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Performance improved mult_16 without changing behaviour

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hugova 2025-03-25 21:40:40 +01:00
parent 7a5585d2c4
commit 41b8fec7a8
2 changed files with 14 additions and 10 deletions
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12
wip-hugo/macros/16aritmatic.s
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@ -69,13 +69,17 @@
;; Multiplication of 2 ;; Multiplication of 2
;; a = a*2 ;; a = a*2
.macro mult_16 low_, hi_, fast_unsafe .macro mult_16 low_, hi_, NOT_ROL
;; IF to run it fast ;; IF NOT_ROL
.ifblank fast_unsafe .ifblank fast_unsafe
CLC ASL low_
.endif ROL hi_
.else
ROL low_ ROL low_
ROL hi_ ROL hi_
.endif
.endmacro .endmacro
;;Larger then operation, uses the A register ;;Larger then operation, uses the A register

10
wip-hugo/routines/memory/pixel_draw.s
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@ -62,16 +62,16 @@ end__:
;;We need to calculate C*40. 40 = 2*2*2*(2^2 +1) ;;We need to calculate C*40. 40 = 2*2*2*(2^2 +1)
;; _*2^2 ;; _*2^2
mult_16 >C, <C, ! mult_16 >C, <C
mult_16 >C, <C, ! mult_16 >C, <C
;; + _*1 ;; + _*1
Add_16 >C, <C, >B, <B, ! Add_16 >C, <C, >B, <B, !
;; *2*2*2 ;; *2*2*2
mult_16 >C, <C, ! mult_16 >C, <C
mult_16 >C, <C, ! mult_16 >C, <C
mult_16 >C, <C, ! mult_16 >C, <C
Add_16 >btp_mem_pos, <btp_mem_pos, >C, <C, ! Add_16 >btp_mem_pos, <btp_mem_pos, >C, <C, !