Update libjpeg_turbo to 1.4.90 from https://github.com/libjpeg-turbo/

simd/jsimd_arm64.c

Index: simd/jsimd_arm64.c
diff --git a/simd/jsimd_arm64.c b/simd/jsimd_arm64.c
index 65724cb9ff94a816ffd2706e140333f28656039f..62dbc450c4e147a22ea99cbda7f66f76ddbbb4ee 100644
--- a/simd/jsimd_arm64.c
+++ b/simd/jsimd_arm64.c
@@ -2,7 +2,8 @@
  * jsimd_arm64.c
  *
  * Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB
- * Copyright 2009-2011, 2013-2014 D. R. Commander
+ * Copyright 2009-2011, 2013-2014, 2016 D. R. Commander
+ * Copyright 2015-2016 Matthieu Darbois
  *
  * Based on the x86 SIMD extension for IJG JPEG library,
  * Copyright (C) 1999-2006, MIYASAKA Masaru.
@@ -25,7 +26,84 @@
 #include <string.h>
 #include <ctype.h>
 
+#define JSIMD_FASTLD3 1
+#define JSIMD_FASTST3 2
+#define JSIMD_FASTTBL 4
+
 static unsigned int simd_support = ~0;
+static unsigned int simd_huffman = 1;
+static unsigned int simd_features = JSIMD_FASTLD3 | JSIMD_FASTST3 |
+                                    JSIMD_FASTTBL;
+
+#if defined(__linux__) || defined(ANDROID) || defined(__ANDROID__)
+
+#define SOMEWHAT_SANE_PROC_CPUINFO_SIZE_LIMIT (1024 * 1024)
+
+LOCAL(int)
+check_cpuinfo (char *buffer, const char *field, char *value)
+{
+  char *p;
+  if (*value == 0)
+    return 0;
+  if (strncmp(buffer, field, strlen(field)) != 0)
+    return 0;
+  buffer += strlen(field);
+  while (isspace(*buffer))
+    buffer++;
+
+  /* Check if 'value' is present in the buffer as a separate word */
+  while ((p = strstr(buffer, value))) {
+    if (p > buffer && !isspace(*(p - 1))) {
+      buffer++;
+      continue;
+    }
+    p += strlen(value);
+    if (*p != 0 && !isspace(*p)) {
+      buffer++;
+      continue;
+    }
+    return 1;
+  }
+  return 0;
+}
+
+LOCAL(int)
+parse_proc_cpuinfo (int bufsize)
+{
+  char *buffer = (char *)malloc(bufsize);
+  FILE *fd;
+
+  if (!buffer)
+    return 0;
+
+  fd = fopen("/proc/cpuinfo", "r");
+  if (fd) {
+    while (fgets(buffer, bufsize, fd)) {
+      if (!strchr(buffer, '\n') && !feof(fd)) {
+        /* "impossible" happened - insufficient size of the buffer! */
+        fclose(fd);
+        free(buffer);
+        return 0;
+      }
+      if (check_cpuinfo(buffer, "CPU part", "0xd03") ||
+          check_cpuinfo(buffer, "CPU part", "0xd07"))
+        /* The Cortex-A53 has a slow tbl implementation.  We can gain a few
+           percent speedup by disabling the use of that instruction.  The
+           speedup on Cortex-A57 is more subtle but still measurable. */
+        simd_features &= ~JSIMD_FASTTBL;
+      else if (check_cpuinfo(buffer, "CPU part", "0x0a1"))
+        /* The SIMD version of Huffman encoding is slower than the C version on
+           Cavium ThunderX.  Also, ld3 and st3 are abyssmally slow on that
+           CPU. */
+        simd_huffman = simd_features = 0;
+    }
+    fclose(fd);
+  }
+  free(buffer);
+  return 1;
+}
+
+#endif
 
 /*
  * Check what SIMD accelerations are supported.
@@ -33,16 +111,19 @@ static unsigned int simd_support = ~0;
  * FIXME: This code is racy under a multi-threaded environment.
  */
 
-/* 
+/*
  * ARMv8 architectures support NEON extensions by default.
  * It is no longer optional as it was with ARMv7.
- */ 
+ */
 
 
 LOCAL(void)
 init_simd (void)
 {
   char *env = NULL;
+#if defined(__linux__) || defined(ANDROID) || defined(__ANDROID__)
+  int bufsize = 1024; /* an initial guess for the line buffer size limit */
+#endif
 
   if (simd_support != ~0U)
     return;
@@ -50,6 +131,13 @@ init_simd (void)
   simd_support = 0;
 
   simd_support |= JSIMD_ARM_NEON;
+#if defined(__linux__) || defined(ANDROID) || defined(__ANDROID__)
+  while (!parse_proc_cpuinfo(bufsize)) {
+    bufsize *= 2;
+    if (bufsize > SOMEWHAT_SANE_PROC_CPUINFO_SIZE_LIMIT)
+      break;
+  }
+#endif
 
