https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90349
Bug ID: 90349
Summary: missing return with turned on 03 causes infinite loop
Product: gcc
Version: 8.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: volconscious at gmail dot com
Target Milestone: ---
Hello,
I have g++ 8.2.0 (mingw - windows). If I compile this program (notice - program
is not fully correct, there is a missing return statement)
#include <stdio.h>
int test()
{
for (int i = 0; i < 4; i++)
{
printf("i: %d\n", i);
}
//return 0;
}
int main()
{
test();
return 0;
}
with O3 optimization (g++ test.cpp -O3 -o test.exe), it generates infinite
loop:
.LC0:
.string "i: %d\n"
test():
push rbx
xor ebx, ebx
.L2:
mov esi, ebx
mov edi, OFFSET FLAT:.LC0
xor eax, eax
add ebx, 1
call printf
jmp .L2
main:
sub rsp, 8
call test()
