LLVM  10.0.0svn
RISCVMatInt.h
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1 //===- RISCVMatInt.h - Immediate materialisation ---------------*- C++ -*--===//
2 //
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
6 //
7 //===----------------------------------------------------------------------===//
8 
9 #ifndef LLVM_LIB_TARGET_RISCV_MATINT_H
10 #define LLVM_LIB_TARGET_RISCV_MATINT_H
11 
12 #include "llvm/ADT/APInt.h"
13 #include "llvm/ADT/SmallVector.h"
15 #include <cstdint>
16 
17 namespace llvm {
18 
19 namespace RISCVMatInt {
20 struct Inst {
21  unsigned Opc;
22  int64_t Imm;
23 
24  Inst(unsigned Opc, int64_t Imm) : Opc(Opc), Imm(Imm) {}
25 };
27 
28 // Helper to generate an instruction sequence that will materialise the given
29 // immediate value into a register. A sequence of instructions represented by
30 // a simple struct produced rather than directly emitting the instructions in
31 // order to allow this helper to be used from both the MC layer and during
32 // instruction selection.
33 void generateInstSeq(int64_t Val, bool IsRV64, InstSeq &Res);
34 
35 // Helper to estimate the number of instructions required to materialise the
36 // given immediate value into a register. This estimate does not account for
37 // `Val` possibly fitting into an immediate, and so may over-estimate.
38 //
39 // This will attempt to produce instructions to materialise `Val` as an
40 // `Size`-bit immediate. `IsRV64` should match the target architecture.
41 int getIntMatCost(const APInt &Val, unsigned Size, bool IsRV64);
42 } // namespace RISCVMatInt
43 } // namespace llvm
44 #endif
This class represents lattice values for constants.
Definition: AllocatorList.h:23
This file implements a class to represent arbitrary precision integral constant values and operations...
Inst(unsigned Opc, int64_t Imm)
Definition: RISCVMatInt.h:24
This is a &#39;vector&#39; (really, a variable-sized array), optimized for the case when the array is small...
Definition: SmallVector.h:837
Class for arbitrary precision integers.
Definition: APInt.h:69
int getIntMatCost(const APInt &Val, unsigned Size, bool IsRV64)
Definition: RISCVMatInt.cpp:78
void generateInstSeq(int64_t Val, bool IsRV64, InstSeq &Res)
Definition: RISCVMatInt.cpp:19
uint32_t Size
Definition: Profile.cpp:46