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authorJens Arnold <amiconn@rockbox.org>2009-07-11 23:43:44 +0000
committerJens Arnold <amiconn@rockbox.org>2009-07-11 23:43:44 +0000
commit47d4c4739bafcb9864dc8d1c2b44903ad4f75b68 (patch)
tree7a9f510c72a0df2ddacb0f6ec393658cf676b8d4 /firmware/target/arm/samsung/yh820
parentfa59ed6ae724b3f75c8ba35efcf7ce18f21e3ed2 (diff)
downloadrockbox-47d4c4739bafcb9864dc8d1c2b44903ad4f75b68.tar.gz
rockbox-47d4c4739bafcb9864dc8d1c2b44903ad4f75b68.zip
ARM asm LCD and ATA driver functions: Don't save r12 as it is a scratch reg. Saves a bit of stack and execution time.
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@21795 a1c6a512-1295-4272-9138-f99709370657
Diffstat (limited to 'firmware/target/arm/samsung/yh820')
-rw-r--r--firmware/target/arm/samsung/yh820/lcd-as-yh820.S79
1 files changed, 39 insertions, 40 deletions
diff --git a/firmware/target/arm/samsung/yh820/lcd-as-yh820.S b/firmware/target/arm/samsung/yh820/lcd-as-yh820.S
index e466624d04..7187b83661 100644
--- a/firmware/target/arm/samsung/yh820/lcd-as-yh820.S
+++ b/firmware/target/arm/samsung/yh820/lcd-as-yh820.S
@@ -48,7 +48,7 @@ lcd_write_yuv420_lines:
48 @ r0 = yuv_src 48 @ r0 = yuv_src
49 @ r1 = width 49 @ r1 = width
50 @ r2 = stride 50 @ r2 = stride
51 stmfd sp!, { r4-r12 } @ save non-scratch 51 stmfd sp!, { r4-r10, lr } @ save non-scratch
52 ldmia r0, { r4, r5, r6 } @ r4 = yuv_src[0] = Y'_p 52 ldmia r0, { r4, r5, r6 } @ r4 = yuv_src[0] = Y'_p
53 @ r5 = yuv_src[1] = Cb_p 53 @ r5 = yuv_src[1] = Cb_p
54 @ r6 = yuv_src[2] = Cr_p 54 @ r6 = yuv_src[2] = Cr_p
@@ -73,9 +73,9 @@ lcd_write_yuv420_lines:
73 add r10, r10, r8, asl #3 @ 73 add r10, r10, r8, asl #3 @
74 add r10, r10, r8, asl #4 @ 74 add r10, r10, r8, asl #4 @
75 @ 75 @
76 add r11, r9, r9, asl #2 @ r9 = Cr*101 76 add lr, r9, r9, asl #2 @ r9 = Cr*101
77 add r11, r11, r9, asl #5 @ 77 add lr, lr, r9, asl #5 @
78 add r9, r11, r9, asl #6 @ 78 add r9, lr, r9, asl #6 @
79 @ 79 @
80 add r8, r8, #2 @ r8 = bu = (Cb*128 + 128) >> 8 80 add r8, r8, #2 @ r8 = bu = (Cb*128 + 128) >> 8
81 mov r8, r8, asr #2 @ 81 mov r8, r8, asr #2 @
@@ -85,19 +85,19 @@ lcd_write_yuv420_lines:
85 mov r10, r10, asr #8 @ 85 mov r10, r10, asr #8 @
86 @ compute R, G, and B 86 @ compute R, G, and B
87 add r0, r8, r7, asr #8 @ r0 = b = (Y >> 9) + bu 87 add r0, r8, r7, asr #8 @ r0 = b = (Y >> 9) + bu
88 add r11, r9, r7, asr #8 @ r11 = r = (Y >> 9) + rv 88 add lr, r9, r7, asr #8 @ lr = r = (Y >> 9) + rv
89 add r7, r10, r7, asr #7 @ r7 = g = (Y >> 8) + guv 89 add r7, r10, r7, asr #7 @ r7 = g = (Y >> 8) + guv
90 @ 90 @
91 orr r12, r0, r11 @ check if clamping is needed... 91 orr r12, r0, lr @ check if clamping is needed...
