ADTast-experimentalenumforall-pointer-decaypthread-emulationqualifiedEnum
Last change
on this file since 49b3389 was
18783b4,
checked in by Peter A. Buhr <pabuhr@…>, 3 years ago
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attempt to remove tail-recursion optimization
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-
Property mode set to
100644
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File size:
965 bytes
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Line | |
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1 | // Resume Across Fixup |
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2 | #include <clock.hfa> |
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3 | #include <fstream.hfa> |
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4 | #include <stdlib.hfa> // strto |
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5 | |
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6 | void nounwind_fixup(unsigned int frames, void (*raised_rtn)(int &)) { |
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7 | if (frames) { |
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8 | nounwind_fixup(frames - 1, raised_rtn); |
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9 | if ( frames == -1 ) printf( "42" ); // prevent recursion optimizations |
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10 | } else { |
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11 | int fixup = 17; |
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12 | raised_rtn(fixup); |
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13 | } |
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14 | } |
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15 | |
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16 | int main(int argc, char * argv[]) { |
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17 | unsigned int times = 1; |
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18 | unsigned int total_frames = 1; |
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19 | if (1 < argc) { |
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20 | times = strto(argv[1], 0p, 10); |
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21 | } |
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22 | if (2 < argc) { |
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23 | total_frames = strto(argv[2], 0p, 10); |
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24 | } |
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25 | |
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26 | void raised(int & fixup) { |
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27 | fixup = total_frames + 42; // use local scope => lexical link |
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28 | if ( total_frames == 42 ) printf( "42" ); |
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29 | } |
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30 | |
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31 | Time start_time = timeHiRes(); |
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32 | for (unsigned int count = 0 ; count < times ; ++count) { |
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33 | nounwind_fixup(total_frames, raised); |
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34 | } |
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35 | Time end_time = timeHiRes(); |
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36 | sout | "Run-Time (s): " | wd(0,1, (end_time - start_time)`ns / 1_000_000_000.); |
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37 | } |
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