https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80969
Bug ID: 80969
Summary: [8 Regression] ICE in ix86_expand_prologue, at
config/i386/i386.c:14606
Product: gcc
Version: 7.0
Status: UNCONFIRMED
Keywords: ice-on-valid-code
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: marxin at gcc dot gnu.org
Target Milestone: ---
Target: x86_64-linux-gnu
Starting from r248029, I see following ICE:
$ cat ice.ii
int a[56];
int b;
main() {
int c;
for (; b; b++) {
c = b;
if (b & 1)
c = 2;
a[b] = c;
}
}
$ gcc /tmp/ice.ii -Ofast -mabi=ms -c -mavx512f
/tmp/ice.ii: In function ‘int main()’:
/tmp/ice.ii:11:1: internal compiler error: in ix86_expand_prologue, at
config/i386/i386.c:14606
}
^
0x115b342 ix86_expand_prologue()
../../gcc/config/i386/i386.c:14606
0x138772a gen_prologue()
../../gcc/config/i386/i386.md:12456
0x113f9e8 target_gen_prologue
../../gcc/config/i386/i386.md:18678
0xb3da37 make_prologue_seq
../../gcc/function.c:5842
0xb3dc04 thread_prologue_and_epilogue_insns()
../../gcc/function.c:5959
0xb3e2a2 rest_of_handle_thread_prologue_and_epilogue
../../gcc/function.c:6428
0xb3e2a2 execute
../../gcc/function.c:6470
