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Diffstat (limited to 'media/libjpeg/simd/mips64/jidctfst-mmi.c')
-rw-r--r--media/libjpeg/simd/mips64/jidctfst-mmi.c395
1 files changed, 395 insertions, 0 deletions
diff --git a/media/libjpeg/simd/mips64/jidctfst-mmi.c b/media/libjpeg/simd/mips64/jidctfst-mmi.c
new file mode 100644
index 0000000000..503bb35a3c
--- /dev/null
+++ b/media/libjpeg/simd/mips64/jidctfst-mmi.c
@@ -0,0 +1,395 @@
+/*
+ * Loongson MMI optimizations for libjpeg-turbo
+ *
+ * Copyright (C) 2014-2015, 2018-2019, D. R. Commander. All Rights Reserved.
+ * Copyright (C) 2016-2018, Loongson Technology Corporation Limited, BeiJing.
+ * All Rights Reserved.
+ * Authors: LiuQingfa <liuqingfa-hf@loongson.cn>
+ *
+ * Based on the x86 SIMD extension for IJG JPEG library
+ * Copyright (C) 1999-2006, MIYASAKA Masaru.
+ *
+ * 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.
+ */
+
+/* FAST INTEGER INVERSE DCT */
+
+#include "jsimd_mmi.h"
+
+
+#define CONST_BITS 8
+#define PASS1_BITS 2
+
+#define FIX_1_082 ((short)277) /* FIX(1.082392200) */
+#define FIX_1_414 ((short)362) /* FIX(1.414213562) */
+#define FIX_1_847 ((short)473) /* FIX(1.847759065) */
+#define FIX_2_613 ((short)669) /* FIX(2.613125930) */
+#define FIX_1_613 ((short)(FIX_2_613 - 256 * 3)) /* FIX(2.613125930) - FIX(1) */
+
+#define PRE_MULTIPLY_SCALE_BITS 2
+#define CONST_SHIFT (16 - PRE_MULTIPLY_SCALE_BITS - CONST_BITS)
+
+enum const_index {
+ index_PW_F1082,
+ index_PW_F1414,
+ index_PW_F1847,
+ index_PW_MF1613,
+ index_PB_CENTERJSAMP
+};
+
+static uint64_t const_value[] = {
+ _uint64_set1_pi16(FIX_1_082 << CONST_SHIFT),
+ _uint64_set1_pi16(FIX_1_414 << CONST_SHIFT),
+ _uint64_set1_pi16(FIX_1_847 << CONST_SHIFT),
+ _uint64_set1_pi16(-FIX_1_613 << CONST_SHIFT),
+ _uint64_set1_pi8(CENTERJSAMPLE)
+};
+
+#define PW_F1414 get_const_value(index_PW_F1414)
+#define PW_F1847 get_const_value(index_PW_F1847)
+#define PW_MF1613 get_const_value(index_PW_MF1613)
+#define PW_F1082 get_const_value(index_PW_F1082)
+#define PB_CENTERJSAMP get_const_value(index_PB_CENTERJSAMP)
+
+
+#define test_m32_zero(mm32) (!(*(uint32_t *)&mm32))
+#define test_m64_zero(mm64) (!(*(uint64_t *)&mm64))
+
+
+#define DO_IDCT_COMMON() { \
+ tmp7 = _mm_add_pi16(z11, z13); \
+ \
+ tmp11 = _mm_sub_pi16(z11, z13); \
+ tmp11 = _mm_slli_pi16(tmp11, PRE_MULTIPLY_SCALE_BITS); \
+ tmp11 = _mm_mulhi_pi16(tmp11, PW_F1414); \
+ \
+ tmp10 = _mm_slli_pi16(z12, PRE_MULTIPLY_SCALE_BITS); \
+ tmp12 = _mm_slli_pi16(z10, PRE_MULTIPLY_SCALE_BITS); \
