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Remove unneeded code at preproc stage

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If we know we have BMI2 we shouldn't produce the fallback code.
This commit is contained in:
Matthew Barr
2015-10-30 10:43:43 +11:00
parent aafbd96a1d
commit 1f47b82106
2 changed files with 12 additions and 6 deletions
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12
src/util/bitutils.h
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@@ -254,7 +254,7 @@ u32 compress32(u32 x, u32 m) {
#if defined(__BMI2__)
// BMI2 has a single instruction for this operation.
return _pext_u32(x, m);
#endif
#else
// Return zero quickly on trivial cases
if ((x & m) == 0) {
@@ -281,6 +281,7 @@ u32 compress32(u32 x, u32 m) {
}
return x;
#endif
}
static really_inline
@@ -288,7 +289,7 @@ u64a compress64(u64a x, u64a m) {
#if defined(ARCH_X86_64) && defined(__BMI2__)
// BMI2 has a single instruction for this operation.
return _pext_u64(x, m);
#endif
#else
// Return zero quickly on trivial cases
if ((x & m) == 0) {
@@ -316,6 +317,7 @@ u64a compress64(u64a x, u64a m) {
}
return x;
#endif
}
static really_inline
@@ -323,7 +325,7 @@ u32 expand32(u32 x, u32 m) {
#if defined(__BMI2__)
// BMI2 has a single instruction for this operation.
return _pdep_u32(x, m);
#endif
#else
// Return zero quickly on trivial cases
if (!x || !m) {
@@ -355,6 +357,7 @@ u32 expand32(u32 x, u32 m) {
}
return x & m0; // clear out extraneous bits
#endif
}
static really_inline
@@ -362,7 +365,7 @@ u64a expand64(u64a x, u64a m) {
#if defined(ARCH_X86_64) && defined(__BMI2__)
// BMI2 has a single instruction for this operation.
return _pdep_u64(x, m);
#endif
#else
// Return zero quickly on trivial cases
if (!x || !m) {
@@ -395,6 +398,7 @@ u64a expand64(u64a x, u64a m) {
}
return x & m0; // clear out extraneous bits
#endif
}