From c2628f3af96f4a2a539d3f179988251a8b6301db Mon Sep 17 00:00:00 2001 From: Thom Johansen Date: Thu, 27 Oct 2005 11:00:24 +0000 Subject: Replaced jump table with a more efficient one. git-svn-id: svn://svn.rockbox.org/rockbox/trunk@7658 a1c6a512-1295-4272-9138-f99709370657 --- apps/codecs/libffmpegFLAC/coldfire.S | 25 +++++++++++-------------- 1 file changed, 11 insertions(+), 14 deletions(-) diff --git a/apps/codecs/libffmpegFLAC/coldfire.S b/apps/codecs/libffmpegFLAC/coldfire.S index 7e19e4b695..720e6edd86 100644 --- a/apps/codecs/libffmpegFLAC/coldfire.S +++ b/apps/codecs/libffmpegFLAC/coldfire.S @@ -48,21 +48,18 @@ lpc_decode_emac: moveq.l #8, %d3 cmp.l %d3, %d2 jgt .default | order is over 8, jump to default case - lea.l .jumptable, %a4 - move.l (%a4, %d2.l*4), %a4 - jmp (%a4) - .align 4 | avoid unaligned fetch + jmp.l (2, %pc, %d2.l*4) | jump to loop corresponding to pred_order .jumptable: - .long .exit - .long .order1 - .long .order2 - .long .order3 - .long .order4 - .long .order5 - .long .order6 - .long .order7 - .long .order8 + bra.w .exit | zero order filter isn't possible, exit function + bra.w .order1 + bra.w .order2 + bra.w .order3 + bra.w .order4 + bra.w .order5 + bra.w .order6 + bra.w .order7 +| last jump table entry coincides with target, so leave it out .order8: movem.l (%a1), %d3-%d7/%a2-%a4 | load lpc coefs move.l (%a0)+, %a5 | load first history sample @@ -78,7 +75,7 @@ lpc_decode_emac: movclr.l %acc0, %d2 | get sum asr.l %d1, %d2 | shift sum by lp_quantization bits add.l %d2, (%a0) | add residual and save - lea.l (-6*4, %a0), %a0 | history pointer points at second element + lea.l (-6*4, %a0), %a0 | point history back at second element subq.l #1, %d0 | decrement counter jne .loop8 | are we done? jra .exit -- cgit v1.2.3