+ \
+ /* To avoid overflow... \
+ * \
+ * (Original) \
+ * tmp12 = -2.613125930 * z10 + z5; \
+ * \
+ * (This implementation) \
+ * tmp12 = (-1.613125930 - 1) * z10 + z5; \
+ * = -1.613125930 * z10 - z10 + z5; \
+ */ \
+ \
+ z5 = _mm_add_pi16(tmp10, tmp12); \
+ z5 = _mm_mulhi_pi16(z5, PW_F1847); \
+ \
+ tmp10 = _mm_mulhi_pi16(tmp10, PW_F1082); \
+ tmp10 = _mm_sub_pi16(tmp10, z5); \
+ tmp12 = _mm_mulhi_pi16(tmp12, PW_MF1613); \
+ tmp12 = _mm_sub_pi16(tmp12, z10); \
+ tmp12 = _mm_sub_pi16(tmp12, z10); \
+ tmp12 = _mm_sub_pi16(tmp12, z10); \
+ tmp12 = _mm_add_pi16(tmp12, z5); \
+ \
+ /* Final output stage */ \
+ \
+ tmp6 = _mm_sub_pi16(tmp12, tmp7); \
+ tmp5 = _mm_sub_pi16(tmp11, tmp6); \
+ tmp4 = _mm_add_pi16(tmp10, tmp5); \
+ \
+ out0 = _mm_add_pi16(tmp0, tmp7); \
+ out7 = _mm_sub_pi16(tmp0, tmp7); \
+ out1 = _mm_add_pi16(tmp1, tmp6); \
+ out6 = _mm_sub_pi16(tmp1, tmp6); \
+ \
+ out2 = _mm_add_pi16(tmp2, tmp5); \
+ out5 = _mm_sub_pi16(tmp2, tmp5); \
+ out4 = _mm_add_pi16(tmp3, tmp4); \
+ out3 = _mm_sub_pi16(tmp3, tmp4); \
+}
+
+#define DO_IDCT_PASS1(iter) { \
+ __m64 col0l, col1l, col2l, col3l, col4l, col5l, col6l, col7l; \
+ __m64 quant0l, quant1l, quant2l, quant3l; \
+ __m64 quant4l, quant5l, quant6l, quant7l; \
+ __m64 row01a, row01b, row01c, row01d, row23a, row23b, row23c, row23d; \
+ __m64 row0l, row0h, row1l, row1h, row2l, row2h, row3l, row3h; \
+ __m32 col0a, col1a, mm0; \
+ \
+ col0a = _mm_load_si32((__m32 *)&inptr[DCTSIZE * 1]); \
+ col1a = _mm_load_si32((__m32 *)&inptr[DCTSIZE * 2]); \
+ mm0 = _mm_or_si32(col0a, col1a); \
+ \
+ if (test_m32_zero(mm0)) { \
+ __m64 mm1, mm2; \
+ \
+ col0l = _mm_load_si64((__m64 *)&inptr[DCTSIZE * 0]); \
+ col1l = _mm_load_si64((__m64 *)&inptr[DCTSIZE * 1]); \
+ col2l = _mm_load_si64((__m64 *)&inptr[DCTSIZE * 2]); \
+ col3l = _mm_load_si64((__m64 *)&inptr[DCTSIZE * 3]); \
+ col4l = _mm_load_si64((__m64 *)&inptr[DCTSIZE * 4]); \
+ col5l = _mm_load_si64((__m64 *)&inptr[DCTSIZE * 5]); \
+ col6l = _mm_load_si64((__m64 *)&inptr[DCTSIZE * 6]); \
+ col7l = _mm_load_si64((__m64 *)&inptr[DCTSIZE * 7]); \
+ \
+ mm1 = _mm_or_si64(col1l, col3l); \
+ mm2 = _mm_or_si64(col2l, col4l); \
+ mm1 = _mm_or_si64(mm1, col5l); \
+ mm2 = _mm_or_si64(mm2, col6l); \
+ mm1 = _mm_or_si64(mm1, col7l); \
+ mm1 = _mm_or_si64(mm1, mm2); \
+ \
+ if (test_m64_zero(mm1)) { \
+ __m64 dcval, dcvall, dcvalh, row0, row1, row2, row3; \
+ \
+ /* AC terms all zero */ \
+ \
+ quant0l = _mm_load_si64((__m64 *)&quantptr[DCTSIZE * 0]); \
