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Gigabeat S: Reduce stalling in the ARMv6 IDCT. Also save one instruction per loop, and fix comments. Speeds up fullscreen video decoding by about 5% (excluding video output). Still not perfect...

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@25775 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Jens Arnold 2010-05-02 12:13:26 +00:00
parent 9de9b9dfbe
commit f2759305a9
1 changed files with 54 additions and 52 deletions
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106
apps/plugins/mpegplayer/idct_armv6.S
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@ -39,42 +39,44 @@
ldrd r4, L_W1357 @ load W1, W3, W5, W7
smuad r6, r4, r10 @ b0 = W1 * f1 + W3 * f3
smlad r6, r5, r11, r6 @ + W5 * f5 + W7 * f7
smultt r7, r5, r10 @ b1 = -W7 * f3
smlabb r7, r4, r11, r7 @ + -W1 * f5
smlabt r7, r5, r11, r7 @ + -W5 * f7
rsb r7, r7, #0
smlatb r7, r4, r10, r7 @ + W3 * f1
smulbt r8, r4, r10 @ b2 = -W1 * f3
rsb r8, r8, #0
smlabb r8, r5, r10, r8 @ + W5 * f1
smlatb r8, r5, r11, r8 @ + W7 * f5
smlatt r8, r4, r11, r8 @ + W3 * f7
smultt r7, r5, r10 @ -b1 = W7 * f3
smulbt r8, r4, r10 @ -b2 = W1 * f3
smusdx r9, r10, r5 @ b3 = f1 * W7 - f3 * W5
smlsdx r9, r11, r4, r9 @ + f5 * W3 - f1 * W1
smlabb r7, r4, r11, r7 @ -b1 += W1 * f5
rsb r8, r8, #0 @ b2 = -b2
smlabb r8, r5, r10, r8 @ b2 += W5 * f1
smlad r6, r5, r11, r6 @ b0 += W5 * f5 + W7 * f7
smlabt r7, r5, r11, r7 @ -b1 += W5 * f7
smlatb r8, r5, r11, r8 @ b2 += W7 * f5
smlsdx r9, r11, r4, r9 @ b3 += f5 * W3 - f7 * W1
rsb r7, r7, #0 @ b1 = -b1
smlatb r7, r4, r10, r7 @ b1 += W3 * f1
smlatt r8, r4, r11, r8 @ b2 += W3 * f7
ldrd r4, L_W0246 @ load W0, W2, W4, W6
add r2, r2, #1 @ f0 += 1
smulbb r10, r4, r2 @ a0' = W0 * f0
smlabb r10, r5, r3, r10 @ + W4 * f4
smultt r12, r4, r2 @ a3' = W2 * f2
smlatt r12, r5, r3, r12 @ + W6 * f6
smulbb r10, r5, r3 @ a0' = W4 * f4
smultt r12, r5, r3 @ a3' = W6 * f6
smultt r3, r4, r3 @ -a2' = W2 * f6
rsb r11, r10, #0 @ a1' = -W4 * f4
smlabb r10, r4, r2, r10 @ a0' += W0 * f0
smlabb r11, r4, r2, r11 @ a1' += W0 * f0
smlatt r12, r4, r2, r12 @ a3' += W2 * f2
rsb r3, r3, #0 @ a2' = -a2'
smlatt r3, r5, r2, r3 @ a2' += W6 * f2
add r10, r10, r12 @ a0 = a0' + a3'
sub r12, r10, r12, lsl #1 @ a3 = a0 - 2 * a3'
smulbb r11, r5, r3 @ a1' = -W4 * f4
rsb r11, r11, #0
smlabb r11, r4, r2, r11 @ + W0 * f0
smultt r3, r4, r3 @ a2' = -W2 * f6
rsb r3, r3, #0
smlatt r3, r5, r2, r3 @ + W6 * f2
add r11, r11, r3 @ a1 = a1' + a2'
sub r3, r11, r3, lsl #1 @ a2 = a1 - 2 * a2'
subs r14, r14, #1 @ decrease loop count
@ Special store order for making the column pass calculate columns in
@ the order 0-2-1-3-4-6-5-7, allowing for uxtab16 use in later stages.
