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author | Marcin Bukat <marcin.bukat@gmail.com> | 2010-06-15 10:41:43 +0000 |
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committer | Marcin Bukat <marcin.bukat@gmail.com> | 2010-06-15 10:41:43 +0000 |
commit | a316ebe65b3efea6863bb4098ef28c9bea1d7717 (patch) | |
tree | 7dcb8a49808a435d8f731b58b5910db48babd559 | |
parent | 518d3fcc77bc21c0ff89f1dcb93c02eb51305ecc (diff) | |
download | rockbox-a316ebe65b3efea6863bb4098ef28c9bea1d7717.tar.gz rockbox-a316ebe65b3efea6863bb4098ef28c9bea1d7717.zip |
HD200 - use line transfers in lcd_grey_data. This gives ~25% speedup.
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@26856 a1c6a512-1295-4272-9138-f99709370657
-rw-r--r-- | firmware/target/coldfire/mpio/hd200/lcd-as-hd200.S | 84 |
1 files changed, 77 insertions, 7 deletions
diff --git a/firmware/target/coldfire/mpio/hd200/lcd-as-hd200.S b/firmware/target/coldfire/mpio/hd200/lcd-as-hd200.S index 9709e210e2..a284896af7 100644 --- a/firmware/target/coldfire/mpio/hd200/lcd-as-hd200.S +++ b/firmware/target/coldfire/mpio/hd200/lcd-as-hd200.S | |||
@@ -125,16 +125,26 @@ lcd_mono_data: | |||
125 | .type lcd_grey_data,@function | 125 | .type lcd_grey_data,@function |
126 | 126 | ||
127 | lcd_grey_data: | 127 | lcd_grey_data: |
128 | lea.l (-6*4, %sp), %sp | 128 | lea.l (-8*4, %sp), %sp |
129 | movem.l %d2-%d5/%a2-%a3, (%sp) | 129 | movem.l %d2-%d7/%a2-%a3, (%sp) /* save some registers */ |
130 | movem.l (6*4+4, %sp), %a0-%a2 /* values, phases, length */ | 130 | movem.l (8*4+4, %sp), %a0-%a2 /* values, phases, length */ |
131 | add.l %a2, %a2 | 131 | add.l %a2, %a2 |
132 | lea.l (%a1, %a2.l*4), %a2 /* end address */ | 132 | lea.l (%a1, %a2.l*4), %a2 /* end address */ |
133 | lea.l LCD_BASE_ADDRESS+2, %a3 /* LCD data port address */ | 133 | lea.l LCD_BASE_ADDRESS+2, %a3 /* LCD data port address */ |
134 | moveq.l #24, %d4 /* shift count */ | 134 | moveq.l #24, %d4 /* shift count */ |
135 | move.l #0x204081, %d5 /* bit shuffle factor */ | 135 | move.l #0x204081, %d5 /* bit shuffle factor */ |
136 | 136 | ||
137 | .ph_loop: | 137 | moveq.l #12, %d2 |
138 | add.l %a1, %d2 | ||
139 | and.l #0xfffffff0, %d2 /* first line bound */ | ||
140 | cmp.l %d2, %a2 /* end address lower than first line bound? */ | ||
141 | bhs.s 1f | ||
142 | move.l %a2, %d2 /* -> adjust end address of head loop */ | ||
143 | 1: | ||
144 | cmp.l %a1, %d2 | ||
145 | bls.s .g_head_tail_end | ||
146 | |||
147 | .g_head_tail: | ||
138 | movem.l (%a1), %d0-%d1 /* fetch 8 pixel phases */ | 148 | movem.l (%a1), %d0-%d1 /* fetch 8 pixel phases */ |
139 | 149 | ||
140 | move.l %d0, %d2 | 150 | move.l %d0, %d2 |
@@ -159,11 +169,71 @@ lcd_grey_data: | |||
159 | addq.l #8, %a1 | 169 | addq.l #8, %a1 |
160 | 170 | ||
161 | move.w %d2, (%a3) /* transfer second LCD byte */ | 171 | move.w %d2, (%a3) /* transfer second LCD byte */ |
