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Added SBC optimizations suggested by Piotr Fusik
git-svn-id: svn://svn.cc65.org/cc65/trunk@1123 b7a2c559-68d2-44c3-8de9-860c34a00d81
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@ -1749,10 +1749,9 @@ void g_subeqstatic (unsigned flags, unsigned long label, long offs,
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AddCodeLine ("sta %s", lbuf);
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}
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} else {
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AddCodeLine ("eor #$FF");
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AddCodeLine ("sec");
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AddCodeLine ("sta tmp1");
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AddCodeLine ("lda %s", lbuf);
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AddCodeLine ("sbc tmp1");
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AddCodeLine ("adc %s", lbuf);
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AddCodeLine ("sta %s", lbuf);
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}
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if ((flags & CF_UNSIGNED) == 0) {
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@ -1785,13 +1784,12 @@ void g_subeqstatic (unsigned flags, unsigned long label, long offs,
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AddCodeLine ("lda %s", lbuf);
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}
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} else {
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AddCodeLine ("sta tmp1");
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AddCodeLine ("lda %s", lbuf);
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AddCodeLine ("sbc tmp1");
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AddCodeLine ("eor #$FF");
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AddCodeLine ("adc %s", lbuf);
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AddCodeLine ("sta %s", lbuf);
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AddCodeLine ("stx tmp1");
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AddCodeLine ("lda %s+1", lbuf);
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AddCodeLine ("sbc tmp1");
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AddCodeLine ("txa");
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AddCodeLine ("eor #$FF");
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AddCodeLine ("adc %s+1", lbuf);
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AddCodeLine ("sta %s+1", lbuf);
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AddCodeLine ("tax");
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AddCodeLine ("lda %s", lbuf);
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@ -1845,9 +1843,8 @@ void g_subeqlocal (unsigned flags, int offs, unsigned long val)
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AddCodeLine ("lda (sp),y");
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AddCodeLine ("sbc #$%02X", (unsigned char)val);
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} else {
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AddCodeLine ("sta tmp1");
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AddCodeLine ("lda (sp),y");
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AddCodeLine ("sbc tmp1");
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AddCodeLine ("eor #$FF");
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AddCodeLine ("adc (sp),y");
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}
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AddCodeLine ("sta (sp),y");
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if ((flags & CF_UNSIGNED) == 0) {
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