The recent patches adding partial support for POWER7 cpu emulation included
implementing the popcntd instruction. The support for this was open coded,
but host-utils.h already included a function implementing an equivalent
population count function, which uses a gcc builtin (which can use special
host instructions) if available.
This patch makes the popcntd implementation use the existing, potentially
faster, implementation.
Signed-off-by: David Gibson <da...@gibson.dropbear.id.au>
---
target-ppc/op_helper.c | 14 +-------------
1 files changed, 1 insertions(+), 13 deletions(-)
diff --git a/target-ppc/op_helper.c b/target-ppc/op_helper.c
index b1b883d..5882bec 100644
--- a/target-ppc/op_helper.c
+++ b/target-ppc/op_helper.c
@@ -528,19 +528,7 @@ target_ulong helper_popcntw (target_ulong val)
target_ulong helper_popcntd (target_ulong val)
{
- val = (val & 0x5555555555555555ULL) + ((val >> 1) &
- 0x5555555555555555ULL);
- val = (val & 0x3333333333333333ULL) + ((val >> 2) &
- 0x3333333333333333ULL);
- val = (val & 0x0f0f0f0f0f0f0f0fULL) + ((val >> 4) &
- 0x0f0f0f0f0f0f0f0fULL);
- val = (val & 0x00ff00ff00ff00ffULL) + ((val >> 8) &
- 0x00ff00ff00ff00ffULL);
- val = (val & 0x0000ffff0000ffffULL) + ((val >> 16) &
- 0x0000ffff0000ffffULL);
- val = (val & 0x00000000ffffffffULL) + ((val >> 32) &
- 0x00000000ffffffffULL);
- return val;
+ return ctpop64(val);
}
#else
target_ulong helper_popcntb (target_ulong val)
--
1.7.1
