https://bugs.llvm.org/show_bug.cgi?id=47432
Bug ID: 47432
Summary: Optimization for a * 10 == b * 10
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: Scalar Optimizations
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
bool f(int a, int b)
{
return a * 9 == b * 9;
}
bool g(int a, int b)
{
return a * 10 == b * 10;
}
bool h(int a, int b)
{
return a * 11 == b * 11;
}
Clang:
f(int, int): # @f(int, int)
cmp edi, esi
sete al
ret
g(int, int): # @g(int, int)
xor edi, esi
test edi, 2147483647
sete al
ret
h(int, int): # @h(int, int)
cmp edi, esi
sete al
ret
Why 10 is so special here?
https://godbolt.org/z/jdPhf5
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