https://llvm.org/bugs/show_bug.cgi?id=31881
Bug ID: 31881
Summary: Cherry pick r294088 to 4.0 branch
(MachineCopyPropagation fix)
Product: libraries
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: Common Code Generator Code
Assignee: unassignedb...@nondot.org
Reporter: ma...@braunis.de
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
Created attachment 17940
--> https://llvm.org/bugs/attachment.cgi?id=17940&action=edit
Patch adapted to 4.0 branch
r294088 addresses a miscompile in situations with non-coalesced COPY
instructions in combination with deeper register hierarchies (ARMv7 neon in
this case). The problem was found in swift code but the issue is general.
The patch needs to be slightly adapted for the 4.0 branch, I attached a patch.
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