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https://github.com/cc65/cc65.git
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Better code for compares
git-svn-id: svn://svn.cc65.org/cc65/trunk@1152 b7a2c559-68d2-44c3-8de9-860c34a00d81
This commit is contained in:
cuz
parent
b8c4dc9b06
commit
18b591e268
@ -3298,11 +3298,11 @@ void g_ne (unsigned flags, unsigned long val)
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/* FALLTHROUGH */
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case CF_INT:
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L = GetLocalLabel();
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L = GetLocalLabel();
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AddCodeLine ("cpx #$%02X", (unsigned char)(val >> 8));
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AddCodeLine ("bne %s", LocalLabelName (L));
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AddCodeLine ("cmp #$%02X", (unsigned char)val);
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g_defcodelabel (L);
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g_defcodelabel (L);
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AddCodeLine ("jsr boolne");
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return;
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@ -3364,23 +3364,9 @@ void g_lt (unsigned flags, unsigned long val)
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/* FALLTHROUGH */
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case CF_INT:
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if ((flags & CF_UNSIGNED) == 0 && val == 0) {
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/* If we have a signed compare against zero, we only need to
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* test the high byte.
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*/
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AddCodeLine ("txa");
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AddCodeLine ("jsr boollt");
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return;
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}
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if (flags & CF_UNSIGNED) {
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/* Unsigned compare */
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/* If the low byte is zero, we must only test the high
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* byte. Or, citing Piotr Fusik:
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* Another interpretation: the code is effectively:
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* if (ax >= 0xAB00) goto L2;
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* It's equivalent to:
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* if ((ax >> 8) >= 0xAB) goto L2;
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*/
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/* If the low byte is zero, we must only test the high byte */
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AddCodeLine ("cpx #$%02X", (unsigned char)(val >> 8));
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if ((val & 0xFF) != 0) {
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unsigned L = GetLocalLabel();
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@ -3389,16 +3375,20 @@ void g_lt (unsigned flags, unsigned long val)
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g_defcodelabel (L);
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}
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AddCodeLine ("jsr boolult");
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return;
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} else {
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/* Signed compare */
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if ((val & 0xFF) == 0) {
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AddCodeLine ("cpx #$%02X", (unsigned char)(val >> 8));
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AddCodeLine ("jsr boollt");
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return;
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/* Low byte is zero, just look at the high byte */
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AddCodeLine ("cpx #$%02X", (unsigned char)(val >> 8));
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} else {
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/* Subtract the two values */
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AddCodeLine ("cmp #$%02X", (unsigned char)val);
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AddCodeLine ("txa");
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AddCodeLine ("sbc #$%02X", (unsigned char)(val >> 8));
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}
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AddCodeLine ("jsr boollt");
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}
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break;
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return;
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case CF_LONG:
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if ((flags & CF_UNSIGNED) == 0 && val == 0) {
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@ -3406,10 +3396,25 @@ void g_lt (unsigned flags, unsigned long val)
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* test the high byte.
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*/
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AddCodeLine ("lda sreg+1");
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AddCodeLine ("jsr boollt");
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return;
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} else {
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/* Do a subtraction */
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AddCodeLine ("cmp #$%02X", (unsigned char)val);
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AddCodeLine ("txa");
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AddCodeLine ("sbc #$%02X", (unsigned char)(val >> 8));
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AddCodeLine ("lda sreg");
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AddCodeLine ("sbc #$%02X", (unsigned char)(val >> 16));
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AddCodeLine ("lda sreg+1");
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AddCodeLine ("sbc #$%02X", (unsigned char)(val >> 24));
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}
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break;
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/* Emit the proper makebool routine */
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if (flags & CF_UNSIGNED) {
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/* Unsigned compare */
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AddCodeLine ("jsr boolult");
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} else {
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/* Signed compare */
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AddCodeLine ("jsr boollt");
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}
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return;
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default:
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typeerror (flags);
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@ -3451,27 +3456,27 @@ void g_le (unsigned flags, unsigned long val)
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if (flags & CF_FORCECHAR) {
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if (flags & CF_UNSIGNED) {
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/* Unsigned compare */
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if (val < 255) {
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if (val < 0xFF) {
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/* Use < instead of <= because the former gives
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* better code on the 6502 than the latter.
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*/
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AddCodeLine ("cmp #$%02X", (unsigned char)(val+1));
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AddCodeLine ("jsr boolult");
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g_lt (flags, val+1);
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} else {
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AddCodeLine ("cmp #$%02X", (unsigned char)val);
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AddCodeLine ("jsr boolule");
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/* Always true */
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Warning ("Condition is always true");
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AddCodeLine ("jsr return1");
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}
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} else {
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/* Signed compare */
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if (val < 127) {
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if (val < 0x7F) {
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/* Use < instead of <= because the former gives
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* better code on the 6502 than the latter.
