2 * Copyright (c) 2004-2005 David Schultz <das@FreeBSD.ORG>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 #include <sys/cdefs.h>
30 #include <sys/types.h>
31 #include <machine/npx.h>
34 const fenv_t __fe_dfl_env = {
40 { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
41 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff }
44 enum __sse_support __has_sse =
51 #define getfl(x) __asm __volatile("pushfl\n\tpopl %0" : "=mr" (*(x)))
52 #define setfl(x) __asm __volatile("pushl %0\n\tpopfl" : : "g" (x))
53 #define cpuid_dx(x) __asm __volatile("pushl %%ebx\n\tmovl $1, %%eax\n\t" \
54 "cpuid\n\tpopl %%ebx" \
55 : "=d" (*(x)) : : "eax", "ecx")
58 * Test for SSE support on this processor. We need to do this because
59 * we need to use ldmxcsr/stmxcsr to get correct results if any part
60 * of the program was compiled to use SSE floating-point, but we can't
61 * use SSE on older processors.
71 nflag = flag ^ 0x200000;
75 /* Not a 486, so CPUID should work. */
76 cpuid_dx(&dx_features);
77 if (dx_features & 0x2000000) {
78 __has_sse = __SSE_YES;
87 fesetexceptflag(const fexcept_t *flagp, int excepts)
93 env.__status &= ~excepts;
94 env.__status |= *flagp & excepts;
100 mxcsr |= *flagp & excepts;
108 feraiseexcept(int excepts)
110 fexcept_t ex = excepts;
112 fesetexceptflag(&ex, excepts);
118 fegetenv(fenv_t *envp)
124 * fnstenv masks all exceptions, so we need to restore
125 * the old control word to avoid this side effect.
127 __fldcw(envp->__control);
130 __set_mxcsr(*envp, mxcsr);
136 feholdexcept(fenv_t *envp)
144 __set_mxcsr(*envp, mxcsr);
145 mxcsr &= ~FE_ALL_EXCEPT;
146 mxcsr |= FE_ALL_EXCEPT << _SSE_EMASK_SHIFT;
153 feupdateenv(const fenv_t *envp)
164 feraiseexcept((mxcsr | status) & FE_ALL_EXCEPT);
169 __feenableexcept(int mask)
171 __uint32_t mxcsr, omask;
174 mask &= FE_ALL_EXCEPT;
180 omask = ~(control | mxcsr >> _SSE_EMASK_SHIFT) & FE_ALL_EXCEPT;
184 mxcsr &= ~(mask << _SSE_EMASK_SHIFT);
191 __fedisableexcept(int mask)
193 __uint32_t mxcsr, omask;
196 mask &= FE_ALL_EXCEPT;
202 omask = ~(control | mxcsr >> _SSE_EMASK_SHIFT) & FE_ALL_EXCEPT;
206 mxcsr |= mask << _SSE_EMASK_SHIFT;
212 __weak_reference(__feenableexcept, feenableexcept);
213 __weak_reference(__fedisableexcept, fedisableexcept);