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Make improvements

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- Introduce portable sched_getcpu() api
- Support GCC's __target_clones__ feature
- Make fma() go faster on x86 in default mode
- Remove some asan checks from core libraries
- WinMain() now ensures $HOME and $USER are defined
This commit is contained in:
Justine Tunney 2024-02-01 03:39:46 -08:00
parent d5225a693b
commit 2ab9e9f7fd
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GPG key ID: BE714B4575D6E328
192 changed files with 2809 additions and 932 deletions
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10
libc/runtime/getargmax.c
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@ -19,6 +19,8 @@
#include "libc/dce.h"
#include "libc/macros.internal.h"
#include "libc/runtime/runtime.h"
#include "libc/stdio/sysparam.h"
#include "libc/sysv/consts/_posix.h"
#include "libc/sysv/consts/limits.h"
#include "libc/sysv/consts/rlimit.h"
@ -29,6 +31,7 @@
* Returns expensive but more correct version of `ARG_MAX`.
*/
int __get_arg_max(void) {
int res;
if (IsLinux()) {
// You might think that just returning a constant 128KiB (ARG_MAX)
// would make sense, as this guy did:
@ -57,10 +60,11 @@ int __get_arg_max(void) {
// does. Right now (2019, Linux 5.3) that amounts to:
uint64_t stacksz;
stacksz = __get_rlimit(RLIMIT_STACK);
return MAX(MIN(stacksz / 4, 3 * (8 * 1024 * 1024) / 4), _ARG_MAX);
res = MAX(MIN(stacksz / 4, 3 * (8 * 1024 * 1024) / 4), _ARG_MAX);
} else if (IsBsd()) {
return __get_sysctl(CTL_KERN, KERN_ARGMAX);
res = __get_sysctl(CTL_KERN, KERN_ARGMAX);
} else {
return _ARG_MAX;
res = _ARG_MAX;
}
return MAX(res, _POSIX_ARG_MAX);
}