Thank you to anyone who has already donated - your generous donations helped make three months of treatment possible.
My brother Nate continues to fight stage IV Hodgkin's lymphoma. He's just 31, with a wife and baby girl. They have no active income (since he's been unable to return to work), no insurance, and cannot afford the treatment he needs. Nate and his family need your help. Please consider a donation, every dollar helps. Thanks.
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diff --git a/apps/plugins/CATEGORIES b/apps/plugins/CATEGORIES index 09a4476..4d4418e 100644 @@ -93,6 +93,7 @@ test_scanrate,apps test_touchscreen,apps test_viewports,apps test_greylib_bitmap_scale,viewers +test_clz_speed,apps text_editor,apps vbrfix,viewers video,viewers diff --git a/apps/plugins/SOURCES b/apps/plugins/SOURCES index 6257a22..e8f1f8d 100644 @@ -28,6 +28,7 @@ firmware_flash.c #if (CONFIG_CPU == SH7034) rockbox_flash.c #endif /* CONFIG_CPU */ +test_clz_speed.c #ifndef OLYMPUS_MROBE_500 diff --git a/apps/plugins/test_clz_speed.c b/apps/plugins/test_clz_speed.c new file mode 100644 index 0000000..3d9a530 +/***************************************************************************** + * __________ __ ___. + * Open \______ \ ____ ____ | | _\_ |__ _______ ___ + * Source | _// __ \_/ ___\| |/ /| __ \ / __ \ \/ / + * Jukebox | | ( (__) ) \___| ( | \_\ ( (__) ) ( + * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ + * \/ \/ \/ \/ \/ + * $Id$ + * + * Copyright (C) 2008 Andrew Mahone + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY + * KIND, either express or implied. + * + ****************************************************************************/ + +#include "plugin.h" +#include "lib/pluginlib_actions.h" + +PLUGIN_HEADER + +static const char clz_lut1[16] = { 4, 3, 2, 2, 1, 1, 1, 1, + 0, 0, 0, 0, 0, 0, 0, 0 }; +/* This clz is based on the log2(n) implementation at + * http://graphics.stanford.edu/~seander/bithacks.html#IntegerLogLookup + */ +int clz1(uint32_t v) +{ + int r = 28; + if (v >= 0x10000) + { + v >>= 16; + r -= 16; + } + if (v & 0xff00) + { + v >>= 8; + r -= 8; + } + if (v & 0xf0) + { + v >>= 4; + r -= 4; + } + return r + clz_lut1[v]; +} + +static const char clz_lut2[256] = { + 8, 7, 6, 6, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, + 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, + 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, + 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, + 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, + 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, + 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, + 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 +}; +int clz2(uint32_t v) +{ + int r = 24; + if (v >= 0x10000) + { + v >>= 16; + r -= 16; + } + if (v & 0xff00) + { + v >>= 8; + r -= 8; + } + return r + clz_lut2[v]; +} + +static const char clz_lut3[53] = { + 32, 31, 30, 25, 29, 6, 24, 0, 28, 0, 19, 5, 23, 12, 0, 0, 27, 8, 0, + 14, 16, 18, 4, 0, 2, 22, 11, 0, 0, 0, 0, 0, 0, 26, 7, 0, 0, 20, + 13, 0, 9, 15, 17, 0, 3, 0, 0, 0,1, 0, 21, 0, 10 +}; +int clz3(uint32_t v) +{ + v |= v >> 16; + v |= v >> 8; + v |= v >> 4; + v |= v >> 2; + v |= v >> 1; + v ^= v >> 1; + return clz_lut3[(v * 70428299UL)>>26]; +} + +int clz4(uint32_t v) +{ + int r = 32; + if (v >= 0x10000) + { + v >>= 16; + r -= 16; + } + if (v & 0xff00) + { + v >>= 8; + r -= 8; + } + if (v & 0xf0) + { + v >>= 4; + r -= 4; + } + if (v & 0xc) + { + v >>= 2; + r -= 2; + } + if (v & 2) + { + v >>= 1; + r -= 1; + } + r -= v; + return r; +} + +int (*func_table[])(uint32_t) = +{ + clz1, + clz2, + clz3, + clz4, + NULL, +}; + +const struct button_mapping *plugin_contexts[] = {generic_actions}; + +/* this is the plugin entry point */ +enum plugin_status plugin_start(const void* parameter) +{ + (void) parameter; + int y = 0, w=0, h=0, n; + char buf[16]; + h = rb->lcd_getstringsize("0", &w, &h); + rb->lcd_set_drawmode(DRMODE_FG); + for (n = 0 ; func_table[n]; n++) + { + long t1 = *(rb->current_tick); + uint32_t i, lz; + for(i = 0; i < 1UL<<31; i+= 1023) + lz = (*(func_table[n]))(i); + long t2 = *(rb->current_tick); + rb->snprintf(buf, sizeof(buf), "%d:%d", n, (int)(t2-t1)); + rb->lcd_putsxy(0, y, buf); + rb->lcd_update(); + y += h * 2; + } + while(1) + { + int button = pluginlib_getaction(1, plugin_contexts, 1); + if (button == PLA_QUIT) + return PLUGIN_OK; + rb->yield(); + } +} |
