Commit 39f099ec authored by Richard Henderson's avatar Richard Henderson
Browse files

tcg/i386: Always use TZCNT when available 



I think this is cleaner than sometimes using BSF.

Signed-off-by: default avatarRichard Henderson <rth@twiddle.net>
parent 9bf38308

tcg/i386/tcg-target.inc.c

+7 −3
Original line number Diff line number Diff line
@@ -1143,10 +1143,14 @@ static void tcg_out_movcond64(TCGContext *s, TCGCond cond, TCGReg dest, 
static void tcg_out_ctz(TCGContext *s, int rexw, TCGReg dest, TCGReg arg1,

                        TCGArg arg2, bool const_a2)

{

    if (have_bmi1) {

        tcg_out_modrm(s, OPC_TZCNT + rexw, dest, arg1);

        if (const_a2) {

        tcg_debug_assert(have_bmi1);

            tcg_debug_assert(arg2 == (rexw ? 64 : 32));

        tcg_out_modrm(s, OPC_TZCNT + rexw, dest, arg1);

        } else {

            tcg_debug_assert(dest != arg2);

            tcg_out_cmov(s, TCG_COND_LTU, rexw, dest, arg2);

        }

    } else {

        tcg_debug_assert(dest != arg2);

        tcg_out_modrm(s, OPC_BSF + rexw, dest, arg1);