https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77468
Aldy Hernandez <aldyh at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |NEW Last reconfirmed| |2017-01-24 CC| |aldyh at gcc dot gnu.org Ever confirmed|0 |1 --- Comment #9 from Aldy Hernandez <aldyh at gcc dot gnu.org> --- Confirmed with: $ wget http://www.phoronix-test-suite.com/benchmark-files/c-ray-1.1.tar.gz $ tar -xzf c-ray-1.1.tar.gz $ cd c-ray-1.1 $ make clean; make CC="~/bld/trunk/install/bin/gcc" rm -f c-ray-mt.o c-ray-mt ~/bld/trunk/install/bin/gcc -O3 -ffast-math -mcpu=cortex-a53 -c -o c-ray-mt.o c-ray-mt.c ~/bld/trunk/install/bin/gcc -o c-ray-mt c-ray-mt.o -lm -lpthread $ ./c-ray-mt -t 32 -s 800x600 -r 8 -i sphfract -o output.ppm c-ray-mt v1.1 Rendering took: 8 seconds (8766 milliseconds) $ make clean; make CC=gcc-5.3.1 rm -f c-ray-mt.o c-ray-mt gcc-5.3.1 -O3 -ffast-math -mcpu=cortex-a53 -c -o c-ray-mt.o c-ray-mt.c gcc-5.3.1 -o c-ray-mt c-ray-mt.o -lm -lpthread aldyh@gcc117:~/c-ray-1.1> ./c-ray-mt -t 32 -s 800x600 -r 8 -i sphfract -o output.ppm c-ray-mt v1.1 Rendering took: 7 seconds (7606 milliseconds) I'll bisect this.