mirror of
https://github.com/cc65/cc65.git
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157 lines
2.5 KiB
C
157 lines
2.5 KiB
C
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/*
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!!DESCRIPTION!! Optimized-shift signed ints right by a constant; and, assign to chars.
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!!ORIGIN!! cc65 regression tests
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!!LICENCE!! Public Domain
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!!AUTHOR!! Greg King
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*/
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#include <stdio.h>
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static unsigned char failures = 0;
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static unsigned char n = 0;
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/* This number must be read from a variable because
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** we want this program, not cc65, to do the shift.
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*/
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static const signed int aint0 = 0xAAC0;
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static signed char achar0, achar1;
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static void check(void)
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{
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if ((unsigned char)achar0 != (unsigned char)achar1)
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++failures;
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}
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static void shift_right_0(void)
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{
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achar0 = aint0 >> 0;
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check();
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}
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static void shift_right_1(void)
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{
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achar0 = aint0 >> 1;
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check();
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}
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static void shift_right_2(void)
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{
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achar0 = aint0 >> 2;
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check();
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}
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static void shift_right_3(void)
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{
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achar0 = aint0 >> 3;
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check();
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}
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static void shift_right_4(void)
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{
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achar0 = aint0 >> 4;
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check();
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}
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static void shift_right_5(void)
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{
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achar0 = aint0 >> 5;
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check();
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}
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static void shift_right_6(void)
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{
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achar0 = aint0 >> 6;
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check();
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}
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static void shift_right_7(void)
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{
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achar0 = aint0 >> 7;
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check();
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}
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static void shift_right_8(void)
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{
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achar0 = aint0 >> 8;
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check();
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}
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static void shift_right_9(void)
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{
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achar0 = aint0 >> 9;
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check();
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}
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static void shift_right_10(void)
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{
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achar0 = aint0 >> 10;
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check();
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}
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static void shift_right_11(void)
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{
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achar0 = aint0 >> 11;
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check();
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}
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static void shift_right_12(void)
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{
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achar0 = aint0 >> 12;
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check();
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}
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static void shift_right_13(void)
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{
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achar0 = aint0 >> 13;
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check();
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}
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static void shift_right_14(void)
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{
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achar0 = aint0 >> 14;
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check();
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}
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static void shift_right_15(void)
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{
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achar0 = aint0 >> 15;
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check();
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}
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const struct {
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signed char achar;
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void (*func)(void);
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} tests[] = {
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{0xC0, shift_right_0},
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{0x60, shift_right_1},
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{0xB0, shift_right_2},
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{0x58, shift_right_3},
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{0xAC, shift_right_4},
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{0x56, shift_right_5},
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{0xAB, shift_right_6},
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{0x55, shift_right_7},
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{0xAA, shift_right_8},
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{0xD5, shift_right_9},
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{0xEA, shift_right_10},
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{0xF5, shift_right_11},
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{0xFA, shift_right_12},
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{0xFD, shift_right_13},
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{0xFE, shift_right_14},
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{0xFF, shift_right_15}
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};
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int main(void)
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{
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do {
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achar1 = tests[n].achar;
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tests[n].func();
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} while (++n < sizeof tests / sizeof tests[0]);
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if (failures) {
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printf("rotate8: failures: %u (of %u).\n",
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failures, sizeof tests / sizeof tests[0]);
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}
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return failures;
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}
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