92 orr r12, r12, r7, asr #1 @ ...at all 92 orr r12, r12, r7, asr #1 @ ...at all
93 cmp r12, #31 @ 93 cmp r12, #31 @
94 bls 15f @ no clamp @ 94 bls 15f @ no clamp @
95 cmp r0, #31 @ clamp b 95 cmp r0, #31 @ clamp b
96 mvnhi r0, r0, asr #31 @ 96 mvnhi r0, r0, asr #31 @
97 andhi r0, r0, #31 @ 97 andhi r0, r0, #31 @
98 cmp r11, #31 @ clamp r 98 cmp lr, #31 @ clamp r
99 mvnhi r11, r11, asr #31 @ 99 mvnhi lr, lr, asr #31 @
100 andhi r11, r11, #31 @ 100 andhi lr, lr, #31 @
101 cmp r7, #63 @ clamp g 101 cmp r7, #63 @ clamp g
102 mvnhi r7, r7, asr #31 @ 102 mvnhi r7, r7, asr #31 @
103 andhi r7, r7, #63 @ 103 andhi r7, r7, #63 @
@@ -105,14 +105,14 @@ lcd_write_yuv420_lines:
105 @ 105 @
106 ldrb r12, [r4, r2] @ r12 = Y' = *(Y'_p + stride) 106 ldrb r12, [r4, r2] @ r12 = Y' = *(Y'_p + stride)
107 @ 107 @
108 mov r11, r11, lsl #3 @ 108 mov lr, lr, lsl #3 @
109 orr r11, r11, r7, lsr #3 @ r11 = (r << 3) | (g >> 3) 109 orr lr, lr, r7, lsr #3 @ lr = (r << 3) | (g >> 3)
110 orr r0, r0, r7, lsl #5 @ r0 = (g << 5) | b 110 orr r0, r0, r7, lsl #5 @ r0 = (g << 5) | b
1111: @ busy @ 1111: @ busy @
112 ldr r7, [r3] @ r7 = LCD1_BASE 112 ldr r7, [r3] @ r7 = LCD1_BASE
113 tst r7, #LCD1_BUSY_MASK @ bridge busy? 113 tst r7, #LCD1_BUSY_MASK @ bridge busy?
114 bne 1b @ 114 bne 1b @
115 str r11, [r3, #0x10] @ send MSB 115 str lr, [r3, #0x10] @ send MSB
1161: @busy @ 1161: @busy @
117 ldr r7, [r3] @ r7 = LCD1_BASE 117 ldr r7, [r3] @ r7 = LCD1_BASE
118 tst r7, #LCD1_BUSY_MASK @ bridge busy? 118 tst r7, #LCD1_BUSY_MASK @ bridge busy?
@@ -124,19 +124,19 @@ lcd_write_yuv420_lines:
124 add r7, r12, r7, asl #5 @ 124 add r7, r12, r7, asl #5 @
125 @ compute R, G, and B 125 @ compute R, G, and B
126 add r0, r8, r7, asr #8 @ r0 = b = (Y >> 9) + bu 126 add r0, r8, r7, asr #8 @ r0 = b = (Y >> 9) + bu
127 add r11, r9, r7, asr #8 @ r11 = r = (Y >> 9) + rv 127 add lr, r9, r7, asr #8 @ lr = r = (Y >> 9) + rv
128 add r7, r10, r7, asr #7 @ r7 = g = (Y >> 8) + guv 128 add r7, r10, r7, asr #7 @ r7 = g = (Y >> 8) + guv
129 @ 129 @
130 orr r12, r0, r11 @ check if clamping is needed... 130 orr r12, r0, lr @ check if clamping is needed...
