6502/cc65
1
0
Fork 0
mirror of https://github.com/cc65/cc65.git synced 2024-12-28 06:30:16 +00:00
Code Issues Projects Releases Wiki Activity

Better code for > compares

Browse Source 
git-svn-id: svn://svn.cc65.org/cc65/trunk@823 b7a2c559-68d2-44c3-8de9-860c34a00d81
This commit is contained in:
cuz 2001-07-26 06:10:10 +00:00
parent d604ed5e3f
commit 58592116ac
1 changed files with 78 additions and 59 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

137
src/cc65/codegen.c
View File

@ -3559,31 +3559,31 @@ void g_le (unsigned flags, unsigned long val)
*/
if (flags & CF_CONST) {
/* <= is not very effective on the 6502, so try to convert
* it into < if the value is in a valid range.
*/
/* <= is not very effective on the 6502, so try to convert
* it into < if the value is in a valid range.
*/
/* Look at the type */
switch (flags & CF_TYPE) {
case CF_CHAR:
if (flags & CF_FORCECHAR) {
if (flags & CF_UNSIGNED) {
if (val < 255) {
AddCodeLine ("cmp #$%02X", (unsigned char)val+1);
AddCodeLine ("jsr boolult");
} else {
AddCodeLine ("cmp #$%02X", (unsigned char)val);
AddCodeLine ("jsr boolule");
}
} else {
if (val < 127) {
AddCodeLine ("cmp #$%02X", (unsigned char)val+1);
AddCodeLine ("jsr boollt");
} else {
AddCodeLine ("cmp #$%02X", (unsigned char)val);
AddCodeLine ("jsr boolle");
}
case CF_CHAR:
if (flags & CF_FORCECHAR) {
if (flags & CF_UNSIGNED) {
if (val < 255) {
AddCodeLine ("cmp #$%02X", (unsigned char)val+1);
AddCodeLine ("jsr boolult");
} else {
AddCodeLine ("cmp #$%02X", (unsigned char)val);
AddCodeLine ("jsr boolule");
}
} else {
if (val < 127) {
AddCodeLine ("cmp #$%02X", (unsigned char)val+1);
AddCodeLine ("jsr boollt");
} else {
AddCodeLine ("cmp #$%02X", (unsigned char)val);
AddCodeLine ("jsr boolle");
}
}
return;
}
@ -3595,7 +3595,7 @@ void g_le (unsigned flags, unsigned long val)
const char* Name = "boolule";
if (val < 65535) {
++val;
Name = "boolult";
Name = "boolult";
}
AddCodeLine ("cpx #$%02X", (unsigned char)(val >> 8));
AddCodeLine ("bne %s", LocalLabelName (L));
@ -3630,10 +3630,10 @@ void g_gt (unsigned flags, unsigned long val)
/* Test for greater than */
{
static char* ops [12] = {
"tosgt00", "tosgta0", "tosgtax",
"tosugt00", "tosugta0", "tosugtax",
0, 0, "tosgteax",
0, 0, "tosugteax",
"tosgt00", "tosgta0", "tosgtax",
"tosugt00", "tosugta0", "tosugtax",
0, 0, "tosgteax",
0, 0, "tosugteax",
};
@ -3642,46 +3642,65 @@ void g_gt (unsigned flags, unsigned long val)
*/
if (flags & CF_CONST) {
/* > is not very effective on the 6502, so try to convert
* it into >= if the value is in a valid range.
*/
/* Look at the type */
switch (flags & CF_TYPE) {
case CF_CHAR:
if (flags & CF_FORCECHAR) {
AddCodeLine ("cmp #$%02X", (unsigned char)val);
if (flags & CF_UNSIGNED) {
/* If we have a compare > 0, we will replace it by
* != 0 here, since both are identical but the latter
* is easier to optimize.
*/
if (val & 0xFF) {
AddCodeLine ("jsr boolugt");
} else {
AddCodeLine ("jsr boolne");
}
} else {
AddCodeLine ("jsr boolgt");
}
return;
}
/* FALLTHROUGH */
case CF_CHAR:
if (flags & CF_FORCECHAR) {
if (flags & CF_UNSIGNED) {
/* If we have a compare > 0, we will replace it by
* != 0 here, since both are identical but the latter
* is easier to optimize.
*/
if (val == 0) {
AddCodeLine ("cmp #$%02X", (unsigned char)val);
AddCodeLine ("jsr boolne");
} else if (val < 255) {
AddCodeLine ("cmp #$%02X", (unsigned char)val+1);
AddCodeLine ("jsr booluge");
} else {
AddCodeLine ("cmp #$%02X", (unsigned char)val);
AddCodeLine ("jsr boolugt");
}
} else {
if (val < 127) {
AddCodeLine ("cmp #$%02X", (unsigned char)val+1);
AddCodeLine ("jsr boolge");
} else {
AddCodeLine ("cmp #$%02X", (unsigned char)val);
AddCodeLine ("jsr boolgt");
}
}
return;
}
/* FALLTHROUGH */
case CF_INT:
if (flags & CF_UNSIGNED) {
/* If we have a compare > 0, we will replace it by
* != 0 here, since both are identical but the latter
* is easier to optimize.
case CF_INT:
if (flags & CF_UNSIGNED) {
/* If we have a compare > 0, we will replace it by
* != 0 here, since both are identical but the latter
* is easier to optimize.
*/
if ((val & 0xFFFF) == 0) {
AddCodeLine ("stx tmp1");
AddCodeLine ("ora tmp1");
AddCodeLine ("jsr boolne");
if (val == 0) {
AddCodeLine ("stx tmp1");
AddCodeLine ("ora tmp1");
AddCodeLine ("jsr boolne");
} else {
unsigned L = GetLocalLabel();
unsigned L = GetLocalLabel();
const char* Name = "boolugt";
if (val < 65535) {
++val;
Name = "booluge";
}
AddCodeLine ("cpx #$%02X", (unsigned char)(val >> 8));
AddCodeLine ("bne %s", LocalLabelName (L));
AddCodeLine ("cmp #$%02X", (unsigned char)val);
g_defcodelabel (L);
AddCodeLine ("jsr boolugt");
AddCodeLine ("bne %s", LocalLabelName (L));
AddCodeLine ("cmp #$%02X", (unsigned char)val);
g_defcodelabel (L);
AddCodeLine ("jsr %s", Name);
}
return;
}