http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56321
Bug #: 56321
Summary: ICE:segfault in midend for -funsafe-math-optimizations
-O3
Classification: Unclassified
Product: gcc
Version: 4.8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
AssignedTo: unassig...@gcc.gnu.org
ReportedBy: ktkac...@gcc.gnu.org
CC: jgreenha...@gcc.gnu.org, wschm...@linux.vnet.ibm.com
Target: arm-none-eabi, x86_64-unknown-linux-gnu
Created attachment 29449
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=29449
ICE triggers for -O3 -funsafe-math-optimizations
Attached test case triggers a segfault in the midend.
Observed on both arm-none-eabi and x86_64-unknown-linux-gnu
gcc -O3 -funsafe-math-optimizations test.c -S
test.c: In function ‘foo’:
test.c:1:7: internal compiler error: Segmentation fault
float foo(int n)
^
0x8f4e45 crash_signal
../../gcc-fsf/gcc/toplev.c:332
0x84b7bc execute_function_todo
../../gcc-fsf/gcc/passes.c:1967
0x84da0d execute_todo
../../gcc-fsf/gcc/passes.c:1999
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <http://gcc.gnu.org/bugs.html> for instructions.
Bisection showed r186567 introduced the problem.
It seems that the reassoc code tries to do something wrong with __builtin_pow*
