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(can_combine_p): When SMALL_REGISTER_CLASSES is defined, avoid 

substituting a return register into I3.

From-SVN: r13006
This commit is contained in:
Richard Kenner 1996-10-23 10:48:36 -04:00
parent 02214a5c14
commit ecd4080946
1 changed files with 6 additions and 1 deletions
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7
gcc/combine.c
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@ -960,11 +960,16 @@ can_combine_p (insn, i3, pred, succ, pdest, psrc)
/* Don't extend the life of a hard register unless it is
user variable (if we have few registers) or it can't
fit into the desired register (meaning something special
is going on). */
is going on).
Also avoid substituting a return register into I3, because
reload can't handle a conflict with constraints of other
inputs. */
|| (REGNO (src) < FIRST_PSEUDO_REGISTER
&& (! HARD_REGNO_MODE_OK (REGNO (src), GET_MODE (src))
#ifdef SMALL_REGISTER_CLASSES
|| (! all_adjacent && ! REG_USERVAR_P (src))
|| (FUNCTION_VALUE_REGNO_P (REGNO (src))
&& ! REG_USERVAR_P (src))
#endif
))))
return 0;