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Move the EliminateIVUsers call back out to its original location. Now that
a ScalarEvolution bug with overflow handling is fixed, the normal analysis code will automatically decline to operate on the icmp instructions which are responsible for the loop exit. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@101032 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -406,6 +406,9 @@ bool IndVarSimplify::runOnLoop(Loop *L, LPPassManager &LPM) {
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if (!isa<SCEVCouldNotCompute>(BackedgeTakenCount))
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RewriteLoopExitValues(L, Rewriter);
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// Simplify ICmp IV users.
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EliminateIVComparisons();
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// Compute the type of the largest recurrence expression, and decide whether
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// a canonical induction variable should be inserted.
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const Type *LargestType = 0;
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@ -471,19 +474,10 @@ bool IndVarSimplify::runOnLoop(Loop *L, LPPassManager &LPM) {
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ExitingBlock) {
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assert(NeedCannIV &&
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"LinearFunctionTestReplace requires a canonical induction variable");
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// Can't rewrite non-branch yet.
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if (BranchInst *BI = dyn_cast<BranchInst>(ExitingBlock->getTerminator())) {
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// Eliminate comparisons which are always true or always false, due to
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// the known backedge-taken count. This may include comparisons which
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// are currently controlling (part of) the loop exit, so we can only do
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// it when we know we're going to insert our own loop exit code.
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EliminateIVComparisons();
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// Insert new loop exit code.
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if (BranchInst *BI = dyn_cast<BranchInst>(ExitingBlock->getTerminator()))
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NewICmp = LinearFunctionTestReplace(L, BackedgeTakenCount, IndVar,
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ExitingBlock, BI, Rewriter);
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}
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}
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// Rewrite IV-derived expressions. Clears the rewriter cache.
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