[committed] Patch to fix mips execute/980605-1.c failures

[Richard Sandiford <rsandifo at redhat dot com>]

I've installed this patch to fix the execute/980605-1.c failures on
mips-sgi-irix6.5 and mips64-linux-gnu.  In my earlier reloc patch,
I forgot to make $25 an operand to loadgp, so -frename-registers
decided to use $25 for something that was live before the loadgp.
Sorry for the breakage.

Tested on mips64{,el}-linux-gnu, installed as obvious.

Richard


	* config/mips/mips.md (loadgp): Take $25 as a second operand.
	* config/mips/mips.c (mips_expand_prologue): Modify accordingly.

Index: config/mips/mips.c
===================================================================
RCS file: /cvs/gcc/gcc/gcc/config/mips/mips.c,v
retrieving revision 1.340
diff -c -p -F^\([(a-zA-Z0-9_]\|#define\) -r1.340 mips.c
*** config/mips/mips.c	4 Nov 2003 22:13:27 -0000	1.340
--- config/mips/mips.c	5 Nov 2003 11:01:23 -0000
*************** mips_expand_prologue (void)
*** 6648,6658 ****
    /* If generating n32/n64 abicalls, emit the instructions to load $gp.  */
    if (TARGET_ABICALLS && TARGET_NEWABI && cfun->machine->global_pointer > 0)
      {
!       rtx addr, offset;
  
        addr = XEXP (DECL_RTL (current_function_decl), 0);
        offset = mips_unspec_address (addr, SYMBOL_GOTOFF_LOADGP);
!       emit_insn (gen_loadgp (offset));
        if (!TARGET_EXPLICIT_RELOCS)
  	emit_insn (gen_loadgp_blockage ());
      }
--- 6648,6659 ----
    /* If generating n32/n64 abicalls, emit the instructions to load $gp.  */
    if (TARGET_ABICALLS && TARGET_NEWABI && cfun->machine->global_pointer > 0)
      {
!       rtx addr, offset, incoming_address;
  
        addr = XEXP (DECL_RTL (current_function_decl), 0);
        offset = mips_unspec_address (addr, SYMBOL_GOTOFF_LOADGP);
!       incoming_address = gen_rtx_REG (Pmode, PIC_FUNCTION_ADDR_REGNUM);
!       emit_insn (gen_loadgp (offset, incoming_address));
        if (!TARGET_EXPLICIT_RELOCS)
  	emit_insn (gen_loadgp_blockage ());
      }
Index: config/mips/mips.md
===================================================================
RCS file: /cvs/gcc/gcc/gcc/config/mips/mips.md,v
retrieving revision 1.207
diff -c -p -F^\([(a-zA-Z0-9_]\|#define\) -r1.207 mips.md
*** config/mips/mips.md	4 Nov 2003 22:13:32 -0000	1.207
--- config/mips/mips.md	5 Nov 2003 11:01:24 -0000
*************** (define_insn "store_df_high"
*** 5123,5142 ****
     (set_attr "mode"	"SF")
     (set_attr "length"	"4")])
  
  (define_insn_and_split "loadgp"
!   [(unspec_volatile [(match_operand 0 "" "")] UNSPEC_LOADGP)]
    "TARGET_ABICALLS && TARGET_NEWABI"
    "#"
    ""
!   [(set (match_dup 1) (match_dup 2))
!    (set (match_dup 1) (match_dup 3))
!    (set (match_dup 1) (match_dup 4))]
  {
!   operands[1] = pic_offset_table_rtx;
!   operands[2] = gen_rtx_HIGH (Pmode, operands[0]);
!   operands[3] = gen_rtx_PLUS (Pmode, operands[1],
! 			      gen_rtx_REG (Pmode, PIC_FUNCTION_ADDR_REGNUM));
!   operands[4] = gen_rtx_LO_SUM (Pmode, operands[1], operands[0]);
  }
    [(set_attr "length" "12")])
  
--- 5123,5145 ----
     (set_attr "mode"	"SF")
     (set_attr "length"	"4")])
  
+ ;; Insn to initialize $gp for n32/n64 abicalls.  Operand 0 is the offset
+ ;; of _gp from the start of this function.  Operand 1 is the incoming
+ ;; function address.
  (define_insn_and_split "loadgp"
!   [(unspec_volatile [(match_operand 0 "" "")
! 		     (match_operand 1 "register_operand" "")] UNSPEC_LOADGP)]
    "TARGET_ABICALLS && TARGET_NEWABI"
    "#"
    ""
!   [(set (match_dup 2) (match_dup 3))
!    (set (match_dup 2) (match_dup 4))
!    (set (match_dup 2) (match_dup 5))]
  {
!   operands[2] = pic_offset_table_rtx;
!   operands[3] = gen_rtx_HIGH (Pmode, operands[0]);
!   operands[4] = gen_rtx_PLUS (Pmode, operands[2], operands[1]);
!   operands[5] = gen_rtx_LO_SUM (Pmode, operands[2], operands[0]);
  }
    [(set_attr "length" "12")])