https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104639
Bug ID: 104639
Summary: Useless loop not fully optimized anymore
Product: gcc
Version: 12.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: denis.campredon at gmail dot com
Target Milestone: ---
the following code compiled with -02
-------------------
bool foo(int i) {
while (i == 4)
i += 2;
return i;
}
------------------
Trunk generates the following assembly
---------
foo(int):
cmp edi, 4
mov eax, 6
cmove edi, eax
test edi, edi
setne al
ret
---------
whereas 11.2 generate more optimized assembly
---------
foo(int):
test edi, edi
setne al
ret
--------
