Last change
on this file since 444 was
444,
checked in by satin@…, 6 years ago
|
add newlib,libalmos-mkh, restructure shared_syscalls.h and mini-libc
|
File size:
762 bytes
|
Rev | Line | |
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[444] | 1 | |
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| 2 | typedef union { |
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| 3 | struct { |
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| 4 | unsigned int msw; |
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| 5 | unsigned int lsw; |
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| 6 | } s; |
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| 7 | long v; |
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| 8 | } u; |
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| 9 | |
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| 10 | long __mulsi3(u a, u b) |
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| 11 | { |
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| 12 | int s; |
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| 13 | long pp1; |
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| 14 | long pp2; |
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| 15 | long r; |
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| 16 | |
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| 17 | if (a.s.msw == 0 && |
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| 18 | b.s.msw == 0) |
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| 19 | { |
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| 20 | return (long)a.s.lsw * b.s.lsw; |
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| 21 | } |
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| 22 | |
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| 23 | s = 0; |
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| 24 | if (a.v < 0) |
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| 25 | { |
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| 26 | s = 1; |
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| 27 | a.v = - a.v; |
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| 28 | } |
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| 29 | if (b.v < 0) |
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| 30 | { |
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| 31 | s = 1-s; |
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| 32 | b.v = - b.v; |
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| 33 | } |
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| 34 | |
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| 35 | pp1 = (long)a.s.lsw * b.s.lsw ; |
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| 36 | pp2 = (long)a.s.lsw * b.s.msw + (long)a.s.msw * b.s.lsw; |
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| 37 | |
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| 38 | pp1 += pp2 << 16; |
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| 39 | |
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| 40 | if (s) |
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| 41 | { |
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| 42 | pp1 = -pp1; |
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| 43 | } |
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| 44 | return pp1; |
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| 45 | } |
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| 46 | long __mulpsi3(long a, long b) |
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| 47 | { |
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| 48 | return a*b; |
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| 49 | } |
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| 50 | |
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| 51 | |
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| 52 | short |
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| 53 | __mulhi3(short a, short b) |
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| 54 | { |
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| 55 | int r; |
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| 56 | |
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| 57 | r = 0; |
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| 58 | while (a) |
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| 59 | { |
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| 60 | if (a & 1) |
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| 61 | { |
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| 62 | r += b; |
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| 63 | |
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| 64 | } |
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| 65 | b<<=1; |
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| 66 | a>>=1; |
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| 67 | |
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| 68 | } |
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| 69 | return r; |
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| 70 | } |
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| 71 | |
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| 72 | |
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