FPEnv.cpp revision 360784 
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/ADT/StringSwitch.h"
16#include "llvm/IR/FPEnv.h"
17
18namespace llvm {
19
20Optional<fp::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<fp::RoundingMode>>(RoundingArg)
24      .Case("round.dynamic", fp::rmDynamic)
25      .Case("round.tonearest", fp::rmToNearest)
26      .Case("round.downward", fp::rmDownward)
27      .Case("round.upward", fp::rmUpward)
28      .Case("round.towardzero", fp::rmTowardZero)
29      .Default(None);
30}
31
32Optional<StringRef> RoundingModeToStr(fp::RoundingMode UseRounding) {
33  Optional<StringRef> RoundingStr = None;
34  switch (UseRounding) {
35  case fp::rmDynamic:
36    RoundingStr = "round.dynamic";
37    break;
38  case fp::rmToNearest:
39    RoundingStr = "round.tonearest";
40    break;
41  case fp::rmDownward:
42    RoundingStr = "round.downward";
43    break;
44  case fp::rmUpward:
45    RoundingStr = "round.upward";
46    break;
47  case fp::rmTowardZero:
48    RoundingStr = "round.towardzero";
49    break;
50  }
51  return RoundingStr;
52}
53
54Optional<fp::ExceptionBehavior> StrToExceptionBehavior(StringRef ExceptionArg) {
55  return StringSwitch<Optional<fp::ExceptionBehavior>>(ExceptionArg)
56      .Case("fpexcept.ignore", fp::ebIgnore)
57      .Case("fpexcept.maytrap", fp::ebMayTrap)
58      .Case("fpexcept.strict", fp::ebStrict)
59      .Default(None);
60}
61
62Optional<StringRef> ExceptionBehaviorToStr(fp::ExceptionBehavior UseExcept) {
63  Optional<StringRef> ExceptStr = None;
64  switch (UseExcept) {
65  case fp::ebStrict:
66    ExceptStr = "fpexcept.strict";
67    break;
68  case fp::ebIgnore:
69    ExceptStr = "fpexcept.ignore";
70    break;
71  case fp::ebMayTrap:
72    ExceptStr = "fpexcept.maytrap";
73    break;
74  }
75  return ExceptStr;
76}
77
78}