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* [Bug tree-optimization/107449] New: CD-DCE fails to eliminate abnormal incoming edges
@ 2022-10-28 13:09 rguenth at gcc dot gnu.org
0 siblings, 0 replies; only message in thread
From: rguenth at gcc dot gnu.org @ 2022-10-28 13:09 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107449
Bug ID: 107449
Summary: CD-DCE fails to eliminate abnormal incoming edges
Product: gcc
Version: 13.0
Status: UNCONFIRMED
Keywords: ice-checking, ice-on-valid-code
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: rguenth at gcc dot gnu.org
CC: asolokha at gmx dot com
Depends on: 107447
Target Milestone: ---
+++ This bug was initially created as a clone of Bug #107447 +++
int n;
void
bar (int, int);
__attribute__ ((noinline, returns_twice)) int
zero (void)
{
return 0;
}
void
foo (void)
{
(void) zero ();
n = 0;
for (;;)
bar (zero (), n);
}
With this testcase GCC fails to eliminate the abnormal edges into the
first zero () call which is elided by CD-DCE.
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107447
[Bug 107447] [13 Regression] ICE: verify_flow_info failed (error: returns_twice
call is not first in basic block 2)
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2022-10-28 13:09 [Bug tree-optimization/107449] New: CD-DCE fails to eliminate abnormal incoming edges rguenth at gcc dot gnu.org
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