   /* Force different settings through environment variables */
   env = getenv("JSIMD_FORCENEON");
@@ -58,6 +146,19 @@ init_simd (void)
   env = getenv("JSIMD_FORCENONE");
   if ((env != NULL) && (strcmp(env, "1") == 0))
     simd_support = 0;
+  env = getenv("JSIMD_NOHUFFENC");
+  if ((env != NULL) && (strcmp(env, "1") == 0))
+    simd_huffman = 0;
+  env = getenv("JSIMD_FASTLD3");
+  if ((env != NULL) && (strcmp(env, "1") == 0))
+    simd_features |= JSIMD_FASTLD3;
+  if ((env != NULL) && (strcmp(env, "0") == 0))
+    simd_features &= ~JSIMD_FASTLD3;
+  env = getenv("JSIMD_FASTST3");
+  if ((env != NULL) && (strcmp(env, "1") == 0))
+    simd_features |= JSIMD_FASTST3;
+  if ((env != NULL) && (strcmp(env, "0") == 0))
+    simd_features &= ~JSIMD_FASTST3;
 }
 
 GLOBAL(int)
@@ -65,6 +166,17 @@ jsimd_can_rgb_ycc (void)
 {
   init_simd();
 
+  /* The code is optimised for these values only */
+  if (BITS_IN_JSAMPLE != 8)
+    return 0;
+  if (sizeof(JDIMENSION) != 4)
+    return 0;
+  if ((RGB_PIXELSIZE != 3) && (RGB_PIXELSIZE != 4))
+    return 0;
+
+  if (simd_support & JSIMD_ARM_NEON)
+    return 1;
+
   return 0;
 }
 
@@ -117,6 +229,46 @@ jsimd_rgb_ycc_convert (j_compress_ptr cinfo,
                        JSAMPARRAY input_buf, JSAMPIMAGE output_buf,
                        JDIMENSION output_row, int num_rows)
 {
+  void (*neonfct)(JDIMENSION, JSAMPARRAY, JSAMPIMAGE, JDIMENSION, int);
+
+  switch(cinfo->in_color_space) {
+    case JCS_EXT_RGB:
+      if (simd_features & JSIMD_FASTLD3)
+        neonfct=jsimd_extrgb_ycc_convert_neon;
+      else
+        neonfct=jsimd_extrgb_ycc_convert_neon_slowld3;
+      break;
+    case JCS_EXT_RGBX:
+    case JCS_EXT_RGBA:
+      neonfct=jsimd_extrgbx_ycc_convert_neon;
+      break;
+    case JCS_EXT_BGR:
+      if (simd_features & JSIMD_FASTLD3)
+        neonfct=jsimd_extbgr_ycc_convert_neon;
+      else
+        neonfct=jsimd_extbgr_ycc_convert_neon_slowld3;
+      break;
+    case JCS_EXT_BGRX:
+    case JCS_EXT_BGRA:
+      neonfct=jsimd_extbgrx_ycc_convert_neon;
+      break;
+    case JCS_EXT_XBGR:
+    case JCS_EXT_ABGR:
+      neonfct=jsimd_extxbgr_ycc_convert_neon;
+      break;
+    case JCS_EXT_XRGB:
+    case JCS_EXT_ARGB:
+      neonfct=jsimd_extxrgb_ycc_convert_neon;
+      break;
+    default:
+      if (simd_features & JSIMD_FASTLD3)
+        neonfct=jsimd_extrgb_ycc_convert_neon;
+      else
+        neonfct=jsimd_extrgb_ycc_convert_neon_slowld3;
+      break;
+  }
+
+  neonfct(cinfo->image_width, input_buf, output_buf, output_row, num_rows);
 }
 
