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		     (with-empty-tn@fp-top(y)
		       (note-this-location vop :internal-error)
		       (inst fild temp)))
		    (signed-stack
		     (with-empty-tn@fp-top(y)
		       (note-this-location vop :internal-error)
		       (inst fild x))))))))
  (frob %single-float/signed %single-float single-reg single-float)
  (frob %double-float/signed %double-float double-reg double-float))

(macrolet ((frob (name translate to-sc to-type)
	     `(define-vop (,name)
		(:args (x :scs (unsigned-reg)))
		(:results (y :scs (,to-sc)))
		(:arg-types unsigned-num)
		(:result-types ,to-type)
		(:policy :fast-safe)
		(:note "inline float coercion")
		(:translate ,translate)
		(:vop-var vop)
		(:save-p :compute-only)
		(:generator 5
		 (inst push 0)
		 (inst push x)
		 (with-empty-tn@fp-top(y)
		   (note-this-location vop :internal-error)
		   (inst fildl (make-ea :dword :base esp-tn)))
		 (inst add esp-tn 8)))))
  (frob %single-float/unsigned %single-float single-reg single-float)
  (frob %double-float/unsigned %double-float double-reg double-float))
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;;; These should be no-ops but the compiler might want to move
;;; some things around
(macrolet ((frob (name translate from-sc from-type to-sc to-type)
	     `(define-vop (,name)
	       (:args (x :scs (,from-sc) :target y))
	       (:results (y :scs (,to-sc)))
	       (:arg-types ,from-type)
	       (:result-types ,to-type)
	       (:policy :fast-safe)
	       (:note "inline float coercion")
	       (:translate ,translate)
	       (:vop-var vop)
	       (:save-p :compute-only)
	       (:generator 2
		(note-this-location vop :internal-error)
		(unless (location= x y)
		  (cond 
		   ((zerop (tn-offset x))
		    ;; x is in ST0, y is in another reg. not ST0
		    (inst fst  y))
		   ((zerop (tn-offset y))
		    ;; y is in ST0, x is in another reg. not ST0
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		   (t
		    ;; Neither x or y are in ST0, and they are not in
		    ;; the same reg.
		    (inst fxch x)
		    (inst fst  y)
		    (inst fxch x))))))))
  
  (frob %single-float/double-float %single-float double-reg
	double-float single-reg single-float)
  (frob %double-float/single-float %double-float single-reg single-float
	double-reg double-float))



(macrolet ((frob (trans from-sc from-type round-p)
	     `(define-vop (,(symbolicate trans "/" from-type))
	       (:args (x :scs (,from-sc)))
	       (:temporary (:sc signed-stack) stack-temp)
	       ,@(unless round-p
		       '((:temporary (:sc unsigned-stack) scw)
			 (:temporary (:sc any-reg) rcw)))
	       (:results (y :scs (signed-reg)))
	       (:arg-types ,from-type)
	       (:result-types signed-num)
	       (:translate ,trans)
	       (:policy :fast-safe)
	       (:note "inline float truncate")
	       (:vop-var vop)
	       (:save-p :compute-only)
	       (:generator 5
		(note-this-location vop :internal-error)
		(inst wait) 		; Catch any pending FPE exceptions
		;; normal mode (for now) is "round to best"
		(with-tn@fp-top(x)
		  ,@(unless round-p
		    '((inst fnstcw scw)	; save current control word
		      (move rcw scw)	; into 16-bit register
		      (inst or rcw (ash #b11 10)) ; CHOP
		      (move stack-temp rcw)
		      (inst fldcw stack-temp)))
		  (sc-case y
		    (signed-stack
		     (inst fist y))
		    (signed-reg
		     (inst fist stack-temp)
		     (inst mov y stack-temp)))
		  ,@(unless round-p
		     '((inst fldcw scw))))))))
  
  (frob %unary-truncate single-reg single-float nil)
  (frob %unary-truncate double-reg double-float nil)

  #-sun4
  (frob %unary-round single-reg single-float t)
  #-sun4
  (frob %unary-round double-reg double-float t))

