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

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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: Aurelien Jarno <aurelien@aurel32.net>
Signed-off-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
Richard Henderson 2013-08-29 15:00:16 -07:00
parent c8f94df593
commit 6fb5874590
1 changed files with 6 additions and 9 deletions
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15
tcg/i386/tcg-target.c
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@ -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);