instcombine miscompile

[llvmbot]

Bugzilla Link	1898
Resolution	FIXED
Resolved on	Nov 07, 2018 00:22
Version	trunk
OS	MacOS X
Attachments	failing .ll file
Reporter	LLVM Bugzilla Contributor

Extended Description

Attached .ll file works when run directly through llc (on Darwin x86). Fails when run through opt -std-compile-opts first. This is a regression from 12/13/07.
This is from gcc.c-torture/execute/20000403-1.c in the gcc testsuite (with llvm-gcc-4.2).
There are 3 similar failures (runtime failure at optimization other than -O0); I'm hopeful they're all the same:
gcc.c-torture/execute/920711-1.c
gcc.c-torture/execute/cmpsi-1.c
gcc.c-torture/execute/loop-3b.c

[lattner]

I'll take a look

[lattner]

Yay for bugpoint, this looks like instcombine.

[lattner]

Fix here:
http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20071231/056817.html

-Chris

[llvmbot]

This fixes all the above regressions, thanks.