https://bugs.llvm.org/show_bug.cgi?id=35711
Bug ID: 35711
Summary: std::gcd and std::lcm doesn't precalculate in
compile-time
Product: clang
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: enhancement
Priority: P
Component: LLVM Codegen
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
clang (trunk) with '-O3 -std=c++17' for this code:
#include <numeric>
unsigned test()
{
return std::gcd(2,4);
}
generates this:
test(): # @test()
mov edx, 4
mov eax, 2
.LBB0_1: # =>This Inner Loop Header: Depth=1
mov ecx, edx
cdq
idiv ecx
mov eax, ecx
test edx, edx
jne .LBB0_1
mov eax, ecx
neg eax
cmovl eax, ecx
ret
gcc (trunk) with '-O3 -std=c++17':
test():
mov eax, 2
ret
Similar issue fot std::lcm (GCC also calculate it in compile-time).
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