172 | |||
173 | .g_head_tail_end: | ||
174 | cmp.l %a1, %a2 | ||
175 | bls.w .g_end | ||
176 | lea.l (-8, %a2), %a2 | ||
177 | cmp.l %a1, %a2 | ||
178 | bls.s .g_line_end | ||
179 | |||
180 | .g_line_loop: | ||
181 | /* loop that utilize line transfers */ | ||
182 | movem.l (%a1), %d0-%d3 /* fetch 2 * 8 pixels phases */ | ||
183 | |||
184 | move.l %d0, %d6 | ||
185 | and.l #0x80808080, %d6 /* %d6 = 0.......1.......2.......3....... */ | ||
186 | eor.l %d6, %d0 | ||
187 | add.l (%a0)+, %d0 /* add values to first 4 phases */ | ||
188 | |||
189 | move.l %d1, %d7 | ||
190 | and.l #0x80808080, %d7 /* %d7 = 4.......5.......6.......7....... */ | ||
191 | eor.l %d7, %d1 | ||
192 | add.l (%a0)+, %d1 /* add values to second 4 phases */ | ||
193 | |||
194 | lsr.l #4, %d7 /* %d7 = ....4.......5.......6.......7... */ | ||
195 | or.l %d7, %d6 /* %d6 = 0...4...1...5...2...6...3...7... */ | ||
196 | mulu.l %d5, %d6 /* %d6 = 01234567123.567.23..67..3...7... */ | ||
197 | not.l %d6 /* negate bits */ | ||
198 | lsr.l %d4, %d6 /* %d6 = ........................01234567 */ | ||
199 | |||
200 | move.w %d6, (%a3) /* transfer first LCD byte */ | ||
201 | move.w %d6, (%a3) /* transfer second LCD byte */ | ||
202 | |||
203 | move.l %d2, %d6 | ||
204 | and.l #0x80808080, %d6 /* %d6 = 0.......1.......2.......3....... */ | ||
205 | eor.l %d6, %d2 | ||
206 | add.l (%a0)+, %d2 /* add values to first 4 phases */ | ||
207 | |||
208 | move.l %d3, %d7 | ||
209 | and.l #0x80808080, %d7 /* %d7 = 4.......5.......6.......7....... */ | ||
210 | eor.l %d7, %d3 | ||
211 | add.l (%a0)+, %d3 /* add values to second 4 phases */ | ||
212 | |||
213 | lsr.l #4, %d7 /* %d7 = ....4.......5.......6.......7... */ | ||
214 | or.l %d7, %d6 /* %d6 = 0...4...1...5...2...6...3...7... */ | ||
215 | mulu.l %d5, %d6 /* %d6 = 01234567123.567.23..67..3...7... */ | ||
216 | not.l %d6 /* negate bits */ | ||
217 | lsr.l %d4, %d6 /* %d6 = ........................01234567 */ | ||
218 | |||
219 | move.w %d6, (%a3) /* transfer first LCD byte */ | ||
220 | move.w %d6, (%a3) /* transfer second LCD byte */ | ||
221 | |||
222 | movem.l %d0-%d3, (%a1) /* store 2 * 8 new pixel phases */ | ||
223 | lea.l (16, %a1), %a1 /* advance pointer */ | ||
224 | |||
162 | cmp.l %a2, %a1 | 225 | cmp.l %a2, %a1 |
163 | bls.s .ph_loop | 226 | bls.s .g_line_loop |
227 | |||
228 | .g_line_end: | ||
229 | lea.l (8, %a2), %a2 | ||
230 | cmp.l %a1, %a2 | ||
231 | bls.s .g_end | ||
232 | bra.w .g_head_tail | ||
164 | 233 | ||
165 | movem.l (%sp), %d2-%d5/%a2-%a3 | 234 | .g_end: |
166 | lea.l (6*4, %sp), %sp | 235 | movem.l (%sp), %d2-%d7/%a2-%a3 |
236 | lea.l (8*4, %sp), %sp | ||
167 | rts | 237 | rts |
168 | .grey_end: | 238 | .grey_end: |
169 | .size lcd_grey_data,.grey_end-lcd_grey_data | 239 | .size lcd_grey_data,.grey_end-lcd_grey_data |