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