forked from OSchip/llvm-project
61 lines
1.7 KiB
C
61 lines
1.7 KiB
C
//===----- lib/aarch64/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 <stdint.h>
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#include "../fp_mode.h"
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#define AARCH64_TONEAREST 0x0
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#define AARCH64_UPWARD 0x1
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#define AARCH64_DOWNWARD 0x2
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#define AARCH64_TOWARDZERO 0x3
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#define AARCH64_RMODE_MASK (AARCH64_TONEAREST | AARCH64_UPWARD | \
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AARCH64_DOWNWARD | AARCH64_TOWARDZERO)
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#define AARCH64_RMODE_SHIFT 22
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#define AARCH64_INEXACT 0x10
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#ifndef __ARM_FP
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// For soft float targets, allow changing rounding mode by overriding the weak
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// __aarch64_fe_default_rmode symbol.
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CRT_FE_ROUND_MODE __attribute__((weak)) __aarch64_fe_default_rmode =
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CRT_FE_TONEAREST;
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#endif
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CRT_FE_ROUND_MODE __fe_getround(void) {
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#ifdef __ARM_FP
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uint64_t fpcr;
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__asm__ __volatile__("mrs %0, fpcr" : "=r" (fpcr));
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fpcr = fpcr >> AARCH64_RMODE_SHIFT & AARCH64_RMODE_MASK;
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switch (fpcr) {
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case AARCH64_UPWARD:
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return CRT_FE_UPWARD;
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case AARCH64_DOWNWARD:
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return CRT_FE_DOWNWARD;
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case AARCH64_TOWARDZERO:
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return CRT_FE_TOWARDZERO;
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case AARCH64_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 __aarch64_fe_default_rmode;
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#endif
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}
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int __fe_raise_inexact(void) {
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#ifdef __ARM_FP
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uint64_t fpsr;
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__asm__ __volatile__("mrs %0, fpsr" : "=r" (fpsr));
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__asm__ __volatile__("msr fpsr, %0" : : "ri" (fpsr | AARCH64_INEXACT));
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return 0;
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#else
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return 0;
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#endif
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}
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