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Use existing helper function to implement popcntd instruction

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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 <david@gibson.dropbear.id.au>
Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
David Gibson 2011-04-05 15:12:11 +10:00 committed by Alexander Graf
parent a3467baa88
commit 3601ff1173
1 changed files with 1 additions and 13 deletions
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14
target-ppc/op_helper.c
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@ -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)