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*/
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AddCodeLine ("cmp #$%02X", (unsigned char)(val+1));
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AddCodeLine ("jsr boollt");
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g_lt (flags, val+1);
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} else {
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AddCodeLine ("cmp #$%02X", (unsigned char)val);
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AddCodeLine ("jsr boolle");
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/* Always true */
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Warning ("Condition is always true");
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AddCodeLine ("jsr return1");
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}
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}
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return;
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@ -3481,31 +3486,52 @@ void g_le (unsigned flags, unsigned long val)
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case CF_INT:
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if (flags & CF_UNSIGNED) {
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/* Unsigned compare */
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if (val < 65535) {
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if (val < 0xFFFF) {
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/* Use < instead of <= because the former gives
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* better code on the 6502 than the latter.
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*/
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g_lt (flags, val+1);
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} else {
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unsigned L = GetLocalLabel();
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AddCodeLine ("cpx #$%02X", (unsigned char)(val >> 8));
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AddCodeLine ("bne %s", LocalLabelName (L));
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AddCodeLine ("cmp #$%02X", (unsigned char)val);
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g_defcodelabel (L);
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AddCodeLine ("jsr %s", "boolule");
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/* Always true */
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Warning ("Condition is always true");
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AddCodeLine ("jsr return1");
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}
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return;
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} else {
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/* Signed compare */
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if (val < 32767) {
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if (val < 0x7FFF) {
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g_lt (flags, val+1);
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return;
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}
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} else {
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/* Always true */
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Warning ("Condition is always true");
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AddCodeLine ("jsr return1");
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}
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}
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break;
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return;
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case CF_LONG:
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break;
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if (flags & CF_UNSIGNED) {
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/* Unsigned compare */
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if (val < 0xFFFFFFFF) {
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/* Use < instead of <= because the former gives
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* better code on the 6502 than the latter.
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*/
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g_lt (flags, val+1);
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} else {
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/* Always true */
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Warning ("Condition is always true");
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AddCodeLine ("jsr return1");
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}
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} else {
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/* Signed compare */
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if (val < 0x7FFFFFFF) {
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g_lt (flags, val+1);
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} else {
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/* Always true */
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Warning ("Condition is always true");
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AddCodeLine ("jsr return1");
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}
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}
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return;
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default:
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typeerror (flags);
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@ -3551,28 +3577,27 @@ void g_gt (unsigned flags, unsigned long val)
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* != 0 here, since both are identical but the
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* latter is easier to optimize.
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*/
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AddCodeLine ("cmp #$%02X", (unsigned char)val);
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AddCodeLine ("jsr boolne");
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} else if (val < 255) {
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g_ne (flags, val);
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} else if (val < 0xFF) {
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/* Use >= instead of > because the former gives
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* better code on the 6502 than the latter.
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*/
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AddCodeLine ("cmp #$%02X", (unsigned char)(val+1));
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AddCodeLine ("jsr booluge");
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g_ge (flags, val+1);
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} else {
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AddCodeLine ("cmp #$%02X", (unsigned char)val);
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AddCodeLine ("jsr boolugt");
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}
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/* Never true */
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Warning ("Condition is never true");
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AddCodeLine ("jsr return0");
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}
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} else {
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if (val < 127) {
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if (val < 0x7F) {
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/* Use >= instead of > because the former gives
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* better code on the 6502 than the latter.
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*/
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AddCodeLine ("cmp #$%02X", (unsigned char)(val+1));
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AddCodeLine ("jsr boolge");
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g_ge (flags, val+1);
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} else {
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AddCodeLine ("cmp #$%02X", (unsigned char)val);
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AddCodeLine ("jsr boolgt");
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/* Never true */
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Warning ("Condition is never true");
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AddCodeLine ("jsr return0");
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}
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}
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return;
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@ -3587,34 +3612,59 @@ void g_gt (unsigned flags, unsigned long val)
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* != 0 here, since both are identical but the latter
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* is easier to optimize.
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*/
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AddCodeLine ("stx tmp1");
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AddCodeLine ("ora tmp1");
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AddCodeLine ("jsr boolne");
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} else if (val < 65535U) {
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g_ne (flags, val);
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} else if (val < 0xFFFF) {
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/* Use >= instead of > because the former gives better
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* code on the 6502 than the latter.