 GLOBAL(void)
@@ -135,14 +287,20 @@ jsimd_ycc_rgb_convert (j_decompress_ptr cinfo,
 
   switch(cinfo->out_color_space) {
     case JCS_EXT_RGB:
-      neonfct=jsimd_ycc_extrgb_convert_neon;
+      if (simd_features & JSIMD_FASTST3)
+        neonfct=jsimd_ycc_extrgb_convert_neon;
+      else
+        neonfct=jsimd_ycc_extrgb_convert_neon_slowst3;
       break;
     case JCS_EXT_RGBX:
     case JCS_EXT_RGBA:
       neonfct=jsimd_ycc_extrgbx_convert_neon;
       break;
     case JCS_EXT_BGR:
-      neonfct=jsimd_ycc_extbgr_convert_neon;
+      if (simd_features & JSIMD_FASTST3)
+        neonfct=jsimd_ycc_extbgr_convert_neon;
+      else
+        neonfct=jsimd_ycc_extbgr_convert_neon_slowst3;
       break;
     case JCS_EXT_BGRX:
     case JCS_EXT_BGRA:
@@ -157,12 +315,14 @@ jsimd_ycc_rgb_convert (j_decompress_ptr cinfo,
       neonfct=jsimd_ycc_extxrgb_convert_neon;
       break;
     default:
-      neonfct=jsimd_ycc_extrgb_convert_neon;
+      if (simd_features & JSIMD_FASTST3)
+        neonfct=jsimd_ycc_extrgb_convert_neon;
+      else
+        neonfct=jsimd_ycc_extrgb_convert_neon_slowst3;
       break;
   }
 
-  if (simd_support & JSIMD_ARM_NEON)
-    neonfct(cinfo->output_width, input_buf, input_row, output_buf, num_rows);
+  neonfct(cinfo->output_width, input_buf, input_row, output_buf, num_rows);
 }
 
 GLOBAL(void)
@@ -170,9 +330,8 @@ jsimd_ycc_rgb565_convert (j_decompress_ptr cinfo,
                           JSAMPIMAGE input_buf, JDIMENSION input_row,
                           JSAMPARRAY output_buf, int num_rows)
 {
-  if (simd_support & JSIMD_ARM_NEON)
-    jsimd_ycc_rgb565_convert_neon(cinfo->output_width, input_buf, input_row,
-                                  output_buf, num_rows);
+  jsimd_ycc_rgb565_convert_neon(cinfo->output_width, input_buf, input_row,
+                                output_buf, num_rows);
 }
 
 GLOBAL(int)
@@ -180,6 +339,17 @@ jsimd_can_h2v2_downsample (void)
 {
   init_simd();
 
+  /* The code is optimised for these values only */
+  if (BITS_IN_JSAMPLE != 8)
+    return 0;
+  if (DCTSIZE != 8)
+    return 0;
+  if (sizeof(JDIMENSION) != 4)
+    return 0;
+
+  if (simd_support & JSIMD_ARM_NEON)
+    return 1;
+
   return 0;
 }
 
@@ -188,19 +358,36 @@ jsimd_can_h2v1_downsample (void)
 {
   init_simd();
 
+  /* The code is optimised for these values only */
+  if (BITS_IN_JSAMPLE != 8)
+    return 0;
+  if (DCTSIZE != 8)
+    return 0;
+  if (sizeof(JDIMENSION) != 4)
+    return 0;
+
+  if (simd_support & JSIMD_ARM_NEON)
+    return 1;
+
   return 0;
 }
 
 GLOBAL(void)
-jsimd_h2v2_downsample (j_compress_ptr cinfo, jpeg_component_info * compptr,
+jsimd_h2v2_downsample (j_compress_ptr cinfo, jpeg_component_info *compptr,
                        JSAMPARRAY input_data, JSAMPARRAY output_data)
 {
+  jsimd_h2v2_downsample_neon(cinfo->image_width, cinfo->max_v_samp_factor,
+                             compptr->v_samp_factor, compptr->width_in_blocks,
+                             input_data, output_data);
 }
 
 GLOBAL(void)
-jsimd_h2v1_downsample (j_compress_ptr cinfo, jpeg_component_info * compptr,
+jsimd_h2v1_downsample (j_compress_ptr cinfo, jpeg_component_info *compptr,
                        JSAMPARRAY input_data, JSAMPARRAY output_data)
 {
+  jsimd_h2v1_downsample_neon(cinfo->image_width, cinfo->max_v_samp_factor,
+                             compptr->v_samp_factor, compptr->width_in_blocks,
+                             input_data, output_data);
 }
 
 GLOBAL(int)
@@ -221,17 +408,17 @@ jsimd_can_h2v1_upsample (void)
 
 GLOBAL(void)
 jsimd_h2v2_upsample (j_decompress_ptr cinfo,
-                     jpeg_component_info * compptr,
+                     jpeg_component_info *compptr,
                      JSAMPARRAY input_data,
-                     JSAMPARRAY * output_data_ptr)
+                     JSAMPARRAY *output_data_ptr)
 {
 }
 