#+sun4
(deftransform %unary-round ((x) (float) (signed-byte 32))
  '(let* ((trunc (truly-the (signed-byte 32) (%unary-truncate x)))
	  (extra (- x trunc))
	  (absx (abs extra))
	  (one-half (float 1/2 x)))
     (if (if (oddp trunc)
	     (>= absx one-half)
	     (> absx one-half))
	 (truly-the (signed-byte 32) (%unary-truncate (+ x extra)))
	 trunc)))

(define-vop (make-single-float)
  (:args (bits :scs (signed-reg) :target res
	       :load-if (not (or (and (sc-is bits signed-stack)
				      (sc-is res single-reg))
				 (and (sc-is bits signed-stack)
				      (sc-is res single-stack)
				      (location= bits res))))))
  (:results (res :scs (single-reg single-stack)))
  (:temporary (:sc signed-stack) stack-temp)
  (:arg-types signed-num)
  (:result-types single-float)
  (:translate make-single-float)
  (:policy :fast-safe)
  (:vop-var vop)
  (:generator 4
    (sc-case res
       (single-stack
	(sc-case bits
	  (signed-reg
	   (inst mov res bits))
	  (signed-stack
	   (assert (location= bits res)))))
       (single-reg
	(sc-case bits
	  (signed-reg
	   ;; source must be in memory
	   (inst mov stack-temp bits)
	   (with-empty-tn@fp-top(res)
	      (inst fld stack-temp)))
	  (signed-stack
	   (with-empty-tn@fp-top(res)
	      (inst fld bits))))))))

(define-vop (make-double-float)
  (:args (hi-bits :scs (signed-reg))
	 (lo-bits :scs (unsigned-reg)))
  (:results (res :scs (double-reg)))
  (:temporary (:sc double-stack) temp)
  (:arg-types signed-num unsigned-num)
  (:result-types double-float)
  (:translate make-double-float)
  (:policy :fast-safe)
  (:vop-var vop)
  (:generator 2
    (let ((offset (1+ (tn-offset temp))))
      (storew hi-bits ebp-tn (- offset))
      (storew lo-bits ebp-tn (- (1+ offset)))
      (with-empty-tn@fp-top(res)
	(inst fldd (make-ea :dword :base ebp-tn
			    :disp (- (* (1+ offset) word-bytes))))))))

(define-vop (single-float-bits)
  (:args (float :scs (single-reg descriptor-reg)))
  (:results (bits :scs (signed-reg)))
  (:temporary (:sc signed-stack :from :argument :to :result) stack-temp)
  (:arg-types single-float)
  (:result-types signed-num)
  (:translate single-float-bits)
  (:policy :fast-safe)
  (:vop-var vop)
  (:generator 4
    (sc-case bits
      (signed-reg
       (sc-case float
	 (single-reg
	  (with-tn@fp-top(float)
	    (inst fst stack-temp)
	    (inst mov bits stack-temp)))
	 (single-stack
	  (inst mov bits float))
	 (descriptor-reg
	  (loadw
	   bits float vm:single-float-value-slot vm:other-pointer-type))))
      (signed-stack
       (sc-case float
	 (single-reg
	  (with-tn@fp-top(float)
	    (inst fst bits))))))))

;; must test
(define-vop (double-float-high-bits)
  (:args (float :scs (double-reg descriptor-reg)))
  (:results (hi-bits :scs (signed-reg)))
  (:temporary (:sc double-stack) temp)
  (:arg-types double-float)
  (:result-types signed-num)
  (:translate double-float-high-bits)
  (:policy :fast-safe)
  (:vop-var vop)
  (:generator 5
    (sc-case hi-bits
      (signed-reg
       (sc-case float
	 (double-reg
	  (with-tn@fp-top(float)
	    (let ((where (make-ea :dword :base ebp-tn
				  :disp (- (* (+ 2 (tn-offset temp))
					      word-bytes)))))
	      (inst fstd where)))
	  (loadw hi-bits ebp-tn (- (1+ (tn-offset temp)))))
	 (double-stack
	  (loadw hi-bits ebp-tn (- (1+ (tn-offset float)))))
	 (descriptor-reg
	  (loadw hi-bits float (1+ vm:double-float-value-slot)
		 vm:other-pointer-type))))
      #+nil ;; should not happen
      (signed-stack
       (sc-case float
	 (double-reg
	  (inst stf float (current-nfp-tn vop)
		(* (tn-offset hi-bits) vm:word-bytes))))))))