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*/
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g_ge (flags, val+1);
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} else {
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unsigned L = GetLocalLabel();
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AddCodeLine ("cpx #$%02X", (unsigned char)(val >> 8));
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AddCodeLine ("bne %s", LocalLabelName (L));
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AddCodeLine ("cmp #$%02X", (unsigned char)val);
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g_defcodelabel (L);
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AddCodeLine ("jsr %s", "boolugt");
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/* Never true */
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Warning ("Condition is never true");
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AddCodeLine ("jsr return0");
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}
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return;
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} else {
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/* Signed compare */
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if (val < 32767) {
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if (val < 0x7FFF) {
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g_ge (flags, val+1);
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return;
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}
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} else {
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/* Never true */
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Warning ("Condition is never true");
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AddCodeLine ("jsr return0");
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}
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}
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break;
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return;
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case CF_LONG:
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break;
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if (flags & CF_UNSIGNED) {
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/* Unsigned compare */
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if (val == 0) {
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/* If we have a compare > 0, we will replace it by
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* != 0 here, since both are identical but the latter
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* is easier to optimize.
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*/
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g_ne (flags, val);
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} else if (val < 0xFFFFFFFF) {
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/* Use >= instead of > because the former gives better
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* code on the 6502 than the latter.
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*/
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g_ge (flags, val+1);
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} else {
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/* Never true */
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Warning ("Condition is never true");
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AddCodeLine ("jsr return0");
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}
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} else {
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/* Signed compare */
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if (val < 0x7FFFFFFF) {
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g_ge (flags, val+1);
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} else {
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/* Never true */
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Warning ("Condition is never true");
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AddCodeLine ("jsr return0");
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}
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}
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return;
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default:
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typeerror (flags);
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@ -3672,23 +3722,9 @@ void g_ge (unsigned flags, unsigned long val)
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/* FALLTHROUGH */
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case CF_INT:
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if ((flags & CF_UNSIGNED) == 0 && val == 0) {
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/* If we have a signed compare against zero, we only need to
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* test the high byte.
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*/
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AddCodeLine ("txa");
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AddCodeLine ("jsr boolge");
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return;
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}
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/* Direct code only for unsigned data types */
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if (flags & CF_UNSIGNED) {
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/* If the low byte is zero, we must only test the high
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* byte. Or, citing Piotr Fusik:
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* Another interpretation: the code is effectively:
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* if (ax >= 0xAB00) goto L2;
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* It's equivalent to:
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* if ((ax >> 8) >= 0xAB) goto L2;
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*/
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/* Unsigned compare */
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/* If the low byte is zero, we must only test the high byte */
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AddCodeLine ("cpx #$%02X", (unsigned char)(val >> 8));
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if ((val & 0xFF) != 0) {
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unsigned L = GetLocalLabel();
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@ -3697,16 +3733,20 @@ void g_ge (unsigned flags, unsigned long val)
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g_defcodelabel (L);
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}
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AddCodeLine ("jsr booluge");
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return;
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} else {
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/* Signed compare */
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if ((val & 0xFF) == 0) {
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AddCodeLine ("cpx #$%02X", (unsigned char) (val >> 8));
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AddCodeLine ("jsr boolge");
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return;
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/* Low byte is zero, just look at the high byte */
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AddCodeLine ("cpx #$%02X", (unsigned char)(val >> 8));
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} else {
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/* Subtract the two values */
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AddCodeLine ("cmp #$%02X", (unsigned char)val);
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AddCodeLine ("txa");
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AddCodeLine ("sbc #$%02X", (unsigned char)(val >> 8));
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}
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AddCodeLine ("jsr boolge");
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}
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break;
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return;
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case CF_LONG:
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if ((flags & CF_UNSIGNED) == 0 && val == 0) {
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@ -3714,10 +3754,25 @@ void g_ge (unsigned flags, unsigned long val)
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* test the high byte.
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*/
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AddCodeLine ("lda sreg+1");
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AddCodeLine ("jsr boolge");
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return;
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} else {
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/* Do a subtraction */
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AddCodeLine ("cmp #$%02X", (unsigned char)val);
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AddCodeLine ("txa");
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AddCodeLine ("sbc #$%02X", (unsigned char)(val >> 8));
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AddCodeLine ("lda sreg");
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AddCodeLine ("sbc #$%02X", (unsigned char)(val >> 16));
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AddCodeLine ("lda sreg+1");
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AddCodeLine ("sbc #$%02X", (unsigned char)(val >> 24));
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}
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break;
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/* Emit the proper makebool routine */
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if (flags & CF_UNSIGNED) {
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/* Unsigned compare */
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AddCodeLine ("jsr booluge");
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} else {
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/* Signed compare */
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AddCodeLine ("jsr boolge");
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}
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return;
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default:
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typeerror (flags);
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