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19c791cdac6df84418c66eb9d67cfa9703bc2461
mozjpeg/simd/powerpc/jidctint-altivec.c
DRC 19c791cdac Improve code formatting consistency 
With rare exceptions ...
- Always separate line continuation characters by one space from
  preceding code.
- Always use two-space indentation.  Never use tabs.
- Always use K&R-style conditional blocks.
- Always surround operators with spaces, except in raw assembly code.
- Always put a space after, but not before, a comma.
- Never put a space between type casts and variables/function calls.
- Never put a space between the function name and the argument list in
  function declarations and prototypes.
- Always surround braces ('{' and '}') with spaces.
- Always surround statements (if, for, else, catch, while, do, switch)
  with spaces.
- Always attach pointer symbols ('*' and '**') to the variable or
  function name.
- Always precede pointer symbols ('*' and '**') by a space in type
  casts.
- Use the MIN() macro from jpegint.h within the libjpeg and TurboJPEG
  API libraries (using min() from tjutil.h is still necessary for
  TJBench.)
- Where it makes sense (particularly in the TurboJPEG code), put a blank
  line after variable declaration blocks.
- Always separate statements in one-liners by two spaces.

The purpose of this was to ease maintenance on my part and also to make
it easier for contributors to figure out how to format patch
submissions.  This was admittedly confusing (even to me sometimes) when
we had 3 or 4 different style conventions in the same source tree.  The
new convention is more consistent with the formatting of other OSS code
bases.

This commit corrects deviations from the chosen formatting style in the
libjpeg API code and reformats the TurboJPEG API code such that it
conforms to the same standard.

NOTES:
- Although it is no longer necessary for the function name in function
  declarations to begin in Column 1 (this was historically necessary
  because of the ansi2knr utility, which allowed libjpeg to be built
  with non-ANSI compilers), we retain that formatting for the libjpeg
  code because it improves readability when using libjpeg's function
  attribute macros (GLOBAL(), etc.)
- This reformatting project was accomplished with the help of AStyle and
  Uncrustify, although neither was completely up to the task, and thus
  a great deal of manual tweaking was required.  Note to developers of
  code formatting utilities:  the libjpeg-turbo code base is an
  excellent test bed, because AFAICT, it breaks every single one of the
  utilities that are currently available.
- The legacy (MMX, SSE, 3DNow!) assembly code for i386 has been
  formatted to match the SSE2 code (refer to
  ff5685d5344273df321eb63a005eaae19d2496e3.)  I hadn't intended to
  bother with this, but the Loongson MMI implementation demonstrated
  that there is still academic value to the MMX implementation, as an
  algorithmic model for other 64-bit vector implementations.  Thus, it
  is desirable to improve its readability in the same manner as that of
  the SSE2 implementation.
2018-03-16 02:14:34 -05:00

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/*
* AltiVec optimizations for libjpeg-turbo
*
* Copyright (C) 2014-2015, D. R. Commander. All Rights Reserved.
*
* This software is provided 'as-is', without any express or implied
* warranty. In no event will the authors be held liable for any damages
* arising from the use of this software.
*
* Permission is granted to anyone to use this software for any purpose,
* including commercial applications, and to alter it and redistribute it
* freely, subject to the following restrictions:
*
* 1. The origin of this software must not be misrepresented; you must not
* claim that you wrote the original software. If you use this software
* in a product, an acknowledgment in the product documentation would be
* appreciated but is not required.
* 2. Altered source versions must be plainly marked as such, and must not be
* misrepresented as being the original software.
* 3. This notice may not be removed or altered from any source distribution.
