LLVM: lib/Target/WebAssembly/WebAssemblySetP2AlignOperands.cpp Source File (original) (raw)
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22using namespace llvm;
23
24#define DEBUG_TYPE "wasm-set-p2align-operands"
25
26namespace {
28public:
29 static char ID;
31
32 StringRef getPassName() const override {
33 return "WebAssembly Set p2align Operands";
34 }
35
36 void getAnalysisUsage(AnalysisUsage &AU) const override {
41 }
42
44};
45}
46
47char WebAssemblySetP2AlignOperands::ID = 0;
49 "Set the p2align operands for WebAssembly loads and stores",
50 false, false)
51
53 return new WebAssemblySetP2AlignOperands();
54}
55
57 assert(MI.getOperand(OperandNo).getImm() == 0 &&
58 "ISel should set p2align operands to 0");
59 assert(MI.hasOneMemOperand() &&
60 "Load and store instructions have exactly one mem operand");
61 assert((*MI.memoperands_begin())->getSize() ==
63 "Default p2align value should be natural");
64 assert(MI.getDesc().operands()[OperandNo].OperandType ==
66 "Load and store instructions should have a p2align operand");
67 uint64_t P2Align = Log2((*MI.memoperands_begin())->getAlign());
68
69
70 P2Align = std::min(P2Align,
72
73 MI.getOperand(OperandNo).setImm(P2Align);
74}
75
76bool WebAssemblySetP2AlignOperands::runOnMachineFunction(MachineFunction &MF) {
78 dbgs() << "********** Set p2align Operands **********\n"
79 << "********** Function: " << MF.getName() << '\n';
80 });
81
83
84 for (auto &MBB : MF) {
86 int16_t P2AlignOpNum = WebAssembly::getNamedOperandIdx(
87 MI.getOpcode(), WebAssembly::OpName::p2align);
88 if (P2AlignOpNum != -1) {
91 }
92 }
93 }
94
96}
assert(UImm &&(UImm !=~static_cast< T >(0)) &&"Invalid immediate!")
#define INITIALIZE_PASS(passName, arg, name, cfg, analysis)
This file contains the WebAssembly implementation of the TargetInstrInfo class.
This file provides WebAssembly-specific target descriptions.
static void rewriteP2Align(MachineInstr &MI, unsigned OperandNo)
Definition WebAssemblySetP2AlignOperands.cpp:56
This file contains the entry points for global functions defined in the LLVM WebAssembly back-end.
Represent the analysis usage information of a pass.
AnalysisUsage & addPreservedID(const void *ID)
AnalysisUsage & addPreserved()
Add the specified Pass class to the set of analyses preserved by this pass.
LLVM_ABI void setPreservesCFG()
This function should be called by the pass, iff they do not:
FunctionPass class - This class is used to implement most global optimizations.
MachineFunctionPass - This class adapts the FunctionPass interface to allow convenient creation of pa...
void getAnalysisUsage(AnalysisUsage &AU) const override
getAnalysisUsage - Subclasses that override getAnalysisUsage must call this.
StringRef getName() const
getName - Return the name of the corresponding LLVM function.
Representation of each machine instruction.
StringRef - Represent a constant reference to a string, i.e.
unsigned ID
LLVM IR allows to use arbitrary numbers as calling convention identifiers.
unsigned GetDefaultP2Align(unsigned Opc)
@ OPERAND_P2ALIGN
p2align immediate for load and store address alignment.
This is an optimization pass for GlobalISel generic memory operations.
LLVM_ABI char & MachineDominatorsID
MachineDominators - This pass is a machine dominators analysis pass.
LLVM_ABI raw_ostream & dbgs()
dbgs() - This returns a reference to a raw_ostream for debugging messages.
FunctionPass * createWebAssemblySetP2AlignOperands()
unsigned Log2(Align A)
Returns the log2 of the alignment.