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 
18 namespace llvm {
19 
20 Optional<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 
32 Optional<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 
54 Optional<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 
62 Optional<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 }