*/
/* SLOW INTEGER INVERSE DCT */
#include "jsimd_altivec.h"
#define F_0_298 2446 /* FIX(0.298631336) */
#define F_0_390 3196 /* FIX(0.390180644) */
#define F_0_541 4433 /* FIX(0.541196100) */
#define F_0_765 6270 /* FIX(0.765366865) */
#define F_0_899 7373 /* FIX(0.899976223) */
#define F_1_175 9633 /* FIX(1.175875602) */
#define F_1_501 12299 /* FIX(1.501321110) */
#define F_1_847 15137 /* FIX(1.847759065) */
#define F_1_961 16069 /* FIX(1.961570560) */
#define F_2_053 16819 /* FIX(2.053119869) */
#define F_2_562 20995 /* FIX(2.562915447) */
#define F_3_072 25172 /* FIX(3.072711026) */
#define CONST_BITS 13
#define PASS1_BITS 2
#define DESCALE_P1 (CONST_BITS - PASS1_BITS)
#define DESCALE_P2 (CONST_BITS + PASS1_BITS + 3)
#define DO_IDCT(in, PASS) { \
/* Even part \
* \
* (Original) \
* z1 = (z2 + z3) * 0.541196100; \
* tmp2 = z1 + z3 * -1.847759065; \
* tmp3 = z1 + z2 * 0.765366865; \
* \
* (This implementation) \
* tmp2 = z2 * 0.541196100 + z3 * (0.541196100 - 1.847759065); \
* tmp3 = z2 * (0.541196100 + 0.765366865) + z3 * 0.541196100; \
*/ \
\
in##26l = vec_mergeh(in##2, in##6); \
in##26h = vec_mergel(in##2, in##6); \
\
tmp3l = vec_msums(in##26l, pw_f130_f054, pd_zero); \
tmp3h = vec_msums(in##26h, pw_f130_f054, pd_zero); \
tmp2l = vec_msums(in##26l, pw_f054_mf130, pd_zero); \
tmp2h = vec_msums(in##26h, pw_f054_mf130, pd_zero); \
\
tmp0 = vec_add(in##0, in##4); \
tmp1 = vec_sub(in##0, in##4); \
\
tmp0l = vec_unpackh(tmp0); \
tmp0h = vec_unpackl(tmp0); \
tmp0l = vec_sl(tmp0l, const_bits); \
tmp0h = vec_sl(tmp0h, const_bits); \
tmp0l = vec_add(tmp0l, pd_descale_p##PASS); \
tmp0h = vec_add(tmp0h, pd_descale_p##PASS); \
\
tmp10l = vec_add(tmp0l, tmp3l); \
tmp10h = vec_add(tmp0h, tmp3h); \
tmp13l = vec_sub(tmp0l, tmp3l); \
tmp13h = vec_sub(tmp0h, tmp3h); \
\
tmp1l = vec_unpackh(tmp1); \
tmp1h = vec_unpackl(tmp1); \
tmp1l = vec_sl(tmp1l, const_bits); \
tmp1h = vec_sl(tmp1h, const_bits); \
tmp1l = vec_add(tmp1l, pd_descale_p##PASS); \
tmp1h = vec_add(tmp1h, pd_descale_p##PASS); \
\
tmp11l = vec_add(tmp1l, tmp2l); \
tmp11h = vec_add(tmp1h, tmp2h); \
tmp12l = vec_sub(tmp1l, tmp2l); \
tmp12h = vec_sub(tmp1h, tmp2h); \
\
/* Odd part */ \
\
z3 = vec_add(in##3, in##7); \
z4 = vec_add(in##1, in##5); \
\
/* (Original) \
* z5 = (z3 + z4) * 1.175875602; \
* z3 = z3 * -1.961570560; z4 = z4 * -0.390180644; \
* z3 += z5; z4 += z5; \
* \
* (This implementation) \
* z3 = z3 * (1.175875602 - 1.961570560) + z4 * 1.175875602; \
* z4 = z3 * 1.175875602 + z4 * (1.175875602 - 0.390180644); \
*/ \
\
z34l = vec_mergeh(z3, z4); \
z34h = vec_mergel(z3, z4); \
