Last change
on this file since 1ae3ac46 was
7bef8cf,
checked in by Peter A. Buhr <pabuhr@…>, 18 months ago
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start paper on llheap
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-
Property mode set to
100644
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File size:
1.6 KB
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1 | #include <stdio.h> |
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2 | |
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3 | typedef struct PingPong { |
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4 | int restart; // style 1 |
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5 | int N, i; |
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6 | const char * name; |
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7 | struct PingPong * partner; |
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8 | void * next; // style 2 |
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9 | } PingPong; |
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10 | #define PPCtor( name, N ) { 0, N, 0, name, NULL, NULL } |
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11 | |
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12 | void comain( PingPong * pp ) __attribute__(( noinline )); |
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13 | void comain( PingPong * pp ) { |
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14 | #if 0 |
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15 | if ( __builtin_expect(pp->next != 0, 1) ) goto *pp->next; |
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16 | pp->next = &&cycle; |
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17 | for ( ; pp->i < pp->N; pp->i += 1 ) { |
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18 | #ifdef PRINT |
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19 | printf( "%s %d\n", pp->name, pp->i ); |
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20 | #endif // PRINT |
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21 | asm( "mov %0,%%rdi" : "=m" (pp->partner) ); |
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22 | asm( "mov %rdi,%rax" ); |
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23 | #ifndef OPT |
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24 | #ifdef PRINT |
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25 | asm( "add $16, %rsp" ); |
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26 | #endif // PRINT |
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27 | asm( "popq %rbp" ); |
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28 | #endif // ! OPT |
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29 | |
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30 | #ifdef OPT |
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31 | #ifdef PRINT |
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32 | asm( "popq %rbx" ); |
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33 | #endif // PRINT |
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34 | #endif // OPT |
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35 | asm( "jmp comain" ); |
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36 | cycle: ; |
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37 | } // for |
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38 | #endif // 0 |
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39 | |
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40 | #if 1 |
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41 | static void * states[] = {&&s0, &&s1}; |
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42 | goto *states[pp->restart]; |
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43 | s0: pp->restart = 1; |
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44 | for ( ; pp->i < pp->N; pp->i += 1 ) { |
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45 | #ifdef PRINT |
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46 | printf( "%s %d\n", pp->name, pp->i ); |
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47 | #endif // PRINT |
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48 | asm( "mov %0,%%rdi" : "=m" (pp->partner) ); |
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49 | asm( "mov %rdi,%rax" ); |
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50 | #ifndef OPT |
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51 | #ifdef PRINT |
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52 | asm( "add $16, %rsp" ); |
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53 | #endif // PRINT |
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54 | asm( "popq %rbp" ); |
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55 | #endif // ! OPT |
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56 | |
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57 | #ifdef OPT |
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58 | #ifdef PRINT |
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59 | asm( "popq %rbx" ); |
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60 | #endif // PRINT |
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61 | #endif // OPT |
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62 | asm( "jmp comain" ); |
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63 | s1: ; |
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64 | } // for |
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65 | #endif // 0 |
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66 | } |
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67 | |
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68 | int main() { |
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69 | enum { N = |
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70 | #ifdef PRINT |
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71 | 5 |
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72 | #else |
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73 | 1000000000 |
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74 | #endif // PRINT |
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75 | }; |
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76 | PingPong ping = PPCtor( "ping", N ), pong = PPCtor( "pong", N ); |
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77 | ping.partner = &pong; pong.partner = &ping; |
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78 | comain( &ping ); |
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79 | } |
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80 | |
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81 | // Local Variables: // |
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82 | // tab-width: 4 // |
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83 | // compile-command: "gcc-9 -g -DPRINT PingPong.c" // |
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84 | // End: // |
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