i386.md

Mac OS X 10.4.9 for x86 Source Code gcc 实现源代码

{
  ix86_compare_op0 = operands[0];
  ix86_compare_op1 = operands[1];
  DONE;
})

;; FP compares, step 1:
;; Set the FP condition codes.
;;
;; CCFPmode	compare with exceptions
;; CCFPUmode	compare with no exceptions

;; We may not use "#" to split and emit these, since the REG_DEAD notes
;; used to manage the reg stack popping would not be preserved.

(define_insn "*cmpfp_0_sf"
  [(set (match_operand:HI 0 "register_operand" "=a")
	(unspec:HI
	  [(compare:CCFP
	     (match_operand:SF 1 "register_operand" "f")
	     (match_operand:SF 2 "const0_operand" "X"))]
	UNSPEC_FNSTSW))]
  "TARGET_80387"
  "* return output_fp_compare (insn, operands, 0, 0);"
  [(set_attr "type" "multi")
   (set_attr "mode" "SF")])

(define_insn "*cmpfp_0_df"
  [(set (match_operand:HI 0 "register_operand" "=a")
	(unspec:HI
	  [(compare:CCFP
	     (match_operand:DF 1 "register_operand" "f")
	     (match_operand:DF 2 "const0_operand" "X"))]
	UNSPEC_FNSTSW))]
  "TARGET_80387"
  "* return output_fp_compare (insn, operands, 0, 0);"
  [(set_attr "type" "multi")
   (set_attr "mode" "DF")])

(define_insn "*cmpfp_0_xf"
  [(set (match_operand:HI 0 "register_operand" "=a")
	(unspec:HI
	  [(compare:CCFP
	     (match_operand:XF 1 "register_operand" "f")
	     (match_operand:XF 2 "const0_operand" "X"))]
	UNSPEC_FNSTSW))]
  "TARGET_80387"
  "* return output_fp_compare (insn, operands, 0, 0);"
  [(set_attr "type" "multi")
   (set_attr "mode" "XF")])

(define_insn "*cmpfp_sf"
  [(set (match_operand:HI 0 "register_operand" "=a")
	(unspec:HI
	  [(compare:CCFP
	     (match_operand:SF 1 "register_operand" "f")
	     (match_operand:SF 2 "nonimmediate_operand" "fm"))]
	  UNSPEC_FNSTSW))]
  "TARGET_80387"
  "* return output_fp_compare (insn, operands, 0, 0);"
  [(set_attr "type" "multi")
   (set_attr "mode" "SF")])

(define_insn "*cmpfp_df"
  [(set (match_operand:HI 0 "register_operand" "=a")
	(unspec:HI
	  [(compare:CCFP
	     (match_operand:DF 1 "register_operand" "f")
	     (match_operand:DF 2 "nonimmediate_operand" "fm"))]
	  UNSPEC_FNSTSW))]
  "TARGET_80387"
  "* return output_fp_compare (insn, operands, 0, 0);"
  [(set_attr "type" "multi")
   (set_attr "mode" "DF")])

(define_insn "*cmpfp_xf"
  [(set (match_operand:HI 0 "register_operand" "=a")
	(unspec:HI
	  [(compare:CCFP
	     (match_operand:XF 1 "register_operand" "f")
	     (match_operand:XF 2 "register_operand" "f"))]
	  UNSPEC_FNSTSW))]
  "TARGET_80387"
  "* return output_fp_compare (insn, operands, 0, 0);"
  [(set_attr "type" "multi")
   (set_attr "mode" "XF")])

(define_insn "*cmpfp_u"
  [(set (match_operand:HI 0 "register_operand" "=a")
	(unspec:HI
	  [(compare:CCFPU
	     (match_operand 1 "register_operand" "f")
	     (match_operand 2 "register_operand" "f"))]
	  UNSPEC_FNSTSW))]
  "TARGET_80387
   && FLOAT_MODE_P (GET_MODE (operands[1]))
   && GET_MODE (operands[1]) == GET_MODE (operands[2])"
  "* return output_fp_compare (insn, operands, 0, 1);"
  [(set_attr "type" "multi")
   (set (attr "mode")
     (cond [(match_operand:SF 1 "" "")
	      (const_string "SF")
	    (match_operand:DF 1 "" "")
	      (const_string "DF")
	   ]
	   (const_string "XF")))])

