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add bsf/bsr for compilation with older compilers (clang 7)

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daanx 2024-12-09 20:06:48 -08:00
parent 56a1bd7f9e
commit e44815ed6f
1 changed files with 16 additions and 6 deletions
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22
include/mimalloc/bits.h
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@ -153,9 +153,9 @@ size_t _mi_clz_generic(size_t x);
size_t _mi_ctz_generic(size_t x);
static inline size_t mi_ctz(size_t x) {
#if defined(__GNUC__) && MI_ARCH_X64 && defined(__BMI1__) // on x64 tzcnt is defined for 0
uint64_t r;
__asm ("tzcnt\t%1, %0" : "=&r"(r) : "r"(x) : "cc");
#if defined(__GNUC__) && MI_ARCH_X64 && defined(__BMI1__) // on x64 tzcnt is defined for 0
size_t r;
__asm ("tzcnt\t%1, %0" : "=r"(r) : "r"(x) : "cc");
return r;
#elif MI_ARCH_X64 && defined(__BMI1__)
return (size_t)_tzcnt_u64(x);
@ -164,6 +164,11 @@ static inline size_t mi_ctz(size_t x) {
return (mi_msc_builtinz(_BitScanForward)(&idx, x) ? (size_t)idx : MI_SIZE_BITS);
#elif mi_has_builtinz(ctz)
return (x!=0 ? (size_t)mi_builtinz(ctz)(x) : MI_SIZE_BITS);
#elif defined(__GNUC__) && (MI_ARCH_X64 || MI_ARCH_X86)
if (x==0) return MI_SIZE_BITS;
size_t r;
__asm ("bsf\t%1, %0" : "=r"(r) : "r"(x) : "cc");
return r;
#else
#define MI_HAS_FAST_BITSCAN 0
return (x!=0 ? _mi_ctz_generic(x) : MI_SIZE_BITS);
@ -172,9 +177,9 @@ static inline size_t mi_ctz(size_t x) {
static inline size_t mi_clz(size_t x) {
#if defined(__GNUC__) && MI_ARCH_X64 && defined(__BMI1__) // on x64 lzcnt is defined for 0
uint64_t r;
__asm ("lzcnt\t%1, %0" : "=&r"(r) : "r"(x) : "cc");
return r;
size_t r;
__asm ("lzcnt\t%1, %0" : "=r"(r) : "r"(x) : "cc");
return r;
#elif MI_ARCH_X64 && defined(__BMI1__)
return (size_t)_lzcnt_u64(x);
#elif defined(_MSC_VER) && (MI_ARCH_X64 || MI_ARCH_X86 || MI_ARCH_ARM64 || MI_ARCH_ARM32)
@ -182,6 +187,11 @@ static inline size_t mi_clz(size_t x) {
return (mi_msc_builtinz(_BitScanReverse)(&idx, x) ? MI_SIZE_BITS - 1 - (size_t)idx : MI_SIZE_BITS);
#elif mi_has_builtinz(clz)
return (x!=0 ? (size_t)mi_builtinz(clz)(x) : MI_SIZE_BITS);
#elif defined(__GNUC__) && (MI_ARCH_X64 || MI_ARCH_X86)
if (x==0) return MI_SIZE_BITS;
size_t r;
__asm ("bsr\t%1, %0" : "=r"(r) : "r"(x) : "cc");
return (MI_SIZE_BITS - 1 - r);
#else
#define MI_HAS_FAST_BITSCAN 0
return (x!=0 ? _mi_clz_generic(x) : MI_SIZE_BITS);