[LIR] Refactor code to enable future patch. NFC.
llvm-svn: 256159
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@ -256,6 +256,47 @@ static unsigned getStoreStride(const SCEVAddRecExpr *StoreEv) {
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return ConstStride->getAPInt().getZExtValue();
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}
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/// getMemSetPatternValue - If a strided store of the specified value is safe to
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/// turn into a memset_pattern16, return a ConstantArray of 16 bytes that should
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/// be passed in. Otherwise, return null.
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///
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/// Note that we don't ever attempt to use memset_pattern8 or 4, because these
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/// just replicate their input array and then pass on to memset_pattern16.
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static Constant *getMemSetPatternValue(Value *V, const DataLayout *DL) {
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// If the value isn't a constant, we can't promote it to being in a constant
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// array. We could theoretically do a store to an alloca or something, but
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// that doesn't seem worthwhile.
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Constant *C = dyn_cast<Constant>(V);
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if (!C)
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return nullptr;
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// Only handle simple values that are a power of two bytes in size.
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uint64_t Size = DL->getTypeSizeInBits(V->getType());
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if (Size == 0 || (Size & 7) || (Size & (Size - 1)))
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return nullptr;
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// Don't care enough about darwin/ppc to implement this.
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if (DL->isBigEndian())
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return nullptr;
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// Convert to size in bytes.
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Size /= 8;
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// TODO: If CI is larger than 16-bytes, we can try slicing it in half to see
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// if the top and bottom are the same (e.g. for vectors and large integers).
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if (Size > 16)
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return nullptr;
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// If the constant is exactly 16 bytes, just use it.
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if (Size == 16)
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return C;
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// Otherwise, we'll use an array of the constants.
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unsigned ArraySize = 16 / Size;
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ArrayType *AT = ArrayType::get(V->getType(), ArraySize);
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return ConstantArray::get(AT, std::vector<Constant *>(ArraySize, C));
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}
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bool LoopIdiomRecognize::isLegalStore(StoreInst *SI) {
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// Don't touch volatile stores.
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if (!SI->isSimple())
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@ -436,47 +477,6 @@ static bool mayLoopAccessLocation(Value *Ptr, ModRefInfo Access, Loop *L,
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return false;
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}
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/// getMemSetPatternValue - If a strided store of the specified value is safe to
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/// turn into a memset_pattern16, return a ConstantArray of 16 bytes that should
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/// be passed in. Otherwise, return null.
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///
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/// Note that we don't ever attempt to use memset_pattern8 or 4, because these
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/// just replicate their input array and then pass on to memset_pattern16.
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static Constant *getMemSetPatternValue(Value *V, const DataLayout *DL) {
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// If the value isn't a constant, we can't promote it to being in a constant
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// array. We could theoretically do a store to an alloca or something, but
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// that doesn't seem worthwhile.
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Constant *C = dyn_cast<Constant>(V);
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if (!C)
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return nullptr;
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// Only handle simple values that are a power of two bytes in size.
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uint64_t Size = DL->getTypeSizeInBits(V->getType());
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if (Size == 0 || (Size & 7) || (Size & (Size - 1)))
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return nullptr;
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// Don't care enough about darwin/ppc to implement this.
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if (DL->isBigEndian())
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return nullptr;
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// Convert to size in bytes.
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Size /= 8;
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// TODO: If CI is larger than 16-bytes, we can try slicing it in half to see
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// if the top and bottom are the same (e.g. for vectors and large integers).
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if (Size > 16)
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return nullptr;
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// If the constant is exactly 16 bytes, just use it.
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if (Size == 16)
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return C;
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// Otherwise, we'll use an array of the constants.
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unsigned ArraySize = 16 / Size;
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ArrayType *AT = ArrayType::get(V->getType(), ArraySize);
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return ConstantArray::get(AT, std::vector<Constant *>(ArraySize, C));
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}
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// If we have a negative stride, Start refers to the end of the memory location
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// we're trying to memset. Therefore, we need to recompute the base pointer,
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// which is just Start - BECount*Size.
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