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| 5564 | serge | 1 | /************************************************************************** |
| 2 | * |
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| 3 | * Copyright 2008 VMware, Inc. |
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| 4 | * All Rights Reserved. |
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| 5 | * |
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| 6 | * Permission is hereby granted, free of charge, to any person obtaining a |
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| 7 | * copy of this software and associated documentation files (the |
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| 8 | * "Software"), to deal in the Software without restriction, including |
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| 9 | * without limitation the rights to use, copy, modify, merge, publish, |
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| 10 | * distribute, sub license, and/or sell copies of the Software, and to |
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| 11 | * permit persons to whom the Software is furnished to do so, subject to |
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| 12 | * the following conditions: |
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| 13 | * |
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| 14 | * The above copyright notice and this permission notice (including the |
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| 15 | * next paragraph) shall be included in all copies or substantial portions |
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| 16 | * of the Software. |
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| 17 | * |
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| 18 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS |
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| 19 | * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
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| 20 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. |
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| 21 | * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR |
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| 22 | * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, |
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| 23 | * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE |
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| 24 | * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
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| 25 | * |
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| 26 | **************************************************************************/ |
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| 27 | |||
| 28 | |||
| 29 | |||
| 30 | #include "pipe/p_config.h" |
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| 31 | #include "util/u_math.h" |
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| 32 | #include "util/u_cpu_detect.h" |
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| 33 | |||
| 34 | #if defined(PIPE_ARCH_SSE) |
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| 35 | #include |
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| 36 | /* This is defined in pmmintrin.h, but it can only be included when -msse3 is |
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| 37 | * used, so just define it here to avoid further. */ |
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| 38 | #define _MM_DENORMALS_ZERO_MASK 0x0040 |
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| 39 | #endif |
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| 40 | |||
| 41 | |||
| 42 | /** 2^x, for x in [-1.0, 1.0) */ |
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| 43 | float pow2_table[POW2_TABLE_SIZE]; |
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| 44 | |||
| 45 | |||
| 46 | static void |
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| 47 | init_pow2_table(void) |
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| 48 | { |
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| 49 | int i; |
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| 50 | for (i = 0; i < POW2_TABLE_SIZE; i++) |
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| 51 | pow2_table[i] = (float) pow(2.0, (i - POW2_TABLE_OFFSET) / POW2_TABLE_SCALE); |
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| 52 | } |
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| 53 | |||
| 54 | |||
| 55 | /** log2(x), for x in [1.0, 2.0) */ |
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| 56 | float log2_table[LOG2_TABLE_SIZE]; |
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| 57 | |||
| 58 | |||
| 59 | static void |
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| 60 | init_log2_table(void) |
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| 61 | { |
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| 62 | unsigned i; |
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| 63 | for (i = 0; i < LOG2_TABLE_SIZE; i++) |
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| 64 | log2_table[i] = (float) log2(1.0 + i * (1.0 / LOG2_TABLE_SCALE)); |
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| 65 | } |
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| 66 | |||
| 67 | |||
| 68 | /** |
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| 69 | * One time init for math utilities. |
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| 70 | */ |
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| 71 | void |
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| 72 | util_init_math(void) |
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| 73 | { |
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| 74 | static boolean initialized = FALSE; |
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| 75 | if (!initialized) { |
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| 76 | init_pow2_table(); |
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| 77 | init_log2_table(); |
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| 78 | initialized = TRUE; |
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| 79 | } |
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| 80 | } |
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| 81 | |||
| 82 | /** |
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| 83 | * Fetches the contents of the fpstate (mxcsr on x86) register. |
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| 84 | * |
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| 85 | * On platforms without support for it just returns 0. |
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| 86 | */ |
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| 87 | unsigned |
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| 88 | util_fpstate_get(void) |
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| 89 | { |
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| 90 | unsigned mxcsr = 0; |
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| 91 | |||
| 92 | #if defined(PIPE_ARCH_SSE) |
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| 93 | if (util_cpu_caps.has_sse) { |
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| 94 | mxcsr = _mm_getcsr(); |
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| 95 | } |
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| 96 | #endif |
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| 97 | |||
| 98 | return mxcsr; |
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| 99 | } |
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| 100 | |||
| 101 | /** |
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| 102 | * Make sure that the fp treats the denormalized floating |
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| 103 | * point numbers as zero. |
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| 104 | * |
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| 105 | * This is the behavior required by D3D10. OpenGL doesn't care. |
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| 106 | */ |
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| 107 | unsigned |
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| 108 | util_fpstate_set_denorms_to_zero(unsigned current_mxcsr) |
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| 109 | { |
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| 110 | #if defined(PIPE_ARCH_SSE) |
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| 111 | if (util_cpu_caps.has_sse) { |
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| 112 | /* Enable flush to zero mode */ |
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| 113 | current_mxcsr |= _MM_FLUSH_ZERO_MASK; |
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| 114 | if (util_cpu_caps.has_daz) { |
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| 115 | /* Enable denormals are zero mode */ |
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| 116 | current_mxcsr |= _MM_DENORMALS_ZERO_MASK; |
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| 117 | } |
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| 118 | util_fpstate_set(current_mxcsr); |
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| 119 | } |
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| 120 | #endif |
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| 121 | return current_mxcsr; |
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| 122 | } |
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| 123 | |||
| 124 | /** |
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| 125 | * Set the state of the fpstate (mxcsr on x86) register. |
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| 126 | * |
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| 127 | * On platforms without support for it's a noop. |
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| 128 | */ |
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| 129 | void |
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| 130 | util_fpstate_set(unsigned mxcsr) |
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| 131 | { |
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| 132 | #if defined(PIPE_ARCH_SSE) |
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| 133 | if (util_cpu_caps.has_sse) { |
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| 134 | _mm_setcsr(mxcsr); |
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| 135 | } |
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| 136 | #endif |
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| 137 | } |