friedkiwi/qemu
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

target/i386: add more easy cases to gen_eflags_adcox

Browse Source 
prepare_update_cf() sometimes results in CC_OP_ADCX, so this
improves a bit the handling of BT+RCL and the like.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini
2026-05-28 18:50:16 +02:00
parent e38d0afade
commit b3126dc77d
1 changed files with 7 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

10
target/i386/tcg/emit.c.inc
View File

@@ -3332,17 +3332,21 @@ static bool gen_eflags_adcox(DisasContext *s, X86DecodedInsn *decode, bool want_
* to be followed by rotations within the same basic block.
*/
switch (s->cc_op) {
case CC_OP_ADCX:
case CC_OP_ADOX:
case CC_OP_ADCOX:
/* No need to compute the full EFLAGS, CF/OF are already isolated. */
tcg_gen_mov_tl(decode->cc_src, cpu_cc_src);
if (need_flags) {
if (s->cc_op != CC_OP_ADCX && need_flags) {
tcg_gen_mov_tl(decode->cc_src2, cpu_cc_src2);
got_of = true;
}
if (want_carry || need_flags) {
if (s->cc_op != CC_OP_ADOX && (want_carry || need_flags)) {
tcg_gen_mov_tl(decode->cc_dst, cpu_cc_dst);
got_cf = true;
}
/* fallthrough */
case CC_OP_EFLAGS:
tcg_gen_mov_tl(decode->cc_src, cpu_cc_src);
break;
case CC_OP_LOGICB ... CC_OP_LOGICQ: