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add test to show missing bitcasted vector xor fold 

llvm-svn: 261748
This commit is contained in:
Sanjay Patel 2016-02-24 16:34:29 +00:00
parent a4e35f7092
commit 3a74fb51af
1 changed files with 15 additions and 0 deletions
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15
llvm/test/Transforms/InstCombine/bitcast.ll
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@ -16,6 +16,21 @@ define i32 @test1(i64 %a) {
; CHECK: ret i32 0 ; CHECK: ret i32 0
} }
; FIXME: The bitcasts of the operands to the xor can be eliminated.
define <2 x i32> @xor_two_vector_bitcasts(<1 x i64> %a, <1 x i64> %b) {
%t1 = bitcast <1 x i64> %a to <2 x i32>
%t2 = bitcast <1 x i64> %b to <2 x i32>
%t3 = xor <2 x i32> %t1, %t2
ret <2 x i32> %t3
; CHECK-LABEL: @xor_two_vector_bitcasts(
; CHECK-NEXT: %t1 = bitcast <1 x i64> %a to <2 x i32>
; CHECK-NEXT: %t2 = bitcast <1 x i64> %b to <2 x i32>
; CHECK-NEXT: %t3 = xor <2 x i32> %t1, %t2
; CHECK-NEXT: ret <2 x i32> %t3
}
; Optimize bitcasts that are extracting low element of vector. This happens ; Optimize bitcasts that are extracting low element of vector. This happens
; because of SRoA. ; because of SRoA.
; rdar://7892780 ; rdar://7892780