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55 lines
1.6 KiB
ArmAsm
55 lines
1.6 KiB
ArmAsm
;
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; Ullrich von Bassewitz, 05.08.1998
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; Christian Krueger, 11-Mar-2017, spend two bytes for one cycle, improved 65SC02 optimization
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;
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; CC65 runtime: add ints
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;
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; Make this as fast as possible, even if it needs more space since it's
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; called a lot!
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.export tosadda0, tosaddax
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.importzp sp, tmp1
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.macpack cpu
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tosadda0:
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ldx #0
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tosaddax:
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clc ; (2)
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.if (.cpu .bitand ::CPU_ISET_65SC02)
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adc (sp) ; (7)
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tay ; (9)
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inc sp ; (14)
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bne hiadd ; (17)
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inc sp+1 ; (-1+5)
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hiadd: txa ; (19)
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adc (sp) ; (24)
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tax ; (26)
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inc sp ; (31)
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bne done ; (34)
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inc sp+1 ; (-1+5)
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done: tya ; (36)
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.else
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ldy #0 ; (4)
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adc (sp),y ; (9) lo byte
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iny ; (11)
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sta tmp1 ; (14) save it
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txa ; (16)
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adc (sp),y ; (21) hi byte
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tax ; (23)
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clc ; (25)
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lda sp ; (28)
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adc #2 ; (30)
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sta sp ; (33)
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bcc L1 ; (36)
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inc sp+1 ; (-1+5)
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L1: lda tmp1 ; (39) restore low byte
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.endif
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rts ; (6502: 45 cycles, 26 bytes <-> 65SC02: 42 cycles, 22 bytes )
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