https://llvm.org/bugs/show_bug.cgi?id=25410
Bug ID: 25410
Summary: [AArch64LoadStoreOpt] Merge narrow zero stores to
wider single store
Product: libraries
Version: trunk
Hardware: PC
OS: Windows NT
Status: NEW
Severity: normal
Priority: P
Component: Backend: AArch64
Assignee: unassignedb...@nondot.org
Reporter: mcros...@codeaurora.org
CC: junb...@codeaurora.org, llvm-bugs@lists.llvm.org
Classification: Unclassified
In r251438 a patch for converting halfword loads into a 32-bit word load was
committed. In a similar vein we should be able to merge adjacent zero stores
into a wider store.
E.g.,
str wzr, [x0]
str wzr, [x0, #4]
to
str xzr, [x0]
-- or --
strh wzr, [x0]
strh wzr, [x0, #2]
to
str wzr, [x0]
This optimization can be generalized, but this is the one case (I can think of)
where we don't have to shuffle bits around because we know we're writing a
zero.
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