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replace 'sub ax,2' with two times 'dec ax', #9

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replace 'sub ax,2' with two times 'dec ax', #9

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6 changes: 4 additions & 2 deletions sectorc.s
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Original file line number Diff line number Diff line change
Expand Up @@ -114,7 +114,8 @@ compile_stmts:

mov ax,[bx] ; load function offset from symbol-table
sub ax,di ; compute relative to this location: "dest - cur - 2"
sub ax,2
dec ax ; (shorter than 'sub ax,2')
dec ax
stosw ; emit target

jmp compile_stmts_tok_next2 ; loop to compile next statement
Expand Down Expand Up @@ -148,7 +149,8 @@ _patch_back:
stosb
pop ax ; restore loop start location
sub ax,di ; compute relative to this location: "dest - cur - 2"
sub ax,2
dec ax ; (shorter than 'sub ax,2')
dec ax
stosw ; emit target
;; [fall-through]
_patch_fwd:
Expand Down