[llvm-bugs] [Bug 31953] New: GVN miscompile
via llvm-bugs
llvm-bugs at lists.llvm.org
Mon Feb 13 15:40:02 PST 2017
https://bugs.llvm.org/show_bug.cgi?id=31953
Bug ID: 31953
Summary: GVN miscompile
Product: libraries
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: enhancement
Priority: P
Component: Scalar Optimizations
Assignee: unassignedbugs at nondot.org
Reporter: mehdi.amini at apple.com
CC: llvm-bugs at lists.llvm.org
Created attachment 17975
--> https://bugs.llvm.org/attachment.cgi?id=17975&action=edit
GVN bug test-case
I haven't been able to figure out why, but this is annoyingly miscompiling a
quite simple C++ file:
$ opt -gvn opt.before.gvn.bc -o opt.bc && llc opt.bc -filetype=obj -o
opt.llc.o && clang opt.llc.o && ./a.out | grep TEST2
… oldCodeResult is INCORRECT
Without GVN:
$ opt opt.before.gvn.bc -o opt.bc && llc opt.bc -filetype=obj -o
opt.llc.o && clang opt.llc.o && ./a.out | grep TEST2
… oldCodeResult is OK
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