https://llvm.org/bugs/show_bug.cgi?id=31038
Bug ID: 31038
Summary: r286875 is clobbering my other stores with zeros
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: Backend: AArch64
Assignee: unassignedbugs at nondot.org
Reporter: andrew.b.adams at gmail.com
CC: llvm-bugs at lists.llvm.org
Classification: Unclassified
Created attachment 17595
--> https://llvm.org/bugs/attachment.cgi?id=17595&action=edit
.ll and .s before and after
I have code that stores zero values interleaved with non-zero values. It
produces the right results with r286874, but incorrect results with r286875.
The .ll and .s before and after is attached.
The meaningful difference in the assembly seems to be
before:
movi d1, #0000000000000000
...
str d1, [x27], #8
after:
str xzr, [x27]
str xzr, [x27, #8]!
I think both d1 and xzr are 64-bit, so I'm not sure why there's an extra store,
and I think it's clobbering my other stores.
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