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[compiler-rt][builtins] Support builtins for LoongArch
Initial builtins for LoongArch. Add loongarch64 to ALL_CRT_SUPPORTED_ARCH list. Support fe_getround and fe_raise_inexact in builtins. Differential Revision: https://reviews.llvm.org/D136338
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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" | ||
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#define LOONGARCH_TONEAREST 0x0000 | ||
#define LOONGARCH_TOWARDZERO 0x0100 | ||
#define LOONGARCH_UPWARD 0x0200 | ||
#define LOONGARCH_DOWNWARD 0x0300 | ||
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#define LOONGARCH_RMODE_MASK (LOONGARCH_TONEAREST | LOONGARCH_TOWARDZERO | \ | ||
LOONGARCH_UPWARD | LOONGARCH_DOWNWARD) | ||
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#define LOONGARCH_INEXACT 0x10000 | ||
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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 | ||
} | ||
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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; | ||
} |
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