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Rearrange "CLRA" instruction for slight speed optimization in 6809 LZSA depacker

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Doug Masten 2020-06-21 12:16:07 -05:00
parent b5b8ca556a
commit 06d63de9d7
1 changed files with 1 additions and 1 deletions
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asm/6809/unlzsa1.s
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@ -64,9 +64,9 @@ lz1cpymt lda ,u+ ; copy matched byte
lz1token ldb ,x+ ; load next token into B: O|LLL|MMMM lz1token ldb ,x+ ; load next token into B: O|LLL|MMMM
pshs b ; save it pshs b ; save it
clra ; clear A (high part of literals count)
andb #$70 ; isolate LLL (embedded literals count) in B andb #$70 ; isolate LLL (embedded literals count) in B
beq lz1nolt ; skip if no literals beq lz1nolt ; skip if no literals
clra ; clear A (high part of literals count)
cmpb #$70 ; LITERALS_RUN_LEN? cmpb #$70 ; LITERALS_RUN_LEN?
bne lz1declt ; if not, we have the complete count, go unshift bne lz1declt ; if not, we have the complete count, go unshift