7047431d2f
The FE_* rounding mode constants have different values on different architectures, so you can't just copy & paste the validity check from one to another, like I did here... Bug: http://b/254501880 Test: treehugger Change-Id: I2ffa766ffcbe22c1afcd28eab4bd964100dc2d98
148 lines
4 KiB
C
148 lines
4 KiB
C
/*-
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* Copyright (c) 2004 David Schultz <das@FreeBSD.ORG>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD: libm/aarch64/fenv.c $
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*/
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#include <stdint.h>
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#include <fenv.h>
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#define FPCR_RMODE_SHIFT 22
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const fenv_t __fe_dfl_env = { 0 /* control */, 0 /* status */};
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typedef __uint32_t fpu_control_t; // FPCR, Floating-point Control Register.
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typedef __uint32_t fpu_status_t; // FPSR, Floating-point Status Register.
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#define __get(REGISTER, __value) { \
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uint64_t __value64; \
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__asm__ __volatile__("mrs %0," REGISTER : "=r" (__value64)); \
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__value = (__uint32_t) __value64; \
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}
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#define __get_fpcr(__fpcr) __get("fpcr", __fpcr)
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#define __get_fpsr(__fpsr) __get("fpsr", __fpsr)
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#define __set(REGISTER, __value) { \
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uint64_t __value64 = __value; \
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__asm__ __volatile__("msr " REGISTER ",%0" : : "ri" (__value64)); \
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}
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#define __set_fpcr(__fpcr) __set("fpcr", __fpcr)
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#define __set_fpsr(__fpsr) __set("fpsr", __fpsr)
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int fegetenv(fenv_t* envp) {
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__get_fpcr(envp->__control);
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__get_fpsr(envp->__status);
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return 0;
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}
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int fesetenv(const fenv_t* envp) {
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fpu_control_t fpcr;
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__get_fpcr(fpcr);
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if (envp->__control != fpcr) {
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__set_fpcr(envp->__control);
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}
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__set_fpsr(envp->__status);
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return 0;
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}
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int feclearexcept(int excepts) {
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fpu_status_t fpsr;
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__get_fpsr(fpsr);
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fpsr &= ~(excepts & FE_ALL_EXCEPT);
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__set_fpsr(fpsr);
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return 0;
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}
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int fegetexceptflag(fexcept_t* flagp, int excepts) {
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fpu_status_t fpsr;
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__get_fpsr(fpsr);
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*flagp = fpsr & (excepts & FE_ALL_EXCEPT);
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return 0;
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}
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int fesetexceptflag(const fexcept_t* flagp, int excepts) {
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excepts &= FE_ALL_EXCEPT;
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fpu_status_t fpsr;
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__get_fpsr(fpsr);
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fpsr &= ~excepts;
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fpsr |= *flagp & excepts;
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__set_fpsr(fpsr);
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return 0;
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}
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int feraiseexcept(int excepts) {
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fexcept_t ex = excepts;
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fesetexceptflag(&ex, excepts);
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return 0;
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}
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int fetestexcept(int excepts) {
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fpu_status_t fpsr;
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__get_fpsr(fpsr);
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return (fpsr & (excepts & FE_ALL_EXCEPT));
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}
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int fegetround(void) {
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fpu_control_t fpcr;
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__get_fpcr(fpcr);
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return ((fpcr >> FPCR_RMODE_SHIFT) & FE_TOWARDZERO);
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}
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int fesetround(int round) {
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if (round < FE_TONEAREST || round > FE_TOWARDZERO) return -1;
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fpu_control_t fpcr;
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__get_fpcr(fpcr);
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fpu_control_t new_fpcr = fpcr & ~(FE_TOWARDZERO << FPCR_RMODE_SHIFT);
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new_fpcr |= (round << FPCR_RMODE_SHIFT);
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if (new_fpcr != fpcr) {
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__set_fpcr(new_fpcr);
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}
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return 0;
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}
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int feholdexcept(fenv_t* envp) {
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fegetenv(envp);
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feclearexcept(FE_ALL_EXCEPT);
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return 0;
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}
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int feupdateenv(const fenv_t* envp) {
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int excepts = fetestexcept(FE_ALL_EXCEPT);
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fesetenv(envp);
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feraiseexcept(excepts);
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return 0;
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}
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int feenableexcept(int mask __unused) {
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return -1;
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}
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int fedisableexcept(int mask __unused) {
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return 0;
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}
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int fegetexcept(void) {
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return 0;
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}
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