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author | Michael Ilseman <milseman@apple.com> | 2012-12-13 03:13:36 +0000 |
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committer | Michael Ilseman <milseman@apple.com> | 2012-12-13 03:13:36 +0000 |
commit | 8ad435fa4809b5a4ad1043435cbafd5c9ddf2d93 (patch) | |
tree | 5f709278a848a9e2e7efa140dfa6aa73f7d467e3 /lib/Transforms/InstCombine/InstCombineCalls.cpp | |
parent | 05fa24c5749da265ee9f82eeead8ccdf2804f721 (diff) | |
download | llvm-8ad435fa4809b5a4ad1043435cbafd5c9ddf2d93.tar.gz llvm-8ad435fa4809b5a4ad1043435cbafd5c9ddf2d93.tar.bz2 llvm-8ad435fa4809b5a4ad1043435cbafd5c9ddf2d93.tar.xz |
Pattern matching code for intrinsics.
Provides m_Argument that allows matching against a CallSite's specified argument. Provides m_Intrinsic pattern that can be templatized over the intrinsic id and bind/match arguments similarly to other pattern matchers. Implementations provided for 0 to 4 arguments, though it's very simple to extend for more. Also provides example template specialization for bswap (m_BSwap) and example of code cleanup for its use.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@170091 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Transforms/InstCombine/InstCombineCalls.cpp')
-rw-r--r-- | lib/Transforms/InstCombine/InstCombineCalls.cpp | 32 |
1 files changed, 17 insertions, 15 deletions
diff --git a/lib/Transforms/InstCombine/InstCombineCalls.cpp b/lib/Transforms/InstCombine/InstCombineCalls.cpp index 8cd9409f5e..ba4a57329d 100644 --- a/lib/Transforms/InstCombine/InstCombineCalls.cpp +++ b/lib/Transforms/InstCombine/InstCombineCalls.cpp @@ -16,9 +16,11 @@ #include "llvm/Analysis/MemoryBuiltins.h" #include "llvm/DataLayout.h" #include "llvm/Support/CallSite.h" +#include "llvm/Support/PatternMatch.h" #include "llvm/Transforms/Utils/BuildLibCalls.h" #include "llvm/Transforms/Utils/Local.h" using namespace llvm; +using namespace PatternMatch; STATISTIC(NumSimplified, "Number of library calls simplified"); @@ -276,25 +278,25 @@ Instruction *InstCombiner::visitCallInst(CallInst &CI) { return ReplaceInstUsesWith(CI, ConstantInt::get(CI.getType(), Size)); return 0; } - case Intrinsic::bswap: + case Intrinsic::bswap: { + Value *IIOperand = II->getArgOperand(0); + Value *X = 0; + // bswap(bswap(x)) -> x - if (IntrinsicInst *Operand = dyn_cast<IntrinsicInst>(II->getArgOperand(0))) - if (Operand->getIntrinsicID() == Intrinsic::bswap) - return ReplaceInstUsesWith(CI, Operand->getArgOperand(0)); + if (match(IIOperand, m_BSwap(m_Value(X)))) + return ReplaceInstUsesWith(CI, X); // bswap(trunc(bswap(x))) -> trunc(lshr(x, c)) - if (TruncInst *TI = dyn_cast<TruncInst>(II->getArgOperand(0))) { - if (IntrinsicInst *Operand = dyn_cast<IntrinsicInst>(TI->getOperand(0))) - if (Operand->getIntrinsicID() == Intrinsic::bswap) { - unsigned C = Operand->getType()->getPrimitiveSizeInBits() - - TI->getType()->getPrimitiveSizeInBits(); - Value *CV = ConstantInt::get(Operand->getType(), C); - Value *V = Builder->CreateLShr(Operand->getArgOperand(0), CV); - return new TruncInst(V, TI->getType()); - } + if (match(IIOperand, m_Trunc(m_BSwap(m_Value(X))))) { + unsigned C = X->getType()->getPrimitiveSizeInBits() - + IIOperand->getType()->getPrimitiveSizeInBits(); + Value *CV = ConstantInt::get(X->getType(), C); + Value *V = Builder->CreateLShr(X, CV); + return new TruncInst(V, IIOperand->getType()); } - break; + } + case Intrinsic::powi: if (ConstantInt *Power = dyn_cast<ConstantInt>(II->getArgOperand(1))) { // powi(x, 0) -> 1.0 @@ -693,7 +695,7 @@ Instruction *InstCombiner::visitCallInst(CallInst &CI) { if (Splat->isOne()) { if (Zext) return CastInst::CreateZExtOrBitCast(Arg0, II->getType()); - // else + // else return CastInst::CreateSExtOrBitCast(Arg0, II->getType()); } } |