forked from bartvdbraak/blender
7808360c5f
MSVC 2008 ignores alignement attribute when assigning from unaligned float4 vector, returned from other function. Now Cycles uses unaligned loads instead of casts for win32 in x86 mode.
92 lines
2.5 KiB
C
92 lines
2.5 KiB
C
/*
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* Copyright 2011-2013 Blender Foundation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License
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*/
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#ifndef __UTIL_HALF_H__
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#define __UTIL_HALF_H__
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#include "util_types.h"
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CCL_NAMESPACE_BEGIN
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/* Half Floats */
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#ifdef __KERNEL_OPENCL__
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#define float4_store_half(h, f, scale) vstore_half4(f * (scale), 0, h);
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#else
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typedef unsigned short half;
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struct half4 { half x, y, z, w; };
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#ifdef __KERNEL_CUDA__
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ccl_device_inline void float4_store_half(half *h, float4 f, float scale)
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{
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h[0] = __float2half_rn(f.x * scale);
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h[1] = __float2half_rn(f.y * scale);
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h[2] = __float2half_rn(f.z * scale);
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h[3] = __float2half_rn(f.w * scale);
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}
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#else
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ccl_device_inline void float4_store_half(half *h, float4 f, float scale)
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{
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#ifndef __KERNEL_SSE2__
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for(int i = 0; i < 4; i++) {
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/* optimized float to half for pixels:
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* assumes no negative, no nan, no inf, and sets denormal to 0 */
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union { uint i; float f; } in;
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float fscale = f[i] * scale;
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in.f = (fscale > 0.0f)? ((fscale < 65500.0f)? fscale: 65500.0f): 0.0f;
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int x = in.i;
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int absolute = x & 0x7FFFFFFF;
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int Z = absolute + 0xC8000000;
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int result = (absolute < 0x38800000)? 0: Z;
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int rshift = (result >> 13);
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h[i] = (rshift & 0x7FFF);
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}
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#else
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/* same as above with SSE */
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const __m128 mm_scale = _mm_set_ps1(scale);
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const __m128i mm_38800000 = _mm_set1_epi32(0x38800000);
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const __m128i mm_7FFF = _mm_set1_epi32(0x7FFF);
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const __m128i mm_7FFFFFFF = _mm_set1_epi32(0x7FFFFFFF);
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const __m128i mm_C8000000 = _mm_set1_epi32(0xC8000000);
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__m128 mm_fscale = _mm_mul_ps(load_m128(f), mm_scale);
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__m128i x = _mm_castps_si128(_mm_min_ps(_mm_max_ps(mm_fscale, _mm_set_ps1(0.0f)), _mm_set_ps1(65500.0f)));
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__m128i absolute = _mm_and_si128(x, mm_7FFFFFFF);
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__m128i Z = _mm_add_epi32(absolute, mm_C8000000);
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__m128i result = _mm_andnot_si128(_mm_cmplt_epi32(absolute, mm_38800000), Z);
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__m128i rh = _mm_and_si128(_mm_srai_epi32(result, 13), mm_7FFF);
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_mm_storel_pi((__m64*)h, _mm_castsi128_ps(_mm_packs_epi32(rh, rh)));
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#endif
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}
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#endif
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#endif
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CCL_NAMESPACE_END
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#endif /* __UTIL_HALF_H__ */
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