https://bugs.llvm.org/show_bug.cgi?id=38960
Bug ID: 38960
Summary: [X86] Poor codegen for comieq/comine intrinsics
feeding a branch
Product: libraries
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: enhancement
Priority: P
Component: Backend: X86
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
#include <x86intrin.h>
void foo();
void test_mm_comieq_ss(__m128 A, __m128 B) {
if (_mm_comieq_ss(A, B))
foo();
}
Produces
test_mm_comieq_ss(float __vector(4), float __vector(4)): #
@test_mm_comieq_ss(float __vector(4), float __vector(4))
vcomiss %xmm1, %xmm0
setnp %al
sete %cl
andb %al, %cl
movzbl %cl, %eax
testl %eax, %eax
je .LBB0_1
jmp foo() # TAILCALL
.LBB0_1:
retq
Ideally we should only produce a vcomiss and two conditional jumps.
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