Last change
on this file since 790d835 was
18783b4,
checked in by Peter A. Buhr <pabuhr@…>, 3 years ago
|
attempt to remove tail-recursion optimization
|
-
Property mode set to
100644
|
File size:
960 bytes
|
Line | |
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1 | // Resume Across Empty Function |
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2 | #include <clock.hfa> |
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3 | #include <exception.hfa> |
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4 | #include <fstream.hfa> |
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5 | #include <stdlib.hfa> // strto |
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6 | |
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7 | exception empty_exception; |
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8 | vtable(empty_exception) empty_vt; |
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9 | |
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10 | void nounwind_empty(unsigned int frames) { |
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11 | if (frames) { |
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12 | nounwind_empty(frames - 1); |
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13 | if ( frames == -1 ) printf( "42" ); // prevent recursion optimizations |
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14 | } else { |
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15 | throwResume (empty_exception){&empty_vt}; |
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16 | } |
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17 | } |
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18 | |
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19 | int main(int argc, char * argv[]) { |
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20 | unsigned int times = 1; |
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21 | unsigned int total_frames = 1; |
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22 | if (1 < argc) { |
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23 | times = strto(argv[1], 0p, 10); |
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24 | } |
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25 | if (2 < argc) { |
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26 | total_frames = strto(argv[2], 0p, 10); |
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27 | } |
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28 | |
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29 | Time start_time = timeHiRes(); |
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30 | for (unsigned int count = 0 ; count < times ; ++count) { |
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31 | try { |
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32 | nounwind_empty(total_frames); |
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33 | } catchResume (empty_exception *) { |
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34 | asm volatile ("# fixup block"); |
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35 | } |
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36 | } |
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37 | Time end_time = timeHiRes(); |
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38 | sout | "Run-Time (s): " | wd(0,1, (end_time - start_time)`ns / 1_000_000_000.); |
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39 | } |
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