diff options
Diffstat (limited to 'compiler-rt/lib/builtins/arm/fp_mode.c')
-rw-r--r-- | compiler-rt/lib/builtins/arm/fp_mode.c | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/compiler-rt/lib/builtins/arm/fp_mode.c b/compiler-rt/lib/builtins/arm/fp_mode.c new file mode 100644 index 000000000000..300b71935ad4 --- /dev/null +++ b/compiler-rt/lib/builtins/arm/fp_mode.c @@ -0,0 +1,59 @@ +//===----- 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 0x1000 + +#ifndef __ARM_FP +// For soft float targets, allow changing rounding mode by overriding the weak +// __arm_fe_default_rmode symbol. +FE_ROUND_MODE __attribute__((weak)) __arm_fe_default_rmode = FE_TONEAREST; +#endif + +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 FE_UPWARD; + case ARM_DOWNWARD: + return FE_DOWNWARD; + case ARM_TOWARDZERO: + return FE_TOWARDZERO; + case ARM_TONEAREST: + default: + return 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 +} |