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
|
/*========================== begin_copyright_notice ============================
Copyright (C) 2017-2021 Intel Corporation
SPDX-License-Identifier: MIT
============================= end_copyright_notice ===========================*/
#pragma once
#include "Compiler/MetaDataUtilsWrapper.h"
#include "common/LLVMWarningsPush.hpp"
#include <llvm/Pass.h>
#include <llvm/IR/InstVisitor.h>
#include "common/LLVMWarningsPop.hpp"
namespace IGC
{
/// @brief if the proper compiler option is present, makes sure usages of single precision floating point
/// sqrt and divide are IEEE compliant, otherwise does nothing.
/// Achieved by replacing div and sqrt with calls to compliant versions.
class CorrectlyRoundedDivSqrt : public llvm::ModulePass, public llvm::InstVisitor<CorrectlyRoundedDivSqrt>
{
public:
/// @brief Pass identification.
static char ID;
CorrectlyRoundedDivSqrt();
CorrectlyRoundedDivSqrt(bool forceCR, bool HasHalf);
~CorrectlyRoundedDivSqrt() {}
virtual llvm::StringRef getPassName() const override
{
return "CorrectlyRoundedDivSqrt";
}
virtual bool runOnModule(llvm::Module& M) override;
virtual void getAnalysisUsage(llvm::AnalysisUsage& AU) const override
{
AU.setPreservesCFG();
AU.addRequired<MetaDataUtilsWrapper>();
}
/// @brief replace given divide instruction with a call to a correctly rounded version.
/// @param I - the fdiv instruction.
void visitFDiv(llvm::BinaryOperator& I);
private:
/// @brief if the given function is a sqrt function, replace the declaration with a correctly rounded version.
/// @param F - the function.
/// @return true if the function was changed.
static bool processDeclaration(llvm::Function& F);
llvm::Value* emitIEEEDivide(llvm::BinaryOperator* I, llvm::Value* Op0, llvm::Value* Op1);
/// @brief Indicates if the pass changed the processed function
bool m_changed;
/// @brief Indicates that correctly rounded sqrt/div should be used even
/// when the option is not present in the module metadata.
bool m_forceCR;
bool m_hasHalfTy;
bool m_IsCorrectlyRounded;
llvm::Module* m_module = nullptr;
};
} // namespace IGC
|
