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Add tests for u8 op s16_const

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Test expressions like `unsigned char x = ...; ... = x / 2;`
These use `int` constants with values representable by
`unsigned int` / `unsigned char`, so using unsigned codegen should
be possible.

Additional tests for #1308.  These are things we want to generate better
code for, so add tests that the behavior doesn't change.
This commit is contained in:
Jesse Rosenstock 2020-10-31 18:20:15 +01:00 • committed by Oliver Schmidt
parent 5db74b4b19
commit 93145246fd
1 changed files with 45 additions and 1 deletions
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46
test/val/char-promote.c
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@ -54,6 +54,8 @@ void test_sub (void)
void test_mul (void)
{
const u8 two_fifty_five = 255;
const u8 sixteen = 16;
int x;
if (255U * 255U != 65025U) {
fprintf (stderr, "Expected 255U * 255U == 65025U\n");
@ -83,12 +85,20 @@ void test_mul (void)
failures++;
}
#endif
/* This should compile to a shift. */
x = sixteen * 4;
if (x != 64) {
fprintf (stderr, "Expected sixteen * 4 == 64, got: %d\n", x);
failures++;
}
}
void test_div (void)
{
const u8 seventeen = 17;
const u8 three = 3;
int x;
/* We should also be able to observe that, due to optimizations from #1315, the generated code
** uses udiv, not div.
@ -101,24 +111,57 @@ void test_div (void)
fprintf (stderr, "Expected (u8) 17 / (u8) 3 == 5, got: %d\n", (u8) 17 / (u8) 3);
failures++;
}
/* Ideally, this would compile to a logical shift, but that does not happen currently. */
x = seventeen / 4;
if (x != 4) {
fprintf (stderr, "Expected seventeen / 4 == 4, got: %d\n", x);
failures++;
}
}
void test_mod (void)
{
const u8 seventeen = 17;
/* Ideally, this would compile to a bitwise and, but that does not happen currently. */
int x = seventeen % 4;
if (x != 1) {
fprintf (stderr, "Expected seventeen %% 4 == 1, got: %d\n", x);
failures++;
}
}
void test_shr (void)
{
const unsigned int forty_two = 42;
const unsigned int two = 2;
int x;
/* We should also be able to observe that, due to optimizations from #1315, the generated code
** uses shr, not asr.
*/
if (forty_two >> two != 10) {
fprintf (stderr, "Expected forty_two / two == 10, got: %d\n", forty_two >> two);
fprintf (stderr, "Expected forty_two >> two == 10, got: %d\n", forty_two >> two);
failures++;
}
if ((u8) 42 >> (u8) 2 != 10) {
fprintf (stderr, "Expected (u8) 42 >> (u8) 2 == 10, got: %d\n", (u8) 42 >> (u8) 3);
failures++;
}
/* Ideally, this would compile to a logical shift, but that does not happen currently. */
x = forty_two >> 2;
if (x != 10) {
fprintf (stderr, "Expected forty_two >> 2 == 10, got: %d\n", x);
failures++;
}
/* Ideally, this would compile to a logical shift, but that does not happen currently. */
x = 42 >> two;
if (x != 10) {
fprintf (stderr, "Expected 42 >> two == 10, got: %d\n", x);
failures++;
}
}
int main (void)
@ -126,6 +169,7 @@ int main (void)
test_sub ();
test_mul ();
test_div ();
test_mod ();
test_shr ();
printf ("failures: %u\n", failures);
return failures;