2001-08-29 Kazu Hirata <kazu@hxi.com>
+ * h8300.md (movsi_h8300hs): Optimize loading of several
+ special constants.
+
+2001-08-29 Kazu Hirata <kazu@hxi.com>
+
* config/h8300/lib1funcs.asm: Fix comment typos.
2001-08-29 Kaveh R. Ghazi <ghazi@caip.rutgers.edu>
return \"sub.l\\t%S0,%S0\;add.b\\t%1,%x0\";
}
- /* Now look for small negative numbers. We can subtract them
- from zero to get the desired constant. */
- if (val == -4 || val == -2 || val == -1)
+ /* Look for constants that can be obtained by subs, inc, and
+ dec to 0. */
+ switch (val)
{
- operands[1] = GEN_INT (-INTVAL (operands[1]));
- return \"sub.l\\t%S0,%S0\;subs\\t%1,%S0\";
+ case 0xffffffff:
+ return \"sub.l\\t%S0,%S0\;subs\\t#1,%S0\";
+ case 0xfffffffe:
+ return \"sub.l\\t%S0,%S0\;subs\\t#2,%S0\";
+ case 0xfffffffc:
+ return \"sub.l\\t%S0,%S0\;subs\\t#4,%S0\";
+
+ case 0x0000ffff:
+ return \"sub.l\\t%S0,%S0\;dec.w\\t#1,%f0\";
+ case 0x0000fffe:
+ return \"sub.l\\t%S0,%S0\;dec.w\\t#2,%f0\";
+
+ case 0xffff0000:
+ return \"sub.l\\t%S0,%S0\;dec.w\\t#1,%e0\";
+ case 0xfffe0000:
+ return \"sub.l\\t%S0,%S0\;dec.w\\t#2,%e0\";
+
+ case 0x00010000:
+ return \"sub.l\\t%S0,%S0\;inc.w\\t#1,%e0\";
+ case 0x00020000:
+ return \"sub.l\\t%S0,%S0\;inc.w\\t#2,%e0\";
}
}
}