diff options
Diffstat (limited to 'libm/i387/fenv.c')
| -rw-r--r-- | libm/i387/fenv.c | 211 |
1 files changed, 0 insertions, 211 deletions
diff --git a/libm/i387/fenv.c b/libm/i387/fenv.c deleted file mode 100644 index 2794faf..0000000 --- a/libm/i387/fenv.c +++ /dev/null @@ -1,211 +0,0 @@ -/*- - * Copyright (c) 2004-2005 David Schultz <das@FreeBSD.ORG> - * All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * - * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND - * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE - * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE - * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE - * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL - * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS - * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) - * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT - * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY - * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF - * SUCH DAMAGE. - * - * $FreeBSD: src/lib/msun/i387/fenv.c,v 1.2 2005/03/17 22:21:46 das Exp $ - */ - -#include <sys/cdefs.h> -#include <sys/types.h> -#include "npx.h" -#include "fenv.h" - -const fenv_t __fe_dfl_env = { - __INITIAL_NPXCW__, - 0x0000, - 0x0000, - 0x1f80, - 0xffffffff, - { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, - 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff } -}; - -enum __sse_support __has_sse = -#ifdef __SSE__ - __SSE_YES; -#else - __SSE_UNK; -#endif - -#define getfl(x) __asm __volatile("pushfl\n\tpopl %0" : "=mr" (*(x))) -#define setfl(x) __asm __volatile("pushl %0\n\tpopfl" : : "g" (x)) -#define cpuid_dx(x) __asm __volatile("pushl %%ebx\n\tmovl $1, %%eax\n\t" \ - "cpuid\n\tpopl %%ebx" \ - : "=d" (*(x)) : : "eax", "ecx") - -/* - * Test for SSE support on this processor. We need to do this because - * we need to use ldmxcsr/stmxcsr to get correct results if any part - * of the program was compiled to use SSE floating-point, but we can't - * use SSE on older processors. - */ -int -__test_sse(void) -{ - int flag, nflag; - int dx_features; - - /* Am I a 486? */ - getfl(&flag); - nflag = flag ^ 0x200000; - setfl(nflag); - getfl(&nflag); - if (flag != nflag) { - /* Not a 486, so CPUID should work. */ - cpuid_dx(&dx_features); - if (dx_features & 0x2000000) { - __has_sse = __SSE_YES; - return (1); - } - } - __has_sse = __SSE_NO; - return (0); -} - -int -fesetexceptflag(const fexcept_t *flagp, int excepts) -{ - fenv_t env; - int mxcsr; - - __fnstenv(&env); - env.__status &= ~excepts; - env.__status |= *flagp & excepts; - __fldenv(env); - - if (__HAS_SSE()) { - __stmxcsr(&mxcsr); - mxcsr &= ~excepts; - mxcsr |= *flagp & excepts; - __ldmxcsr(mxcsr); - } - - return (0); -} - -int -feraiseexcept(int excepts) -{ - fexcept_t ex = excepts; - - fesetexceptflag(&ex, excepts); - __fwait(); - return (0); -} - -int -fegetenv(fenv_t *envp) -{ - int control, mxcsr; - - /* - * fnstenv masks all exceptions, so we need to save and - * restore the control word to avoid this side effect. - */ - __fnstcw(&control); - __fnstenv(envp); - if (__HAS_SSE()) { - __stmxcsr(&mxcsr); - __set_mxcsr(*envp, mxcsr); - } - __fldcw(control); - return (0); -} - -int -feholdexcept(fenv_t *envp) -{ - int mxcsr; - - __fnstenv(envp); - __fnclex(); - if (__HAS_SSE()) { - __stmxcsr(&mxcsr); - __set_mxcsr(*envp, mxcsr); - mxcsr &= ~FE_ALL_EXCEPT; - mxcsr |= FE_ALL_EXCEPT << _SSE_EMASK_SHIFT; - __ldmxcsr(mxcsr); - } - return (0); -} - -int -feupdateenv(const fenv_t *envp) -{ - int mxcsr, status; - - __fnstsw(&status); - if (__HAS_SSE()) - __stmxcsr(&mxcsr); - else - mxcsr = 0; - fesetenv(envp); - feraiseexcept((mxcsr | status) & FE_ALL_EXCEPT); - return (0); -} - -int -__feenableexcept(int mask) -{ - int mxcsr, control, omask; - - mask &= FE_ALL_EXCEPT; - __fnstcw(&control); - if (__HAS_SSE()) - __stmxcsr(&mxcsr); - else - mxcsr = 0; - omask = (control | mxcsr >> _SSE_EMASK_SHIFT) & FE_ALL_EXCEPT; - control &= ~mask; - __fldcw(control); - if (__HAS_SSE()) { - mxcsr &= ~(mask << _SSE_EMASK_SHIFT); - __ldmxcsr(mxcsr); - } - return (~omask); -} - -int -__fedisableexcept(int mask) -{ - int mxcsr, control, omask; - - mask &= FE_ALL_EXCEPT; - __fnstcw(&control); - if (__HAS_SSE()) - __stmxcsr(&mxcsr); - else - mxcsr = 0; - omask = (control | mxcsr >> _SSE_EMASK_SHIFT) & FE_ALL_EXCEPT; - control |= mask; - __fldcw(control); - if (__HAS_SSE()) { - mxcsr |= mask << _SSE_EMASK_SHIFT; - __ldmxcsr(mxcsr); - } - return (~omask); -} - -__weak_reference(__feenableexcept, feenableexcept); -__weak_reference(__fedisableexcept, fedisableexcept); |