-ffast-math -march=pentiumpro i386 fix

[Jan Hubicka]

Hi
Current CVS crashes when compiling byte benchmark with -O3 -march=pentiumpro
-ffast-math.  The purpose is that fcomi instruction is selected for compares
with memory operands.

Thu Apr 27 23:03:48 CEST 2000  Jan Hubicka  <jh@suse.cz>

	* i386.c (ix86_use_fcomi_compare): Make global.
	* i386-protos.h (ix86_use_fcomi_compare): Declare.
	* i386.md (fp comparison pattern): Use ix86_use_fcomi_compare.

*** i386.c.old	Thu Apr 27 22:59:36 2000
--- i386.c	Thu Apr 27 23:00:26 2000
*************** static void put_condition_code PARAMS ((
*** 392,398 ****
  static enum rtx_code unsigned_comparison PARAMS ((enum rtx_code code));
  static rtx ix86_expand_int_compare PARAMS ((enum rtx_code, rtx, rtx));
  static enum machine_mode ix86_fp_compare_mode PARAMS ((enum rtx_code));
- static int ix86_use_fcomi_compare PARAMS ((enum rtx_code));
  static enum rtx_code ix86_prepare_fp_compare_args PARAMS ((enum rtx_code,
  							   rtx *, rtx *));
  static rtx ix86_expand_compare PARAMS ((enum rtx_code));
--- 392,397 ----
*************** ix86_fp_compare_mode (code)
*** 4481,4487 ****
  
  /* Return true if we should use an FCOMI instruction for this fp comparison.  */
  
! static int
  ix86_use_fcomi_compare (code)
       enum rtx_code code;
  {
--- 4480,4486 ----
  
  /* Return true if we should use an FCOMI instruction for this fp comparison.  */
  
! int
  ix86_use_fcomi_compare (code)
       enum rtx_code code;
  {
*** i386-protos.h.old	Thu Apr 27 22:59:41 2000
--- i386-protos.h	Thu Apr 27 23:00:19 2000
*************** extern void ix86_split_ashldi PARAMS ((r
*** 108,113 ****
--- 108,114 ----
  extern void ix86_split_ashrdi PARAMS ((rtx *, rtx));
  extern void ix86_split_lshrdi PARAMS ((rtx *, rtx));
  extern void ix86_expand_strlensi_unroll_1 PARAMS ((rtx, rtx, rtx));
+ extern int ix86_use_fcomi_compare PARAMS ((enum rtx_code));
  
  extern rtx assign_386_stack_local PARAMS ((enum machine_mode, int));
  extern int ix86_attr_length_default PARAMS ((rtx));
*** i386.md.old	Thu Apr 27 23:03:31 2000
--- i386.md	Thu Apr 27 23:02:04 2000
***************
*** 7153,7159 ****
     (clobber (match_scratch:HI 4 "=a"))]
    "TARGET_80387
     && (GET_MODE (operands[1]) == SFmode || GET_MODE (operands[1]) == DFmode)
!    && GET_MODE (operands[1]) == GET_MODE (operands[2])"
    "#")
  
  (define_insn "*fp_jcc_4"
--- 7153,7160 ----
     (clobber (match_scratch:HI 4 "=a"))]
    "TARGET_80387
     && (GET_MODE (operands[1]) == SFmode || GET_MODE (operands[1]) == DFmode)
!    && GET_MODE (operands[1]) == GET_MODE (operands[2])
!    && !ix86_use_fcomi_compare (GET_CODE (operands[0]))"
    "#")
  
  (define_insn "*fp_jcc_4"
***************
*** 7168,7174 ****
     (clobber (match_scratch:HI 4 "=a"))]
    "TARGET_80387
     && (GET_MODE (operands[1]) == SFmode || GET_MODE (operands[1]) == DFmode)
!    && GET_MODE (operands[1]) == GET_MODE (operands[2])"
    "#")
  
  (define_insn "*fp_jcc_5"
--- 7169,7176 ----
     (clobber (match_scratch:HI 4 "=a"))]
    "TARGET_80387
     && (GET_MODE (operands[1]) == SFmode || GET_MODE (operands[1]) == DFmode)
!    && GET_MODE (operands[1]) == GET_MODE (operands[2])
!    && !ix86_use_fcomi_compare (GET_CODE (operands[0]))"
    "#")
  
  (define_insn "*fp_jcc_5"