blob: 4ebea68c58a5fe9b7ee8a706e24308625c166b18 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
|
//=- WebAssemblySetP2AlignOperands.cpp - Set alignments on loads and stores -=//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
///
/// \file
/// \brief This file sets the p2align operands on load and store instructions.
///
//===----------------------------------------------------------------------===//
#include "WebAssembly.h"
#include "MCTargetDesc/WebAssemblyMCTargetDesc.h"
#include "WebAssemblyMachineFunctionInfo.h"
#include "llvm/CodeGen/MachineBlockFrequencyInfo.h"
#include "llvm/CodeGen/MachineMemOperand.h"
#include "llvm/CodeGen/Passes.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/raw_ostream.h"
using namespace llvm;
#define DEBUG_TYPE "wasm-set-p2align-operands"
namespace {
class WebAssemblySetP2AlignOperands final : public MachineFunctionPass {
public:
static char ID; // Pass identification, replacement for typeid
WebAssemblySetP2AlignOperands() : MachineFunctionPass(ID) {}
const char *getPassName() const override {
return "WebAssembly Set p2align Operands";
}
void getAnalysisUsage(AnalysisUsage &AU) const override {
AU.setPreservesCFG();
AU.addPreserved<MachineBlockFrequencyInfo>();
AU.addPreservedID(MachineDominatorsID);
MachineFunctionPass::getAnalysisUsage(AU);
}
bool runOnMachineFunction(MachineFunction &MF) override;
};
} // end anonymous namespace
char WebAssemblySetP2AlignOperands::ID = 0;
FunctionPass *llvm::createWebAssemblySetP2AlignOperands() {
return new WebAssemblySetP2AlignOperands();
}
bool WebAssemblySetP2AlignOperands::runOnMachineFunction(MachineFunction &MF) {
DEBUG({
dbgs() << "********** Set p2align Operands **********\n"
<< "********** Function: " << MF.getName() << '\n';
});
bool Changed = false;
for (auto &MBB : MF) {
for (auto &MI : MBB) {
switch (MI.getOpcode()) {
case WebAssembly::LOAD_I32:
case WebAssembly::LOAD_I64:
case WebAssembly::LOAD_F32:
case WebAssembly::LOAD_F64:
case WebAssembly::LOAD8_S_I32:
case WebAssembly::LOAD8_U_I32:
case WebAssembly::LOAD16_S_I32:
case WebAssembly::LOAD16_U_I32:
case WebAssembly::LOAD8_S_I64:
case WebAssembly::LOAD8_U_I64:
case WebAssembly::LOAD16_S_I64:
case WebAssembly::LOAD16_U_I64:
case WebAssembly::LOAD32_S_I64:
case WebAssembly::LOAD32_U_I64:
case WebAssembly::STORE_I32:
case WebAssembly::STORE_I64:
case WebAssembly::STORE_F32:
case WebAssembly::STORE_F64:
case WebAssembly::STORE8_I32:
case WebAssembly::STORE16_I32:
case WebAssembly::STORE8_I64:
case WebAssembly::STORE16_I64:
case WebAssembly::STORE32_I64: {
assert(MI.getOperand(3).getImm() == 0 &&
"ISel should set p2align operands to 0");
assert(MI.hasOneMemOperand() &&
"Load and store instructions have exactly one mem operand");
assert((*MI.memoperands_begin())->getSize() ==
(UINT64_C(1)
<< WebAssembly::GetDefaultP2Align(MI.getOpcode())) &&
"Default p2align value should be natural");
assert(MI.getDesc().OpInfo[3].OperandType ==
WebAssembly::OPERAND_P2ALIGN &&
"Load and store instructions should have a p2align operand");
uint64_t P2Align = Log2_64((*MI.memoperands_begin())->getAlignment());
// WebAssembly does not currently support supernatural alignment.
P2Align = std::min(
P2Align, uint64_t(WebAssembly::GetDefaultP2Align(MI.getOpcode())));
MI.getOperand(3).setImm(P2Align);
break;
}
default:
break;
}
}
}
return Changed;
}
|
