1 //===-- FPEnv.cpp ---- FP Environment -------------------------------------===//
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 /// @file
10 /// This file contains the implementations of entities that describe floating
11 /// point environment.
12 //
13 //===----------------------------------------------------------------------===//
14
15 #include "llvm/IR/FPEnv.h"
16 #include "llvm/ADT/StringSwitch.h"
17
18 namespace llvm {
19
StrToRoundingMode(StringRef RoundingArg)20 Optional<RoundingMode> StrToRoundingMode(StringRef RoundingArg) {
21 // For dynamic rounding mode, we use round to nearest but we will set the
22 // 'exact' SDNodeFlag so that the value will not be rounded.
23 return StringSwitch<Optional<RoundingMode>>(RoundingArg)
24 .Case("round.dynamic", RoundingMode::Dynamic)
25 .Case("round.tonearest", RoundingMode::NearestTiesToEven)
26 .Case("round.tonearestaway", RoundingMode::NearestTiesToAway)
27 .Case("round.downward", RoundingMode::TowardNegative)
28 .Case("round.upward", RoundingMode::TowardPositive)
29 .Case("round.towardzero", RoundingMode::TowardZero)
30 .Default(None);
31 }
32
RoundingModeToStr(RoundingMode UseRounding)33 Optional<StringRef> RoundingModeToStr(RoundingMode UseRounding) {
34 Optional<StringRef> RoundingStr = None;
35 switch (UseRounding) {
36 case RoundingMode::Dynamic:
37 RoundingStr = "round.dynamic";
38 break;
39 case RoundingMode::NearestTiesToEven:
40 RoundingStr = "round.tonearest";
41 break;
42 case RoundingMode::NearestTiesToAway:
43 RoundingStr = "round.tonearestaway";
44 break;
45 case RoundingMode::TowardNegative:
46 RoundingStr = "round.downward";
47 break;
48 case RoundingMode::TowardPositive:
49 RoundingStr = "round.upward";
50 break;
51 case RoundingMode::TowardZero:
52 RoundingStr = "round.towardzero";
53 break;
54 default:
55 break;
56 }
57 return RoundingStr;
58 }
59
StrToExceptionBehavior(StringRef ExceptionArg)60 Optional<fp::ExceptionBehavior> StrToExceptionBehavior(StringRef ExceptionArg) {
61 return StringSwitch<Optional<fp::ExceptionBehavior>>(ExceptionArg)
62 .Case("fpexcept.ignore", fp::ebIgnore)
63 .Case("fpexcept.maytrap", fp::ebMayTrap)
64 .Case("fpexcept.strict", fp::ebStrict)
65 .Default(None);
66 }
67
ExceptionBehaviorToStr(fp::ExceptionBehavior UseExcept)68 Optional<StringRef> ExceptionBehaviorToStr(fp::ExceptionBehavior UseExcept) {
69 Optional<StringRef> ExceptStr = None;
70 switch (UseExcept) {
71 case fp::ebStrict:
72 ExceptStr = "fpexcept.strict";
73 break;
74 case fp::ebIgnore:
75 ExceptStr = "fpexcept.ignore";
76 break;
77 case fp::ebMayTrap:
78 ExceptStr = "fpexcept.maytrap";
79 break;
80 }
81 return ExceptStr;
82 }
83 } // namespace llvm
84