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/*
===========================================================================
Copyright (C) 2011 Thilo Schulz <thilo@tjps.eu>
This file is part of Quake III Arena source code.
Quake III Arena source code is free software; you can redistribute it
and/or modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of the License,
or (at your option) any later version.
Quake III Arena source code is distributed in the hope that it will be
useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with Quake III Arena source code; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
===========================================================================
*/
#include "qasm-inline.h"
#include "../qcommon/q_shared.h"
/*
* GNU inline asm version of qsnapvector
* See MASM snapvector.asm for commentary
*/
static unsigned char ssemask[16] __attribute__((aligned(16))) =
{
"\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\x00\x00\x00\x00"
};
static const unsigned int ssecw __attribute__((aligned(16))) = 0x00001F80;
static const unsigned short fpucw = 0x037F;
void qsnapvectorsse(vec3_t vec)
{
uint32_t oldcw __attribute__((aligned(16)));
__asm__ volatile
(
"stmxcsr %3\n"
"ldmxcsr %1\n"
"movaps (%0), %%xmm1\n"
"movups (%2), %%xmm0\n"
"cvtps2dq %%xmm0, %%xmm0\n"
"cvtdq2ps %%xmm0, %%xmm0\n"
// vec MUST reside in register rdi as maskmovdqu uses
// it as an implicit operand. The "D" constraint makes
// sure of that.
"maskmovdqu %%xmm1, %%xmm0\n"
"ldmxcsr %3\n"
:
: "r" (ssemask), "m" (ssecw), "D" (vec), "m" (oldcw)
: "memory", "%xmm0", "%xmm1"
);
}
#define QROUNDX87(src) \
"flds " src "\n" \
"fistp " src "\n" \
"fild " src "\n" \
"fstp " src "\n"
void qsnapvectorx87(vec3_t vec)
{
__asm__ volatile
(
"sub $2, " ESP "\n"
"fnstcw (" ESP ")\n"
"fldcw %0\n"
QROUNDX87("(%1)")
QROUNDX87("4(%1)")
QROUNDX87("8(%1)")
"fldcw (" ESP ")\n"
"add $2, " ESP "\n"
:
: "m" (fpucw), "r" (vec)
: "memory"
);
}
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