ed0bf875a9
After a follow-up change (D98332) this header can be included the same time as fenv.h when running the tests. To avoid enum members conflicting with the macros/enums defined in the host fenv.h, prefix them with CRT_. Reviewed By: peter.smith Differential Revision: https://reviews.llvm.org/D98333
61 lines
1.6 KiB
C
61 lines
1.6 KiB
C
//===----- lib/arm/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 ARM_TONEAREST 0x0
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#define ARM_UPWARD 0x1
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#define ARM_DOWNWARD 0x2
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#define ARM_TOWARDZERO 0x3
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#define ARM_RMODE_MASK (ARM_TONEAREST | ARM_UPWARD | \
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ARM_DOWNWARD | ARM_TOWARDZERO)
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#define ARM_RMODE_SHIFT 22
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#define ARM_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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// __arm_fe_default_rmode symbol.
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CRT_FE_ROUND_MODE __attribute__((weak)) __arm_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() {
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#ifdef __ARM_FP
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uint32_t fpscr;
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__asm__ __volatile__("vmrs %0, fpscr" : "=r" (fpscr));
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fpscr = fpscr >> ARM_RMODE_SHIFT & ARM_RMODE_MASK;
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switch (fpscr) {
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case ARM_UPWARD:
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return CRT_FE_UPWARD;
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case ARM_DOWNWARD:
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return CRT_FE_DOWNWARD;
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case ARM_TOWARDZERO:
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return CRT_FE_TOWARDZERO;
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case ARM_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 __arm_fe_default_rmode;
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#endif
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}
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int __fe_raise_inexact() {
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#ifdef __ARM_FP
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uint32_t fpscr;
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__asm__ __volatile__("vmrs %0, fpscr" : "=r" (fpscr));
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__asm__ __volatile__("vmsr fpscr, %0" : : "ri" (fpscr | ARM_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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