https://llvm.org/bugs/show_bug.cgi?id=27162
Bug ID: 27162
Summary: Dead stores from lowered memset
Product: libraries
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: Backend: AArch64
Assignee: unassignedb...@nondot.org
Reporter: junb...@codeaurora.org
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
Given the below C code :
void foo (long *P, long n) {
memset(P, 0, 32);
P[0] = n;
P[1] = n;
P[2] = n;
}
Current trunk generate asm code like below :
stp xzr, xzr, [x0, #16]
stp xzr, xzr, [x0]
stp x1, x1, [x0]
str x1, [x0, #16]
ret
The lowered store instructions from memset are dead by the stores following the
memset.
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