89 lines
1.8 KiB
C
89 lines
1.8 KiB
C
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#include <assert.h>
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#include <stdio.h>
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#include <stdlib.h>
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static void next_power2(const char* type, size_t N) {
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assert(N > 0);
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/* https://graphics.stanford.edu/~seander/bithacks.html#RoundUpPowerOf2 */
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printf("%s%zu_t math_%s%zu_next_power2(%s%zu_t x) {", type, N, type, N, type, N);
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printf("--x;");
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for (size_t i = 1; i < N; i*=2) {
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printf("x |= x >> %zu;", i);
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}
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printf("return ++x;");
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printf("}\n");
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}
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static void gcd(const char* type, size_t N) {
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assert(N > 0);
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printf("%s%zu_t math_%s%zu_gcd(%s%zu_t x, %s%zu_t y) {", type, N, type, N, type, N, type, N);
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printf("assert(x > 0);");
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printf("assert(y > 0);");
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printf("if (x < y) return math_%s%zu_gcd(y, x);", type, N);
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printf("%s%zu_t z;", type, N);
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printf("while (y) {");
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printf("z = x%%y;");
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printf("x = y;");
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printf("y = z;");
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printf("}");
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printf("return x;}\n");
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}
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static void lcm(const char* type, size_t N) {
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assert(N > 0);
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printf("%s%zu_t math_%s%zu_lcm(%s%zu_t x, %s%zu_t y) {", type, N, type, N, type, N, type, N);
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printf("assert(x > 0);");
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printf("assert(y > 0);");
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printf("return x / math_%s%zu_gcd(x, y) * y;}\n", type, N);
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}
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int main(int argc, char** argv) {
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(void) argc, (void) argv;
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printf("#include \"./algorithm.h\"\n");
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printf("#include <assert.h>\n");
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printf("#include <stdint.h>\n");
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next_power2("int", 8);
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next_power2("int", 16);
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next_power2("int", 32);
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next_power2("int", 64);
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next_power2("uint", 8);
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next_power2("uint", 16);
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next_power2("uint", 32);
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next_power2("uint", 64);
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gcd("int", 8);
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gcd("int", 16);
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gcd("int", 32);
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gcd("int", 64);
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gcd("uint", 8);
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gcd("uint", 16);
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gcd("uint", 32);
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gcd("uint", 64);
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lcm("int", 8);
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lcm("int", 16);
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lcm("int", 32);
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lcm("int", 64);
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lcm("uint", 8);
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lcm("uint", 16);
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lcm("uint", 32);
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lcm("uint", 64);
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return EXIT_SUCCESS;
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}
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