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combine.c (expand_compound_operation): Make sure that zero_extend operation is profitable.

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2003-05-15 Eric Christopher <echristo@redhat.com>

        * combine.c (expand_compound_operation): Make sure
        that zero_extend operation is profitable.

From-SVN: r66853
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Eric Christopher 2003-05-16 02:05:29 +00:00 committed by Eric Christopher
parent c1fefa090b
commit 3dcd7d4595
2 changed files with 14 additions and 1 deletions
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gcc/ChangeLog
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@ -1,3 +1,8 @@
2003-05-15 Eric Christopher <echristo@redhat.com>
* combine.c (expand_compound_operation): Make sure
that zero_extend operation is profitable.
2003-05-15 Richard Henderson <rth@redhat.com>
* config/alpha/linux.h, config/alpha/linux-elf.h: Remove

10
gcc/combine.c
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@ -5802,7 +5802,15 @@ expand_compound_operation (x)
== 0)))
{
rtx temp = gen_rtx_ZERO_EXTEND (GET_MODE (x), XEXP (x, 0));
return expand_compound_operation (temp);
rtx temp2 = expand_compound_operation (temp);
/* Make sure this is a profitable operation. */
if (rtx_cost (x, SET) > rtx_cost (temp2, SET))
return temp2;
else if (rtx_cost (x, SET) > rtx_cost (temp, SET))
return temp;
else
return x;
}
/* We can optimize some special cases of ZERO_EXTEND. */