use y register to save character
tay+tya is 4 cycles/2 bytes. lda (dp),y is 7 cycles/2 bytes
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f1b2db8e0b
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67805de910
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@ -20,18 +20,13 @@ def or_mask(cc):
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fn = lambda x, y: (x << 8) + (0x20 * y.islower())
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return reduce(fn, reversed(cc), 0)
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def load_char(asm, dirty, level, short_m, old, new):
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if old & ~new: dirty = True
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if dirty:
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if level == 0:
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asm.emit("lda (cp)", 2)
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else:
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asm.emit("lda (cp),y", 2)
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old = 0
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def mask_char(asm, short_m, old, new):
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if old == new: return new
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if old & ~new:
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asm.emit("tya", 1)
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if short_m: asm.emit("ora #${:02x}".format(new), 2)
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else: asm.emit("ora #${:04x}".format(new), 3)
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return new
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@ -45,12 +40,21 @@ def generate_asm(asm, d, level):
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short_m = single and not double
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mask = 0
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tay = False
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if flag_ci:
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single.sort(key = or_mask)
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double.sort(key = or_mask)
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if len(single): mask = or_mask(single[0])
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if len(double): mask = or_mask(double[0])
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# need special logic for short-m
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a = set([or_mask(x) for x in double])
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b = set([or_mask(x) for x in single])
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if (0x2000 in a) and (0x0020 in a): tay = True
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if (0x0000 in b) and (0x0020 in a): tay = True
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if (0x0000 in b) and (0x2020 in a): tay = True
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count = len(d)
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if "" in d: count = count - 1
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@ -59,16 +63,21 @@ def generate_asm(asm, d, level):
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if short_m:
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asm.emit("longa off", 0)
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asm.emit("sep #$20", 2)
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if level>0:
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asm.emit("ldy #{}".format(level * 2), 3)
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mask = load_char(asm, True, level, short_m, 0, mask)
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if level==0:
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asm.emit("lda (cp)", 2)
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else:
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asm.emit("ldy #{}".format(level * 2), 3)
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asm.emit("lda (cp),y", 2)
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if tay: asm.emit("tay", 1)
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if flag_ci: mask = mask_char(asm, short_m, 0, mask)
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for k in double:
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dd = d[k]
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l = asm.reserve_label()
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if flag_ci:
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mask = load_char(asm, False, level, short_m, mask, or_mask(k))
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if flag_ci: mask = mask_char(asm, short_m, mask, or_mask(k))
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asm.emit("cmp #${:04x}\t; '{}'".format(str_to_int(k), str_to_print(k)), 3)
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asm.bne(l)
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generate_asm(asm, dd, level+1)
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@ -83,8 +92,7 @@ def generate_asm(asm, d, level):
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for k in single:
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dd = d[k]
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l = asm.reserve_label()
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if flag_ci:
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mask = load_char(asm, False, level, short_m, mask, or_mask(k))
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if flag_ci: mask = mask_char(asm, short_m, mask, or_mask(k))
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asm.emit("cmp #${:02x}\t; '{}'".format(str_to_int(k), str_to_print(k)), 2)
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asm.bne(l)
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generate_asm(asm, dd, level+1)
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