mirror of
https://git.code.sf.net/p/quake/quakeforge
synced 2024-12-12 21:52:32 +00:00
cfaf158ebc
Just 32-bit rounding to next higher power of two, and base 2 logarithm. Most importantly, they are suitable for use in initializers as they are constant in, constant out.
55 lines
1.1 KiB
C
55 lines
1.1 KiB
C
#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <stdio.h>
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#include "QF/math/bitop.h"
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struct {
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uint32_t value;
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uint32_t expect;
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} tests [] = {
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{BITOP_RUP(1), 1},
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{BITOP_RUP(2), 2},
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{BITOP_RUP(3), 4},
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{BITOP_RUP(4), 4},
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{BITOP_RUP(5), 8},
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{BITOP_RUP(7), 8},
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{BITOP_RUP(8), 8},
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{BITOP_RUP(0x40000000), 0x40000000},
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{BITOP_RUP(0x40000001), 0x80000000},
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{BITOP_LOG2(1), 0},
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{BITOP_LOG2(2), 1},
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{BITOP_LOG2(3), 2},
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{BITOP_LOG2(4), 2},
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{BITOP_LOG2(5), 3},
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{BITOP_LOG2(7), 3},
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{BITOP_LOG2(8), 3},
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{BITOP_LOG2(9), 4},
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{BITOP_LOG2(15), 4},
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{BITOP_LOG2(16), 4},
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{BITOP_LOG2(17), 5},
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{BITOP_LOG2(31), 5},
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{BITOP_LOG2(32), 5},
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{BITOP_LOG2(33), 6},
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{BITOP_LOG2(0x40000000), 30},
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{BITOP_LOG2(0x40000001), 31},
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};
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#define num_tests (sizeof (tests) / sizeof (tests[0]))
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int
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main (int argc, const char **argv)
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{
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size_t i;
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int res = 0;
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for (i = 0; i < num_tests; i++) {
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if (tests[i].value != tests[i].expect) {
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res |= 1;
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printf ("test %d failed\n", (int) i);
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printf ("expect: %8x\n", tests[i].expect);
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printf ("got : %8x\n", tests[i].value);
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}
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}
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return res;
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}
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