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Revert r237539: "Reapply r237520 with another fix for infinite looping"

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This caused PR23583.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@237739 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Hans Wennborg
2015-05-19 23:06:30 +00:00
parent 486f97bf19
commit c0f6113287
6 changed files with 7 additions and 162 deletions
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9
lib/Transforms/InstCombine/InstCombineCasts.cpp
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@@ -435,15 +435,6 @@ Instruction *InstCombiner::visitTrunc(TruncInst &CI) {
if (Instruction *Result = commonCastTransforms(CI))
return Result;
// Test if the trunc is the user of a select which is part of a
// minimum or maximum operation. If so, don't do any more simplification.
// Even simplifying demanded bits can break the canonical form of a
// min/max.
Value *LHS, *RHS;
if (SelectInst *SI = dyn_cast<SelectInst>(CI.getOperand(0)))
if (matchSelectPattern(SI, LHS, RHS) != SPF_UNKNOWN)
return nullptr;
// See if we can simplify any instructions used by the input whose sole
// purpose is to compute bits we don't care about.
if (SimplifyDemandedInstructionBits(CI))