) */
-        /* OP(SUB, atomic_fetch_sub) */
-        /* OP(XOR, atomic_fetch_xor) */
-        /* OP(EXCHANGE, atomic_exchange) */
+        OP(ADD, atomic_fetch_add)
+        OP(AND, atomic_fetch_and)
+        OP(OR, atomic_fetch_or)
+        OP(SUB, atomic_fetch_sub)
+        OP(XOR, atomic_fetch_xor)
+        OP(EXCHANGE, atomic_exchange)
 #undef OP
 
     case ATOMICS_OP_LOAD | (0 << 3):
diff --git a/third_party/quickjs/quickjs.mk b/third_party/quickjs/quickjs.mk
index 494e1d93f..f278b6eb5 100644
--- a/third_party/quickjs/quickjs.mk
+++ b/third_party/quickjs/quickjs.mk
@@ -3,83 +3,151 @@
 
 PKGS += THIRD_PARTY_QUICKJS
 
-THIRD_PARTY_QUICKJS_FILES := $(wildcard third_party/quickjs/*)
-THIRD_PARTY_QUICKJS_SRCS = $(filter %.c,$(THIRD_PARTY_QUICKJS_FILES))
-THIRD_PARTY_QUICKJS_HDRS = $(filter %.h,$(THIRD_PARTY_QUICKJS_FILES))
+THIRD_PARTY_QUICKJS_ARTIFACTS += THIRD_PARTY_QUICKJS_A
 THIRD_PARTY_QUICKJS_BINS = $(THIRD_PARTY_QUICKJS_COMS) $(THIRD_PARTY_QUICKJS_COMS:%=%.dbg)
-THIRD_PARTY_QUICKJS = $(THIRD_PARTY_QUICKJS_DEPS) $(THIRD_PARTY_QUICKJS_A)
+THIRD_PARTY_QUICKJS = $(THIRD_PARTY_QUICKJS_A_DEPS) $(THIRD_PARTY_QUICKJS_A)
 THIRD_PARTY_QUICKJS_A = o/$(MODE)/third_party/quickjs/quickjs.a
+THIRD_PARTY_QUICKJS_HDRS = $(foreach x,$(THIRD_PARTY_QUICKJS_ARTIFACTS),$($(x)_HDRS))
 
-THIRD_PARTY_QUICKJS_OBJS =				\
-	$(THIRD_PARTY_QUICKJS_SRCS:%.c=o/$(MODE)/%.o)
+THIRD_PARTY_QUICKJS_A_SRCS =					\
+	third_party/quickjs/cutils.c				\
+	third_party/quickjs/libbf.c				\
+	third_party/quickjs/libregexp.c				\
+	third_party/quickjs/libunicode.c			\
+	third_party/quickjs/quickjs-libc.c			\
+	third_party/quickjs/quickjs.c				\
+	third_party/quickjs/wut.c
 
-THIRD_PARTY_QUICKJS_COMS =				\
-	o/$(MODE)/third_party/quickjs/qjs.com
+THIRD_PARTY_QUICKJS_A_HDRS =					\
+	third_party/quickjs/cutils.h				\
+	third_party/quickjs/libbf.h				\
+	third_party/quickjs/libregexp.h				\
+	third_party/quickjs/libunicode.h			\
+	third_party/quickjs/list.h				\
+	third_party/quickjs/quickjs-libc.h			\
+	third_party/quickjs/quickjs.h
 
-THIRD_PARTY_QUICKJS_CHECKS =				\
-	$(THIRD_PARTY_QUICKJS_A).pkg			\
-	$(THIRD_PARTY_QUICKJS_HDRS:%=o/$(MODE)/%.ok)
+THIRD_PARTY_QUICKJS_A_OBJS =					\
+	o/$(MODE)/third_party/quickjs/cutils.o			\
+	o/$(MODE)/third_party/quickjs/libbf.o			\
+	o/$(MODE)/third_party/quickjs/libregexp.o		\
+	o/$(MODE)/third_party/quickjs/libunicode.o		\
+	o/$(MODE)/third_party/quickjs/quickjs-libc.o		\
+	o/$(MODE)/third_party/quickjs/quickjs.o			\
+	o/$(MODE)/third_party/quickjs/wut.o
 
