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target-ppc: optimize popcntb 

Suggested by Andrzej Zaborowski.

Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5592 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
aurel32 2008-11-01 00:54:33 +00:00
parent 182608d44c
commit 6176a26d1d
1 changed files with 8 additions and 14 deletions
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22
target-ppc/op_helper.c
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@ -222,25 +222,19 @@ target_ulong helper_srad (target_ulong value, target_ulong shift)
target_ulong helper_popcntb (target_ulong val)
{
uint32_t ret;
int i;
ret = 0;
for (i = 0; i < 32; i += 8)
ret |= ctpop8((val >> i) & 0xFF) << i;
return ret;
val = (val & 0x55555555) + ((val >> 1) & 0x55555555);
val = (val & 0x33333333) + ((val >> 2) & 0x33333333);
val = (val & 0x0f0f0f0f) + ((val >> 4) & 0x0f0f0f0f);
return val;
}
#if defined(TARGET_PPC64)
target_ulong helper_popcntb_64 (target_ulong val)
{
uint64_t ret;
int i;
ret = 0;
for (i = 0; i < 64; i += 8)
ret |= ctpop8((val >> i) & 0xFF) << i;
return ret;
val = (val & 0x5555555555555555ULL) + ((val >> 1) & 0x5555555555555555ULL);
val = (val & 0x3333333333333333ULL) + ((val >> 2) & 0x3333333333333333ULL);
val = (val & 0x0f0f0f0f0f0f0f0fULL) + ((val >> 4) & 0x0f0f0f0f0f0f0f0fULL);
return val;
}
#endif