Commit 3601ff11 authored by David Gibson's avatar David Gibson Committed by Alexander Graf
Browse files

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: default avatarDavid Gibson <david@gibson.dropbear.id.au>
Signed-off-by: default avatarAlexander Graf <agraf@suse.de>
parent a3467baa

target-ppc/op_helper.c

+1 −13
Original line number Diff line number Diff line
@@ -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)