+ \
+ dcval = _mm_mullo_pi16(col0l, quant0l); /* dcval=(00 10 20 30) */ \
+ \
+ dcvall = _mm_unpacklo_pi16(dcval, dcval); /* dcvall=(00 00 10 10) */ \
+ dcvalh = _mm_unpackhi_pi16(dcval, dcval); /* dcvalh=(20 20 30 30) */ \
+ \
+ row0 = _mm_unpacklo_pi32(dcvall, dcvall); /* row0=(00 00 00 00) */ \
+ row1 = _mm_unpackhi_pi32(dcvall, dcvall); /* row1=(10 10 10 10) */ \
+ row2 = _mm_unpacklo_pi32(dcvalh, dcvalh); /* row2=(20 20 20 20) */ \
+ row3 = _mm_unpackhi_pi32(dcvalh, dcvalh); /* row3=(30 30 30 30) */ \
+ \
+ _mm_store_si64((__m64 *)&wsptr[DCTSIZE * 0], row0); \
+ _mm_store_si64((__m64 *)&wsptr[DCTSIZE * 0 + 4], row0); \
+ _mm_store_si64((__m64 *)&wsptr[DCTSIZE * 1], row1); \
+ _mm_store_si64((__m64 *)&wsptr[DCTSIZE * 1 + 4], row1); \
+ _mm_store_si64((__m64 *)&wsptr[DCTSIZE * 2], row2); \
+ _mm_store_si64((__m64 *)&wsptr[DCTSIZE * 2 + 4], row2); \
+ _mm_store_si64((__m64 *)&wsptr[DCTSIZE * 3], row3); \
+ _mm_store_si64((__m64 *)&wsptr[DCTSIZE * 3 + 4], row3); \
+ \
+ goto nextcolumn##iter; \
+ } \
+ } \
+ \
+ /* Even part */ \
+ \
+ col0l = _mm_load_si64((__m64 *)&inptr[DCTSIZE * 0]); /* (00 10 20 30) */ \
+ col2l = _mm_load_si64((__m64 *)&inptr[DCTSIZE * 2]); /* (02 12 22 32) */ \
+ col4l = _mm_load_si64((__m64 *)&inptr[DCTSIZE * 4]); /* (04 14 24 34) */ \
+ col6l = _mm_load_si64((__m64 *)&inptr[DCTSIZE * 6]); /* (06 16 26 36) */ \
+ \
+ quant0l = _mm_load_si64((__m64 *)&quantptr[DCTSIZE * 0]); \
+ quant2l = _mm_load_si64((__m64 *)&quantptr[DCTSIZE * 2]); \
+ quant4l = _mm_load_si64((__m64 *)&quantptr[DCTSIZE * 4]); \
+ quant6l = _mm_load_si64((__m64 *)&quantptr[DCTSIZE * 6]); \
+ \
+ tmp0 = _mm_mullo_pi16(col0l, quant0l); \
+ tmp1 = _mm_mullo_pi16(col2l, quant2l); \
+ tmp2 = _mm_mullo_pi16(col4l, quant4l); \
+ tmp3 = _mm_mullo_pi16(col6l, quant6l); \
+ \
+ tmp10 = _mm_add_pi16(tmp0, tmp2); \
+ tmp11 = _mm_sub_pi16(tmp0, tmp2); \
+ tmp13 = _mm_add_pi16(tmp1, tmp3); \
+ \
+ tmp12 = _mm_sub_pi16(tmp1, tmp3); \
+ tmp12 = _mm_slli_pi16(tmp12, PRE_MULTIPLY_SCALE_BITS); \
+ tmp12 = _mm_mulhi_pi16(tmp12, PW_F1414); \
+ tmp12 = _mm_sub_pi16(tmp12, tmp13); \
+ \
+ tmp0 = _mm_add_pi16(tmp10, tmp13); \
+ tmp3 = _mm_sub_pi16(tmp10, tmp13); \
+ tmp1 = _mm_add_pi16(tmp11, tmp12); \
+ tmp2 = _mm_sub_pi16(tmp11, tmp12); \
+ \
+ /* Odd part */ \
+ \
+ col1l = _mm_load_si64((__m64 *)&inptr[DCTSIZE * 1]); /* (01 11 21 31) */ \
+ col3l = _mm_load_si64((__m64 *)&inptr[DCTSIZE * 3]); /* (03 13 23 33) */ \
+ col5l = _mm_load_si64((__m64 *)&inptr[DCTSIZE * 5]); /* (05 15 25 35) */ \
