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Added SBC optimizations suggested by Piotr Fusik

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git-svn-id: svn://svn.cc65.org/cc65/trunk@1123 b7a2c559-68d2-44c3-8de9-860c34a00d81
This commit is contained in:
cuz
2001-11-17 11:31:57 +00:00
parent b8facd7f1e
commit 2de4a26251
1 changed files with 16 additions and 19 deletions
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21
src/cc65/codegen.c
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@@ -1749,10 +1749,9 @@ void g_subeqstatic (unsigned flags, unsigned long label, long offs,
AddCodeLine ("sta %s", lbuf); AddCodeLine ("sta %s", lbuf);
} }
} else { } else {
AddCodeLine ("eor #$FF");
AddCodeLine ("sec"); AddCodeLine ("sec");
AddCodeLine ("sta tmp1"); AddCodeLine ("adc %s", lbuf);
AddCodeLine ("lda %s", lbuf);
AddCodeLine ("sbc tmp1");
AddCodeLine ("sta %s", lbuf); AddCodeLine ("sta %s", lbuf);
} }
if ((flags & CF_UNSIGNED) == 0) { if ((flags & CF_UNSIGNED) == 0) {
@@ -1785,13 +1784,12 @@ void g_subeqstatic (unsigned flags, unsigned long label, long offs,
AddCodeLine ("lda %s", lbuf); AddCodeLine ("lda %s", lbuf);
} }
} else { } else {
AddCodeLine ("sta tmp1"); AddCodeLine ("eor #$FF");
AddCodeLine ("lda %s", lbuf); AddCodeLine ("adc %s", lbuf);
AddCodeLine ("sbc tmp1");
AddCodeLine ("sta %s", lbuf); AddCodeLine ("sta %s", lbuf);
AddCodeLine ("stx tmp1"); AddCodeLine ("txa");
AddCodeLine ("lda %s+1", lbuf); AddCodeLine ("eor #$FF");
AddCodeLine ("sbc tmp1"); AddCodeLine ("adc %s+1", lbuf);
AddCodeLine ("sta %s+1", lbuf); AddCodeLine ("sta %s+1", lbuf);
AddCodeLine ("tax"); AddCodeLine ("tax");
AddCodeLine ("lda %s", lbuf); AddCodeLine ("lda %s", lbuf);
@@ -1845,9 +1843,8 @@ void g_subeqlocal (unsigned flags, int offs, unsigned long val)
AddCodeLine ("lda (sp),y"); AddCodeLine ("lda (sp),y");
AddCodeLine ("sbc #$%02X", (unsigned char)val); AddCodeLine ("sbc #$%02X", (unsigned char)val);
} else { } else {
AddCodeLine ("sta tmp1"); AddCodeLine ("eor #$FF");
AddCodeLine ("lda (sp),y"); AddCodeLine ("adc (sp),y");
AddCodeLine ("sbc tmp1");
} }
AddCodeLine ("sta (sp),y"); AddCodeLine ("sta (sp),y");
if ((flags & CF_UNSIGNED) == 0) { if ((flags & CF_UNSIGNED) == 0) {