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| author | Chris Lattner <sabre@nondot.org> | 2004-07-26 02:47:12 +0000 |
|---|---|---|
| committer | Chris Lattner <sabre@nondot.org> | 2004-07-26 02:47:12 +0000 |
| commit | 595ee7ec26432e4804f1e71817d9cf9b1f86318d (patch) | |
| tree | 4eabcea50fecab9c2abb5d98ddd28bad8cedb94a /lib/Transforms/Scalar/IndVarSimplify.cpp | |
| parent | 8d65a06a3ec0d091c1c2d63c9e934f717b39c0c2 (diff) | |
Throttle back indvar substitution from creating multiplies in loops. This is bad bad bad.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@15227 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Transforms/Scalar/IndVarSimplify.cpp')
| -rw-r--r-- | lib/Transforms/Scalar/IndVarSimplify.cpp | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/lib/Transforms/Scalar/IndVarSimplify.cpp b/lib/Transforms/Scalar/IndVarSimplify.cpp index 5c4c63be5b..7c1f1161f5 100644 --- a/lib/Transforms/Scalar/IndVarSimplify.cpp +++ b/lib/Transforms/Scalar/IndVarSimplify.cpp @@ -607,9 +607,9 @@ void IndVarSimplify::runOnLoop(Loop *L) { // variable. Doing so will put expensive multiply instructions inside // of the loop. For now just disable indvar subst on anything more // complex than a linear addrec. - if (!isa<SCEVAddRecExpr>(SCEV) || - cast<SCEVAddRecExpr>(SCEV)->getNumOperands() < 3) - IndVars.push_back(std::make_pair(PN, SCEV)); + if (SCEVAddRecExpr *AR = dyn_cast<SCEVAddRecExpr>(SCEV)) + if (AR->getNumOperands() == 2 && isa<SCEVConstant>(AR->getOperand(1))) + IndVars.push_back(std::make_pair(PN, SCEV)); } // If there are no induction variables in the loop, there is nothing more to |