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target-ppc: Use movcond in isel 

Signed-off-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Richard Henderson 2016-02-23 17:18:34 -08:00 committed by David Gibson
parent 319de6fe6e
commit 24f9cd951d
1 changed files with 11 additions and 18 deletions
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29
target-ppc/translate.c
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@ -756,27 +756,20 @@ static void gen_cmpli(DisasContext *ctx)
/* isel (PowerPC 2.03 specification) */
static void gen_isel(DisasContext *ctx)
{
TCGLabel *l1, *l2;
uint32_t bi = rC(ctx->opcode);
uint32_t mask;
TCGv_i32 t0;
uint32_t mask = 0x08 >> (bi & 0x03);
TCGv t0 = tcg_temp_new();
TCGv zr;
l1 = gen_new_label();
l2 = gen_new_label();
tcg_gen_extu_i32_tl(t0, cpu_crf[bi >> 2]);
tcg_gen_andi_tl(t0, t0, mask);
mask = 0x08 >> (bi & 0x03);
t0 = tcg_temp_new_i32();
tcg_gen_andi_i32(t0, cpu_crf[bi >> 2], mask);
tcg_gen_brcondi_i32(TCG_COND_EQ, t0, 0, l1);
if (rA(ctx->opcode) == 0)
tcg_gen_movi_tl(cpu_gpr[rD(ctx->opcode)], 0);
else
tcg_gen_mov_tl(cpu_gpr[rD(ctx->opcode)], cpu_gpr[rA(ctx->opcode)]);
tcg_gen_br(l2);
gen_set_label(l1);
tcg_gen_mov_tl(cpu_gpr[rD(ctx->opcode)], cpu_gpr[rB(ctx->opcode)]);
gen_set_label(l2);
tcg_temp_free_i32(t0);
zr = tcg_const_tl(0);
tcg_gen_movcond_tl(TCG_COND_NE, cpu_gpr[rD(ctx->opcode)], t0, zr,
rA(ctx->opcode) ? cpu_gpr[rA(ctx->opcode)] : zr,
cpu_gpr[rB(ctx->opcode)]);
tcg_temp_free(zr);
tcg_temp_free(t0);
}
/* cmpb: PowerPC 2.05 specification */