[llvm-commits] bug fix - SSE - shuffling 2 vectors size 2 into one vector size 2

[Badouh, Asaf]

Bug description: merging two vector (2 x double)  into one vector where the first component is A.1 and the second is B.1 gave a vector with (A.1, undef) in corei7, the correct output should be (A.1, B.1).



The lit test that related to this issue need to be update:

(llvm\test\CodeGen\X86\sse2.ll)



define void @test2(<2 x double>* %r, <2 x double>* %A, double %B) nounwind  {

     %tmp3 = load <2 x double>* %A, align 16

     %tmp7 = insertelement <2 x double> undef, double %B, i32 0

     %tmp9 = shufflevector <2 x double> %tmp3, <2 x double> %tmp7, <2 x i32> < i32 0, i32 2 >

     store <2 x double> %tmp9, <2 x double>* %r, align 16

     ret void



; CHECK: test2:

; CHECK:       movsd   12(%esp), %xmm0

; CHECK-NEXT:   movl    8(%esp), %eax

; CHECK-NEXT:   movlpd  (%eax), %xmm0

; CHECK-NEXT:   movl    4(%esp), %eax

; CHECK-NEXT:   movapd  %xmm0, (%eax)

; CHECK-NEXT:   ret

}

The correct code that need to be generate is:

; CHECK: test2:
; CHECK:                      movl    8(%esp), %eax
; CHECK-NEXT:            movapd  (%eax), %xmm0
; CHECK-NEXT:            movhpd  12(%esp), %xmm0
; CHECK-NEXT:            movl    4(%esp), %eax
; CHECK-NEXT:            movapd  %xmm0, (%eax)
; CHECK-NEXT:            ret



Thanks,
Asaf

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Intel Israel (74) Limited

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