compiler-rt/lib/builtins/riscv/fp_mode.c

   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 }