(define_insn "*cmpfp_si"
  [(set (match_operand:HI 0 "register_operand" "=a")
	(unspec:HI
	  [(compare:CCFP
	     (match_operand 1 "register_operand" "f")
	     (match_operator 3 "float_operator"
	       [(match_operand:SI 2 "memory_operand" "m")]))]
	  UNSPEC_FNSTSW))]
  "TARGET_80387 && TARGET_USE_FIOP
   && FLOAT_MODE_P (GET_MODE (operands[1]))
   && (GET_MODE (operands [3]) == GET_MODE (operands[1]))"
  "* return output_fp_compare (insn, operands, 0, 0);"
  [(set_attr "type" "multi")
   (set_attr "fp_int_src" "true")
   (set_attr "mode" "SI")])

;; FP compares, step 2
;; Move the fpsw to ax.

(define_insn "x86_fnstsw_1"
  [(set (match_operand:HI 0 "register_operand" "=a")
	(unspec:HI [(reg:CCFP FPSR_REG)] UNSPEC_FNSTSW))]
  "TARGET_80387"
  "fnstsw\t%0"
  [(set_attr "length" "2")
   (set_attr "mode" "SI")
   (set_attr "unit" "i387")])

;; FP compares, step 3
;; Get ax into flags, general case.

(define_insn "x86_sahf_1"
  [(set (reg:CC FLAGS_REG)
	(unspec:CC [(match_operand:HI 0 "register_operand" "a")] UNSPEC_SAHF))]
  "!TARGET_64BIT"
  "sahf"
  [(set_attr "length" "1")
   (set_attr "athlon_decode" "vector")
   (set_attr "mode" "SI")])

;; Pentium Pro can do steps 1 through 3 in one go.

;; APPLE LOCAL begin 3501055 mainline candidate
(define_insn "*cmpfp_i_mixed"
  [(set (reg:CCFP FLAGS_REG)
	(compare:CCFP (match_operand 0 "register_operand" "f,x")
		      (match_operand 1 "nonimmediate_operand" "f,xm")))]
  "TARGET_MIX_SSE_I387
   && SSE_FLOAT_MODE_P (GET_MODE (operands[0]))
   && GET_MODE (operands[0]) == GET_MODE (operands[1])"
  "* return output_fp_compare (insn, operands, 1, 0);"
  [(set_attr "type" "fcmp,ssecomi")
   (set (attr "mode")
     (if_then_else (match_operand:SF 1 "" "")
        (const_string "SF")
        (const_string "DF")))
   (set_attr "athlon_decode" "vector")])
;; APPLE LOCAL end 3501055 mainline candidate

(define_insn "*cmpfp_i_sse"
  [(set (reg:CCFP FLAGS_REG)
	(compare:CCFP (match_operand 0 "register_operand" "x")
		      (match_operand 1 "nonimmediate_operand" "xm")))]
  "TARGET_SSE_MATH
   && SSE_FLOAT_MODE_P (GET_MODE (operands[0]))
   && GET_MODE (operands[0]) == GET_MODE (operands[1])"
  "* return output_fp_compare (insn, operands, 1, 0);"
  [(set_attr "type" "ssecomi")
   (set (attr "mode")
     (if_then_else (match_operand:SF 1 "" "")
        (const_string "SF")
        (const_string "DF")))
   (set_attr "athlon_decode" "vector")])

(define_insn "*cmpfp_i_i387"
  [(set (reg:CCFP FLAGS_REG)
	(compare:CCFP (match_operand 0 "register_operand" "f")
		      (match_operand 1 "register_operand" "f")))]
  "TARGET_80387 && TARGET_CMOVE
   && (!TARGET_SSE_MATH || !SSE_FLOAT_MODE_P (GET_MODE (operands[0])))
   && FLOAT_MODE_P (GET_MODE (operands[0]))
   && GET_MODE (operands[0]) == GET_MODE (operands[1])"
  "* return output_fp_compare (insn, operands, 1, 0);"
  [(set_attr "type" "fcmp")
   (set (attr "mode")
     (cond [(match_operand:SF 1 "" "")
	      (const_string "SF")
	    (match_operand:DF 1 "" "")
	      (const_string "DF")
	   ]
	   (const_string "XF")))
   (set_attr "athlon_decode" "vector")])

