From f174c3513b4b2a4a0583a2b72ee442bbb211d442 Mon Sep 17 00:00:00 2001
From: Nils Wallménius <nils@rockbox.org>
Date: Fri, 5 Nov 2010 16:21:25 +0000
Subject: libmusepack: use postindexing on the pointer when storing to
 increment it for free, saves another instruction in the loop in
 mpc_decoder_windowing_D speed difference is in the noise though.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@28492 a1c6a512-1295-4272-9138-f99709370657
---
 apps/codecs/libmusepack/synth_filter_arm.S | 9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

(limited to 'apps')

diff --git a/apps/codecs/libmusepack/synth_filter_arm.S b/apps/codecs/libmusepack/synth_filter_arm.S
index 521d690e28..9bd4e04626 100644
--- a/apps/codecs/libmusepack/synth_filter_arm.S
+++ b/apps/codecs/libmusepack/synth_filter_arm.S
@@ -238,13 +238,12 @@ mpc_decoder_windowing_D:
     /* store Data[01..15] */
     mov r8, r8, lsr #16
     orr r8, r8, r9, lsl #16     /* (lo>>16) || (hi<<16) */
-    str r8, [r0]                /* store Data */
     /* store Data[31..17] */
     mov r10, r10, lsr #16
     orr r10, r10, r11, lsl #16  /* (lo>>16) || (hi<<16) */
     rsb r10, r10, #0            /* r10 = -r10 */
     str r10, [r0, lr]           /* store Data */
-    add r0, r0, #4              /* r0++ */
+    str r8, [r0], #4            /* store Data */
     /* correct adresses for next loop */
     sub r12, r12, #4            /* r12 = V-- */
     add r1, r1, #4              /* r1  = V++ */
@@ -441,13 +440,12 @@ mpc_decoder_windowing_D:
     /* store Data[01..15] */
     mov r8, r8, lsr #16
     orr r8, r8, r9, lsl #16     /* (lo>>16) || (hi<<16) */
-    str r8, [r0]                /* store Data */
     /* store Data[31..17] */
     mov r10, r10, lsr #16
     orr r10, r10, r11, lsl #16  /* (lo>>16) || (hi<<16) */
     rsb r10, r10, #0            /* r10 = -r10 */
     str r10, [r0, lr]           /* store Data */
-    add r0, r0, #4              /* r0++ */
+    str r8, [r0], #4            /* store Data */
     /* correct adresses for next loop */
     sub r12, r12, #4            /* r12 = V-- */
     add r1, r1, #4              /* r1  = V++ */
@@ -641,11 +639,10 @@ mpc_decoder_windowing_D:
     rsb r11, r11, #0            /* r11 = -r11 */
     /* store Data[01..15] */
     mov r9, r9, lsl #2
-    str r9, [r0]                /* store Data */
     /* store Data[31..17] */
     mov r11, r11, lsl #2
     str r11, [r0, lr]           /* store Data */
-    add r0, r0, #4              /* r0++ */
+    str r9, [r0], #4            /* store Data */
     /* next loop */
     subs lr, lr, #8
     bgt .loop15
-- 
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