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move andn helper function to bitutils.h

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This commit is contained in:
Konstantinos Margaritis
2020-09-22 12:17:27 +03:00
parent 6581aae90e
commit 9f3ad89ed6
4 changed files with 32 additions and 14 deletions
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9
src/util/arch/common/bitutils.h
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@@ -34,6 +34,7 @@
#define BITUTILS_ARCH_COMMON_H
#include "util/popcount.h"
#include "util/unaligned.h"
static really_inline
u32 clz32_impl_c(u32 x) {
@@ -350,4 +351,12 @@ u64a pext64_impl_c(u64a x, u64a mask) {
return result;
}
/* compilers don't reliably synthesize the 32-bit ANDN instruction here,
* so we force its generation.
*/
static really_inline
u64a andn_impl_c(const u32 a, const u8 *b) {
return unaligned_load_u32(b) & ~a;
}
#endif // BITUTILS_ARCH_COMMON_H

14
src/util/arch/x86/bitutils.h
View File

@@ -301,4 +301,18 @@ u64a pdep64(u64a x, u64a mask) {
}
#endif
/* compilers don't reliably synthesize the 32-bit ANDN instruction here,
* so we force its generation.
*/
static really_inline
u64a andn_impl(const u32 a, const u8 *b) {
#if defined(HAVE_BMI) && !defined(NO_ASM)
u64a r;
__asm__ ("andn\t%2,%1,%k0" : "=r"(r) : "r"(a), "m"(*(const u32 *)b));
return r;
#else
return andn_impl_c(a, b);
#endif
}
#endif // BITUTILS_ARCH_X86_H