sub r2, r10, r6 @ block[7] = (a0 - b0)
@ -102,7 +104,6 @@
mov r2, r2, asr #12 @ >> 12
strh r2, [r1], #2 @ advance to next temp column
subs r14, r14, #1
bne .row_loop
b .col_start
@ -129,42 +130,44 @@ L_W0246:
ldrd r4, L_W1357 @ load W1, W3, W5, W7
smuad r6, r4, r10 @ b0 = W1 * f1 + W3 * f3
smlad r6, r5, r11, r6 @ + W5 * f5 + W7 * f7
smultt r7, r5, r10 @ b1 = -W7 * f3
smlabb r7, r4, r11, r7 @ + -W1 * f5
smlabt r7, r5, r11, r7 @ + -W5 * f7
rsb r7, r7, #0
smlatb r7, r4, r10, r7 @ + W3 * f1
smulbt r8, r4, r10 @ b2 = -W1 * f3
rsb r8, r8, #0
smlabb r8, r5, r10, r8 @ + W5 * f1
smlatb r8, r5, r11, r8 @ + W7 * f5
smlatt r8, r4, r11, r8 @ + W3 * f7
smultt r7, r5, r10 @ -b1 = W7 * f3
smulbt r8, r4, r10 @ -b2 = W1 * f3
smusdx r9, r10, r5 @ b3 = f1 * W7 - f3 * W5
smlsdx r9, r11, r4, r9 @ + f5 * W3 - f1 * W1
smlabb r7, r4, r11, r7 @ -b1 += W1 * f5
rsb r8, r8, #0 @ b2 = -b2
smlabb r8, r5, r10, r8 @ b2 += W5 * f1
smlad r6, r5, r11, r6 @ b0 += W5 * f5 + W7 * f7
smlabt r7, r5, r11, r7 @ -b1 += W5 * f7
smlatb r8, r5, r11, r8 @ b2 += W7 * f5
smlsdx r9, r11, r4, r9 @ b3 += f5 * W3 - f7 * W1
rsb r7, r7, #0 @ b1 = -b1
smlatb r7, r4, r10, r7 @ b1 += W3 * f1
smlatt r8, r4, r11, r8 @ b2 += W3 * f7
ldrd r4, L_W0246 @ load W0, W2, W4, W6
add r2, r2, #32 @ DC offset: 0.5
smulbb r10, r4, r2 @ a0' = W0 * f0
smlabb r10, r5, r3, r10 @ + W4 * f4
smultt r12, r4, r2 @ a3' = W2 * f2
smlatt r12, r5, r3, r12 @ + W6 * f6
smulbb r10, r5, r3 @ a0' = W4 * f4
smultt r12, r5, r3 @ a3' = W6 * f6
smultt r3, r4, r3 @ -a2' = W2 * f6
rsb r11, r10, #0 @ a1' = -W4 * f4
smlabb r10, r4, r2, r10 @ a0' += W0 * f0
smlabb r11, r4, r2, r11 @ a1' += W0 * f0
smlatt r12, r4, r2, r12 @ a3' += W2 * f2
rsb r3, r3, #0 @ a2' = -a2'
smlatt r3, r5, r2, r3 @ a2' += W6 * f2
add r10, r10, r12 @ a0 = a0' + a3'
sub r12, r10, r12, lsl #1 @ a3 = a0 - 2 * a3'
smulbb r11, r5, r3 @ a1' = -W4 * f4
rsb r11, r11, #0
smlabb r11, r4, r2, r11 @ + W0 * f0
smultt r3, r4, r3 @ a2' = -W2 * f6
rsb r3, r3, #0
smlatt r3, r5, r2, r3 @ + W6 * f2
add r11, r11, r3 @ a1 = a1' + a2'
sub r3, r11, r3, lsl #1 @ a2 = a1 - 2 * a2'
subs r14, r14, #1 @ decrease loop count
sub r2, r10, r6 @ block[7] = (a0 - b0)
mov r2, r2, asr #17 @ >> 17
strh r2, [r1, #7*16]
@ -190,7 +193,6 @@ L_W0246:
mov r2, r2, asr #17 @ >> 17
strh r2, [r1], #2 @ advance to next column
subs r14, r14, #1
bne .col_loop
sub r0, r0, #256 @ point r0 back to the input block