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@@ -2,6 +2,7 @@
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│vi: set et ft=asm ts=8 tw=8 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2021 Justine Alexandra Roberts Tunney │
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+│ Some size optimisations by Peter Ferrie │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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@@ -17,7 +18,7 @@
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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-// compliant brainfuck in 87 bytes
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+// compliant brainfuck in 83 bytes
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// boots from bios on pc w/ 128kb+
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.code16
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@@ -35,21 +36,22 @@ Brain: xor %ax,%ax
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mov %al,(%si)
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inc %dx
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Fuck: lodsb
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+ cbw
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cmp $'>',%al
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je Right
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cmp $'<',%al
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je Left
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- cmp $'+',%al
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+ sub $'+',%al
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je Inc
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- cmp $'-',%al
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+ dec %ax
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+ je Get
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+ dec %ax
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je Dec
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- cmp $'.',%al
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+ dec %ax
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je Put
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- cmp $',',%al
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- je Get
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- cmp $']',%al
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+ cmp $']'-'.',%al
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je Loop
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- cmp $'[',%al
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+ cmp $'['-'.',%al
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jne Brain
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Do: push %si
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Loop: pop %ax
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@@ -59,8 +61,6 @@ Loop: pop %ax
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xchg %ax,%si
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jmp Brain
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Inc: incb (%di)
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- .byte 0x3C
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-Left: dec %di
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.byte 0x80
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Dec: decb (%di)
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.byte 0x3C
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@@ -71,5 +71,6 @@ Put: mov $0x0e,%ah
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int $0x10
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jmp Brain
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Get: int $0x16
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- mov %al,(%di)
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+ stosb
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+Left: dec %di
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jmp Brain
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Peter Ferrie