;; APPLE LOCAL begin 3501055 mainline candidate
(define_insn "*cmpfp_iu_mixed"
  [(set (reg:CCFPU FLAGS_REG)
	(compare:CCFPU (match_operand 0 "register_operand" "f,x")
		       (match_operand 1 "nonimmediate_operand" "f,xm")))]
  "TARGET_MIX_SSE_I387
   && SSE_FLOAT_MODE_P (GET_MODE (operands[0]))
   && GET_MODE (operands[0]) == GET_MODE (operands[1])"
  "* return output_fp_compare (insn, operands, 1, 1);"
  [(set_attr "type" "fcmp,ssecomi")
   (set (attr "mode")
     (if_then_else (match_operand:SF 1 "" "")
        (const_string "SF")
        (const_string "DF")))
   (set_attr "athlon_decode" "vector")])
;; APPLE LOCAL end 3501055 mainline candidate

(define_insn "*cmpfp_iu_sse"
  [(set (reg:CCFPU FLAGS_REG)
	(compare:CCFPU (match_operand 0 "register_operand" "x")
		       (match_operand 1 "nonimmediate_operand" "xm")))]
  "TARGET_SSE_MATH
   && SSE_FLOAT_MODE_P (GET_MODE (operands[0]))
   && GET_MODE (operands[0]) == GET_MODE (operands[1])"
  "* return output_fp_compare (insn, operands, 1, 1);"
  [(set_attr "type" "ssecomi")
   (set (attr "mode")
     (if_then_else (match_operand:SF 1 "" "")
        (const_string "SF")
        (const_string "DF")))
   (set_attr "athlon_decode" "vector")])

(define_insn "*cmpfp_iu_387"
  [(set (reg:CCFPU FLAGS_REG)
	(compare:CCFPU (match_operand 0 "register_operand" "f")
		       (match_operand 1 "register_operand" "f")))]
  "TARGET_80387 && TARGET_CMOVE
   && (!TARGET_SSE_MATH || !SSE_FLOAT_MODE_P (GET_MODE (operands[0])))
   && FLOAT_MODE_P (GET_MODE (operands[0]))
   && GET_MODE (operands[0]) == GET_MODE (operands[1])"
  "* return output_fp_compare (insn, operands, 1, 1);"
  [(set_attr "type" "fcmp")
   (set (attr "mode")
     (cond [(match_operand:SF 1 "" "")
	      (const_string "SF")
	    (match_operand:DF 1 "" "")
	      (const_string "DF")
	   ]
	   (const_string "XF")))
   (set_attr "athlon_decode" "vector")])

;; Move instructions.

;; General case of fullword move.

(define_expand "movsi"
  [(set (match_operand:SI 0 "nonimmediate_operand" "")
	(match_operand:SI 1 "general_operand" ""))]
  ""
  "ix86_expand_move (SImode, operands); DONE;")

;; Push/pop instructions.  They are separate since autoinc/dec is not a
;; general_operand.
;;
;; %%% We don't use a post-inc memory reference because x86 is not a 
;; general AUTO_INC_DEC host, which impacts how it is treated in flow.
;; Changing this impacts compiler performance on other non-AUTO_INC_DEC
;; targets without our curiosities, and it is just as easy to represent
;; this differently.

(define_insn "*pushsi2"
  [(set (match_operand:SI 0 "push_operand" "=<")
	(match_operand:SI 1 "general_no_elim_operand" "ri*m"))]
  "!TARGET_64BIT"
  "push{l}\t%1"
  [(set_attr "type" "push")
   (set_attr "mode" "SI")])

;; For 64BIT abi we always round up to 8 bytes.
(define_insn "*pushsi2_rex64"
  [(set (match_operand:SI 0 "push_operand" "=X")
	(match_operand:SI 1 "nonmemory_no_elim_operand" "ri"))]
  "TARGET_64BIT"
  "push{q}\t%q1"
  [(set_attr "type" "push")
   (set_attr "mode" "SI")])

(define_insn "*pushsi2_prologue"
  [(set (match_operand:SI 0 "push_operand" "=<")
	(match_operand:SI 1 "general_no_elim_operand" "ri*m"))
   (clobber (mem:BLK (scratch)))]
  "!TARGET_64BIT"
  "push{l}\t%1"
  [(set_attr "type" "push")
   (set_attr "mode" "SI")])

(define_insn "*popsi1_epilogue"
  [(set (match_operand:SI 0 "nonimmediate_operand" "=r*m")
	(mem:SI (reg:SI SP_REG)))
   (set (reg:SI SP_REG)
	(plus:SI (reg:SI SP_REG) (const_int 4)))
   (clobber (mem:BLK (scratch)))]
  "!TARGET_64BIT"
  "pop{l}\t%0"
  [(set_attr "type" "pop")
   (set_attr "mode" "SI")])

