aboutsummaryrefslogtreecommitdiff
path: root/tcg
diff options
context:
space:
mode:
authorAurelien Jarno <aurelien@aurel32.net>2009-09-27 19:36:05 +0200
committerAurelien Jarno <aurelien@aurel32.net>2009-09-27 20:00:38 +0200
commitb70650cbfea324438f55c2269138dd7f4e7cf086 (patch)
treeef9d00d4145ef450001c3f418d3ac565b0a34b8b /tcg
parentCompile some user files only once for all targets (diff)
downloadqemu-kvm-b70650cbfea324438f55c2269138dd7f4e7cf086.tar.gz
qemu-kvm-b70650cbfea324438f55c2269138dd7f4e7cf086.tar.bz2
qemu-kvm-b70650cbfea324438f55c2269138dd7f4e7cf086.zip
tcg/i386: optimize and $0xff(ff), reg
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
Diffstat (limited to 'tcg')
-rw-r--r--tcg/i386/tcg-target.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/tcg/i386/tcg-target.c b/tcg/i386/tcg-target.c
index a95fe4c20..d318443ff 100644
--- a/tcg/i386/tcg-target.c
+++ b/tcg/i386/tcg-target.c
@@ -281,6 +281,12 @@ static inline void tgen_arithi(TCGContext *s, int c, int r0, int32_t val)
if (val == (int8_t)val) {
tcg_out_modrm(s, 0x83, c, r0);
tcg_out8(s, val);
+ } else if (c == ARITH_AND && val == 0xffu && r0 < 4) {
+ /* movzbl */
+ tcg_out_modrm(s, 0xb6 | P_EXT, r0, r0);
+ } else if (c == ARITH_AND && val == 0xffffu) {
+ /* movzwl */
+ tcg_out_modrm(s, 0xb7 | P_EXT, r0, r0);
} else {
tcg_out_modrm(s, 0x81, c, r0);
tcg_out32(s, val);