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509fb2c84c
This patch fixes issues with vector constant folding not correctly handling scalar input operands if they require implicit truncation - this was tested with llvm-stress as recommended by Patrik H Hagglund. The patch ensures that integer input scalars from a build vector are correctly truncated before folding, and that constant integer scalar results are promoted to a legal type before inclusion in the new folded build vector. I have added another crash test case and also a test for UINT_TO_FP / SINT_TO_FP using an non-truncated scalar input, which was failing before this patch. Differential Revision: http://reviews.llvm.org/D9282 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@236308 91177308-0d34-0410-b5e6-96231b3b80d8
18 lines
475 B
LLVM
18 lines
475 B
LLVM
; RUN: llc < %s -mtriple=i686-unknown -mattr=+avx
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; RUN: llc < %s -mtriple=x86_64-unknown -mattr=+avx
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;
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; llvm-stress generated crash case due to build_vector implicit
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; truncation bug from constant folding after legalization.
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;
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@G = external global i32
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define void @bv_crash_test() {
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%I = insertelement <4 x i64> zeroinitializer, i64 15910, i32 0
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%Tr = trunc <4 x i64> %I to <4 x i8>
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%Bc = bitcast <4 x i8> %Tr to i32
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store volatile i32 %Bc, i32* @G
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ret void
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}
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