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target-xtensa: Use clrsb helper

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Signed-off-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
Richard Henderson 2016-11-16 17:38:10 +01:00
parent 16256947eb
commit 3946c6aa3d
1 changed files with 1 additions and 10 deletions
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11
target/xtensa/translate.c
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@ -1372,16 +1372,7 @@ static void disas_xtensa_insn(CPUXtensaState *env, DisasContext *dc)
case 14: /*NSAu*/
HAS_OPTION(XTENSA_OPTION_MISC_OP_NSA);
if (gen_window_check2(dc, RRR_S, RRR_T)) {
TCGv_i32 t0 = tcg_temp_new_i32();
/* if (v & 0x80000000) v = ~v; */
tcg_gen_sari_i32(t0, cpu_R[RRR_S], 31);
tcg_gen_xor_i32(t0, t0, cpu_R[RRR_S]);
/* r = (v ? clz(v) : 32) - 1; */
tcg_gen_clzi_i32(t0, t0, 32);
tcg_gen_subi_i32(cpu_R[RRR_T], t0, 1);
tcg_temp_free_i32(t0);
tcg_gen_clrsb_i32(cpu_R[RRR_T], cpu_R[RRR_S]);
}
break;