xemu-project/xemu
1
0
Fork 0
mirror of https://github.com/xemu-project/xemu.git synced 2024-11-24 12:09:58 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

TCG: Use x86-64 zero extension instructions.

Browse Source 
Signed-off-by: Paul Brook <paul@codesourcery.com>


git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5180 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
pbrook 2008-09-07 18:07:39 +00:00
parent b6d17150af
commit 733fef0e40
1 changed files with 15 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
tcg/x86_64/tcg-target.c
View File

@ -382,6 +382,12 @@ static inline void tgen_arithi32(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) {
/* movzbl */
tcg_out_modrm(s, 0xb6 | P_EXT | P_REXB, 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);
@ -393,6 +399,15 @@ static inline void tgen_arithi64(TCGContext *s, int c, int r0, int64_t val)
if (val == (int8_t)val) {
tcg_out_modrm(s, 0x83 | P_REXW, c, r0);
tcg_out8(s, val);
} else if (c == ARITH_AND && val == 0xffu) {
/* movzbl */
tcg_out_modrm(s, 0xb6 | P_EXT | P_REXW, r0, r0);
} else if (c == ARITH_AND && val == 0xffffu) {
/* movzwl */
tcg_out_modrm(s, 0xb7 | P_EXT | P_REXW, r0, r0);
} else if (c == ARITH_AND && val == 0xffffffffu) {
/* 32-bit mov zero extends */
tcg_out_modrm(s, 0x8b, r0, r0);
} else if (val == (int32_t)val) {
tcg_out_modrm(s, 0x81 | P_REXW, c, r0);
tcg_out32(s, val);