-THIRD_PARTY_QUICKJS_DIRECTDEPS =			\
-	LIBC_ALG					\
-	LIBC_CALLS					\
-	LIBC_FMT					\
-	LIBC_INTRIN					\
-	LIBC_LOG					\
-	LIBC_MEM					\
-	LIBC_NEXGEN32E					\
-	LIBC_RUNTIME					\
-	LIBC_SOCK					\
-	LIBC_STDIO					\
-	LIBC_STR					\
-	LIBC_SYSV					\
-	LIBC_SYSV_CALLS					\
-	LIBC_TIME					\
-	LIBC_TINYMATH					\
-	LIBC_UNICODE					\
-	LIBC_X						\
-	THIRD_PARTY_COMPILER_RT				\
-	THIRD_PARTY_GDTOA				\
-	THIRD_PARTY_GETOPT				\
+THIRD_PARTY_QUICKJS_A_DIRECTDEPS =				\
+	LIBC_ALG						\
+	LIBC_CALLS						\
+	LIBC_FMT						\
+	LIBC_INTRIN						\
+	LIBC_LOG						\
+	LIBC_MEM						\
+	LIBC_NEXGEN32E						\
+	LIBC_RUNTIME						\
+	LIBC_SOCK						\
+	LIBC_STDIO						\
+	LIBC_STR						\
+	LIBC_SYSV						\
+	LIBC_SYSV_CALLS						\
+	LIBC_TIME						\
+	LIBC_TINYMATH						\
+	LIBC_UNICODE						\
+	LIBC_X							\
+	THIRD_PARTY_COMPILER_RT					\
+	THIRD_PARTY_GDTOA					\
+	THIRD_PARTY_GETOPT					\
 	THIRD_PARTY_MUSL
 
-THIRD_PARTY_QUICKJS_DEPS :=				\
-	$(call uniq,$(foreach x,$(THIRD_PARTY_QUICKJS_DIRECTDEPS),$($(x))))
+THIRD_PARTY_QUICKJS_A_DEPS :=					\
+	$(call uniq,$(foreach x,$(THIRD_PARTY_QUICKJS_A_DIRECTDEPS),$($(x))))
 
-$(THIRD_PARTY_QUICKJS_A):				\
-		third_party/quickjs/			\
-		$(THIRD_PARTY_QUICKJS_A).pkg		\
-		$(filter-out %/quickjs.c,$(THIRD_PARTY_QUICKJS_OBJS))
+$(THIRD_PARTY_QUICKJS_A):					\
+		third_party/quickjs/				\
+		$(THIRD_PARTY_QUICKJS_A).pkg			\
+		$(THIRD_PARTY_QUICKJS_A_OBJS)
 
-$(THIRD_PARTY_QUICKJS_A).pkg:				\
-		$(THIRD_PARTY_QUICKJS_OBJS)		\
-		$(foreach x,$(THIRD_PARTY_QUICKJS_DIRECTDEPS),$($(x)_A).pkg)
+$(THIRD_PARTY_QUICKJS_A).pkg:					\
+		$(THIRD_PARTY_QUICKJS_A_OBJS)			\
+		$(foreach x,$(THIRD_PARTY_QUICKJS_A_DIRECTDEPS),$($(x)_A).pkg)
 
-o/$(MODE)/third_party/quickjs/qjs.com.dbg:		\
-		$(THIRD_PARTY_QUICKJS_DEPS)		\
-		$(THIRD_PARTY_QUICKJS_A)		\
-		$(THIRD_PARTY_QUICKJS_A).pkg		\
-		o/$(MODE)/third_party/quickjs/qjs.o	\
-		$(CRT)					\
+THIRD_PARTY_QUICKJS_SRCS =					\
+	third_party/quickjs/qjs.c				\
+	third_party/quickjs/qjsc.c				\
+	third_party/quickjs/run-test262.c			\
+	$(foreach x,$(THIRD_PARTY_QUICKJS_ARTIFACTS),$($(x)_SRCS))
+
+THIRD_PARTY_QUICKJS_OBJS =					\
+	o/$(MODE)/third_party/quickjs/qjs.o			\
+	o/$(MODE)/third_party/quickjs/qjsc.o			\
+	o/$(MODE)/third_party/quickjs/run-test262.o		\
+	$(THIRD_PARTY_QUICKJS_A_OBJS)
+
+THIRD_PARTY_QUICKJS_COMS =					\
+	o/$(MODE)/third_party/quickjs/qjs.com			\
+	o/$(MODE)/third_party/quickjs/qjsc.com			\
+	o/$(MODE)/third_party/quickjs/run-test262.com		\
+	o/$(MODE)/third_party/quickjs/unicode_gen.com
+
+THIRD_PARTY_QUICKJS_CHECKS =					\
+	$(THIRD_PARTY_QUICKJS_A).pkg				\
+	$(THIRD_PARTY_QUICKJS_A_HDRS:%=o/$(MODE)/%.ok)
+
+o/$(MODE)/third_party/quickjs/qjs.com.dbg:			\
+		$(THIRD_PARTY_QUICKJS_A_DEPS)			\
+		$(THIRD_PARTY_QUICKJS_A)			\
+		$(THIRD_PARTY_QUICKJS_A).pkg			\
+		o/$(MODE)/third_party/quickjs/qjs.o		\
+		$(CRT)						\
 		$(APE)
 	-@$(APELINK)
 
