http://llvm.org/bugs/show_bug.cgi?id=16057
Bug ID: 16057
Summary: less efficient comparison of global addresses
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: Backend: X86
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
Given
extern int x;
_Bool f(int *y) {
return &x == y;
}
gcc produces
f:
cmpq $x, %rdi
sete %al
ret
clang produces
f:
movl $x, %eax
cmpq %rax, %rdi
sete %al
ret
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