https://bugs.llvm.org/show_bug.cgi?id=49927
Bug ID: 49927
Summary: DSE fails to eliminate store of same value
Product: libraries
Version: trunk
Hardware: PC
OS: Windows NT
Status: NEW
Severity: enhancement
Priority: P
Component: Scalar Optimizations
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
void dse_missed (int *q, int *p)
{
int y = *p;
*q = y;
*p = y;
}
gcc
dse_missed(int*, int*):
mov eax, DWORD PTR [rsi]
mov DWORD PTR [rdi], eax
ret
dse_missed(int*, int*): # @dse_missed(int*, int*)
mov eax, dword ptr [rsi]
mov dword ptr [rdi], eax
mov dword ptr [rsi], eax
ret
https://godbolt.org/z/8Pb9ne4vh
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