https://bugs.llvm.org/show_bug.cgi?id=42490
Bug ID: 42490
Summary: Suboptimal LEA codegen
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: Backend: X86
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected],
[email protected], [email protected]
Haswell X86-64
int extra_lea(int *p, int xp) {
*p = xp + 21;
return *p * 2;
}
Clang -O3 trunk:
extra_lea(int*, int): # @extra_lea(int*, int)
lea eax, [rsi + 21]
mov dword ptr [rdi], eax
lea eax, [rsi + rsi]
add eax, 42
ret
GCC -O3 trunk:
extra_lea(int*, int):
lea eax, [rsi+21]
mov DWORD PTR [rdi], eax
add eax, eax
ret
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