131 orr r12, r12, r7, asr #1 @ ...at all 131 orr r12, r12, r7, asr #1 @ ...at all
132 cmp r12, #31 @ 132 cmp r12, #31 @
133 bls 15f @ no clamp @ 133 bls 15f @ no clamp @
134 cmp r0, #31 @ clamp b 134 cmp r0, #31 @ clamp b
135 mvnhi r0, r0, asr #31 @ 135 mvnhi r0, r0, asr #31 @
136 andhi r0, r0, #31 @ 136 andhi r0, r0, #31 @
137 cmp r11, #31 @ clamp r 137 cmp lr, #31 @ clamp r
138 mvnhi r11, r11, asr #31 @ 138 mvnhi lr, lr, asr #31 @
139 andhi r11, r11, #31 @ 139 andhi lr, lr, #31 @
140 cmp r7, #63 @ clamp g 140 cmp r7, #63 @ clamp g
141 mvnhi r7, r7, asr #31 @ 141 mvnhi r7, r7, asr #31 @
142 andhi r7, r7, #63 @ 142 andhi r7, r7, #63 @
@@ -144,14 +144,14 @@ lcd_write_yuv420_lines:
144 @ 144 @
145 ldrb r12, [r4], #1 @ r12 = Y' = *(Y'_p++) 145 ldrb r12, [r4], #1 @ r12 = Y' = *(Y'_p++)
146 @ 146 @
147 mov r11, r11, lsl #3 @ 147 mov lr, lr, lsl #3 @
148 orr r11, r11, r7, lsr #3 @ r11 = (r << 3) | (g >> 3) 148 orr lr, lr, r7, lsr #3 @ lr = (r << 3) | (g >> 3)
149 orr r0, r0, r7, lsl #5 @ r0 = (g << 5) | b 149 orr r0, r0, r7, lsl #5 @ r0 = (g << 5) | b
1501: @ busy @ 1501: @ busy @
151 ldr r7, [r3] @ r7 = LCD1_BASE 151 ldr r7, [r3] @ r7 = LCD1_BASE
152 tst r7, #LCD1_BUSY_MASK @ bridge busy? 152 tst r7, #LCD1_BUSY_MASK @ bridge busy?
153 bne 1b @ 153 bne 1b @
154 str r11, [r3, #0x10] @ send MSB 154 str lr, [r3, #0x10] @ send MSB
1551: @ busy @ 1551: @ busy @
156 ldr r7, [r3] @ r7 = LCD1_BASE 156 ldr r7, [r3] @ r7 = LCD1_BASE
157 tst r7, #LCD1_BUSY_MASK @ bridge busy? 157 tst r7, #LCD1_BUSY_MASK @ bridge busy?
@@ -163,19 +163,19 @@ lcd_write_yuv420_lines:
163 add r7, r12, r7, asl #5 @ 163 add r7, r12, r7, asl #5 @
164 @ compute R, G, and B 164 @ compute R, G, and B
165 add r0, r8, r7, asr #8 @ r0 = b = (Y >> 9) + bu 165 add r0, r8, r7, asr #8 @ r0 = b = (Y >> 9) + bu
166 add r11, r9, r7, asr #8 @ r11 = r = (Y >> 9) + rv 166 add lr, r9, r7, asr #8 @ lr = r = (Y >> 9) + rv
167 add r7, r10, r7, asr #7 @ r7 = g = (Y >> 8) + guv 167 add r7, r10, r7, asr #7 @ r7 = g = (Y >> 8) + guv
168 @ 168 @
169 orr r12, r0, r11 @ check if clamping is needed... 169 orr r12, r0, lr @ check if clamping is needed...
