Commit 6fb58745 authored by Richard Henderson's avatar Richard Henderson
Browse files

tcg-i386: Make use of zero-extended memory helper routines 



For 8 and 16-bit unsigned loads, rely on the zero-extension
from the helper and use a smaller 32-bit move insn.

Reviewed-by: default avatarAurelien Jarno <aurelien@aurel32.net>
Signed-off-by: default avatarRichard Henderson <rth@twiddle.net>
parent c8f94df5

tcg/i386/tcg-target.c

+6 −9
Original line number Diff line number Diff line
@@ -1531,20 +1531,17 @@ static void tcg_out_qemu_ld_slow_path(TCGContext *s, TCGLabelQemuLdst *l) 
    case 1 | 4:

        tcg_out_ext16s(s, data_reg, TCG_REG_EAX, P_REXW);

        break;

    case 0:

        tcg_out_ext8u(s, data_reg, TCG_REG_EAX);

        break;

    case 1:

        tcg_out_ext16u(s, data_reg, TCG_REG_EAX);

        break;

    case 2:

        tcg_out_mov(s, TCG_TYPE_I32, data_reg, TCG_REG_EAX);

        break;

#if TCG_TARGET_REG_BITS == 64

    case 2 | 4:

        tcg_out_ext32s(s, data_reg, TCG_REG_EAX);

        break;

#endif

    case 0:

    case 1:

        /* Note that the helpers have zero-extended to tcg_target_long.  */

    case 2:

        tcg_out_mov(s, TCG_TYPE_I32, data_reg, TCG_REG_EAX);

        break;

    case 3:

        if (TCG_TARGET_REG_BITS == 64) {

            tcg_out_mov(s, TCG_TYPE_I64, data_reg, TCG_REG_RAX);