 GLOBAL(void)
 jsimd_h2v1_upsample (j_decompress_ptr cinfo,
-                     jpeg_component_info * compptr,
+                     jpeg_component_info *compptr,
                      JSAMPARRAY input_data,
-                     JSAMPARRAY * output_data_ptr)
+                     JSAMPARRAY *output_data_ptr)
 {
 }
 
@@ -253,17 +440,17 @@ jsimd_can_h2v1_fancy_upsample (void)
 
 GLOBAL(void)
 jsimd_h2v2_fancy_upsample (j_decompress_ptr cinfo,
-                           jpeg_component_info * compptr,
+                           jpeg_component_info *compptr,
                            JSAMPARRAY input_data,
-                           JSAMPARRAY * output_data_ptr)
+                           JSAMPARRAY *output_data_ptr)
 {
 }
 
 GLOBAL(void)
 jsimd_h2v1_fancy_upsample (j_decompress_ptr cinfo,
-                           jpeg_component_info * compptr,
+                           jpeg_component_info *compptr,
                            JSAMPARRAY input_data,
-                           JSAMPARRAY * output_data_ptr)
+                           JSAMPARRAY *output_data_ptr)
 {
 }
 
@@ -304,6 +491,19 @@ jsimd_can_convsamp (void)
 {
   init_simd();
 
+  /* The code is optimised for these values only */
+  if (DCTSIZE != 8)
+    return 0;
+  if (BITS_IN_JSAMPLE != 8)
+    return 0;
+  if (sizeof(JDIMENSION) != 4)
+    return 0;
+  if (sizeof(DCTELEM) != 2)
+    return 0;
+
+  if (simd_support & JSIMD_ARM_NEON)
+    return 1;
+
   return 0;
 }
 
@@ -317,13 +517,14 @@ jsimd_can_convsamp_float (void)
 
 GLOBAL(void)
 jsimd_convsamp (JSAMPARRAY sample_data, JDIMENSION start_col,
-                DCTELEM * workspace)
+                DCTELEM *workspace)
 {
+  jsimd_convsamp_neon(sample_data, start_col, workspace);
 }
 
 GLOBAL(void)
 jsimd_convsamp_float (JSAMPARRAY sample_data, JDIMENSION start_col,
-                      FAST_FLOAT * workspace)
+                      FAST_FLOAT *workspace)
 {
 }
 
@@ -332,6 +533,15 @@ jsimd_can_fdct_islow (void)
 {
   init_simd();
 
+  /* The code is optimised for these values only */
+  if (DCTSIZE != 8)
+    return 0;
+  if (sizeof(DCTELEM) != 2)
+    return 0;
+
+  if (simd_support & JSIMD_ARM_NEON)
+    return 1;
+
   return 0;
 }
 
@@ -340,6 +550,15 @@ jsimd_can_fdct_ifast (void)
 {
   init_simd();
 
+  /* The code is optimised for these values only */
+  if (DCTSIZE != 8)
+    return 0;
+  if (sizeof(DCTELEM) != 2)
+    return 0;
+
+  if (simd_support & JSIMD_ARM_NEON)
+    return 1;
+
   return 0;
 }
 
@@ -352,17 +571,19 @@ jsimd_can_fdct_float (void)
 }
 
 GLOBAL(void)
-jsimd_fdct_islow (DCTELEM * data)
+jsimd_fdct_islow (DCTELEM *data)
 {
+  jsimd_fdct_islow_neon(data);
 }
 
 GLOBAL(void)
-jsimd_fdct_ifast (DCTELEM * data)
+jsimd_fdct_ifast (DCTELEM *data)
 {
+  jsimd_fdct_ifast_neon(data);
 }
 
 GLOBAL(void)
-jsimd_fdct_float (FAST_FLOAT * data)
+jsimd_fdct_float (FAST_FLOAT *data)
 {
 }
 
@@ -371,6 +592,17 @@ jsimd_can_quantize (void)
 {
   init_simd();
 
+  /* The code is optimised for these values only */
+  if (DCTSIZE != 8)
+    return 0;
+  if (sizeof(JCOEF) != 2)
+    return 0;
+  if (sizeof(DCTELEM) != 2)
+    return 0;
+
+  if (simd_support & JSIMD_ARM_NEON)
+    return 1;
+
   return 0;
 }
 
@@ -383,14 +615,15 @@ jsimd_can_quantize_float (void)
 }
 
 GLOBAL(void)
-jsimd_quantize (JCOEFPTR coef_block, DCTELEM * divisors,
-                DCTELEM * workspace)
+jsimd_quantize (JCOEFPTR coef_block, DCTELEM *divisors,
+                DCTELEM *workspace)
 {
+  jsimd_quantize_neon(coef_block, divisors, workspace);
 }
 
