50 lines
1.4 KiB
C
50 lines
1.4 KiB
C
//=== lib/builtins/loongarch/fp_mode.c - Floaing-point mode utilities -*- C -*-===//
|
|
//
|
|
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
|
|
// See https://llvm.org/LICENSE.txt for license information.
|
|
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
#include "../fp_mode.h"
|
|
|
|
#define LOONGARCH_TONEAREST 0x0000
|
|
#define LOONGARCH_TOWARDZERO 0x0100
|
|
#define LOONGARCH_UPWARD 0x0200
|
|
#define LOONGARCH_DOWNWARD 0x0300
|
|
|
|
#define LOONGARCH_RMODE_MASK (LOONGARCH_TONEAREST | LOONGARCH_TOWARDZERO | \
|
|
LOONGARCH_UPWARD | LOONGARCH_DOWNWARD)
|
|
|
|
#define LOONGARCH_INEXACT 0x10000
|
|
|
|
CRT_FE_ROUND_MODE __fe_getround(void) {
|
|
#if __loongarch_frlen != 0
|
|
int fcsr;
|
|
__asm__ __volatile__("movfcsr2gr %0, $fcsr0" : "=r" (fcsr));
|
|
fcsr &= LOONGARCH_RMODE_MASK;
|
|
switch (fcsr) {
|
|
case LOONGARCH_TOWARDZERO:
|
|
return CRT_FE_TOWARDZERO;
|
|
case LOONGARCH_DOWNWARD:
|
|
return CRT_FE_DOWNWARD;
|
|
case LOONGARCH_UPWARD:
|
|
return CRT_FE_UPWARD;
|
|
case LOONGARCH_TONEAREST:
|
|
default:
|
|
return CRT_FE_TONEAREST;
|
|
}
|
|
#else
|
|
return CRT_FE_TONEAREST;
|
|
#endif
|
|
}
|
|
|
|
int __fe_raise_inexact(void) {
|
|
#if __loongarch_frlen != 0
|
|
int fcsr;
|
|
__asm__ __volatile__("movfcsr2gr %0, $fcsr0" : "=r" (fcsr));
|
|
__asm__ __volatile__(
|
|
"movgr2fcsr $fcsr0, %0" :: "r" (fcsr | LOONGARCH_INEXACT));
|
|
#endif
|
|
return 0;
|
|
}
|