https://llvm.org/bugs/show_bug.cgi?id=31761
Bug ID: 31761
Summary: GVN incorrectly forwards a load across a clobbering
store.
Product: new-bugs
Version: 3.9
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: new bugs
Assignee: unassignedb...@nondot.org
Reporter: mehdi.am...@apple.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
Created attachment 17896
--> https://llvm.org/bugs/attachment.cgi?id=17896&action=edit
GVN Bug
See attached IR. This is a single-block sequence of:
%0 = Load ptr ; original load
store null, ptr ; clobber...
%1 = load ptr ; reload
The original value is forwarded to the user of the reload.
Reproduces on trunk with opt -gvn repro.ll
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