+ col7l = _mm_load_si64((__m64 *)&inptr[DCTSIZE * 7]); /* (07 17 27 37) */ \
+ \
+ quant1l = _mm_load_si64((__m64 *)&quantptr[DCTSIZE * 1]); \
+ quant3l = _mm_load_si64((__m64 *)&quantptr[DCTSIZE * 3]); \
+ quant5l = _mm_load_si64((__m64 *)&quantptr[DCTSIZE * 5]); \
+ quant7l = _mm_load_si64((__m64 *)&quantptr[DCTSIZE * 7]); \
+ \
+ tmp4 = _mm_mullo_pi16(col1l, quant1l); \
+ tmp5 = _mm_mullo_pi16(col3l, quant3l); \
+ tmp6 = _mm_mullo_pi16(col5l, quant5l); \
+ tmp7 = _mm_mullo_pi16(col7l, quant7l); \
+ \
+ z13 = _mm_add_pi16(tmp6, tmp5); \
+ z10 = _mm_sub_pi16(tmp6, tmp5); \
+ z11 = _mm_add_pi16(tmp4, tmp7); \
+ z12 = _mm_sub_pi16(tmp4, tmp7); \
+ \
+ DO_IDCT_COMMON() \
+ \
+ /* out0=(00 10 20 30), out1=(01 11 21 31) */ \
+ /* out2=(02 12 22 32), out3=(03 13 23 33) */ \
+ /* out4=(04 14 24 34), out5=(05 15 25 35) */ \
+ /* out6=(06 16 26 36), out7=(07 17 27 37) */ \
+ \
+ /* Transpose coefficients */ \
+ \
+ row01a = _mm_unpacklo_pi16(out0, out1); /* row01a=(00 01 10 11) */ \
+ row23a = _mm_unpackhi_pi16(out0, out1); /* row23a=(20 21 30 31) */ \
+ row01d = _mm_unpacklo_pi16(out6, out7); /* row01d=(06 07 16 17) */ \
+ row23d = _mm_unpackhi_pi16(out6, out7); /* row23d=(26 27 36 37) */ \
+ \
+ row01b = _mm_unpacklo_pi16(out2, out3); /* row01b=(02 03 12 13) */ \
+ row23b = _mm_unpackhi_pi16(out2, out3); /* row23b=(22 23 32 33) */ \
+ row01c = _mm_unpacklo_pi16(out4, out5); /* row01c=(04 05 14 15) */ \
+ row23c = _mm_unpackhi_pi16(out4, out5); /* row23c=(24 25 34 35) */ \
+ \
+ row0l = _mm_unpacklo_pi32(row01a, row01b); /* row0l=(00 01 02 03) */ \
+ row1l = _mm_unpackhi_pi32(row01a, row01b); /* row1l=(10 11 12 13) */ \
+ row2l = _mm_unpacklo_pi32(row23a, row23b); /* row2l=(20 21 22 23) */ \
+ row3l = _mm_unpackhi_pi32(row23a, row23b); /* row3l=(30 31 32 33) */ \
+ \
+ row0h = _mm_unpacklo_pi32(row01c, row01d); /* row0h=(04 05 06 07) */ \
+ row1h = _mm_unpackhi_pi32(row01c, row01d); /* row1h=(14 15 16 17) */ \
+ row2h = _mm_unpacklo_pi32(row23c, row23d); /* row2h=(24 25 26 27) */ \
+ row3h = _mm_unpackhi_pi32(row23c, row23d); /* row3h=(34 35 36 37) */ \
+ \
+ _mm_store_si64((__m64 *)&wsptr[DCTSIZE * 0], row0l); \
+ _mm_store_si64((__m64 *)&wsptr[DCTSIZE * 0 + 4], row0h); \
+ _mm_store_si64((__m64 *)&wsptr[DCTSIZE * 1], row1l); \
+ _mm_store_si64((__m64 *)&wsptr[DCTSIZE * 1 + 4], row1h); \
+ _mm_store_si64((__m64 *)&wsptr[DCTSIZE * 2], row2l); \
+ _mm_store_si64((__m64 *)&wsptr[DCTSIZE * 2 + 4], row2h); \
+ _mm_store_si64((__m64 *)&wsptr[DCTSIZE * 3], row3l); \
