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| author | Richard Henderson <rth@twiddle.net> | 2013-08-29 15:00:16 -0700 |
|---|---|---|
| committer | Richard Henderson <rth@twiddle.net> | 2013-09-02 09:08:31 -0700 |
| commit | 6fb5874590589585cdcad4ca2431d9d8d4d491b1 (patch) | |
| tree | 2d3be57af51676337f6cf2832f50cb5307101ffe | |
| parent | c8f94df5934afd9b2011773aaee0fdef714ff573 (diff) | |
| download | qemu-6fb5874590589585cdcad4ca2431d9d8d4d491b1.tar.gz qemu-6fb5874590589585cdcad4ca2431d9d8d4d491b1.tar.bz2 qemu-6fb5874590589585cdcad4ca2431d9d8d4d491b1.zip | |
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.c | 15 |
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); |