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optimize "integer extraction out of the middle of a vector" as produced

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by SRoA.  This is part of rdar://7892780, but needs another xform to
expose this.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112232 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2010-08-26 22:14:59 +00:00
parent 1ab3f16f06
commit 26dbe7ec18
2 changed files with 60 additions and 13 deletions
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25
test/Transforms/InstCombine/bitcast.ll
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@@ -35,3 +35,28 @@ define float @test2(<2 x float> %A, <2 x i32> %B) {
; CHECK-NEXT: %add = fadd float %tmp24, %tmp4
; CHECK-NEXT: ret float %add
}
; Optimize bitcasts that are extracting other elements of a vector. This
; happens because of SRoA.
; rdar://7892780
define float @test3(<2 x float> %A, <2 x i64> %B) {
%tmp28 = bitcast <2 x float> %A to i64
%tmp29 = lshr i64 %tmp28, 32
%tmp23 = trunc i64 %tmp29 to i32
%tmp24 = bitcast i32 %tmp23 to float
%tmp = bitcast <2 x i64> %B to i128
%tmp1 = lshr i128 %tmp, 64
%tmp2 = trunc i128 %tmp1 to i32
%tmp4 = bitcast i32 %tmp2 to float
%add = fadd float %tmp24, %tmp4
ret float %add
; CHECK: @test3
; CHECK-NEXT: %tmp24 = extractelement <2 x float> %A, i32 1
; CHECK-NEXT: bitcast <2 x i64> %B to <4 x float>
; CHECK-NEXT: %tmp4 = extractelement <4 x float> {{.*}}, i32 2
; CHECK-NEXT: %add = fadd float %tmp24, %tmp4
; CHECK-NEXT: ret float %add
}