+ _mm_store_si64((__m64 *)&wsptr[DCTSIZE * 3 + 4], row3h); \
+}
+
+#define DO_IDCT_PASS2(ctr) { \
+ __m64 row0l, row1l, row2l, row3l, row4l, row5l, row6l, row7l; \
+ __m64 col0123a, col0123b, col0123c, col0123d; \
+ __m64 col01l, col01h, col23l, col23h; \
+ __m64 col0, col1, col2, col3; \
+ __m64 row06, row17, row24, row35; \
+ \
+ row0l = _mm_load_si64((__m64 *)&wsptr[DCTSIZE * 0]); /* (00 01 02 03) */ \
+ row1l = _mm_load_si64((__m64 *)&wsptr[DCTSIZE * 1]); /* (10 11 12 13) */ \
+ row2l = _mm_load_si64((__m64 *)&wsptr[DCTSIZE * 2]); /* (20 21 22 23) */ \
+ row3l = _mm_load_si64((__m64 *)&wsptr[DCTSIZE * 3]); /* (30 31 32 33) */ \
+ row4l = _mm_load_si64((__m64 *)&wsptr[DCTSIZE * 4]); /* (40 41 42 43) */ \
+ row5l = _mm_load_si64((__m64 *)&wsptr[DCTSIZE * 5]); /* (50 51 52 53) */ \
+ row6l = _mm_load_si64((__m64 *)&wsptr[DCTSIZE * 6]); /* (60 61 62 63) */ \
+ row7l = _mm_load_si64((__m64 *)&wsptr[DCTSIZE * 7]); /* (70 71 72 73) */ \
+ \
+ /* Even part */ \
+ \
+ tmp10 = _mm_add_pi16(row0l, row4l); \
+ tmp11 = _mm_sub_pi16(row0l, row4l); \
+ tmp13 = _mm_add_pi16(row2l, row6l); \
+ \
+ tmp12 = _mm_sub_pi16(row2l, row6l); \
+ tmp12 = _mm_slli_pi16(tmp12, PRE_MULTIPLY_SCALE_BITS); \
+ tmp12 = _mm_mulhi_pi16(tmp12, PW_F1414); \
+ tmp12 = _mm_sub_pi16(tmp12, tmp13); \
+ \
+ tmp0 = _mm_add_pi16(tmp10, tmp13); \
+ tmp3 = _mm_sub_pi16(tmp10, tmp13); \
+ tmp1 = _mm_add_pi16(tmp11, tmp12); \
+ tmp2 = _mm_sub_pi16(tmp11, tmp12); \
+ \
+ /* Odd part */ \
+ \
+ z13 = _mm_add_pi16(row5l, row3l); \
+ z10 = _mm_sub_pi16(row5l, row3l); \
+ z11 = _mm_add_pi16(row1l, row7l); \
+ z12 = _mm_sub_pi16(row1l, row7l); \
+ \
+ DO_IDCT_COMMON() \
+ \
+ /* out0=(00 01 02 03), out1=(10 11 12 13) */ \
+ /* out2=(20 21 22 23), out3=(30 31 32 33) */ \
+ /* out4=(40 41 42 43), out5=(50 51 52 53) */ \
+ /* out6=(60 61 62 63), out7=(70 71 72 73) */ \
+ \
+ out0 = _mm_srai_pi16(out0, PASS1_BITS + 3); \
+ out1 = _mm_srai_pi16(out1, PASS1_BITS + 3); \
+ out2 = _mm_srai_pi16(out2, PASS1_BITS + 3); \
+ out3 = _mm_srai_pi16(out3, PASS1_BITS + 3); \
+ out4 = _mm_srai_pi16(out4, PASS1_BITS + 3); \
+ out5 = _mm_srai_pi16(out5, PASS1_BITS + 3); \
+ out6 = _mm_srai_pi16(out6, PASS1_BITS + 3); \
+ out7 = _mm_srai_pi16(out7, PASS1_BITS + 3); \
+ \
+ row06 = _mm_packs_pi16(out0, out6); /* row06=(00 01 02 03 60 61 62 63) */ \
+ row17 = _mm_packs_pi16(out1, out7); /* row17=(10 11 12 13 70 71 72 73) */ \
+ row24 = _mm_packs_pi16(out2, out4); /* row24=(20 21 22 23 40 41 42 43) */ \
