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X86: Properly decode shuffle masks when the constant pool type is weird

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It's possible for the constant pool entry for the shuffle mask to come
from a completely different operation.  This occurs when Constants have
the same bit pattern but have different types.

Make DecodePSHUFBMask tolerant of types which, after a bitcast, are
appropriately sized vector types.

This fixes PR22188.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225597 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
David Majnemer
2015-01-11 05:08:57 +00:00
parent 776673ea09
commit d2f4460ee7
5 changed files with 90 additions and 66 deletions
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10
test/CodeGen/X86/pshufb-mask-comments.ll
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@@ -27,4 +27,14 @@ define <16 x i8> @test3(<16 x i8> %V) {
ret <16 x i8> %1
}
; Test that we won't crash when the constant was reused for another instruction.
define <16 x i8> @test4(<2 x i64>* %V) {
; CHECK-LABEL: test4
; CHECK: pshufb {{.*}}# xmm0 = xmm0[8,9,10,11,12,13,14,15,0,1,2,3,4,5,6,7]
store <2 x i64> <i64 1084818905618843912, i64 506097522914230528>, <2 x i64>* %V, align 16
%1 = tail call <16 x i8> @llvm.x86.ssse3.pshuf.b.128(<16 x i8> undef, <16 x i8> <i8 8, i8 9, i8 10, i8 11, i8 12, i8 13, i8 14, i8 15, i8 0, i8 1, i8 2, i8 3, i8 4, i8 5, i8 6, i8 7>)
ret <16 x i8> %1
}
declare <16 x i8> @llvm.x86.ssse3.pshuf.b.128(<16 x i8>, <16 x i8>) nounwind readnone