From 3601ff11732160e42d3174d2821d873cfcd52a59 Mon Sep 17 00:00:00 2001 From: David Gibson Date: Tue, 5 Apr 2011 15:12:11 +1000 Subject: [PATCH] Use existing helper function to implement popcntd instruction 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 Signed-off-by: Alexander Graf --- target-ppc/op_helper.c | 14 +------------- 1 file changed, 1 insertion(+), 13 deletions(-) diff --git a/target-ppc/op_helper.c b/target-ppc/op_helper.c index b1b883d0a7..5882becbc9 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) -- 2.11.4.GIT