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add zbb check macro

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anthony-zy
2025-11-10 10:37:19 +08:00
parent e92cb6ae8a
commit 727f5b3fc6
1 changed files with 8 additions and 2 deletions
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10
snappy-stubs-internal.h
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@@ -304,7 +304,10 @@ class Bits {
void operator=(const Bits&); void operator=(const Bits&);
}; };
#if HAVE_BUILTIN_CTZ // Check if the built-in __builtin_ctz (count trailing zeros) is available.
// Require either a non-RISC-V target, or a RISC-V core that implements
// the Zbb bit-manipulation extension where ctz is guaranteed.
#if HAVE_BUILTIN_CTZ && (!defined(__riscv) || defined(__riscv_zbb))
inline int Bits::Log2FloorNonZero(uint32_t n) { inline int Bits::Log2FloorNonZero(uint32_t n) {
assert(n != 0); assert(n != 0);
@@ -393,7 +396,10 @@ inline int Bits::FindLSBSetNonZero(uint32_t n) {
#endif // End portable versions. #endif // End portable versions.
#if HAVE_BUILTIN_CTZ // Check if the built-in __builtin_ctz (count trailing zeros) is available.
// Require either a non-RISC-V target, or a RISC-V core that implements
// the Zbb bit-manipulation extension where ctz is guaranteed.
#if HAVE_BUILTIN_CTZ && (!defined(__riscv) || defined(__riscv_zbb))
inline int Bits::FindLSBSetNonZero64(uint64_t n) { inline int Bits::FindLSBSetNonZero64(uint64_t n) {
assert(n != 0); assert(n != 0);