derek.holloway
7502bf64a4
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60 lines
1.7 KiB
C
60 lines
1.7 KiB
C
//=== lib/builtins/loongarch/fp_mode.c - Floaing-point mode utilities -*- C -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "../fp_mode.h"
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#define LOONGARCH_TONEAREST 0x0000
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#define LOONGARCH_TOWARDZERO 0x0100
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#define LOONGARCH_UPWARD 0x0200
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#define LOONGARCH_DOWNWARD 0x0300
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#define LOONGARCH_RMODE_MASK (LOONGARCH_TONEAREST | LOONGARCH_TOWARDZERO | \
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LOONGARCH_UPWARD | LOONGARCH_DOWNWARD)
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#define LOONGARCH_INEXACT 0x10000
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CRT_FE_ROUND_MODE __fe_getround(void) {
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#if __loongarch_frlen != 0
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int fcsr;
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# ifdef __clang__
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__asm__ __volatile__("movfcsr2gr %0, $fcsr0" : "=r" (fcsr));
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# else
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__asm__ __volatile__("movfcsr2gr %0, $r0" : "=r" (fcsr));
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# endif
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fcsr &= LOONGARCH_RMODE_MASK;
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switch (fcsr) {
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case LOONGARCH_TOWARDZERO:
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return CRT_FE_TOWARDZERO;
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case LOONGARCH_DOWNWARD:
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return CRT_FE_DOWNWARD;
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case LOONGARCH_UPWARD:
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return CRT_FE_UPWARD;
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case LOONGARCH_TONEAREST:
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default:
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return CRT_FE_TONEAREST;
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}
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#else
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return CRT_FE_TONEAREST;
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#endif
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}
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int __fe_raise_inexact(void) {
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#if __loongarch_frlen != 0
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int fcsr;
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# ifdef __clang__
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__asm__ __volatile__("movfcsr2gr %0, $fcsr0" : "=r" (fcsr));
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__asm__ __volatile__(
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"movgr2fcsr $fcsr0, %0" :: "r" (fcsr | LOONGARCH_INEXACT));
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# else
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__asm__ __volatile__("movfcsr2gr %0, $r0" : "=r" (fcsr));
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__asm__ __volatile__(
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"movgr2fcsr $r0, %0" :: "r" (fcsr | LOONGARCH_INEXACT));
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# endif
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#endif
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return 0;
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}
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