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[InstCombine] Fix visitSwitchInst to use right operand types for sub cstexpr

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The visitSwitchInst generates SUB constant expressions to recompute the
switch condition. When truncating the condition to a smaller type, SUB
expressions should use the previous type (before trunc) for both
operands. This fixes an assertion crash.

Differential Revision: http://reviews.llvm.org/D6644

rdar://problem/19191835

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224574 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bruno Cardoso Lopes
2014-12-19 14:23:15 +00:00
parent 6500a9867f
commit cba407d019
2 changed files with 34 additions and 2 deletions
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6
lib/Transforms/InstCombine/InstructionCombining.cpp
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@ -2115,8 +2115,10 @@ Instruction *InstCombiner::visitSwitchInst(SwitchInst &SI) {
for (SwitchInst::CaseIt i = SI.case_begin(), e = SI.case_end();
i != e; ++i) {
ConstantInt* CaseVal = i.getCaseValue();
Constant* NewCaseVal = ConstantExpr::getSub(cast<Constant>(CaseVal),
AddRHS);
Constant *LHS = LeadingKnownZeros
? ConstantExpr::getZExt(CaseVal, Cond->getType())
: ConstantExpr::getSExt(CaseVal, Cond->getType());
Constant* NewCaseVal = ConstantExpr::getSub(LHS, AddRHS);
assert(isa<ConstantInt>(NewCaseVal) &&
"Result of expression should be constant");
i.setValue(cast<ConstantInt>(NewCaseVal));