Commit 8979c2f6 authored by Tom Musta's avatar Tom Musta Committed by Alexander Graf
Browse files

target-ppc: Optimize rlwinm MB=0 ME=31 



Optimize the special case of rlwinm where MB=0 and ME=31.  This can
be implemented as a 32-bit ROTL.

Signed-off-by: default avatarTom Musta <tommusta@gmail.com>
Suggested-by: default avatarRichard Henderson <rth@twiddle.net>
Reviewed-by: default avatarRichard Henderson <rth@twiddle.net>
Signed-off-by: default avatarAlexander Graf <agraf@suse.de>
parent ab92678d

target-ppc/translate.c

+6 −0
Original line number Diff line number Diff line
@@ -1691,6 +1691,12 @@ static void gen_rlwinm(DisasContext *ctx) 
        tcg_gen_shri_tl(t0, t0, mb);

        tcg_gen_ext32u_tl(cpu_gpr[rA(ctx->opcode)], t0);

        tcg_temp_free(t0);

    } else if (likely(mb == 0 && me == 31)) {

        TCGv_i32 t0 = tcg_temp_new_i32();

        tcg_gen_trunc_tl_i32(t0, cpu_gpr[rS(ctx->opcode)]);

        tcg_gen_rotli_i32(t0, t0, sh);

        tcg_gen_extu_i32_tl(cpu_gpr[rA(ctx->opcode)], t0);

        tcg_temp_free_i32(t0);

    } else {

        TCGv t0 = tcg_temp_new();

#if defined(TARGET_PPC64)