60 lines · 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-exception6//7//===----------------------------------------------------------------------===//8#include "../fp_mode.h"9 10#define LOONGARCH_TONEAREST 0x000011#define LOONGARCH_TOWARDZERO 0x010012#define LOONGARCH_UPWARD 0x020013#define LOONGARCH_DOWNWARD 0x030014 15#define LOONGARCH_RMODE_MASK (LOONGARCH_TONEAREST | LOONGARCH_TOWARDZERO | \16 LOONGARCH_UPWARD | LOONGARCH_DOWNWARD)17 18#define LOONGARCH_INEXACT 0x1000019 20CRT_FE_ROUND_MODE __fe_getround(void) {21#if __loongarch_frlen != 022 int fcsr;23# ifdef __clang__24 __asm__ __volatile__("movfcsr2gr %0, $fcsr0" : "=r" (fcsr));25# else26 __asm__ __volatile__("movfcsr2gr %0, $r0" : "=r" (fcsr));27# endif28 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#else41 return CRT_FE_TONEAREST;42#endif43}44 45int __fe_raise_inexact(void) {46#if __loongarch_frlen != 047 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# else53 __asm__ __volatile__("movfcsr2gr %0, $r0" : "=r" (fcsr));54 __asm__ __volatile__(55 "movgr2fcsr $r0, %0" :: "r" (fcsr | LOONGARCH_INEXACT));56# endif57#endif58 return 0;59}60