170 orr r12, r12, r7, asr #1 @ ...at all 170 orr r12, r12, r7, asr #1 @ ...at all
171 cmp r12, #31 @ 171 cmp r12, #31 @
172 bls 15f @ no clamp @ 172 bls 15f @ no clamp @
173 cmp r0, #31 @ clamp b 173 cmp r0, #31 @ clamp b
174 mvnhi r0, r0, asr #31 @ 174 mvnhi r0, r0, asr #31 @
175 andhi r0, r0, #31 @ 175 andhi r0, r0, #31 @
176 cmp r11, #31 @ clamp r 176 cmp lr, #31 @ clamp r
177 mvnhi r11, r11, asr #31 @ 177 mvnhi lr, lr, asr #31 @
178 andhi r11, r11, #31 @ 178 andhi lr, lr, #31 @
179 cmp r7, #63 @ clamp g 179 cmp r7, #63 @ clamp g
180 mvnhi r7, r7, asr #31 @ 180 mvnhi r7, r7, asr #31 @
181 andhi r7, r7, #63 @ 181 andhi r7, r7, #63 @
@@ -184,14 +184,14 @@ lcd_write_yuv420_lines:
184 ldrb r12, [r4, r2] @ r12 = Y' = *(Y'_p + stride) 184 ldrb r12, [r4, r2] @ r12 = Y' = *(Y'_p + stride)
185 @ 185 @
186 @ 186 @
187 mov r11, r11, lsl #3 @ 187 mov lr, lr, lsl #3 @
188 orr r11, r11, r7, lsr #3 @ r11 = (r << 3) | (g >> 3) 188 orr lr, lr, r7, lsr #3 @ lr = (r << 3) | (g >> 3)
189 orr r0, r0, r7, lsl #5 @ r0 = (g << 5) | b 189 orr r0, r0, r7, lsl #5 @ r0 = (g << 5) | b
1901: @ busy @ 1901: @ busy @
191 ldr r7, [r3] @ r7 = LCD1_BASE 191 ldr r7, [r3] @ r7 = LCD1_BASE
192 tst r7, #LCD1_BUSY_MASK @ bridge busy? 192 tst r7, #LCD1_BUSY_MASK @ bridge busy?
193 bne 1b @ 193 bne 1b @
194 str r11, [r3, #0x10] @ send MSB 194 str lr, [r3, #0x10] @ send MSB
1951: @ busy @ 1951: @ busy @
196 ldr r7, [r3] @ r7 = LCD1_BASE 196 ldr r7, [r3] @ r7 = LCD1_BASE
197 tst r7, #LCD1_BUSY_MASK @ bridge busy? 197 tst r7, #LCD1_BUSY_MASK @ bridge busy?
@@ -203,32 +203,32 @@ lcd_write_yuv420_lines:
203 add r7, r12, r7, asl #5 @ 203 add r7, r12, r7, asl #5 @
204 @ compute R, G, and B 204 @ compute R, G, and B
205 add r0, r8, r7, asr #8 @ r0 = b = (Y >> 9) + bu 205 add r0, r8, r7, asr #8 @ r0 = b = (Y >> 9) + bu
206 add r11, r9, r7, asr #8 @ r11 = r = (Y >> 9) + rv 206 add lr, r9, r7, asr #8 @ lr = r = (Y >> 9) + rv
207 add r7, r10, r7, asr #7 @ r7 = g = (Y >> 8) + guv 207 add r7, r10, r7, asr #7 @ r7 = g = (Y >> 8) + guv
208 @ 208 @
209 orr r12, r0, r11 @ check if clamping is needed... 209 orr r12, r0, lr @ check if clamping is needed...
