http://llvm.org/bugs/show_bug.cgi?id=22473
Bug ID: 22473
Summary: LLVM not using cmpb for unsigned char comparison
Product: libraries
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: Backend: X86
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
Small reproduction:
bool f(unsigned char* a, unsigned char b) { return a[0] == b; }
LLVM translates this to
movzbl (%rdi), %eax
cmpl %esi, %eax
GCC instead does
cmpb %dil, (%rsi)
Which according to IACA is better.
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