mirrors/cosmopolitan
1
0
Fork 0
mirror of https://github.com/jart/cosmopolitan.git synced 2025-05-31 09:42:27 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions 1

Make AARCH64 harder, better, faster, stronger

Browse source 
- Perform some housekeeping on scalar math function code
- Import ARM's Optimized Routines for SIMD string processing
- Upgrade to latest Chromium zlib and enable more SIMD optimizations
This commit is contained in:
Justine Tunney 2023-05-15 01:51:29 -07:00
parent 550b52abf6
commit cc1732bc42
No known key found for this signature in database
GPG key ID: BE714B4575D6E328
143 changed files with 15661 additions and 1329 deletions
Download patch file Download diff file Expand all files Collapse all files

25
test/libc/intrin/memcmp_test.c
View file

@ -61,6 +61,17 @@ TEST(memcmp, hug) {
}
}
static int coerce(int result) {
#ifdef __aarch64__
// arm's strcmp assembly is nuts and unpredictable, but it's legal
if (result < 0) return -1;
if (result > 0) return +1;
return 0;
#else
return result;
#endif
}
TEST(memcmp, fuzz) {
int i, o, n, g;
char a[256], b[256];
@ -79,8 +90,18 @@ TEST(memcmp, fuzz) {
}
o = rand() & 31;
n = rand() % (sizeof(a) - o);
g = golden(a + o, b + o, n);
ASSERT_EQ(g, memcmp(a + o, b + o, n), "n=%d o=%d", n, o);
g = coerce(golden(a + o, b + o, n));
#if 0
if (memcmp(a + o, b + o, n) != g) {
kprintf("const size_t g = %d;\n", g);
kprintf("const size_t n = %d;\n", n);
kprintf("const char a[] = unbingstr(%#.*hhhs); /* %p */\n", n, a + o,
a + o);
kprintf("const char b[] = unbingstr(%#.*hhhs); /* %p */\n", n, b + o,
b + o);
}
#endif
ASSERT_EQ(g, coerce(memcmp(a + o, b + o, n)), "n=%d o=%d", n, o);
ASSERT_EQ(!!g, !!bcmp(a + o, b + o, n), "n=%d o=%d", n, o);
ASSERT_EQ(!!g, !!timingsafe_bcmp(a + o, b + o, n), "n=%d o=%d", n, o);
ASSERT_EQ(MAX(-1, MIN(1, g)), timingsafe_memcmp(a + o, b + o, n),