 GLOBAL(void)
-jsimd_quantize_float (JCOEFPTR coef_block, FAST_FLOAT * divisors,
-                      FAST_FLOAT * workspace)
+jsimd_quantize_float (JCOEFPTR coef_block, FAST_FLOAT *divisors,
+                      FAST_FLOAT *workspace)
 {
 }
 
@@ -441,23 +674,21 @@ jsimd_can_idct_4x4 (void)
 }
 
 GLOBAL(void)
-jsimd_idct_2x2 (j_decompress_ptr cinfo, jpeg_component_info * compptr,
+jsimd_idct_2x2 (j_decompress_ptr cinfo, jpeg_component_info *compptr,
                 JCOEFPTR coef_block, JSAMPARRAY output_buf,
                 JDIMENSION output_col)
 {
-  if (simd_support & JSIMD_ARM_NEON)
-    jsimd_idct_2x2_neon(compptr->dct_table, coef_block, output_buf,
-                        output_col);
+  jsimd_idct_2x2_neon(compptr->dct_table, coef_block, output_buf,
+                      output_col);
 }
 
 GLOBAL(void)
-jsimd_idct_4x4 (j_decompress_ptr cinfo, jpeg_component_info * compptr,
+jsimd_idct_4x4 (j_decompress_ptr cinfo, jpeg_component_info *compptr,
                 JCOEFPTR coef_block, JSAMPARRAY output_buf,
                 JDIMENSION output_col)
 {
-  if (simd_support & JSIMD_ARM_NEON)
-    jsimd_idct_4x4_neon(compptr->dct_table, coef_block, output_buf,
-                        output_col);
+  jsimd_idct_4x4_neon(compptr->dct_table, coef_block, output_buf,
+                      output_col);
 }
 
 GLOBAL(int)
@@ -517,28 +748,55 @@ jsimd_can_idct_float (void)
 }
 
 GLOBAL(void)
-jsimd_idct_islow (j_decompress_ptr cinfo, jpeg_component_info * compptr,
+jsimd_idct_islow (j_decompress_ptr cinfo, jpeg_component_info *compptr,
                   JCOEFPTR coef_block, JSAMPARRAY output_buf,
                   JDIMENSION output_col)
 {
-  if (simd_support & JSIMD_ARM_NEON)
-    jsimd_idct_islow_neon(compptr->dct_table, coef_block, output_buf,
-                          output_col);
+  jsimd_idct_islow_neon(compptr->dct_table, coef_block, output_buf,
+                        output_col);
 }
 
 GLOBAL(void)
-jsimd_idct_ifast (j_decompress_ptr cinfo, jpeg_component_info * compptr,
+jsimd_idct_ifast (j_decompress_ptr cinfo, jpeg_component_info *compptr,
                   JCOEFPTR coef_block, JSAMPARRAY output_buf,
                   JDIMENSION output_col)
 {
-  if (simd_support & JSIMD_ARM_NEON)
-    jsimd_idct_ifast_neon(compptr->dct_table, coef_block, output_buf,
-                          output_col);
+  jsimd_idct_ifast_neon(compptr->dct_table, coef_block, output_buf,
+                        output_col);
 }
 
 GLOBAL(void)
-jsimd_idct_float (j_decompress_ptr cinfo, jpeg_component_info * compptr,
+jsimd_idct_float (j_decompress_ptr cinfo, jpeg_component_info *compptr,
                   JCOEFPTR coef_block, JSAMPARRAY output_buf,
                   JDIMENSION output_col)
 {
 }
+
+GLOBAL(int)
+jsimd_can_huff_encode_one_block (void)
+{
+  init_simd();
+
+  if (DCTSIZE != 8)
+    return 0;
+  if (sizeof(JCOEF) != 2)
+    return 0;
+
+  if (simd_support & JSIMD_ARM_NEON && simd_huffman)
+    return 1;
+
+  return 0;
+}
+
+GLOBAL(JOCTET*)
+jsimd_huff_encode_one_block (void *state, JOCTET *buffer, JCOEFPTR block,
+                             int last_dc_val, c_derived_tbl *dctbl,
+                             c_derived_tbl *actbl)
+{
+  if (simd_features & JSIMD_FASTTBL)
+    return jsimd_huff_encode_one_block_neon(state, buffer, block, last_dc_val,
+                                            dctbl, actbl);
+  else
+    return jsimd_huff_encode_one_block_neon_slowtbl(state, buffer, block,
+                                                    last_dc_val, dctbl, actbl);
+}