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Minor code cleanups. Do more of the work before the if statements

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instead of within their controlling expressions.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@72007 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman
2009-05-18 15:58:39 +00:00
parent f78a978d46
commit 5183caebc1
1 changed files with 21 additions and 16 deletions
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25
lib/Analysis/ScalarEvolution.cpp
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@@ -806,8 +806,9 @@ SCEVHandle ScalarEvolution::getZeroExtendExpr(const SCEVHandle &Op,
// the addrec's type. The count is always unsigned. // the addrec's type. The count is always unsigned.
SCEVHandle CastedMaxBECount = SCEVHandle CastedMaxBECount =
getTruncateOrZeroExtend(MaxBECount, Start->getType()); getTruncateOrZeroExtend(MaxBECount, Start->getType());
if (MaxBECount == SCEVHandle RecastedMaxBECount =
getTruncateOrZeroExtend(CastedMaxBECount, MaxBECount->getType())) { getTruncateOrZeroExtend(CastedMaxBECount, MaxBECount->getType());
if (MaxBECount == RecastedMaxBECount) {
const Type *WideTy = const Type *WideTy =
IntegerType::get(getTypeSizeInBits(Start->getType()) * 2); IntegerType::get(getTypeSizeInBits(Start->getType()) * 2);
// Check whether Start+Step*MaxBECount has no unsigned overflow. // Check whether Start+Step*MaxBECount has no unsigned overflow.
@@ -815,10 +816,11 @@ SCEVHandle ScalarEvolution::getZeroExtendExpr(const SCEVHandle &Op,
getMulExpr(CastedMaxBECount, getMulExpr(CastedMaxBECount,
getTruncateOrZeroExtend(Step, Start->getType())); getTruncateOrZeroExtend(Step, Start->getType()));
SCEVHandle Add = getAddExpr(Start, ZMul); SCEVHandle Add = getAddExpr(Start, ZMul);
if (getZeroExtendExpr(Add, WideTy) == SCEVHandle OperandExtendedAdd =
getAddExpr(getZeroExtendExpr(Start, WideTy), getAddExpr(getZeroExtendExpr(Start, WideTy),
getMulExpr(getZeroExtendExpr(CastedMaxBECount, WideTy), getMulExpr(getZeroExtendExpr(CastedMaxBECount, WideTy),
getZeroExtendExpr(Step, WideTy)))) getZeroExtendExpr(Step, WideTy)));
if (getZeroExtendExpr(Add, WideTy) == OperandExtendedAdd)
// Return the expression with the addrec on the outside. // Return the expression with the addrec on the outside.
return getAddRecExpr(getZeroExtendExpr(Start, Ty), return getAddRecExpr(getZeroExtendExpr(Start, Ty),
getZeroExtendExpr(Step, Ty), getZeroExtendExpr(Step, Ty),
@@ -830,10 +832,11 @@ SCEVHandle ScalarEvolution::getZeroExtendExpr(const SCEVHandle &Op,
getMulExpr(CastedMaxBECount, getMulExpr(CastedMaxBECount,
getTruncateOrSignExtend(Step, Start->getType())); getTruncateOrSignExtend(Step, Start->getType()));
Add = getAddExpr(Start, SMul); Add = getAddExpr(Start, SMul);
if (getZeroExtendExpr(Add, WideTy) == OperandExtendedAdd =
getAddExpr(getZeroExtendExpr(Start, WideTy), getAddExpr(getZeroExtendExpr(Start, WideTy),
getMulExpr(getZeroExtendExpr(CastedMaxBECount, WideTy), getMulExpr(getZeroExtendExpr(CastedMaxBECount, WideTy),
getSignExtendExpr(Step, WideTy)))) getSignExtendExpr(Step, WideTy)));
if (getZeroExtendExpr(Add, WideTy) == OperandExtendedAdd)
// Return the expression with the addrec on the outside. // Return the expression with the addrec on the outside.
return getAddRecExpr(getZeroExtendExpr(Start, Ty), return getAddRecExpr(getZeroExtendExpr(Start, Ty),
getSignExtendExpr(Step, Ty), getSignExtendExpr(Step, Ty),
@@ -891,8 +894,9 @@ SCEVHandle ScalarEvolution::getSignExtendExpr(const SCEVHandle &Op,
// the addrec's type. The count is always unsigned. // the addrec's type. The count is always unsigned.
SCEVHandle CastedMaxBECount = SCEVHandle CastedMaxBECount =
getTruncateOrZeroExtend(MaxBECount, Start->getType()); getTruncateOrZeroExtend(MaxBECount, Start->getType());
if (MaxBECount == SCEVHandle RecastedMaxBECount =
getTruncateOrZeroExtend(CastedMaxBECount, MaxBECount->getType())) { getTruncateOrZeroExtend(CastedMaxBECount, MaxBECount->getType());
if (MaxBECount == RecastedMaxBECount) {
const Type *WideTy = const Type *WideTy =
IntegerType::get(getTypeSizeInBits(Start->getType()) * 2); IntegerType::get(getTypeSizeInBits(Start->getType()) * 2);
// Check whether Start+Step*MaxBECount has no signed overflow. // Check whether Start+Step*MaxBECount has no signed overflow.
@@ -900,10 +904,11 @@ SCEVHandle ScalarEvolution::getSignExtendExpr(const SCEVHandle &Op,
getMulExpr(CastedMaxBECount, getMulExpr(CastedMaxBECount,
getTruncateOrSignExtend(Step, Start->getType())); getTruncateOrSignExtend(Step, Start->getType()));
SCEVHandle Add = getAddExpr(Start, SMul); SCEVHandle Add = getAddExpr(Start, SMul);
if (getSignExtendExpr(Add, WideTy) == SCEVHandle OperandExtendedAdd =
getAddExpr(getSignExtendExpr(Start, WideTy), getAddExpr(getSignExtendExpr(Start, WideTy),
getMulExpr(getZeroExtendExpr(CastedMaxBECount, WideTy), getMulExpr(getZeroExtendExpr(CastedMaxBECount, WideTy),
getSignExtendExpr(Step, WideTy)))) getSignExtendExpr(Step, WideTy)));
if (getSignExtendExpr(Add, WideTy) == OperandExtendedAdd)
// Return the expression with the addrec on the outside. // Return the expression with the addrec on the outside.
return getAddRecExpr(getSignExtendExpr(Start, Ty), return getAddRecExpr(getSignExtendExpr(Start, Ty),
getSignExtendExpr(Step, Ty), getSignExtendExpr(Step, Ty),