1//=== lib/builtins/riscv/fp_mode.c - Floaing-point mode utilities -*- C -*-===//
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#include "../fp_mode.h"
9
10#define RISCV_TONEAREST 0x0
11#define RISCV_TOWARDZERO 0x1
12#define RISCV_DOWNWARD 0x2
13#define RISCV_UPWARD 0x3
14
15#define RISCV_INEXACT 0x1
16
17CRT_FE_ROUND_MODE __fe_getround(void) {
18#if defined(__riscv_f) || defined(__riscv_zfinx)
19 int frm;
20 __asm__ __volatile__("frrm %0" : "=r" (frm));
21 switch (frm) {
22 case RISCV_TOWARDZERO:
23 return CRT_FE_TOWARDZERO;
24 case RISCV_DOWNWARD:
25 return CRT_FE_DOWNWARD;
26 case RISCV_UPWARD:
27 return CRT_FE_UPWARD;
28 case RISCV_TONEAREST:
29 default:
30 return CRT_FE_TONEAREST;
31 }
32#else
33 return CRT_FE_TONEAREST;
34#endif
35}
36
37int __fe_raise_inexact(void) {
38#if defined(__riscv_f) || defined(__riscv_zfinx)
39 __asm__ __volatile__("csrsi fflags, %0" :: "i" (RISCV_INEXACT));
40#endif
41 return 0;
42}
43

source code of compiler-rt/lib/builtins/riscv/fp_mode.c