\
z3l = vec_msums(z34l, pw_mf078_f117, pd_zero); \
z3h = vec_msums(z34h, pw_mf078_f117, pd_zero); \
z4l = vec_msums(z34l, pw_f117_f078, pd_zero); \
z4h = vec_msums(z34h, pw_f117_f078, pd_zero); \
\
/* (Original) \
* z1 = tmp0 + tmp3; z2 = tmp1 + tmp2; \
* tmp0 = tmp0 * 0.298631336; tmp1 = tmp1 * 2.053119869; \
* tmp2 = tmp2 * 3.072711026; tmp3 = tmp3 * 1.501321110; \
* z1 = z1 * -0.899976223; z2 = z2 * -2.562915447; \
* tmp0 += z1 + z3; tmp1 += z2 + z4; \
* tmp2 += z2 + z3; tmp3 += z1 + z4; \
* \
* (This implementation) \
* tmp0 = tmp0 * (0.298631336 - 0.899976223) + tmp3 * -0.899976223; \
* tmp1 = tmp1 * (2.053119869 - 2.562915447) + tmp2 * -2.562915447; \
* tmp2 = tmp1 * -2.562915447 + tmp2 * (3.072711026 - 2.562915447); \
* tmp3 = tmp0 * -0.899976223 + tmp3 * (1.501321110 - 0.899976223); \
* tmp0 += z3; tmp1 += z4; \
* tmp2 += z3; tmp3 += z4; \
*/ \
\
in##71l = vec_mergeh(in##7, in##1); \
in##71h = vec_mergel(in##7, in##1); \
\
tmp0l = vec_msums(in##71l, pw_mf060_mf089, z3l); \
tmp0h = vec_msums(in##71h, pw_mf060_mf089, z3h); \
tmp3l = vec_msums(in##71l, pw_mf089_f060, z4l); \
tmp3h = vec_msums(in##71h, pw_mf089_f060, z4h); \
\
in##53l = vec_mergeh(in##5, in##3); \
in##53h = vec_mergel(in##5, in##3); \
\
tmp1l = vec_msums(in##53l, pw_mf050_mf256, z4l); \
tmp1h = vec_msums(in##53h, pw_mf050_mf256, z4h); \
tmp2l = vec_msums(in##53l, pw_mf256_f050, z3l); \
tmp2h = vec_msums(in##53h, pw_mf256_f050, z3h); \
\
/* Final output stage */ \
\
out0l = vec_add(tmp10l, tmp3l); \
out0h = vec_add(tmp10h, tmp3h); \
out7l = vec_sub(tmp10l, tmp3l); \
out7h = vec_sub(tmp10h, tmp3h); \
\
out0l = vec_sra(out0l, descale_p##PASS); \
out0h = vec_sra(out0h, descale_p##PASS); \
out7l = vec_sra(out7l, descale_p##PASS); \
out7h = vec_sra(out7h, descale_p##PASS); \
\
out0 = vec_pack(out0l, out0h); \
out7 = vec_pack(out7l, out7h); \
\
out1l = vec_add(tmp11l, tmp2l); \
out1h = vec_add(tmp11h, tmp2h); \
out6l = vec_sub(tmp11l, tmp2l); \
out6h = vec_sub(tmp11h, tmp2h); \
\
out1l = vec_sra(out1l, descale_p##PASS); \
out1h = vec_sra(out1h, descale_p##PASS); \
out6l = vec_sra(out6l, descale_p##PASS); \
out6h = vec_sra(out6h, descale_p##PASS); \
\
out1 = vec_pack(out1l, out1h); \
out6 = vec_pack(out6l, out6h); \
\
out2l = vec_add(tmp12l, tmp1l); \
out2h = vec_add(tmp12h, tmp1h); \
out5l = vec_sub(tmp12l, tmp1l); \
out5h = vec_sub(tmp12h, tmp1h); \
\
out2l = vec_sra(out2l, descale_p##PASS); \
out2h = vec_sra(out2h, descale_p##PASS); \
out5l = vec_sra(out5l, descale_p##PASS); \
out5h = vec_sra(out5h, descale_p##PASS); \
\
out2 = vec_pack(out2l, out2h); \
