| //===----- lib/arm/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 <stdint.h> |
| |
| #include "../fp_mode.h" |
| |
| #define ARM_TONEAREST 0x0 |
| #define ARM_UPWARD 0x1 |
| #define ARM_DOWNWARD 0x2 |
| #define ARM_TOWARDZERO 0x3 |
| #define ARM_RMODE_MASK (ARM_TONEAREST | ARM_UPWARD | \ |
| ARM_DOWNWARD | ARM_TOWARDZERO) |
| #define ARM_RMODE_SHIFT 22 |
| |
| #define ARM_INEXACT 0x10 |
| |
| #ifndef __ARM_FP |
| // For soft float targets, allow changing rounding mode by overriding the weak |
| // __arm_fe_default_rmode symbol. |
| CRT_FE_ROUND_MODE __attribute__((weak)) __arm_fe_default_rmode = |
| CRT_FE_TONEAREST; |
| #endif |
| |
| CRT_FE_ROUND_MODE __fe_getround() { |
| #ifdef __ARM_FP |
| uint32_t fpscr; |
| __asm__ __volatile__("vmrs %0, fpscr" : "=r" (fpscr)); |
| fpscr = fpscr >> ARM_RMODE_SHIFT & ARM_RMODE_MASK; |
| switch (fpscr) { |
| case ARM_UPWARD: |
| return CRT_FE_UPWARD; |
| case ARM_DOWNWARD: |
| return CRT_FE_DOWNWARD; |
| case ARM_TOWARDZERO: |
| return CRT_FE_TOWARDZERO; |
| case ARM_TONEAREST: |
| default: |
| return CRT_FE_TONEAREST; |
| } |
| #else |
| return __arm_fe_default_rmode; |
| #endif |
| } |
| |
| int __fe_raise_inexact() { |
| #ifdef __ARM_FP |
| uint32_t fpscr; |
| __asm__ __volatile__("vmrs %0, fpscr" : "=r" (fpscr)); |
| __asm__ __volatile__("vmsr fpscr, %0" : : "ri" (fpscr | ARM_INEXACT)); |
| return 0; |
| #else |
| return 0; |
| #endif |
| } |