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Fix a DAGCombiner crash when folding binary vector operations with constant

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BUILD_VECTOR operands where the element type is not legal.  I had previously
changed this code to insert TRUNCATE operations, but that was just wrong.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122102 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bob Wilson
2010-12-17 23:06:49 +00:00
parent 4c6b3d35bb
commit d727343a40
2 changed files with 23 additions and 16 deletions
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test/CodeGen/ARM/vector-DAGCombine.ll
+14
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@@ -61,3 +61,17 @@ define void @lshrIllegalType(<8 x i32>* %A) nounwind {
ret void
}
; Test folding a binary vector operation with constant BUILD_VECTOR
; operands with i16 elements.
define void @test_i16_constant_fold() nounwind optsize {
entry:
%0 = sext <4 x i1> zeroinitializer to <4 x i16>
%1 = add <4 x i16> %0, zeroinitializer
%2 = shufflevector <4 x i16> %1, <4 x i16> undef, <8 x i32> <i32 0, i32 1, i32 2, i32 3, i32 4, i32 5, i32 6, i32 7>
%3 = add <8 x i16> %2, <i16 1, i16 1, i16 1, i16 1, i16 1, i16 1, i16 1, i16 1>
%4 = trunc <8 x i16> %3 to <8 x i8>
tail call void @llvm.arm.neon.vst1.v8i8(i8* undef, <8 x i8> %4, i32 1)
unreachable
}
declare void @llvm.arm.neon.vst1.v8i8(i8*, <8 x i8>, i32) nounwind