fix alphaev56 bootstrap

[Richard Henderson <rth at redhat dot com>]

A (return) pattern categorized as an integer branch instruction, which
triggers the test in the ev5 ilogcmp->ibr bypass.  But a return isn't
single_set so we aborted.

Rewritten to be more lenient in what we accept for this test.


r~


        * recog.c (if_test_bypass_p): Accept multiple set insns for OUT,
        and any jump or call for IN.

Index: recog.c
===================================================================
RCS file: /cvs/gcc/gcc/gcc/recog.c,v
retrieving revision 1.149
diff -c -p -d -r1.149 recog.c
*** recog.c	5 May 2002 21:51:04 -0000	1.149
--- recog.c	6 May 2002 20:05:53 -0000
*************** store_data_bypass_p (out_insn, in_insn)
*** 3329,3337 ****
    return true;
  }
  
! /* True if the dependency between OUT_INSN and IN_INSN is in the 
!    IF_THEN_ELSE condition, and not the THEN or ELSE branch.
!    Both OUT_INSN and IN_INSN must be single_set.  */
  
  int
  if_test_bypass_p (out_insn, in_insn)
--- 3329,3338 ----
    return true;
  }
  
! /* True if the dependency between OUT_INSN and IN_INSN is in the IF_THEN_ELSE
!    condition, and not the THEN or ELSE branch.  OUT_INSN may be either a single
!    or multiple set; IN_INSN should be single_set for truth, but for convenience
!    of insn categorization may be any JUMP or CALL insn.  */
  
  int
  if_test_bypass_p (out_insn, in_insn)
*************** if_test_bypass_p (out_insn, in_insn)
*** 3339,3358 ****
  {
    rtx out_set, in_set;
  
-   out_set = single_set (out_insn);
-   if (! out_set)
-     abort ();
- 
    in_set = single_set (in_insn);
    if (! in_set)
!     abort ();
  
    if (GET_CODE (SET_SRC (in_set)) != IF_THEN_ELSE)
      return false;
  
!   if (reg_mentioned_p (SET_DEST (out_set), XEXP (in_set, 1))
!       || reg_mentioned_p (SET_DEST (out_set), XEXP (in_set, 2)))
!     return false;
  
    return true;
  }
--- 3340,3388 ----
  {
    rtx out_set, in_set;
  
    in_set = single_set (in_insn);
    if (! in_set)
!     {
!       if (GET_CODE (in_insn) == JUMP_INSN || GET_CODE (in_insn) == CALL_INSN)
! 	return false;
!       abort ();
!     }
  
    if (GET_CODE (SET_SRC (in_set)) != IF_THEN_ELSE)
      return false;
+   in_set = SET_SRC (in_set);
  
!   out_set = single_set (out_insn);
!   if (out_set)
!     {
!       if (reg_mentioned_p (SET_DEST (out_set), XEXP (in_set, 1))
! 	  || reg_mentioned_p (SET_DEST (out_set), XEXP (in_set, 2)))
!         return false;
!     }
!   else
!     {
!       rtx out_pat;
!       int i;
! 
!       out_pat = PATTERN (out_insn);
!       if (GET_CODE (out_pat) != PARALLEL)
! 	abort ();
! 
!       for (i = 0; i < XVECLEN (out_pat, 0); i++)
! 	{
! 	  rtx exp = XVECEXP (out_pat, 0, i);
! 
! 	  if (GET_CODE (exp) == CLOBBER)
! 	    continue;
! 
! 	  if (GET_CODE (exp) != SET)
! 	    abort ();
! 
! 	  if (reg_mentioned_p (SET_DEST (out_set), XEXP (in_set, 1))
! 	      || reg_mentioned_p (SET_DEST (out_set), XEXP (in_set, 2)))
! 	    return false;
! 	}
!     }
  
    return true;
  }