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author | Michael Sevakis <jethead71@rockbox.org> | 2010-05-11 10:22:23 +0000 |
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committer | Michael Sevakis <jethead71@rockbox.org> | 2010-05-11 10:22:23 +0000 |
commit | 81bfa137b64efd742415eba8e00ae5530e551742 (patch) | |
tree | 69bdc636dd4c95a892b0713978fd5af10f46841b /apps/dsp_arm.S | |
parent | 51845b344b90c19c05cb8e49e8a5be1910884c9a (diff) | |
download | rockbox-81bfa137b64efd742415eba8e00ae5530e551742.tar.gz rockbox-81bfa137b64efd742415eba8e00ae5530e551742.zip |
ARM DSP: Get an instruction out of the crossfeed main loop and improve loads and interlocks for stacked vars.
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@25946 a1c6a512-1295-4272-9138-f99709370657
Diffstat (limited to 'apps/dsp_arm.S')
-rw-r--r-- | apps/dsp_arm.S | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/apps/dsp_arm.S b/apps/dsp_arm.S index d9e05bf248..2a5647d759 100644 --- a/apps/dsp_arm.S +++ b/apps/dsp_arm.S | |||
@@ -274,8 +274,9 @@ apply_crossfeed: | |||
274 | 274 | ||
275 | ldr r1, =crossfeed_data | 275 | ldr r1, =crossfeed_data |
276 | ldmia r1!, { r4-r11 } @ load direct gain and filter data | 276 | ldmia r1!, { r4-r11 } @ load direct gain and filter data |
277 | add r12, r1, #13*4*2 @ calculate end of delay | 277 | mov r12, r0 @ better to ldm delay + count later |
278 | stmdb sp!, { r0, r12 } @ stack count and end of delay adr | 278 | add r0, r1, #13*4*2 @ calculate end of delay |
279 | stmdb sp!, { r0, r12 } @ stack end of delay adr and count | ||
279 | ldr r0, [r1, #13*4*2] @ fetch current delay line address | 280 | ldr r0, [r1, #13*4*2] @ fetch current delay line address |
280 | 281 | ||
281 | /* Register usage in loop: | 282 | /* Register usage in loop: |
@@ -304,15 +305,14 @@ apply_crossfeed: | |||
304 | smlal r14, r1, r4, r12 @ acc += gain*x_r[n] | 305 | smlal r14, r1, r4, r12 @ acc += gain*x_r[n] |
305 | str r12, [r0], #4 @ save right input to delay line | 306 | str r12, [r0], #4 @ save right input to delay line |
306 | mov r1, r1, lsl #1 @ fix format | 307 | mov r1, r1, lsl #1 @ fix format |
308 | ldmia sp, { r12, r14 } @ fetch delay line end addr and count from stack | ||
307 | str r1, [r3], #4 @ save result | 309 | str r1, [r3], #4 @ save result |
308 | 310 | ||
309 | ldr r12, [sp, #4] @ fetch delay line end addr from stack | ||
310 | cmp r0, r12 @ need to wrap to start of delay? | 311 | cmp r0, r12 @ need to wrap to start of delay? |
311 | subeq r0, r0, #13*4*2 @ wrap back delay line ptr to start | 312 | subeq r0, r0, #13*4*2 @ wrap back delay line ptr to start |
312 | 313 | ||
313 | ldr r1, [sp] @ fetch count from stack | 314 | subs r14, r14, #1 @ are we finished? |
314 | subs r1, r1, #1 @ are we finished? | 315 | strne r14, [sp, #4] @ nope, save count back to stack |
315 | strne r1, [sp] @ nope, save count back to stack | ||
316 | bne .cfloop | 316 | bne .cfloop |
317 | 317 | ||
318 | @ save data back to struct | 318 | @ save data back to struct |