(define_insn "popsi1"
  [(set (match_operand:SI 0 "nonimmediate_operand" "=r*m")
	(mem:SI (reg:SI SP_REG)))
   (set (reg:SI SP_REG)
	(plus:SI (reg:SI SP_REG) (const_int 4)))]
  "!TARGET_64BIT"
  "pop{l}\t%0"
  [(set_attr "type" "pop")
   (set_attr "mode" "SI")])

(define_insn "*movsi_xor"
  [(set (match_operand:SI 0 "register_operand" "=r")
	(match_operand:SI 1 "const0_operand" "i"))
   (clobber (reg:CC FLAGS_REG))]
  "reload_completed && (!TARGET_USE_MOV0 || optimize_size)"
  "xor{l}\t{%0, %0|%0, %0}"
  [(set_attr "type" "alu1")
   (set_attr "mode" "SI")
   (set_attr "length_immediate" "0")])
 
(define_insn "*movsi_or"
  [(set (match_operand:SI 0 "register_operand" "=r")
	(match_operand:SI 1 "immediate_operand" "i"))
   (clobber (reg:CC FLAGS_REG))]
  "reload_completed
   && operands[1] == constm1_rtx
   && (TARGET_PENTIUM || optimize_size)"
{
  operands[1] = constm1_rtx;
  return "or{l}\t{%1, %0|%0, %1}";
}
  [(set_attr "type" "alu1")
   (set_attr "mode" "SI")
   (set_attr "length_immediate" "1")])

(define_insn "*movsi_1"
  [(set (match_operand:SI 0 "nonimmediate_operand"
			"=r  ,m  ,*y,*y,?rm,?*y,*x,*x,?r,m ,?*Y,*x")
	(match_operand:SI 1 "general_operand"
			"rinm,rin,C ,*y,*y ,rm ,C ,*x,*Y,*x,r  ,m "))]
  "!(MEM_P (operands[0]) && MEM_P (operands[1]))"
{
  switch (get_attr_type (insn))
    {
    case TYPE_SSELOG1:
      if (get_attr_mode (insn) == MODE_TI)
        return "pxor\t%0, %0";
      return "xorps\t%0, %0";

    case TYPE_SSEMOV:
      switch (get_attr_mode (insn))
	{
	case MODE_TI:
	  return "movdqa\t{%1, %0|%0, %1}";
	case MODE_V4SF:
	  return "movaps\t{%1, %0|%0, %1}";
	case MODE_SI:
          return "movd\t{%1, %0|%0, %1}";
	case MODE_SF:
          return "movss\t{%1, %0|%0, %1}";
	default:
	  gcc_unreachable ();
	}

    case TYPE_MMXADD:
      return "pxor\t%0, %0";

    case TYPE_MMXMOV:
      if (get_attr_mode (insn) == MODE_DI)
	return "movq\t{%1, %0|%0, %1}";
      return "movd\t{%1, %0|%0, %1}";

    case TYPE_LEA:
      return "lea{l}\t{%1, %0|%0, %1}";

    default:
      if (flag_pic && !LEGITIMATE_PIC_OPERAND_P (operands[1]))
	abort();
      return "mov{l}\t{%1, %0|%0, %1}";
    }
}
  [(set (attr "type")
     (cond [(eq_attr "alternative" "2")
	      (const_string "mmx")
	    (eq_attr "alternative" "3,4,5")
	      (const_string "mmxmov")
	    (eq_attr "alternative" "6")
	      (const_string "sselog1")
	    (eq_attr "alternative" "7,8,9,10,11")
	      (const_string "ssemov")
	    (and (ne (symbol_ref "flag_pic") (const_int 0))
		 (match_operand:SI 1 "symbolic_operand" ""))
	      (const_string "lea")
	   ]
	   (const_string "imov")))
   (set (attr "mode")
     (cond [(eq_attr "alternative" "2,3")
	      (const_string "DI")
	    (eq_attr "alternative" "6,7")
	      (if_then_else
	        (eq (symbol_ref "TARGET_SSE2") (const_int 0))
	        (const_string "V4SF")
	        (const_string "TI"))
	    (and (eq_attr "alternative" "8,9,10,11")
	         (eq (symbol_ref "TARGET_SSE2") (const_int 0)))
	      (const_string "SF")
	   ]
	   (const_string "SI")))])