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| 1 | ! sub64u() - unsigned from 64 bit subtraction Author: Kees J. Bot
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| 2 | ! 24 Dec 1995
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| 3 | .sect .text
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| 4 | .define _sub64u, _sub64ul
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| 5 |
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| 6 | _sub64u: ! u64_t sub64u(u64_t i, unsigned j);
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| 7 | push bp
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| 8 | mov bp, sp
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| 9 | xor cx, cx
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| 10 | jmp 0f
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| 11 | _sub64ul: ! u64_t sub64ul(u64_t i, unsigned long j);
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| 12 | push bp
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| 13 | mov bp, sp
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| 14 | mov cx, 16(bp)
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| 15 | 0: mov bx, 4(bp)
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| 16 | mov ax, 6(bp)
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| 17 | sub ax, 14(bp)
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| 18 | mov (bx), ax
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| 19 | mov ax, 8(bp)
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| 20 | sbb ax, cx
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| 21 | mov 2(bx), ax
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| 22 | mov ax, 10(bp)
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| 23 | sbb ax, #0
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| 24 | mov 4(bx), ax
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| 25 | mov ax, 12(bp)
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| 26 | sbb ax, #0
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| 27 | mov 6(bx), ax
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| 28 | mov ax, bx
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| 29 | pop bp
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| 30 | ret
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