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When determining the new index for an insertelement, we may not assume that an

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index greater than the size of the vector is invalid. The shuffle may be
shrinking the size of the vector. Fixes a crash!

Also drop the maximum recursion depth of the safety check for this
optimization to five.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@183080 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nick Lewycky
2013-06-01 20:51:31 +00:00
parent a0b34d6c4a
commit e4546cb71e
2 changed files with 20 additions and 7 deletions
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11
test/Transforms/InstCombine/vec_shuffle.ll
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@@ -174,3 +174,14 @@ define <2 x i8> @test13b(i8 %x) {
%B = shufflevector <2 x i8> %A, <2 x i8> undef, <2 x i32> <i32 undef, i32 0>
ret <2 x i8> %B
}
define <2 x i8> @test13c(i8 %x1, i8 %x2) {
; CHECK: @test13c
; CHECK-NEXT: insertelement <2 x i8> {{.*}}, i32 0
; CHECK-NEXT: insertelement <2 x i8> {{.*}}, i32 1
; CHECK-NEXT: ret
%A = insertelement <4 x i8> undef, i8 %x1, i32 0
%B = insertelement <4 x i8> %A, i8 %x2, i32 2
%C = shufflevector <4 x i8> %B, <4 x i8> undef, <2 x i32> <i32 0, i32 2>
ret <2 x i8> %C
}