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LSR: fix expansion of scaled reg in non-address type formulae.

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For non-address users, Base and Scaled registers are not specially
associated to fit an address mode, so SCEVExpander should apply normal
expansion rules. Otherwise we may sink computation into inner loops
that have already been optimized.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@158537 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Andrew Trick 2012-06-15 20:07:29 +00:00
parent 546f210115
commit b6b5b7b691
1 changed files with 18 additions and 14 deletions
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32
lib/Transforms/Scalar/LoopStrengthReduce.cpp
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@ -4268,13 +4268,6 @@ Value *LSRInstance::Expand(const LSRFixup &LF,
Ops.push_back(SE.getUnknown(Rewriter.expandCodeFor(Reg, 0, IP)));
}
// Flush the operand list to suppress SCEVExpander hoisting.
if (!Ops.empty()) {
Value *FullV = Rewriter.expandCodeFor(SE.getAddExpr(Ops), Ty, IP);
Ops.clear();
Ops.push_back(SE.getUnknown(FullV));
}
// Expand the ScaledReg portion.
Value *ICmpScaledV = 0;
if (F.AM.Scale != 0) {
@ -4296,23 +4289,34 @@ Value *LSRInstance::Expand(const LSRFixup &LF,
} else {
// Otherwise just expand the scaled register and an explicit scale,
// which is expected to be matched as part of the address.
// Flush the operand list to suppress SCEVExpander hoisting address modes.
if (!Ops.empty() && LU.Kind == LSRUse::Address) {
Value *FullV = Rewriter.expandCodeFor(SE.getAddExpr(Ops), Ty, IP);
Ops.clear();
Ops.push_back(SE.getUnknown(FullV));
}
ScaledS = SE.getUnknown(Rewriter.expandCodeFor(ScaledS, 0, IP));
ScaledS = SE.getMulExpr(ScaledS,
SE.getConstant(ScaledS->getType(), F.AM.Scale));
Ops.push_back(ScaledS);
// Flush the operand list to suppress SCEVExpander hoisting.
Value *FullV = Rewriter.expandCodeFor(SE.getAddExpr(Ops), Ty, IP);
Ops.clear();
Ops.push_back(SE.getUnknown(FullV));
}
}
// Expand the GV portion.
if (F.AM.BaseGV) {
Ops.push_back(SE.getUnknown(F.AM.BaseGV));
// Flush the operand list to suppress SCEVExpander hoisting.
if (!Ops.empty()) {
Value *FullV = Rewriter.expandCodeFor(SE.getAddExpr(Ops), Ty, IP);
Ops.clear();
Ops.push_back(SE.getUnknown(FullV));
}
Ops.push_back(SE.getUnknown(F.AM.BaseGV));
}
// Flush the operand list to suppress SCEVExpander hoisting of both folded and
// unfolded offsets. LSR assumes they both live next to their uses.
if (!Ops.empty()) {
Value *FullV = Rewriter.expandCodeFor(SE.getAddExpr(Ops), Ty, IP);
Ops.clear();
Ops.push_back(SE.getUnknown(FullV));