#include "llvm/IntrinsicInst.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/IRBuilder.h"
#include <cstring>
using namespace llvm;
// Calls to these intrinsics are transformed into vector multiplies.
NewFn = 0;
return true;
+ } else if (Name.compare(5, 18, "x86.ssse3.palign.r", 18) == 0 ||
+ Name.compare(5, 22, "x86.ssse3.palign.r.128", 22) == 0) {
+ // Calls to these intrinsics are transformed into vector shuffles, shifts,
+ // or 0.
+ NewFn = 0;
+ return true;
}
-
break;
}
// Remove upgraded multiply.
CI->eraseFromParent();
+ } else if (F->getName() == "llvm.x86.ssse3.palign.r") {
+ Value *Op1 = CI->getOperand(1);
+ Value *Op2 = CI->getOperand(2);
+ Value *Op3 = CI->getOperand(3);
+ unsigned shiftVal = cast<ConstantInt>(Op3)->getZExtValue();
+ Value *Rep;
+ IRBuilder<> Builder(C);
+ Builder.SetInsertPoint(CI->getParent(), CI);
+
+ // If palignr is shifting the pair of input vectors less than 9 bytes,
+ // emit a shuffle instruction.
+ if (shiftVal <= 8) {
+ const Type *IntTy = Type::getInt32Ty(C);
+ const Type *EltTy = Type::getInt8Ty(C);
+ const Type *VecTy = VectorType::get(EltTy, 8);
+
+ Op2 = Builder.CreateBitCast(Op2, VecTy);
+ Op1 = Builder.CreateBitCast(Op1, VecTy);
+
+ llvm::SmallVector<llvm::Constant*, 8> Indices;
+ for (unsigned i = 0; i != 8; ++i)
+ Indices.push_back(ConstantInt::get(IntTy, shiftVal + i));
+
+ Value *SV = ConstantVector::get(Indices.begin(), Indices.size());
+ Rep = Builder.CreateShuffleVector(Op2, Op1, SV, "palignr");
+ Rep = Builder.CreateBitCast(Rep, F->getReturnType());
+ }
+
+ // If palignr is shifting the pair of input vectors more than 8 but less
+ // than 16 bytes, emit a logical right shift of the destination.
+ else if (shiftVal < 16) {
+ // MMX has these as 1 x i64 vectors for some odd optimization reasons.
+ const Type *EltTy = Type::getInt64Ty(C);
+ const Type *VecTy = VectorType::get(EltTy, 1);
+
+ Op1 = Builder.CreateBitCast(Op1, VecTy, "cast");
+ Op2 = ConstantInt::get(VecTy, (shiftVal-8) * 8);
+
+ // create i32 constant
+ Function *I =
+ Intrinsic::getDeclaration(F->getParent(), Intrinsic::x86_mmx_psrl_q);
+ Rep = Builder.CreateCall2(I, Op1, Op2, "palignr");
+ }
+
+ // If palignr is shifting the pair of vectors more than 32 bytes, emit zero.
+ else {
+ Rep = Constant::getNullValue(F->getReturnType());
+ }
+
+ // Replace any uses with our new instruction.
+ if (!CI->use_empty())
+ CI->replaceAllUsesWith(Rep);
+
+ // Remove upgraded instruction.
+ CI->eraseFromParent();
+
+ } else if (F->getName() == "llvm.x86.ssse3.palign.r.128") {
+ Value *Op1 = CI->getOperand(1);
+ Value *Op2 = CI->getOperand(2);
+ Value *Op3 = CI->getOperand(3);
+ unsigned shiftVal = cast<ConstantInt>(Op3)->getZExtValue();
+ Value *Rep;
+ IRBuilder<> Builder(C);
+ Builder.SetInsertPoint(CI->getParent(), CI);
+
+ // If palignr is shifting the pair of input vectors less than 17 bytes,
+ // emit a shuffle instruction.
+ if (shiftVal <= 16) {
+ const Type *IntTy = Type::getInt32Ty(C);
+ const Type *EltTy = Type::getInt8Ty(C);
+ const Type *VecTy = VectorType::get(EltTy, 16);
+
+ Op2 = Builder.CreateBitCast(Op2, VecTy);
+ Op1 = Builder.CreateBitCast(Op1, VecTy);
+
+ llvm::SmallVector<llvm::Constant*, 16> Indices;
+ for (unsigned i = 0; i != 16; ++i)
+ Indices.push_back(ConstantInt::get(IntTy, shiftVal + i));
+
+ Value *SV = ConstantVector::get(Indices.begin(), Indices.size());
+ Rep = Builder.CreateShuffleVector(Op2, Op1, SV, "palignr");
+ Rep = Builder.CreateBitCast(Rep, F->getReturnType());
+ }
+
+ // If palignr is shifting the pair of input vectors more than 16 but less
+ // than 32 bytes, emit a logical right shift of the destination.
+ else if (shiftVal < 32) {
+ const Type *EltTy = Type::getInt64Ty(C);
+ const Type *VecTy = VectorType::get(EltTy, 2);
+ const Type *IntTy = Type::getInt32Ty(C);
+
+ Op1 = Builder.CreateBitCast(Op1, VecTy, "cast");
+ Op2 = ConstantInt::get(IntTy, (shiftVal-16) * 8);
+
+ // create i32 constant
+ Function *I =
+ Intrinsic::getDeclaration(F->getParent(), Intrinsic::x86_sse2_psrl_dq);
+ Rep = Builder.CreateCall2(I, Op1, Op2, "palignr");
+ }
+
+ // If palignr is shifting the pair of vectors more than 32 bytes, emit zero.
+ else {
+ Rep = Constant::getNullValue(F->getReturnType());
+ }
+
+ // Replace any uses with our new instruction.
+ if (!CI->use_empty())
+ CI->replaceAllUsesWith(Rep);
+
+ // Remove upgraded instruction.
+ CI->eraseFromParent();
+
} else {
llvm_unreachable("Unknown function for CallInst upgrade.");
}