210 orr r12, r12, r7, asr #1 @ ...at all 210 orr r12, r12, r7, asr #1 @ ...at all
211 cmp r12, #31 @ 211 cmp r12, #31 @
212 bls 15f @ no clamp @ 212 bls 15f @ no clamp @
213 cmp r0, #31 @ clamp b 213 cmp r0, #31 @ clamp b
214 mvnhi r0, r0, asr #31 @ 214 mvnhi r0, r0, asr #31 @
215 andhi r0, r0, #31 @ 215 andhi r0, r0, #31 @
216 cmp r11, #31 @ clamp r 216 cmp lr, #31 @ clamp r
217 mvnhi r11, r11, asr #31 @ 217 mvnhi lr, lr, asr #31 @
218 andhi r11, r11, #31 @ 218 andhi lr, lr, #31 @
219 cmp r7, #63 @ clamp g 219 cmp r7, #63 @ clamp g
220 mvnhi r7, r7, asr #31 @ 220 mvnhi r7, r7, asr #31 @
221 andhi r7, r7, #63 @ 221 andhi r7, r7, #63 @
22215: @ no clamp @ 22215: @ no clamp @
223 @ 223 @
224 mov r11, r11, lsl #3 @ 224 mov lr, lr, lsl #3 @
225 orr r11, r11, r7, lsr #3 @ r11 = (r << 3) | (g >> 3) 225 orr lr, lr, r7, lsr #3 @ lr = (r << 3) | (g >> 3)
226 orr r0, r0, r7, lsl #5 @ r0 = (g << 5) | b 226 orr r0, r0, r7, lsl #5 @ r0 = (g << 5) | b
2271: @ busy @ 2271: @ busy @
228 ldr r7, [r3] @ r7 = LCD1_BASE 228 ldr r7, [r3] @ r7 = LCD1_BASE
229 tst r7, #LCD1_BUSY_MASK @ bridge busy? 229 tst r7, #LCD1_BUSY_MASK @ bridge busy?
230 bne 1b @ 230 bne 1b @
231 str r11, [r3, #0x10] @ send MSB 231 str lr, [r3, #0x10] @ send MSB
2321: @ busy @ 2321: @ busy @
233 ldr r7, [r3] @ r7 = LCD1_BASE 233 ldr r7, [r3] @ r7 = LCD1_BASE
234 tst r7, #LCD1_BUSY_MASK @ bridge busy? 234 tst r7, #LCD1_BUSY_MASK @ bridge busy?
@@ -238,8 +238,7 @@ lcd_write_yuv420_lines:
238 subs r1, r1, #2 @ subtract block from width 238 subs r1, r1, #2 @ subtract block from width
239 bgt 10b @ loop line @ 239 bgt 10b @ loop line @
240 @ 240 @
241 ldmfd sp!, { r4-r12 } @ restore registers and return 241 ldmfd sp!, { r4-r10, pc } @ restore registers and return
242 bx lr @
243 .ltorg @ dump constant pool 242 .ltorg @ dump constant pool
244 .size lcd_write_yuv420_lines, .-lcd_write_yuv420_lines 243 .size lcd_write_yuv420_lines, .-lcd_write_yuv420_lines
245 244
@@ -279,7 +278,7 @@ lcd_write_yuv420_lines_odither:
279 @ r2 = stride 278 @ r2 = stride
280 @ r3 = x_screen 279 @ r3 = x_screen
281 @ [sp] = y_screen 280 @ [sp] = y_screen
282 stmfd sp!, { r4-r12, lr } @ save non-scratch 281 stmfd sp!, { r4-r11, lr } @ save non-scratch
283 ldmia r0, { r4, r5, r6 } @ r4 = yuv_src[0] = Y'_p 282 ldmia r0, { r4, r5, r6 } @ r4 = yuv_src[0] = Y'_p
284 @ r5 = yuv_src[1] = Cb_p 283 @ r5 = yuv_src[1] = Cb_p
285 @ r6 = yuv_src[2] = Cr_p 284 @ r6 = yuv_src[2] = Cr_p
@@ -546,6 +545,6 @@ lcd_write_yuv420_lines_odither:
546 subs r1, r1, #2 @ subtract block from width 545 subs r1, r1, #2 @ subtract block from width
547 bgt 10b @ loop line @ 546 bgt 10b @ loop line @
548 @ 547 @
549 ldmfd sp!, { r4-r12, pc } @ restore registers and return 548 ldmfd sp!, { r4-r11, pc } @ restore registers and return
550 .ltorg @ dump constant pool 549 .ltorg @ dump constant pool
551 .size lcd_write_yuv420_lines_odither, .-lcd_write_yuv420_lines_odither 550 .size lcd_write_yuv420_lines_odither, .-lcd_write_yuv420_lines_odither
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-05 13:31:38 +0000