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authorRichard Henderson <rth@twiddle.net>2013-08-29 15:00:16 -0700
committerRichard Henderson <rth@twiddle.net>2013-09-02 09:08:31 -0700
commit6fb5874590589585cdcad4ca2431d9d8d4d491b1 (patch)
tree2d3be57af51676337f6cf2832f50cb5307101ffe
parentc8f94df5934afd9b2011773aaee0fdef714ff573 (diff)
downloadqemu-arm-6fb5874590589585cdcad4ca2431d9d8d4d491b1.tar.gz
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: Aurelien Jarno <aurelien@aurel32.net> Signed-off-by: Richard Henderson <rth@twiddle.net>
-rw-r--r--tcg/i386/tcg-target.c15
1 files changed, 6 insertions, 9 deletions
diff --git a/tcg/i386/tcg-target.c b/tcg/i386/tcg-target.c
index 3ee54f18e2..c1f07415ab 100644
--- a/tcg/i386/tcg-target.c
+++ b/tcg/i386/tcg-target.c
@@ -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);