-$(THIRD_PARTY_QUICKJS_OBJS):				\
-		OVERRIDE_CPPFLAGS +=			\
-			-DCONFIG_BIGNUM			\
+o/$(MODE)/third_party/quickjs/qjsc.com.dbg:			\
+		$(THIRD_PARTY_QUICKJS_A_DEPS)			\
+		$(THIRD_PARTY_QUICKJS_A)			\
+		$(THIRD_PARTY_QUICKJS_A).pkg			\
+		o/$(MODE)/third_party/quickjs/qjsc.o		\
+		$(CRT)						\
+		$(APE)
+	-@$(APELINK)
+
+# git clone git@github.com:tc39/test262 /opt/test262
+# make -j8 MODE=dbg o/dbg/third_party/quickjs/run-test262.com
+# o/dbg/third_party/quickjs/run-test262.com -m -c third_party/quickjs/test262.conf -a
+o/$(MODE)/third_party/quickjs/run-test262.com.dbg:		\
+		$(THIRD_PARTY_QUICKJS_A_DEPS)			\
+		$(THIRD_PARTY_QUICKJS_A)			\
+		$(THIRD_PARTY_QUICKJS_A).pkg			\
+		o/$(MODE)/third_party/quickjs/run-test262.o	\
+		$(CRT)						\
+		$(APE)
+	-@$(APELINK)
+
+o/$(MODE)/third_party/quickjs/unicode_gen.com.dbg:		\
+		$(THIRD_PARTY_QUICKJS_A_DEPS)			\
+		$(THIRD_PARTY_QUICKJS_A)			\
+		$(THIRD_PARTY_QUICKJS_A).pkg			\
+		o/$(MODE)/third_party/quickjs/unicode_gen.o	\
+		$(CRT)						\
+		$(APE)
+	-@$(APELINK)
+
+$(THIRD_PARTY_QUICKJS_OBJS):					\
+		OVERRIDE_CPPFLAGS +=				\
+			-DCONFIG_BIGNUM				\
 			-DCONFIG_VERSION=\"$(shell cat third_party/quickjs/VERSION)\"
 
-o/$(MODE)/third_party/quickjs/unicode_gen.o:		\
-		OVERRIDE_CPPFLAGS +=			\
+o/$(MODE)/third_party/quickjs/unicode_gen.o:			\
+		OVERRIDE_CPPFLAGS +=				\
 			-DSTACK_FRAME_UNLIMITED
 
 # TODO(jart): Replace alloca() calls with malloc().
-o/$(MODE)/third_party/quickjs/libregexp.o		\
-o/$(MODE)/third_party/quickjs/quickjs.o:		\
-		OVERRIDE_CPPFLAGS +=			\
+o/$(MODE)/third_party/quickjs/libregexp.o			\
+o/$(MODE)/third_party/quickjs/quickjs.o:			\
+		OVERRIDE_CPPFLAGS +=				\
 			-DSTACK_FRAME_UNLIMITED
 
