1c864a9d15
We use a standard set of strict compiler warnings with Clang and GCC to continuously test and maintain C89 conformance in the libjpeg API code. However, SIMD extensions need not comply with that. The AltiVec code specifically uses some C99isms, so disable -Wc99-extensions and -Wpedantic in the scope of that code. Also disable -Wshadow, because I'm too lazy to fix the TRANSPOSE() macro. Also use #ifdef __BIG_ENDIAN__ and #if defined(__BIG_ENDIAN__) instead of #if __BIG_ENDIAN__
108 lines
4.4 KiB
C
108 lines
4.4 KiB
C
/*
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* AltiVec optimizations for libjpeg-turbo
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*
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* Copyright (C) 2014-2015, D. R. Commander. All Rights Reserved.
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*
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* This software is provided 'as-is', without any express or implied
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* warranty. In no event will the authors be held liable for any damages
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* arising from the use of this software.
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*
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* Permission is granted to anyone to use this software for any purpose,
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* including commercial applications, and to alter it and redistribute it
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* freely, subject to the following restrictions:
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*
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* 1. The origin of this software must not be misrepresented; you must not
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* claim that you wrote the original software. If you use this software
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* in a product, an acknowledgment in the product documentation would be
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* appreciated but is not required.
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* 2. Altered source versions must be plainly marked as such, and must not be
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* misrepresented as being the original software.
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* 3. This notice may not be removed or altered from any source distribution.
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*/
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#define JPEG_INTERNALS
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#include "../../jinclude.h"
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#include "../../jpeglib.h"
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#include "../../jsimd.h"
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#include "../../jdct.h"
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#include "../../jsimddct.h"
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#include "../jsimd.h"
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#include <altivec.h>
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/* Common code */
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#define __4X(a) a, a, a, a
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#define __4X2(a, b) a, b, a, b, a, b, a, b
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#define __8X(a) __4X(a), __4X(a)
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#define __16X(a) __8X(a), __8X(a)
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#define TRANSPOSE(row, col) { \
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__vector short row04l, row04h, row15l, row15h, \
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row26l, row26h, row37l, row37h; \
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__vector short col01e, col01o, col23e, col23o, \
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col45e, col45o, col67e, col67o; \
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\
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/* transpose coefficients (phase 1) */ \
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row04l = vec_mergeh(row##0, row##4); /* row04l=(00 40 01 41 02 42 03 43) */ \
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row04h = vec_mergel(row##0, row##4); /* row04h=(04 44 05 45 06 46 07 47) */ \
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row15l = vec_mergeh(row##1, row##5); /* row15l=(10 50 11 51 12 52 13 53) */ \
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row15h = vec_mergel(row##1, row##5); /* row15h=(14 54 15 55 16 56 17 57) */ \
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row26l = vec_mergeh(row##2, row##6); /* row26l=(20 60 21 61 22 62 23 63) */ \
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row26h = vec_mergel(row##2, row##6); /* row26h=(24 64 25 65 26 66 27 67) */ \
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row37l = vec_mergeh(row##3, row##7); /* row37l=(30 70 31 71 32 72 33 73) */ \
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row37h = vec_mergel(row##3, row##7); /* row37h=(34 74 35 75 36 76 37 77) */ \
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\
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/* transpose coefficients (phase 2) */ \
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col01e = vec_mergeh(row04l, row26l); /* col01e=(00 20 40 60 01 21 41 61) */ \
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col23e = vec_mergel(row04l, row26l); /* col23e=(02 22 42 62 03 23 43 63) */ \
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col45e = vec_mergeh(row04h, row26h); /* col45e=(04 24 44 64 05 25 45 65) */ \
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col67e = vec_mergel(row04h, row26h); /* col67e=(06 26 46 66 07 27 47 67) */ \
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col01o = vec_mergeh(row15l, row37l); /* col01o=(10 30 50 70 11 31 51 71) */ \
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col23o = vec_mergel(row15l, row37l); /* col23o=(12 32 52 72 13 33 53 73) */ \
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col45o = vec_mergeh(row15h, row37h); /* col45o=(14 34 54 74 15 35 55 75) */ \
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col67o = vec_mergel(row15h, row37h); /* col67o=(16 36 56 76 17 37 57 77) */ \
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\
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/* transpose coefficients (phase 3) */ \
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col##0 = vec_mergeh(col01e, col01o); /* col0=(00 10 20 30 40 50 60 70) */ \
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col##1 = vec_mergel(col01e, col01o); /* col1=(01 11 21 31 41 51 61 71) */ \
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col##2 = vec_mergeh(col23e, col23o); /* col2=(02 12 22 32 42 52 62 72) */ \
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col##3 = vec_mergel(col23e, col23o); /* col3=(03 13 23 33 43 53 63 73) */ \
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col##4 = vec_mergeh(col45e, col45o); /* col4=(04 14 24 34 44 54 64 74) */ \
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col##5 = vec_mergel(col45e, col45o); /* col5=(05 15 25 35 45 55 65 75) */ \
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col##6 = vec_mergeh(col67e, col67o); /* col6=(06 16 26 36 46 56 66 76) */ \
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col##7 = vec_mergel(col67e, col67o); /* col7=(07 17 27 37 47 57 67 77) */ \
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}
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#ifndef min
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#define min(a, b) ((a) < (b) ? (a) : (b))
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#endif
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/* Macros to abstract big/little endian bit twiddling */
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#ifdef __BIG_ENDIAN__
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#define VEC_LD(a, b) vec_ld(a, b)
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#define VEC_ST(a, b, c) vec_st(a, b, c)
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#define VEC_UNPACKHU(a) vec_mergeh(pb_zero, a)
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#define VEC_UNPACKLU(a) vec_mergel(pb_zero, a)
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#else
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#define VEC_LD(a, b) vec_vsx_ld(a, b)
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#define VEC_ST(a, b, c) vec_vsx_st(a, b, c)
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#define VEC_UNPACKHU(a) vec_mergeh(a, pb_zero)
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#define VEC_UNPACKLU(a) vec_mergel(a, pb_zero)
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#endif
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#if defined(__clang__)
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#pragma clang diagnostic ignored "-Wc99-extensions"
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#pragma clang diagnostic ignored "-Wshadow"
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#elif defined(__GNUC__)
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#pragma GCC diagnostic ignored "-Wpedantic"
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#pragma GCC diagnostic ignored "-Wshadow"
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#endif
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