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 
17 CRT_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 
37 int __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