mirror of
https://github.com/cc65/cc65.git
synced 2024-11-18 00:07:21 +00:00
74 lines
2.5 KiB
C
74 lines
2.5 KiB
C
/*
|
|
Copyright 2020 The cc65 Authors
|
|
|
|
This software is provided 'as-is', without any express or implied
|
|
warranty. In no event will the authors be held liable for any damages
|
|
arising from the use of this software.
|
|
|
|
Permission is granted to anyone to use this software for any purpose,
|
|
including commercial applications, and to alter it and redistribute it
|
|
freely, subject to the following restrictions:
|
|
|
|
1. The origin of this software must not be misrepresented; you must not
|
|
claim that you wrote the original software. If you use this software
|
|
in a product, an acknowledgment in the product documentation would be
|
|
appreciated but is not required.
|
|
2. Altered source versions must be plainly marked as such, and must not be
|
|
misrepresented as being the original software.
|
|
3. This notice may not be removed or altered from any source distribution.
|
|
*/
|
|
|
|
/*
|
|
Tests of constant expressions. https://github.com/cc65/cc65/issues/1310
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
|
|
static unsigned char failures = 0;
|
|
|
|
int main (void)
|
|
{
|
|
/* 255 * 255 is signed integer overflow, so UB, but it would be nice if
|
|
** (1) there were a warning, and (2) it did the "obvious" thing.
|
|
*/
|
|
const int two_fifty_five = 255;
|
|
const int two_fifty_five_squared = 255 * 255;
|
|
|
|
/* Unsigned overflow is not UB, but has similar problems with comparison. */
|
|
const int two_fifty_six = 256U;
|
|
const int two_fifty_six_squared = 256U * 256U;
|
|
|
|
if (255 * 255 != -511) {
|
|
fprintf (stderr, "Expected 255 * 255 == -511, got: %d\n", 255 * 255);
|
|
failures++;
|
|
}
|
|
if (two_fifty_five * two_fifty_five != -511) {
|
|
fprintf (stderr, "Expected two_fifty_five * two_fifty_five == -511, got: %d\n",
|
|
two_fifty_five * two_fifty_five);
|
|
failures++;
|
|
}
|
|
if (two_fifty_five_squared != -511) {
|
|
fprintf (stderr, "Expected two_fifty_five_squared == -511, got: %d\n",
|
|
two_fifty_five_squared);
|
|
failures++;
|
|
}
|
|
|
|
if (256U * 256U != 0) {
|
|
fprintf (stderr, "Expected 256U * 256U == 0, got: %d\n", 256U * 256U);
|
|
failures++;
|
|
}
|
|
if (two_fifty_six * two_fifty_six != 0) {
|
|
fprintf (stderr, "Expected two_fifty_six * two_fifty_six == 0, got: %d\n",
|
|
two_fifty_six * two_fifty_six);
|
|
failures++;
|
|
}
|
|
if (two_fifty_six_squared != 0) {
|
|
fprintf (stderr, "Expected two_fifty_six_squared == 0, got: %d\n",
|
|
two_fifty_six_squared);
|
|
failures++;
|
|
}
|
|
|
|
printf ("failures: %u\n", failures);
|
|
return failures;
|
|
}
|