1 //===-- WebAssemblyTargetTransformInfo.cpp - WebAssembly-specific TTI -----===//
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7 //===----------------------------------------------------------------------===//
10 /// This file defines the WebAssembly-specific TargetTransformInfo
13 //===----------------------------------------------------------------------===//
15 #include "WebAssemblyTargetTransformInfo.h"
16 #include "llvm/CodeGen/CostTable.h"
17 #include "llvm/Support/Debug.h"
20 #define DEBUG_TYPE "wasmtti"
22 TargetTransformInfo::PopcntSupportKind
23 WebAssemblyTTIImpl::getPopcntSupport(unsigned TyWidth
) const {
24 assert(isPowerOf2_32(TyWidth
) && "Ty width must be power of 2");
25 return TargetTransformInfo::PSK_FastHardware
;
28 unsigned WebAssemblyTTIImpl::getNumberOfRegisters(bool Vector
) {
29 unsigned Result
= BaseT::getNumberOfRegisters(Vector
);
31 // For SIMD, use at least 16 registers, as a rough guess.
33 Result
= std::max(Result
, 16u);
38 unsigned WebAssemblyTTIImpl::getRegisterBitWidth(bool Vector
) const {
39 if (Vector
&& getST()->hasSIMD128())
45 unsigned WebAssemblyTTIImpl::getArithmeticInstrCost(
46 unsigned Opcode
, Type
*Ty
, TTI::OperandValueKind Opd1Info
,
47 TTI::OperandValueKind Opd2Info
, TTI::OperandValueProperties Opd1PropInfo
,
48 TTI::OperandValueProperties Opd2PropInfo
, ArrayRef
<const Value
*> Args
) {
50 unsigned Cost
= BasicTTIImplBase
<WebAssemblyTTIImpl
>::getArithmeticInstrCost(
51 Opcode
, Ty
, Opd1Info
, Opd2Info
, Opd1PropInfo
, Opd2PropInfo
);
53 if (auto *VTy
= dyn_cast
<VectorType
>(Ty
)) {
55 case Instruction::LShr
:
56 case Instruction::AShr
:
57 case Instruction::Shl
:
58 // SIMD128's shifts currently only accept a scalar shift count. For each
59 // element, we'll need to extract, op, insert. The following is a rough
61 if (Opd2Info
!= TTI::OK_UniformValue
&&
62 Opd2Info
!= TTI::OK_UniformConstantValue
)
63 Cost
= VTy
->getNumElements() *
64 (TargetTransformInfo::TCC_Basic
+
65 getArithmeticInstrCost(Opcode
, VTy
->getElementType()) +
66 TargetTransformInfo::TCC_Basic
);
73 unsigned WebAssemblyTTIImpl::getVectorInstrCost(unsigned Opcode
, Type
*Val
,
75 unsigned Cost
= BasicTTIImplBase::getVectorInstrCost(Opcode
, Val
, Index
);
77 // SIMD128's insert/extract currently only take constant indices.
79 return Cost
+ 25 * TargetTransformInfo::TCC_Expensive
;