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

   1 //=== lib/builtins/loongarch/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 LOONGARCH_TONEAREST  0x0000
  11 #define LOONGARCH_TOWARDZERO 0x0100
  12 #define LOONGARCH_UPWARD     0x0200
  13 #define LOONGARCH_DOWNWARD   0x0300
  14
  15 #define LOONGARCH_RMODE_MASK (LOONGARCH_TONEAREST | LOONGARCH_TOWARDZERO | \
  16                               LOONGARCH_UPWARD | LOONGARCH_DOWNWARD)
  17
  18 #define LOONGARCH_INEXACT    0x10000
  19
  20 CRT_FE_ROUND_MODE __fe_getround(void) {
  21 #if __loongarch_frlen != 0
  22   int fcsr;
  23 #  ifdef __clang__
  24   __asm__ __volatile__("movfcsr2gr %0, $fcsr0" : "=r" (fcsr));
  25 #  else
  26   __asm__ __volatile__("movfcsr2gr %0, $r0" : "=r" (fcsr));
  27 #  endif
  28   fcsr &= LOONGARCH_RMODE_MASK;
  29   switch (fcsr) {
  30   case LOONGARCH_TOWARDZERO:
  31     return CRT_FE_TOWARDZERO;
  32   case LOONGARCH_DOWNWARD:
  33     return CRT_FE_DOWNWARD;
  34   case LOONGARCH_UPWARD:
  35     return CRT_FE_UPWARD;
  36   case LOONGARCH_TONEAREST:
  37   default:
  38     return CRT_FE_TONEAREST;
  39   }
  40 #else
  41   return CRT_FE_TONEAREST;
  42 #endif
  43 }
  44
  45 int __fe_raise_inexact(void) {
  46 #if __loongarch_frlen != 0
  47   int fcsr;
  48 #  ifdef __clang__
  49   __asm__ __volatile__("movfcsr2gr %0, $fcsr0" : "=r" (fcsr));
  50   __asm__ __volatile__(
  51       "movgr2fcsr $fcsr0, %0" :: "r" (fcsr | LOONGARCH_INEXACT));
  52 #  else
  53   __asm__ __volatile__("movfcsr2gr %0, $r0" : "=r" (fcsr));
  54   __asm__ __volatile__(
  55       "movgr2fcsr $r0, %0" :: "r" (fcsr | LOONGARCH_INEXACT));
  56 #  endif
  57 #endif
  58   return 0;
  59 }