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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: Tom Musta <tommusta@gmail.com>
Suggested-by: Richard Henderson <rth@twiddle.net>
Reviewed-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Tom Musta 2014-08-25 14:25:40 -05:00 committed by Alexander Graf
parent ab92678d0a
commit 8979c2f602
1 changed files with 6 additions and 0 deletions
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6
target-ppc/translate.c
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@ -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)