;;needs testing
(define-vop (double-float-low-bits)
  (:args (float :scs (double-reg descriptor-reg)))
  (:results (lo-bits :scs (unsigned-reg)))
  (:temporary (:sc double-stack) temp)
  (:arg-types double-float)
  (:result-types unsigned-num)
  (:translate double-float-low-bits)
  (:policy :fast-safe)
  (:vop-var vop)
  (:generator 5
    (sc-case lo-bits
      (unsigned-reg
       (sc-case float
	 (double-reg
	  (with-tn@fp-top(float)
	    (let ((where (make-ea :dword :base ebp-tn
				  :disp (- (* (+ 2 (tn-offset temp))
					      word-bytes)))))
	      (inst fstd where)))
	  (loadw lo-bits ebp-tn (- (+ 2 (tn-offset temp)))))
	 (double-stack
	  (loadw lo-bits ebp-tn (- (+ 2 (tn-offset float)))))
	 (descriptor-reg
	  (loadw lo-bits float  vm:double-float-value-slot
		 vm:other-pointer-type))))
      #+nil ;; should not happen
      (unsigned-stack
       (sc-case float
	 (double-reg
	  (inst stf-odd float (current-nfp-tn vop)
		(* (tn-offset lo-bits) vm:word-bytes))))))))


;;;; Float mode hackery:

(deftype float-modes () '(unsigned-byte 32)) ; really only 16
(defknown floating-point-modes () float-modes (flushable))
(defknown ((setf floating-point-modes)) (float-modes)
  float-modes)

(defconstant npx-env-size (* 7 vm:word-bytes))
(defconstant npx-cw-offset 0)
(defconstant npx-sw-offset 4)

(define-vop (floating-point-modes)
  (:results (res :scs (unsigned-reg)))
  (:result-types unsigned-num)
  (:translate floating-point-modes)
  (:policy :fast-safe)
  (:vop-var vop)
  (:temporary (:sc dword-reg :offset  eax-offset :target res)  eax)
  (:temporary (:sc dword-reg) tmp)
  (:generator 8
   (inst mov tmp esp-tn)		; save stack pointer
   (inst sub esp-tn npx-env-size)	; make space on stack
   (inst wait)                          ; Catch any pending FPE exceptions
   (inst fstenv (make-ea :dword :base esp-tn)) ; masks all exceptions
   (inst fldenv (make-ea :dword :base esp-tn)) ; restore previous state
   (inst mov ax-tn (make-ea :word :base esp-tn :disp npx-sw-offset))
   (inst shl eax 16)			; current status to high word
   (inst mov ax-tn (make-ea :word :base esp-tn :disp npx-cw-offset))
   (inst xor ax-tn #x3f)       ; turn exception mask to trap enable bits
   (inst mov esp-tn tmp)		; reset stack
   (move res eax)))

(define-vop (set-floating-point-modes)
  (:args (new :scs (unsigned-reg) :target res))
  (:results (res :scs (unsigned-reg)))
  (:arg-types unsigned-num)
  (:result-types unsigned-num)
  (:translate (setf floating-point-modes))
  (:policy :fast-safe)
  (:vop-var vop)
  (:temporary (:sc dword-reg :offset eax-offset) eax)
  (:temporary (:sc dword-reg) stmp)
  (:temporary (:sc dword-reg) wtmp)
  (:generator 3
   (inst mov stmp esp-tn)		; save stack pointer
   (inst sub esp-tn npx-env-size)	; make space on stack
   (inst wait)                          ; Catch any pending FPE exceptions
   (inst fstenv (make-ea :dword :base esp-tn))
   (inst mov ax-tn (make-ea :word :base esp-tn :disp npx-sw-offset))
   (move wtmp new)
   (inst shr wtmp 16)			; position sticky bits
   (inst and wtmp #x3f)
   (inst and eax wtmp)			; maybe new sticky bits
   (inst mov (make-ea :word :base esp-tn :disp npx-sw-offset) ax-tn)
   (move eax new)
   (inst xor eax #x3f)	    ; turn trap enable bits into exception mask
   (inst mov (make-ea :word :base esp-tn :disp npx-cw-offset) ax-tn)
   (inst fldenv (make-ea :dword :base esp-tn))
   (move esp-tn stmp)			; reset stack
   (move res new)))



;;; Lets use some of the 80387 special functions.
;;;
;;; These defs will not take effect unless code/irrat.lisp is modified
;;; to remove the inlined alien routine def.

