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//=== 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;
# ifdef __clang__
__asm__ __volatile__("movfcsr2gr %0, $fcsr0" : "=r" (fcsr));
# else
__asm__ __volatile__("movfcsr2gr %0, $r0" : "=r" (fcsr));
# endif
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;
# ifdef __clang__
__asm__ __volatile__("movfcsr2gr %0, $fcsr0" : "=r" (fcsr));
__asm__ __volatile__(
"movgr2fcsr $fcsr0, %0" :: "r" (fcsr | LOONGARCH_INEXACT));
# else
__asm__ __volatile__("movfcsr2gr %0, $r0" : "=r" (fcsr));
__asm__ __volatile__(
"movgr2fcsr $r0, %0" :: "r" (fcsr | LOONGARCH_INEXACT));
# endif
#endif
return 0;
}
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