out5 = vec_pack(out5l, out5h); \
\
out3l = vec_add(tmp13l, tmp0l); \
out3h = vec_add(tmp13h, tmp0h); \
out4l = vec_sub(tmp13l, tmp0l); \
out4h = vec_sub(tmp13h, tmp0h); \
\
out3l = vec_sra(out3l, descale_p##PASS); \
out3h = vec_sra(out3h, descale_p##PASS); \
out4l = vec_sra(out4l, descale_p##PASS); \
out4h = vec_sra(out4h, descale_p##PASS); \
\
out3 = vec_pack(out3l, out3h); \
out4 = vec_pack(out4l, out4h); \
}
void jsimd_idct_islow_altivec(void *dct_table_, JCOEFPTR coef_block,
JSAMPARRAY output_buf, JDIMENSION output_col)
{
short *dct_table = (short *)dct_table_;
int *outptr;
__vector short row0, row1, row2, row3, row4, row5, row6, row7,
col0, col1, col2, col3, col4, col5, col6, col7,
quant0, quant1, quant2, quant3, quant4, quant5, quant6, quant7,
tmp0, tmp1, tmp2, tmp3, z3, z4,
z34l, z34h, col71l, col71h, col26l, col26h, col53l, col53h,
row71l, row71h, row26l, row26h, row53l, row53h,
out0, out1, out2, out3, out4, out5, out6, out7;
__vector int tmp0l, tmp0h, tmp1l, tmp1h, tmp2l, tmp2h, tmp3l, tmp3h,
tmp10l, tmp10h, tmp11l, tmp11h, tmp12l, tmp12h, tmp13l, tmp13h,
z3l, z3h, z4l, z4h,
out0l, out0h, out1l, out1h, out2l, out2h, out3l, out3h, out4l, out4h,
out5l, out5h, out6l, out6h, out7l, out7h;
__vector signed char outb;
/* Constants */
__vector short pw_zero = { __8X(0) },
pw_f130_f054 = { __4X2(F_0_541 + F_0_765, F_0_541) },
pw_f054_mf130 = { __4X2(F_0_541, F_0_541 - F_1_847) },
pw_mf078_f117 = { __4X2(F_1_175 - F_1_961, F_1_175) },
pw_f117_f078 = { __4X2(F_1_175, F_1_175 - F_0_390) },
pw_mf060_mf089 = { __4X2(F_0_298 - F_0_899, -F_0_899) },
pw_mf089_f060 = { __4X2(-F_0_899, F_1_501 - F_0_899) },
pw_mf050_mf256 = { __4X2(F_2_053 - F_2_562, -F_2_562) },
pw_mf256_f050 = { __4X2(-F_2_562, F_3_072 - F_2_562) };
__vector unsigned short pass1_bits = { __8X(PASS1_BITS) };
__vector int pd_zero = { __4X(0) },
pd_descale_p1 = { __4X(1 << (DESCALE_P1 - 1)) },
pd_descale_p2 = { __4X(1 << (DESCALE_P2 - 1)) };
__vector unsigned int descale_p1 = { __4X(DESCALE_P1) },
descale_p2 = { __4X(DESCALE_P2) },
const_bits = { __4X(CONST_BITS) };
__vector signed char pb_centerjsamp = { __16X(CENTERJSAMPLE) };
/* Pass 1: process columns */
col0 = vec_ld(0, coef_block);
col1 = vec_ld(16, coef_block);
col2 = vec_ld(32, coef_block);
col3 = vec_ld(48, coef_block);
col4 = vec_ld(64, coef_block);
col5 = vec_ld(80, coef_block);
col6 = vec_ld(96, coef_block);
col7 = vec_ld(112, coef_block);
tmp1 = vec_or(col1, col2);
tmp2 = vec_or(col3, col4);
tmp1 = vec_or(tmp1, tmp2);
tmp3 = vec_or(col5, col6);
tmp3 = vec_or(tmp3, col7);
tmp1 = vec_or(tmp1, tmp3);
quant0 = vec_ld(0, dct_table);
