https://bugs.llvm.org/show_bug.cgi?id=45518
Bug ID: 45518
Summary: _mulx_u64() intrinsic does not generate MULX
Product: libraries
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: enhancement
Priority: P
Component: Backend: X86
Assignee: unassignedb...@nondot.org
Reporter: a...@google.com
CC: craig.top...@gmail.com, llvm-bugs@lists.llvm.org,
llvm-...@redking.me.uk, spatel+l...@rotateright.com
The _mulx_u64() intrinsic generates a MUL instead of a MULX:
#include <cstdint>
#include <x86intrin.h>
auto mulx(uint64_t a, uint64_t b, uint64_t* c) {
return _mulx_u64(a, b, (unsigned long long *)c);
}
clang trunk, -O2 -march=skylake:
mulx(unsigned long, unsigned long, unsigned long*):
#
@mulx(unsigned long, unsigned long, unsigned long*)
mov rcx, rdx
mov rax, rsi
mul rdi
mov qword ptr [rcx], rdx
ret
https://godbolt.org/z/rsGQWm
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