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Use __builtin_ctzg and __builtin_clzg in the implementations of

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CountTrailingZeroesNonzero16 and CountLeadingZeroes16 when they are
available.

GCC 14 and Clang 19 adds these new builtins. The g-suffix is for
"generic". The s-suffix on __builtin_ctzs and __builtin_clzs is for
"short". GCC never implemented the short versions and #1664 reports
GCC 14 (pre-release) gives an error here, although this may be a
pre-release bug.

Fixes #1664

PiperOrigin-RevId: 630408249
Change-Id: I4aedcc82b85430f50d025f8eb1cab089c6fcd1bc
This commit is contained in:
Derek Mauro
2024-05-03 09:14:22 -07:00
committed by Copybara-Service
parent 7e149e40c7
commit c1e1b47d98
1 changed files with 6 additions and 2 deletions
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8
absl/numeric/internal/bits.h
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@@ -167,7 +167,9 @@ CountLeadingZeroes32(uint32_t x) {
ABSL_ATTRIBUTE_ALWAYS_INLINE ABSL_INTERNAL_CONSTEXPR_CLZ inline int
CountLeadingZeroes16(uint16_t x) {
#if ABSL_HAVE_BUILTIN(__builtin_clzs)
#if ABSL_HAVE_BUILTIN(__builtin_clzg)
return x == 0 ? 16 : __builtin_clzg(x);
#elif ABSL_HAVE_BUILTIN(__builtin_clzs)
static_assert(sizeof(unsigned short) == sizeof(x), // NOLINT(runtime/int)
"__builtin_clzs does not take 16-bit arg");
return x == 0 ? 16 : __builtin_clzs(x);
@@ -303,7 +305,9 @@ CountTrailingZeroesNonzero64(uint64_t x) {
ABSL_ATTRIBUTE_ALWAYS_INLINE ABSL_INTERNAL_CONSTEXPR_CTZ inline int
CountTrailingZeroesNonzero16(uint16_t x) {
#if ABSL_HAVE_BUILTIN(__builtin_ctzs)
#if ABSL_HAVE_BUILTIN(__builtin_ctzg)
return __builtin_ctzg(x);
#elif ABSL_HAVE_BUILTIN(__builtin_ctzs)
static_assert(sizeof(unsigned short) == sizeof(x), // NOLINT(runtime/int)
"__builtin_ctzs does not take 16-bit arg");
return __builtin_ctzs(x);