col0 = vec_mladd(col0, quant0, pw_zero);
if (vec_all_eq(tmp1, pw_zero)) {
/* AC terms all zero */
col0 = vec_sl(col0, pass1_bits);
row0 = vec_splat(col0, 0);
row1 = vec_splat(col0, 1);
row2 = vec_splat(col0, 2);
row3 = vec_splat(col0, 3);
row4 = vec_splat(col0, 4);
row5 = vec_splat(col0, 5);
row6 = vec_splat(col0, 6);
row7 = vec_splat(col0, 7);
} else {
quant1 = vec_ld(16, dct_table);
quant2 = vec_ld(32, dct_table);
quant3 = vec_ld(48, dct_table);
quant4 = vec_ld(64, dct_table);
quant5 = vec_ld(80, dct_table);
quant6 = vec_ld(96, dct_table);
quant7 = vec_ld(112, dct_table);
col1 = vec_mladd(col1, quant1, pw_zero);
col2 = vec_mladd(col2, quant2, pw_zero);
col3 = vec_mladd(col3, quant3, pw_zero);
col4 = vec_mladd(col4, quant4, pw_zero);
col5 = vec_mladd(col5, quant5, pw_zero);
col6 = vec_mladd(col6, quant6, pw_zero);
col7 = vec_mladd(col7, quant7, pw_zero);
DO_IDCT(col, 1);
TRANSPOSE(out, row);
}
/* Pass 2: process rows */
DO_IDCT(row, 2);
TRANSPOSE(out, col);
outb = vec_packs(col0, col0);
outb = vec_add(outb, pb_centerjsamp);
outptr = (int *)(output_buf[0] + output_col);
vec_ste((__vector int)outb, 0, outptr);
vec_ste((__vector int)outb, 4, outptr);
outb = vec_packs(col1, col1);
outb = vec_add(outb, pb_centerjsamp);
outptr = (int *)(output_buf[1] + output_col);
vec_ste((__vector int)outb, 0, outptr);
vec_ste((__vector int)outb, 4, outptr);
outb = vec_packs(col2, col2);
outb = vec_add(outb, pb_centerjsamp);
outptr = (int *)(output_buf[2] + output_col);
vec_ste((__vector int)outb, 0, outptr);
vec_ste((__vector int)outb, 4, outptr);
outb = vec_packs(col3, col3);
outb = vec_add(outb, pb_centerjsamp);
outptr = (int *)(output_buf[3] + output_col);
vec_ste((__vector int)outb, 0, outptr);
vec_ste((__vector int)outb, 4, outptr);
outb = vec_packs(col4, col4);
outb = vec_add(outb, pb_centerjsamp);
outptr = (int *)(output_buf[4] + output_col);
vec_ste((__vector int)outb, 0, outptr);
vec_ste((__vector int)outb, 4, outptr);
outb = vec_packs(col5, col5);
outb = vec_add(outb, pb_centerjsamp);
outptr = (int *)(output_buf[5] + output_col);
vec_ste((__vector int)outb, 0, outptr);
vec_ste((__vector int)outb, 4, outptr);
outb = vec_packs(col6, col6);
outb = vec_add(outb, pb_centerjsamp);
outptr = (int *)(output_buf[6] + output_col);
vec_ste((__vector int)outb, 0, outptr);
vec_ste((__vector int)outb, 4, outptr);
outb = vec_packs(col7, col7);
outb = vec_add(outb, pb_centerjsamp);
outptr = (int *)(output_buf[7] + output_col);
vec_ste((__vector int)outb, 0, outptr);
vec_ste((__vector int)outb, 4, outptr);
}
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