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Fix a bug around truncating vector in const prop.

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In constant folding stage, "TRUNC" can't handle vector data type.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216149 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jiangning Liu 2014-08-21 02:12:35 +00:00
parent 150cef218f
commit 82f1a8cc09
2 changed files with 12 additions and 0 deletions
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3
lib/IR/ConstantFold.cpp
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@ -674,6 +674,9 @@ Constant *llvm::ConstantFoldCastInstruction(unsigned opc, Constant *V,
}
return nullptr;
case Instruction::Trunc: {
if (V->getType()->isVectorTy())
return nullptr;
uint32_t DestBitWidth = cast<IntegerType>(DestTy)->getBitWidth();
if (ConstantInt *CI = dyn_cast<ConstantInt>(V)) {
return ConstantInt::get(V->getContext(),

9
test/Transforms/ConstProp/trunc_vec.ll Normal file
View File

@ -0,0 +1,9 @@
; RUN: opt -constprop < %s
; Make sure we don't crash on this one
define <8 x i8> @test_truc_vec() {
%x = bitcast <2 x i64> <i64 1, i64 2> to <8 x i16>
%y = trunc <8 x i16> %x to <8 x i8>
ret <8 x i8> %y
}