https://bugs.llvm.org/show_bug.cgi?id=50421
Bug ID: 50421
Summary: clang does not optimize alignment checks
Product: clang
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: LLVM Codegen
Assignee: unassignedclangb...@nondot.org
Reporter: gonzalo.gades...@gmail.com
CC: llvm-bugs@lists.llvm.org, neeil...@live.com,
richard-l...@metafoo.co.uk
Example: https://godbolt.org/z/G8j6dbG6T
#include <cstdint>
bool copy(int* out, int* in) {
*out = *in;
return (std::uintptr_t)in % 4 == 0;
}
does not optimize the alignment check away:
copy(int*, int*): # @copy(int*, int*)
mov eax, dword ptr [rsi]
mov dword ptr [rdi], eax
test sil, 3
sete al
ret
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