diff options
Diffstat (limited to 'libsanitizer/sanitizer_common/sanitizer_libc.cc')
| -rw-r--r-- | libsanitizer/sanitizer_common/sanitizer_libc.cc | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/libsanitizer/sanitizer_common/sanitizer_libc.cc b/libsanitizer/sanitizer_common/sanitizer_libc.cc index 2a75e431b31..53c87555092 100644 --- a/libsanitizer/sanitizer_common/sanitizer_libc.cc +++ b/libsanitizer/sanitizer_common/sanitizer_libc.cc @@ -14,6 +14,16 @@ namespace __sanitizer { +// Make the compiler think that something is going on there. +static inline void break_optimization(void *arg) { +#if SANITIZER_WINDOWS + // FIXME: make sure this is actually enough. + __asm; +#else + __asm__ __volatile__("" : : "r" (arg) : "memory"); +#endif +} + s64 internal_atoll(const char *nptr) { return internal_simple_strtoll(nptr, (char**)0, 10); } @@ -60,6 +70,16 @@ void *internal_memmove(void *dest, const void *src, uptr n) { return dest; } +// Semi-fast bzero for 16-aligned data. Still far from peak performance. +void internal_bzero_aligned16(void *s, uptr n) { + struct S16 { u64 a, b; } ALIGNED(16); + CHECK_EQ((reinterpret_cast<uptr>(s) | n) & 15, 0); + for (S16 *p = reinterpret_cast<S16*>(s), *end = p + n / 16; p < end; p++) { + p->a = p->b = 0; + break_optimization(0); // Make sure this does not become memset. + } +} + void *internal_memset(void* s, int c, uptr n) { // The next line prevents Clang from making a call to memset() instead of the // loop below. |