https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78487
--- Comment #2 from Stephan Beyer <s-beyer at gmx dot net> --- The following problem is only reproducible on one machine. I cannot reproduce it on any other machine. When compiling the attached C++ source file with g++ -O1 -fgcse, it crashes at the third cpuid call (ie, there are three output lines). When just using g++ -O1 (without -fgcse), it works well. Changing the code in main() slightly or making cpuid() inline makes it work well also with -fgcse. uname -a and g++ --version of that machine says: Linux ipc675 3.16.0-4-amd64 #1 SMP Debian 3.16.7-ckt4-3 (2015-02-03) x86_64 GNU/Linux g++ (Debian 6.2.0-13) 6.2.0 20161109 If useful, I can also attach assembly output of the crashing code (with -fgcse), of the code without -fgcse and of the code with "inline" (there using -fgcse makes no difference). The code is not written by me, so I don't know if its "correct" or if the input/output asm constraints are just used wrong. (It's just the minimal example I got from code where a crash occurred.) PS: excuse the first empty bug report, it seems I am too stupid for bugzilla.
