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Check for shift count zero
git-svn-id: svn://svn.cc65.org/cc65/trunk@1055 b7a2c559-68d2-44c3-8de9-860c34a00d81
This commit is contained in:
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03229b3253
commit
43530d1604
@ -2785,7 +2785,7 @@ void g_and (unsigned flags, unsigned long val)
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AddCodeLine ("tax");
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AddCodeLine ("tax");
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AddCodeLine ("tya");
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AddCodeLine ("tya");
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if ((val & 0x00FF) != 0x00FF) {
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if ((val & 0x00FF) != 0x00FF) {
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AddCodeLine ("and #$%02X", (unsigned char)val);
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AddCodeLine ("and #$%02X", (unsigned char)val);
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}
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}
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}
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}
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}
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}
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@ -2829,10 +2829,10 @@ void g_asr (unsigned flags, unsigned long val)
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/* Primary = TOS >> Primary */
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/* Primary = TOS >> Primary */
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{
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{
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static char* ops [12] = {
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static char* ops [12] = {
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0, "tosasra0", "tosasrax",
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0, "tosasra0", "tosasrax",
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0, "tosshra0", "tosshrax",
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0, "tosshra0", "tosshrax",
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0, 0, "tosasreax",
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0, 0, "tosasreax",
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0, 0, "tosshreax",
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0, 0, "tosshreax",
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};
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};
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/* If the right hand side is const, the lhs is not on stack but still
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/* If the right hand side is const, the lhs is not on stack but still
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@ -2848,12 +2848,11 @@ void g_asr (unsigned flags, unsigned long val)
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AddCodeLine ("txa");
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AddCodeLine ("txa");
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ldxconst (0);
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ldxconst (0);
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val -= 8;
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val -= 8;
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if (val == 0) {
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/* Done */
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return;
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}
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}
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}
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if (val >= 1 && val <= 4) {
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if (val == 0) {
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/* Done */
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return;
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} else if (val >= 1 && val <= 4) {
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if (flags & CF_UNSIGNED) {
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if (flags & CF_UNSIGNED) {
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AddCodeLine ("jsr shrax%ld", val);
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AddCodeLine ("jsr shrax%ld", val);
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} else {
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} else {
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@ -2864,7 +2863,10 @@ void g_asr (unsigned flags, unsigned long val)
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break;
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break;
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case CF_LONG:
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case CF_LONG:
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if (val >= 1 && val <= 4) {
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if (val == 0) {
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/* Nothing to do */
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return;
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} else if (val >= 1 && val <= 4) {
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if (flags & CF_UNSIGNED) {
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if (flags & CF_UNSIGNED) {
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AddCodeLine ("jsr shreax%ld", val);
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AddCodeLine ("jsr shreax%ld", val);
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} else {
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} else {
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@ -2883,10 +2885,10 @@ void g_asr (unsigned flags, unsigned long val)
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AddCodeLine ("ldy #$00");
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AddCodeLine ("ldy #$00");
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AddCodeLine ("ldx sreg+1");
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AddCodeLine ("ldx sreg+1");
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if ((flags & CF_UNSIGNED) == 0) {
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if ((flags & CF_UNSIGNED) == 0) {
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unsigned L = GetLocalLabel();
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unsigned L = GetLocalLabel();
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AddCodeLine ("bpl %s", LocalLabelName (L));
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AddCodeLine ("bpl %s", LocalLabelName (L));
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AddCodeLine ("dey");
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AddCodeLine ("dey");
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g_defcodelabel (L);
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g_defcodelabel (L);
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}
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}
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AddCodeLine ("lda sreg");
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AddCodeLine ("lda sreg");
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AddCodeLine ("sty sreg+1");
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AddCodeLine ("sty sreg+1");
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@ -2901,8 +2903,8 @@ void g_asr (unsigned flags, unsigned long val)
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/* If we go here, we didn't emit code. Push the lhs on stack and fall
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/* If we go here, we didn't emit code. Push the lhs on stack and fall
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* into the normal, non-optimized stuff.
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* into the normal, non-optimized stuff.
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*/
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*/
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g_push (flags & ~CF_CONST, 0);
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g_push (flags & ~CF_CONST, 0);
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}
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}
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@ -2916,10 +2918,10 @@ void g_asl (unsigned flags, unsigned long val)
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/* Primary = TOS << Primary */
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/* Primary = TOS << Primary */
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{
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{
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static char* ops [12] = {
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static char* ops [12] = {
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0, "tosasla0", "tosaslax",
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0, "tosasla0", "tosaslax",
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0, "tosshla0", "tosshlax",
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0, "tosshla0", "tosshlax",
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0, 0, "tosasleax",
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0, 0, "tosasleax",
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0, 0, "tosshleax",
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0, 0, "tosshleax",
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};
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};
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@ -2936,23 +2938,25 @@ void g_asl (unsigned flags, unsigned long val)
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AddCodeLine ("tax");
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AddCodeLine ("tax");
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AddCodeLine ("lda #$00");
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AddCodeLine ("lda #$00");
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val -= 8;
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val -= 8;
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if (val == 0) {
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/* Done */
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return;
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}
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}
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}
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if (val >= 1 && val <= 4) {
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if (val == 0) {
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/* Done */
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return;
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} else if (val >= 1 && val <= 4) {
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if (flags & CF_UNSIGNED) {
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if (flags & CF_UNSIGNED) {
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AddCodeLine ("jsr shlax%ld", val);
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AddCodeLine ("jsr shlax%ld", val);
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} else {
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} else {
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AddCodeLine ("jsr aslax%ld", val);
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AddCodeLine ("jsr aslax%ld", val);
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}
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}
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return;
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return;
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}
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}
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break;
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break;
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case CF_LONG:
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case CF_LONG:
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if (val >= 1 && val <= 4) {
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if (val == 0) {
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/* Nothing to do */
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return;
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} else if (val >= 1 && val <= 4) {
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if (flags & CF_UNSIGNED) {
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if (flags & CF_UNSIGNED) {
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AddCodeLine ("jsr shleax%ld", val);
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AddCodeLine ("jsr shleax%ld", val);
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} else {
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} else {
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