1 /**************************************************************************
3 * Copyright 2008 VMware, Inc.
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the
8 * "Software"), to deal in the Software without restriction, including
9 * without limitation the rights to use, copy, modify, merge, publish,
10 * distribute, sub license, and/or sell copies of the Software, and to
11 * permit persons to whom the Software is furnished to do so, subject to
12 * the following conditions:
14 * The above copyright notice and this permission notice (including the
15 * next paragraph) shall be included in all copies or substantial portions
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
19 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
20 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
21 * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
22 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
23 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
24 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
26 **************************************************************************/
30 #include "pipe/p_config.h"
31 #include "util/u_math.h"
32 #include "util/u_cpu_detect.h"
34 #if defined(PIPE_ARCH_SSE)
35 #include <xmmintrin.h>
36 /* This is defined in pmmintrin.h, but it can only be included when -msse3 is
37 * used, so just define it here to avoid further. */
38 #ifndef _MM_DENORMALS_ZERO_MASK
39 #define _MM_DENORMALS_ZERO_MASK 0x0040
44 /** 2^x, for x in [-1.0, 1.0) */
45 float pow2_table
[POW2_TABLE_SIZE
];
52 for (i
= 0; i
< POW2_TABLE_SIZE
; i
++)
53 pow2_table
[i
] = exp2f((i
- POW2_TABLE_OFFSET
) / POW2_TABLE_SCALE
);
57 /** log2(x), for x in [1.0, 2.0) */
58 float log2_table
[LOG2_TABLE_SIZE
];
65 for (i
= 0; i
< LOG2_TABLE_SIZE
; i
++)
66 log2_table
[i
] = (float) log2(1.0 + i
* (1.0 / LOG2_TABLE_SCALE
));
71 * One time init for math utilities.
76 static boolean initialized
= FALSE
;
85 * Fetches the contents of the fpstate (mxcsr on x86) register.
87 * On platforms without support for it just returns 0.
90 util_fpstate_get(void)
94 #if defined(PIPE_ARCH_SSE)
95 if (util_cpu_caps
.has_sse
) {
104 * Make sure that the fp treats the denormalized floating
105 * point numbers as zero.
107 * This is the behavior required by D3D10. OpenGL doesn't care.
110 util_fpstate_set_denorms_to_zero(unsigned current_mxcsr
)
112 #if defined(PIPE_ARCH_SSE)
113 if (util_cpu_caps
.has_sse
) {
114 /* Enable flush to zero mode */
115 current_mxcsr
|= _MM_FLUSH_ZERO_MASK
;
116 if (util_cpu_caps
.has_daz
) {
117 /* Enable denormals are zero mode */
118 current_mxcsr
|= _MM_DENORMALS_ZERO_MASK
;
120 util_fpstate_set(current_mxcsr
);
123 return current_mxcsr
;
127 * Set the state of the fpstate (mxcsr on x86) register.
129 * On platforms without support for it's a noop.
132 util_fpstate_set(unsigned mxcsr
)
134 #if defined(PIPE_ARCH_SSE)
135 if (util_cpu_caps
.has_sse
) {