https://bugs.llvm.org/show_bug.cgi?id=38334
Bug ID: 38334
Summary: Propagate null pattern into condition blocks
Product: libraries
Version: 6.0
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: Scalar Optimizations
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Code:
void * foo2(void *p, void *q, void *r) {
if (!p && !q)
return p;
return NULL;
}
Currently:
foo2: # @foo2
xor eax, eax
or rsi, rdi
cmove rax, rdi
ret
Should be:
foo2: # @foo2
xor eax, eax
ret
Proof of legality:
https://rise4fun.com/Alive/jB8
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