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| author | Nuno Lopes <nunoplopes@sapo.pt> | 2012-05-15 20:20:14 +0000 |
|---|---|---|
| committer | Nuno Lopes <nunoplopes@sapo.pt> | 2012-05-15 20:20:14 +0000 |
| commit | ac94bd88d8bcd15305500dc06bc65bcecf2aafeb (patch) | |
| tree | 117032596955f9042783ef281cd5d96e1935dcd8 /lib | |
| parent | 94b62ac5f3b2732251f164ee6feab2dd1a4b967f (diff) | |
| download | llvm-ac94bd88d8bcd15305500dc06bc65bcecf2aafeb.tar.gz llvm-ac94bd88d8bcd15305500dc06bc65bcecf2aafeb.tar.bz2 llvm-ac94bd88d8bcd15305500dc06bc65bcecf2aafeb.tar.xz | |
reuse the result of some expensive computations in getSignExtendExpr() and getZeroExtendExpr()
this gives a speedup of > 80 in a debug build in the test case of PR12825 (php_sha512_crypt_r)
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@156849 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/Analysis/ScalarEvolution.cpp | 38 |
1 files changed, 20 insertions, 18 deletions
diff --git a/lib/Analysis/ScalarEvolution.cpp b/lib/Analysis/ScalarEvolution.cpp index 5489ef1d70..d1ad8e02d6 100644 --- a/lib/Analysis/ScalarEvolution.cpp +++ b/lib/Analysis/ScalarEvolution.cpp @@ -974,12 +974,15 @@ const SCEV *ScalarEvolution::getZeroExtendExpr(const SCEV *Op, Type *WideTy = IntegerType::get(getContext(), BitWidth * 2); // Check whether Start+Step*MaxBECount has no unsigned overflow. const SCEV *ZMul = getMulExpr(CastedMaxBECount, Step); - const SCEV *Add = getAddExpr(Start, ZMul); + const SCEV *ZAdd = getZeroExtendExpr(getAddExpr(Start, ZMul), WideTy); + const SCEV *WideStart = getZeroExtendExpr(Start, WideTy); + const SCEV *WideMaxBECount = + getZeroExtendExpr(CastedMaxBECount, WideTy); const SCEV *OperandExtendedAdd = - getAddExpr(getZeroExtendExpr(Start, WideTy), - getMulExpr(getZeroExtendExpr(CastedMaxBECount, WideTy), + getAddExpr(WideStart, + getMulExpr(WideMaxBECount, getZeroExtendExpr(Step, WideTy))); - if (getZeroExtendExpr(Add, WideTy) == OperandExtendedAdd) { + if (ZAdd == OperandExtendedAdd) { // Cache knowledge of AR NUW, which is propagated to this AddRec. const_cast<SCEVAddRecExpr *>(AR)->setNoWrapFlags(SCEV::FlagNUW); // Return the expression with the addrec on the outside. @@ -989,13 +992,11 @@ const SCEV *ScalarEvolution::getZeroExtendExpr(const SCEV *Op, } // Similar to above, only this time treat the step value as signed. // This covers loops that count down. - const SCEV *SMul = getMulExpr(CastedMaxBECount, Step); - Add = getAddExpr(Start, SMul); OperandExtendedAdd = - getAddExpr(getZeroExtendExpr(Start, WideTy), - getMulExpr(getZeroExtendExpr(CastedMaxBECount, WideTy), + getAddExpr(WideStart, + getMulExpr(WideMaxBECount, getSignExtendExpr(Step, WideTy))); - if (getZeroExtendExpr(Add, WideTy) == OperandExtendedAdd) { + if (ZAdd == OperandExtendedAdd) { // Cache knowledge of AR NW, which is propagated to this AddRec. // Negative step causes unsigned wrap, but it still can't self-wrap. const_cast<SCEVAddRecExpr *>(AR)->setNoWrapFlags(SCEV::FlagNW); @@ -1239,12 +1240,15 @@ const SCEV *ScalarEvolution::getSignExtendExpr(const SCEV *Op, Type *WideTy = IntegerType::get(getContext(), BitWidth * 2); // Check whether Start+Step*MaxBECount has no signed overflow. const SCEV *SMul = getMulExpr(CastedMaxBECount, Step); - const SCEV *Add = getAddExpr(Start, SMul); + const SCEV *SAdd = getSignExtendExpr(getAddExpr(Start, SMul), WideTy); + const SCEV *WideStart = getSignExtendExpr(Start, WideTy); + const SCEV *WideMaxBECount = + getZeroExtendExpr(CastedMaxBECount, WideTy); const SCEV *OperandExtendedAdd = - getAddExpr(getSignExtendExpr(Start, WideTy), - getMulExpr(getZeroExtendExpr(CastedMaxBECount, WideTy), + getAddExpr(WideStart, + getMulExpr(WideMaxBECount, getSignExtendExpr(Step, WideTy))); - if (getSignExtendExpr(Add, WideTy) == OperandExtendedAdd) { + if (SAdd == OperandExtendedAdd) { // Cache knowledge of AR NSW, which is propagated to this AddRec. const_cast<SCEVAddRecExpr *>(AR)->setNoWrapFlags(SCEV::FlagNSW); // Return the expression with the addrec on the outside. @@ -1254,13 +1258,11 @@ const SCEV *ScalarEvolution::getSignExtendExpr(const SCEV *Op, } // Similar to above, only this time treat the step value as unsigned. // This covers loops that count up with an unsigned step. - const SCEV *UMul = getMulExpr(CastedMaxBECount, Step); - Add = getAddExpr(Start, UMul); OperandExtendedAdd = - getAddExpr(getSignExtendExpr(Start, WideTy), - getMulExpr(getZeroExtendExpr(CastedMaxBECount, WideTy), + getAddExpr(WideStart, + getMulExpr(WideMaxBECount, getZeroExtendExpr(Step, WideTy))); - if (getSignExtendExpr(Add, WideTy) == OperandExtendedAdd) { + if (SAdd == OperandExtendedAdd) { // Cache knowledge of AR NSW, which is propagated to this AddRec. const_cast<SCEVAddRecExpr *>(AR)->setNoWrapFlags(SCEV::FlagNSW); // Return the expression with the addrec on the outside. |