0,0 → 1,137 |
/************************************************************************** |
* |
* Copyright 2008 VMware, Inc. |
* All Rights Reserved. |
* |
* Permission is hereby granted, free of charge, to any person obtaining a |
* copy of this software and associated documentation files (the |
* "Software"), to deal in the Software without restriction, including |
* without limitation the rights to use, copy, modify, merge, publish, |
* distribute, sub license, and/or sell copies of the Software, and to |
* permit persons to whom the Software is furnished to do so, subject to |
* the following conditions: |
* |
* The above copyright notice and this permission notice (including the |
* next paragraph) shall be included in all copies or substantial portions |
* of the Software. |
* |
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS |
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. |
* IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR |
* ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, |
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE |
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
* |
**************************************************************************/ |
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#include "pipe/p_config.h" |
#include "util/u_math.h" |
#include "util/u_cpu_detect.h" |
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#if defined(PIPE_ARCH_SSE) |
#include <xmmintrin.h> |
/* This is defined in pmmintrin.h, but it can only be included when -msse3 is |
* used, so just define it here to avoid further. */ |
#define _MM_DENORMALS_ZERO_MASK 0x0040 |
#endif |
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/** 2^x, for x in [-1.0, 1.0) */ |
float pow2_table[POW2_TABLE_SIZE]; |
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static void |
init_pow2_table(void) |
{ |
int i; |
for (i = 0; i < POW2_TABLE_SIZE; i++) |
pow2_table[i] = (float) pow(2.0, (i - POW2_TABLE_OFFSET) / POW2_TABLE_SCALE); |
} |
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/** log2(x), for x in [1.0, 2.0) */ |
float log2_table[LOG2_TABLE_SIZE]; |
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static void |
init_log2_table(void) |
{ |
unsigned i; |
for (i = 0; i < LOG2_TABLE_SIZE; i++) |
log2_table[i] = (float) log2(1.0 + i * (1.0 / LOG2_TABLE_SCALE)); |
} |
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/** |
* One time init for math utilities. |
*/ |
void |
util_init_math(void) |
{ |
static boolean initialized = FALSE; |
if (!initialized) { |
init_pow2_table(); |
init_log2_table(); |
initialized = TRUE; |
} |
} |
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/** |
* Fetches the contents of the fpstate (mxcsr on x86) register. |
* |
* On platforms without support for it just returns 0. |
*/ |
unsigned |
util_fpstate_get(void) |
{ |
unsigned mxcsr = 0; |
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#if defined(PIPE_ARCH_SSE) |
if (util_cpu_caps.has_sse) { |
mxcsr = _mm_getcsr(); |
} |
#endif |
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return mxcsr; |
} |
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/** |
* Make sure that the fp treats the denormalized floating |
* point numbers as zero. |
* |
* This is the behavior required by D3D10. OpenGL doesn't care. |
*/ |
unsigned |
util_fpstate_set_denorms_to_zero(unsigned current_mxcsr) |
{ |
#if defined(PIPE_ARCH_SSE) |
if (util_cpu_caps.has_sse) { |
/* Enable flush to zero mode */ |
current_mxcsr |= _MM_FLUSH_ZERO_MASK; |
if (util_cpu_caps.has_daz) { |
/* Enable denormals are zero mode */ |
current_mxcsr |= _MM_DENORMALS_ZERO_MASK; |
} |
util_fpstate_set(current_mxcsr); |
} |
#endif |
return current_mxcsr; |
} |
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/** |
* Set the state of the fpstate (mxcsr on x86) register. |
* |
* On platforms without support for it's a noop. |
*/ |
void |
util_fpstate_set(unsigned mxcsr) |
{ |
#if defined(PIPE_ARCH_SSE) |
if (util_cpu_caps.has_sse) { |
_mm_setcsr(mxcsr); |
} |
#endif |
} |