 .PHONY: o/$(MODE)/third_party/quickjs
-o/$(MODE)/third_party/quickjs:				\
-		$(THIRD_PARTY_QUICKJS_BINS)		\
+o/$(MODE)/third_party/quickjs:					\
+		$(THIRD_PARTY_QUICKJS_BINS)			\
 		$(THIRD_PARTY_QUICKJS_CHECKS)
diff --git a/third_party/quickjs/run-test262.c b/third_party/quickjs/run-test262.c
index f69a28f48..756d43aa8 100644
--- a/third_party/quickjs/run-test262.c
+++ b/third_party/quickjs/run-test262.c
@@ -931,7 +931,8 @@ void load_config(const char *filename)
     if (!f) {
         perror_exit(1, filename);
     }
-    base_name = get_basename(filename);
+    /* base_name = get_basename(filename); */
+    base_name = strdup("");
     
     while (fgets(buf, sizeof(buf), f) != NULL) {
         char *p, *q;
@@ -1672,6 +1673,8 @@ int run_test(const char *filename, int index)
             if (p) {
                 snprintf(harnessbuf, sizeof(harnessbuf), "%.*s%s",
                          (int)(p - filename), filename, "test/harness");
+            } else {
+                strcpy(harnessbuf, ""); /* XXX */
             }
             harness = harnessbuf;
         }
@@ -1947,6 +1950,8 @@ int main(int argc, char **argv)
     BOOL is_test262_harness = FALSE;
     BOOL is_module = FALSE;
 
+    showcrashreports();
+
 #if !defined(_WIN32)
     /* Date tests assume California local time */
     setenv("TZ", "America/Los_Angeles", 1);
diff --git a/third_party/quickjs/test262.conf b/third_party/quickjs/test262.conf
index 6fbb5793a..0a181ef30 100644
--- a/third_party/quickjs/test262.conf
+++ b/third_party/quickjs/test262.conf
@@ -26,22 +26,22 @@ module=yes
 verbose=yes
 
 # load harness files from this directory
-harnessdir=test262/harness
+harnessdir=/opt/test262/harness
 
 # names of harness include files to skip
 #harnessexclude=
 
 # name of the error file for known errors
-errorfile=test262_errors.txt
+errorfile=third_party/quickjs/test262_errors.txt
 
 # exclude tests enumerated in this file (see also [exclude] section)
 #excludefile=test262_exclude.txt
 
 # report test results to this file
-reportfile=test262_report.txt
+reportfile=o/test262_report.txt
 
 # enumerate tests from this directory
-testdir=test262/test
+testdir=/opt/test262/test
 
 [features]
 # Standard language features and proposed extensions
@@ -184,16 +184,19 @@ __setter__
 # list excluded tests and directories here
 
 # intl not supported
-test262/test/intl402/
+/opt/test262/test/intl402/
 
 # incompatible with the "caller" feature
-test262/test/built-ins/Function/prototype/restricted-property-caller.js
-test262/test/built-ins/Function/prototype/restricted-property-arguments.js
-test262/test/built-ins/ThrowTypeError/unique-per-realm-function-proto.js
+/opt/test262/test/built-ins/Function/prototype/restricted-property-caller.js
+/opt/test262/test/built-ins/Function/prototype/restricted-property-arguments.js
+/opt/test262/test/built-ins/ThrowTypeError/unique-per-realm-function-proto.js
 
 # slow tests
-#test262/test/built-ins/RegExp/CharacterClassEscapes/
-#test262/test/built-ins/RegExp/property-escapes/
+#/opt/test262/test/built-ins/RegExp/CharacterClassEscapes/
+#/opt/test262/test/built-ins/RegExp/property-escapes/
+
+# No threads in Cosmopolitan ATM
+/opt/test262/test/built-ins/Atomics/
 
 [tests]
 # list test files or use config.testdir
diff --git a/tool/build/compile.c b/tool/build/compile.c
index 647396df4..b52435c5f 100644
--- a/tool/build/compile.c
+++ b/tool/build/compile.c
@@ -421,6 +421,11 @@ int main(int argc, char *argv[]) {
     } else if (isclang && startswith(argv[i], "--debug-prefix-map")) {
       /* llvm doesn't provide a gas interface so simulate w/ clang */
       AddArg(xasprintf("-f%s", argv[i] + 2));
+    } else if (isgcc && (!strcmp(argv[i], "-Os") || !strcmp(argv[i], "-O2") ||
+                         !strcmp(argv[i], "-O3"))) {
+      /* https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97623 */
+      AddArg(argv[i]);
+      AddArg("-fno-code-hoisting");
     } else {
       AddArg(argv[i]);
     }