blob: 064f4e94fb849d749437b3f2cbc2b86b0dd66ab6 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
|
//===----- 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(void) {
#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(void) {
#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
}
|