(macrolet ((frob (func trans op)
	     `(define-vop (,func)
	       (:args (x :scs (double-reg) :target fr0))
	       (:temporary (:sc double-reg :offset fr0-offset
				:from :argument :to :result) fr0)
	       (:ignore fr0)
	       (:results (y :scs (double-reg)))
	       (:arg-types double-float)
	       (:result-types double-float)
	       (:translate ,trans)
	       (:policy :fast-safe)
	       (:note "inline NPX function")
	       (:vop-var vop)
	       (:save-p :compute-only)
	       (:node-var node)
	       (:generator 5
		(note-this-location vop :internal-error)
		(unless (zerop (tn-offset x))
		  (inst fxch x)		; x to top of stack
		  (unless (location= x y)
		    (inst fst x)))	; maybe save it
		(inst ,op)		; clobber st0
		(cond ((zerop (tn-offset y))
		       (when (policy node (or (= debug 3) (> safety speed)))
			     (inst wait)))
		      (t
		       (inst fst y)))))))

  (frob fsin-quick  %sin-quick fsin)		; arg range is 2^63
  (frob fcos-quick  %cos-quick fcos)		; so may need frem1
  (frob fsqrt %sqrt fsqrt))

;;; Versions of fsin and fcos which handle a larger arg. range.
(macrolet ((frob (func trans op)
	     `(define-vop (,func)
		(:translate ,trans)
		(:args (x :scs (double-reg) :target fr0))
		#+nil(:temporary (:sc word-reg :offset eax-offset
				 :from :eval :to :result) temp)
		(:temporary (:sc double-reg :offset fr0-offset
				 :from :argument :to :result) fr0)
		#+nil(:temporary (:sc double-reg :offset fr1-offset
				 :from :argument :to :result) fr1)
		(:results (y :scs (double-reg)))
		(:arg-types double-float)
		(:result-types double-float)
		(:policy :fast-safe)
		(:note "inline sin/cos function")
		(:vop-var vop)
		(:save-p :compute-only)
		#+nil(:ignore temp)
		(:generator 5
		  (note-this-location vop :internal-error)
		  (unless (zerop (tn-offset x))
			  (inst fxch x)		 ; x to top of stack
			  (unless (location= x y)
				  (inst fst x))) ; maybe save it
		  (inst ,op)
		  (inst fnstsw)			 ; status word to %ea
		  (inst and ah-tn #x04)		 ; C2
		  (inst jmp :z DONE)
		  ;; Else x was out of range so reduce it; ST0 is unchanged.
		  #+nil				; @@@
		  (progn			; Arg reduction is errorful
		    (inst fstp fr1) 		; Load 2*PI
		    (inst fldpi)
		    (inst fadd fr0)
		    (inst fxch fr1)
		    LOOP
		    (inst fprem1)
		    (inst fnstsw)		; status word to %ea
		    (inst and ah-tn #x04)	; C2
		    (inst jmp :nz LOOP)
		    (inst ,op))
		  (progn			; @@@
		    (inst fstp fr0)		; Else Load 0.0
		    (inst fldz))		; on too big args
		  DONE
		  (unless (zerop (tn-offset y))
			  (inst fstd y))))))
	  (frob fsin  %sin fsin)
	  (frob fcos  %cos fcos))
	     
