microblaze: Improve src
Microblaze carry is mirrored in MSR[31], pick it directly from there. Also, no need to mask cpu_R[dc->ra] when calling write_carry. 15% improvement in linux-user src loops. Signed-off-by: Edgar E. Iglesias <edgar.iglesias@gmail.com>
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@ -750,7 +750,7 @@ static void dec_barrel(DisasContext *dc)
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static void dec_bit(DisasContext *dc)
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static void dec_bit(DisasContext *dc)
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{
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{
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TCGv t0, t1;
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TCGv t0;
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unsigned int op;
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unsigned int op;
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int mem_index = cpu_mmu_index(dc->env);
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int mem_index = cpu_mmu_index(dc->env);
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@ -761,19 +761,12 @@ static void dec_bit(DisasContext *dc)
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t0 = tcg_temp_new();
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t0 = tcg_temp_new();
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LOG_DIS("src r%d r%d\n", dc->rd, dc->ra);
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LOG_DIS("src r%d r%d\n", dc->rd, dc->ra);
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tcg_gen_andi_tl(t0, cpu_R[dc->ra], 1);
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tcg_gen_andi_tl(t0, cpu_SR[SR_MSR], MSR_CC);
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write_carry(dc, cpu_R[dc->ra]);
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if (dc->rd) {
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if (dc->rd) {
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t1 = tcg_temp_new();
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read_carry(dc, t1);
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tcg_gen_shli_tl(t1, t1, 31);
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tcg_gen_shri_tl(cpu_R[dc->rd], cpu_R[dc->ra], 1);
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tcg_gen_shri_tl(cpu_R[dc->rd], cpu_R[dc->ra], 1);
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tcg_gen_or_tl(cpu_R[dc->rd], cpu_R[dc->rd], t1);
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tcg_gen_or_tl(cpu_R[dc->rd], cpu_R[dc->rd], t0);
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tcg_temp_free(t1);
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}
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}
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/* Update carry. */
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write_carry(dc, t0);
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tcg_temp_free(t0);
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tcg_temp_free(t0);
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break;
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break;
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