6502/cc65
1
0
Fork 0
mirror of https://github.com/cc65/cc65.git synced 2024-12-23 04:30:10 +00:00
Code Issues Projects Releases Wiki Activity

Added a test program to test the 16 bit shift ops.

Browse Source 
git-svn-id: svn://svn.cc65.org/cc65/trunk@5782 b7a2c559-68d2-44c3-8de9-860c34a00d81
This commit is contained in:
uz 2012-07-12 21:11:21 +00:00
parent 49e5d19950
commit 18f22506ba
1 changed files with 136 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

136
testcode/lib/shift-test.c Normal file
View File

@ -0,0 +1,136 @@
#include <stdio.h>
#include <stdlib.h>
static unsigned UnsignedShiftLeft1 (unsigned Val)
/* Shift an unsigned left by 1 */
{
__AX__ = Val;
asm ("stx tmp1");
asm ("asl a");
asm ("rol tmp1");
asm ("ldx tmp1");
return __AX__;
}
static unsigned UnsignedShiftRight1 (unsigned Val)
/* Shift an unsigned right by 1 */
{
__AX__ = Val;
asm ("stx tmp1");
asm ("lsr tmp1");
asm ("ror a");
asm ("ldx tmp1");
return __AX__;
}
static int SignedShiftRight1 (int Val)
/* Shift a signed right by 1 */
{
__AX__ = Val;
asm ("stx tmp1");
asm ("cpx #$80");
asm ("ror tmp1");
asm ("ror a");
asm ("ldx tmp1");
return __AX__;
}
static void TestUnsignedLeftShift (void)
/* Test left shift. This is identical for signed and unsigned ints */
{
unsigned L, R, V;
printf ("Testing unsigned left shift:\n");
L = 0;
do {
V = L;
for (R = 0; R < 16; ++R) {
/* Check it */
if ((L << R) != V) {
fprintf (stderr,
"Failed: %u << %u != %u (%u)\n",
L, R, V, L << R);
exit (1);
}
V = UnsignedShiftLeft1 (V);
}
if ((L & 0xFF) == 0) {
printf ("%04X ", L);
}
} while (++L != 0);
printf ("\n");
}
static void TestUnsignedRightShift (void)
/* Test unsigned right shift. */
{
unsigned L, R, V;
printf ("Testing unsigned right shift:\n");
L = 0;
do {
V = L;
for (R = 0; R < 16; ++R) {
/* Check it */
if ((L >> R) != V) {
fprintf (stderr,
"Failed: %u >> %u != %u (%u)\n",
L, R, V, L >> R);
exit (1);
}
V = UnsignedShiftRight1 (V);
}
if ((L & 0xFF) == 0) {
printf ("%04X ", L);
}
} while (++L != 0);
printf ("\n");
}
static void TestSignedRightShift (void)
/* Test signed right shift. */
{
int L, R, V;
printf ("Testing signed right shift:\n");
L = 0;
do {
V = L;
for (R = 0; R < 16; ++R) {
/* Check it */
if ((L >> R) != V) {
fprintf (stderr,
"Failed: %d >> %d != %d (%d)\n",
L, R, V, L >> R);
exit (1);
}
V = SignedShiftRight1 (V);
}
if ((L & 0xFF) == 0) {
printf ("%04X ", L);
}
} while (++L != 0);
printf ("\n");
}
int main (void)
{
TestUnsignedLeftShift ();
TestUnsignedRightShift ();
TestSignedRightShift ();
printf ("\nOk!\n");
return 0;
}