(define-vop (ftan)
  (:translate %tan)
  (:args (x :scs (double-reg) :target fr0))
  #+nil(:temporary (:sc word-reg :offset eax-offset
		   :from :eval :to :result) temp)
  (:temporary (:sc double-reg :offset fr0-offset
		   :from :argument :to :result) fr0)
  (:temporary (:sc double-reg :offset fr1-offset
		   :from :argument :to :result) fr1)
  (:results (y :scs (double-reg)))
  (:arg-types double-float)
  (:result-types double-float)
  (:policy :fast-safe)
  (:note "inline tan function")
  (:vop-var vop)
  (:save-p :compute-only)
  #+nil(:ignore temp)
  (:generator 5
    (note-this-location vop :internal-error)
    (case (tn-offset x)
       (0 
	(inst fstp fr1))
       (1
	(inst fstp fr0))
       (t
	(inst fstp fr0)
	(inst fstp fr0)
	(inst fldd (make-random-tn :kind :normal
				   :sc (sc-or-lose 'double-reg)
				   :offset (- (tn-offset x) 2)))))
    (inst fptan)
    (inst fnstsw)			 ; status word to %ea
    (inst and ah-tn #x04)		 ; C2
    (inst jmp :z DONE)
    ;; Else x was out of range so reduce it; ST0 is unchanged.
    #+nil
    (progn				; @@@ Reduction doesn't work well.
      (inst fldpi)                         ; Load 2*PI
      (inst fadd fr0)
      (inst fxch fr1)
      LOOP
      (inst fprem1)
      (inst fnstsw)			 ; status word to %ea
      (inst and ah-tn #x04)		 ; C2
      (inst jmp :nz LOOP)
      (inst fstp fr1)
      (inst fptan))
    (progn				; @@@ just load 0.0 
      (inst fldz)
      (inst fxch fr1))
    DONE
    ;; Result is in fr1
    (case (tn-offset y)
       (0
	(inst fxch fr1))
       (1)
       (t
	(inst fxch fr1)
	(inst fstd y)))))

(define-vop (ftan-quick)
  (:translate %tan-quick)
  (:args (x :scs (double-reg) :target fr0))
  (:temporary (:sc double-reg :offset fr0-offset
		   :from :argument :to :result) fr0)
  (:temporary (:sc double-reg :offset fr1-offset
		   :from :argument :to :result) fr1)
  (:results (y :scs (double-reg)))
  (:arg-types double-float)
  (:result-types double-float)
  (:policy :fast-safe)
  (:note "inline tan function")
  (:vop-var vop)
  (:save-p :compute-only)
  (:generator 5
    (note-this-location vop :internal-error)
    (case (tn-offset x)
       (0 
	(inst fstp fr1))
       (1
	(inst fstp fr0))
       (t
	(inst fstp fr0)
	(inst fstp fr0)
	(inst fldd (make-random-tn :kind :normal
				   :sc (sc-or-lose 'double-reg)
				   :offset (- (tn-offset x) 2)))))
    (inst fptan)
    ;; Result is in fr1
    (case (tn-offset y)
      (0
       (inst fxch fr1))
      (1)
      (t
       (inst fxch fr1)
       (inst fstd y)))))
	     
#+nil
(define-vop (fexp)
  (:translate %exp)
  (:args (x :scs (double-reg double-stack descriptor-reg) :target fr0))
  (:temporary (:sc double-reg :offset fr0-offset
		   :from :argument :to :result) fr0)
  (:temporary (:sc double-reg :offset fr1-offset
		   :from :argument :to :result) fr1)
  (:temporary (:sc double-reg :offset fr2-offset
		   :from :argument :to :result) fr2)
  (:results (y :scs (double-reg)))
  (:arg-types double-float)
  (:result-types double-float)
  (:policy :fast-safe)
  (:note "inline exp function")
  (:vop-var vop)
  (:save-p :compute-only)
  (:generator 5
     (note-this-location vop :internal-error)
     (sc-case x
        (double-reg
	 (cond ((zerop (tn-offset x))
		;; x is in fr0
		(inst fstp fr1)
		(inst fldl2e)
		(inst fmul fr1))
	       (t
		;; x is in a FP reg, not fr0
		(inst fstp fr0)
		(inst fldl2e)
		(inst fmul x))))
	((double-stack descriptor-reg)
	 (inst fstp fr0)
	 (inst fldl2e)
	 (if (sc-is x double-stack)
	     (inst fmuld (ea-for-df-stack x))
	   (inst fmuld (ea-for-df-desc x)))))
     ;; Now fr0=x log2(e)
     (inst fst fr1)
     (inst frndint)
     (inst fst fr2)
     (inst fsubp-sti fr1)
     (inst f2xm1)
     (inst fld1)
     (inst faddp-sti fr1)
     (inst fscale)
     (inst fld fr0)
     (case (tn-offset y)
       ((0 1))
       (t (inst fstd y)))))