+ row35 = _mm_packs_pi16(out3, out5); /* row35=(30 31 32 33 50 51 52 53) */ \
+ \
+ row06 = _mm_add_pi8(row06, PB_CENTERJSAMP); \
+ row17 = _mm_add_pi8(row17, PB_CENTERJSAMP); \
+ row24 = _mm_add_pi8(row24, PB_CENTERJSAMP); \
+ row35 = _mm_add_pi8(row35, PB_CENTERJSAMP); \
+ \
+ /* Transpose coefficients */ \
+ \
+ col0123a = _mm_unpacklo_pi8(row06, row17); /* col0123a=(00 10 01 11 02 12 03 13) */ \
+ col0123d = _mm_unpackhi_pi8(row06, row17); /* col0123d=(60 70 61 71 62 72 63 73) */ \
+ col0123b = _mm_unpacklo_pi8(row24, row35); /* col0123b=(20 30 21 31 22 32 23 33) */ \
+ col0123c = _mm_unpackhi_pi8(row24, row35); /* col0123c=(40 50 41 51 42 52 43 53) */ \
+ \
+ col01l = _mm_unpacklo_pi16(col0123a, col0123b); /* col01l=(00 10 20 30 01 11 21 31) */ \
+ col23l = _mm_unpackhi_pi16(col0123a, col0123b); /* col23l=(02 12 22 32 03 13 23 33) */ \
+ col01h = _mm_unpacklo_pi16(col0123c, col0123d); /* col01h=(40 50 60 70 41 51 61 71) */ \
+ col23h = _mm_unpackhi_pi16(col0123c, col0123d); /* col23h=(42 52 62 72 43 53 63 73) */ \
+ \
+ col0 = _mm_unpacklo_pi32(col01l, col01h); /* col0=(00 10 20 30 40 50 60 70) */ \
+ col1 = _mm_unpackhi_pi32(col01l, col01h); /* col1=(01 11 21 31 41 51 61 71) */ \
+ col2 = _mm_unpacklo_pi32(col23l, col23h); /* col2=(02 12 22 32 42 52 62 72) */ \
+ col3 = _mm_unpackhi_pi32(col23l, col23h); /* col3=(03 13 23 33 43 53 63 73) */ \
+ \
+ _mm_store_si64((__m64 *)(output_buf[ctr + 0] + output_col), col0); \
+ _mm_store_si64((__m64 *)(output_buf[ctr + 1] + output_col), col1); \
+ _mm_store_si64((__m64 *)(output_buf[ctr + 2] + output_col), col2); \
+ _mm_store_si64((__m64 *)(output_buf[ctr + 3] + output_col), col3); \
+}
+
+void jsimd_idct_ifast_mmi(void *dct_table, JCOEFPTR coef_block,
+ JSAMPARRAY output_buf, JDIMENSION output_col)
+{
+ __m64 tmp0, tmp1, tmp2, tmp3, tmp4, tmp5, tmp6, tmp7;
+ __m64 tmp10, tmp11, tmp12, tmp13;
+ __m64 out0, out1, out2, out3, out4, out5, out6, out7;
+ __m64 z5, z10, z11, z12, z13;
+ JCOEFPTR inptr;
+ ISLOW_MULT_TYPE *quantptr;
+ JCOEF *wsptr;
+ JCOEF workspace[DCTSIZE2]; /* buffers data between passes */
+
+ /* Pass 1: process columns. */
+
+ inptr = coef_block;
+ quantptr = (ISLOW_MULT_TYPE *)dct_table;
+ wsptr = workspace;
+
+ DO_IDCT_PASS1(1)
+nextcolumn1:
+ inptr += 4;
+ quantptr += 4;
+ wsptr += DCTSIZE * 4;
+ DO_IDCT_PASS1(2)
+nextcolumn2:
+
+ /* Pass 2: process rows. */
+
+ wsptr = workspace;
+
+ DO_IDCT_PASS2(0)
+ wsptr += 4;
+ DO_IDCT_PASS2(4)
+}
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