Created attachment 1429136 [details]
preprocessed source

/opt/rh/devtoolset-7/root/usr/bin/gcc -std=gnu11 -Wall -g  -D_GNU_SOURCE -m64 -fopenmp  -mavx2 -O3  -ffast-math -fno-unsafe-math-optimizations -mfma fmabug.c -lm -o fmabugf
fmabug.c: In function ‘main’:
fmabug.c:63:5: internal compiler error: in compute_live_loop_exits, at tree-ssa-loop-manip.c:229
 int main( int argc, char** argv)

I wrote a small test program to try to understand why I was getting wrong answers when using the fma() function, with -mfma enabled. I built the program twice, once without -mfma, in which case it compiled and ran fine, and once with  when I got the compiler crash above.


Version-Release number of selected component (if applicable):
/user/dmuir/utils/la/test% /opt/rh/devtoolset-7/root/usr/bin/gcc --version
gcc (GCC) 7.2.1 20170829 (Red Hat 7.2.1-1)
Copyright (C) 2017 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.



How reproducible:
Compile the program

Additional info: