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[util] Implement tzcnt for non-x86 platforms

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Joshua Ashton 2022-09-13 18:42:14 +01:00 committed by Joshie
parent 466026632d
commit c3093b546e
1 changed files with 8 additions and 4 deletions
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12
src/util/util_bit.h
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@ -68,7 +68,7 @@ namespace dxvk::bit {
return _tzcnt_u32(n);
#elif defined(__BMI__)
return __tzcnt_u32(n);
#elif defined(__GNUC__) || defined(__clang__)
#elif defined(DXVK_ARCH_X86) && (defined(__GNUC__) || defined(__clang__))
// tzcnt is encoded as rep bsf, so we can use it on all
// processors, but the behaviour of zero inputs differs:
// - bsf: zf = 1, cf = ?, result = ?
@ -85,6 +85,8 @@ namespace dxvk::bit {
: "r" (n)
: "cc");
return res;
#elif defined(__GNUC__) || defined(__clang__)
return n != 0 ? __builtin_ctz(n) : 32;
#else
uint32_t r = 31;
n &= -n;
@ -98,11 +100,11 @@ namespace dxvk::bit {
}
inline uint32_t tzcnt(uint64_t n) {
#if defined(_M_X64) && defined(_MSC_VER) && !defined(__clang__)
#if defined(DXVK_ARCH_X86_64) && defined(_MSC_VER) && !defined(__clang__)
return _tzcnt_u64(n);
#elif defined(__x86_64__) && defined(__BMI__)
#elif defined(DXVK_ARCH_X86_64) && defined(__BMI__)
return __tzcnt_u64(n);
#elif defined(__x86_64__) && defined(__GNUC__) || defined(__clang__)
#elif defined(DXVK_ARCH_X86_64) && defined(__GNUC__) || defined(__clang__)
uint64_t res;
uint64_t tmp;
asm (
@ -114,6 +116,8 @@ namespace dxvk::bit {
: "r" (n)
: "cc");
return res;
#elif defined(__GNUC__) || defined(__clang__)
return n != 0 ? __builtin_ctzll(n) : 64;
#else
uint32_t lo = uint32_t(n);
if (lo) {