;;; Modified exp that handles the following special cases:
;;; exp(+Inf) is +Inf; exp(-Inf) is 0; exp(NaN) is NaN.
(define-vop (fexp)
  (:translate %exp)
  (:args (x :scs (double-reg) :target fr0))
  (:temporary (:sc word-reg :offset eax-offset :from :eval :to :result) temp)
  (:temporary (:sc double-reg :offset fr0-offset
		   :from :argument :to :result) fr0)
  (:temporary (:sc double-reg :offset fr1-offset
		   :from :argument :to :result) fr1)
  (:temporary (:sc double-reg :offset fr2-offset
		   :from :argument :to :result) fr2)
  (:results (y :scs (double-reg)))
  (:arg-types double-float)
  (:result-types double-float)
  (:policy :fast-safe)
  (:note "inline exp function")
  (:vop-var vop)
  (:save-p :compute-only)
  (:ignore temp)
  (:generator 5
     (note-this-location vop :internal-error)
     (unless (zerop (tn-offset x))
	     (inst fxch x)		; x to top of stack
	     (unless (location= x y)
		     (inst fst x)))	; maybe save it
     ;; Check for Inf or NaN
     (inst fxam)
     (inst fnstsw)
     (inst sahf)
     (inst jmp :nc NOINFNAN)            ; Neither Inf or NaN.
     (inst jmp :np NOINFNAN)            ; NaN gives NaN? Continue.
     (inst and ah-tn #x02)              ; Test sign of Inf.
     (inst jmp :z DONE)                 ; +Inf gives +Inf.
     (inst fstp fr0)                    ; -Inf gives 0
     (inst fldz)
     (inst jmp-short DONE)
     NOINFNAN
     (inst fstp fr1)
     (inst fldl2e)
     (inst fmul fr1)
     ;; Now fr0=x log2(e)
     (inst fst fr1)
     (inst frndint)
     (inst fst fr2)
     (inst fsubp-sti fr1)
     (inst f2xm1)
     (inst fld1)
     (inst faddp-sti fr1)
     (inst fscale)
     (inst fld fr0)
     DONE
     (unless (zerop (tn-offset y))
	     (inst fstd y))))

(define-vop (flog)
  (:translate %log)
  (:args (x :scs (double-reg double-stack descriptor-reg) :target fr0))
  (:temporary (:sc double-reg :offset fr0-offset
		   :from :argument :to :result) fr0)
  (:temporary (:sc double-reg :offset fr1-offset
		   :from :argument :to :result) fr1)
  (:results (y :scs (double-reg)))
  (:arg-types double-float)
  (:result-types double-float)
  (:policy :fast-safe)
  (:note "inline log function")
  (:vop-var vop)
  (:save-p :compute-only)
  (:generator 5
     (note-this-location vop :internal-error)
     (sc-case x
        (double-reg
	 (case (tn-offset x)
	    (0
	     ;; x is in fr0
	     (inst fstp fr1)
	     (inst fldln2)
	     (inst fxch fr1))
	    (1
	     ;; x is in fr1
	     (inst fstp fr0)
	     (inst fldln2)
	     (inst fxch fr1))
	    (t
	     ;; x is in a FP reg, not fr0 or fr1
	     (inst fstp fr0)
	     (inst fstp fr0)
	     (inst fldln2)
	     (inst fldd (make-random-tn :kind :normal
					:sc (sc-or-lose 'double-reg)
					:offset (1- (tn-offset x))))))
	 (inst fyl2x))
	((double-stack descriptor-reg)
	 (inst fstp fr0)
	 (inst fstp fr0)
	 (inst fldln2)
	 (if (sc-is x double-stack)
	     (inst fldd (ea-for-df-stack x))
	   (inst fldd (ea-for-df-desc x)))
	 (inst fyl2x)))
     (inst fld fr0)
     (case (tn-offset y)
       ((0 1))
       (t (inst fstd y)))))

(define-vop (flog10)
  (:translate %log10)
  (:args (x :scs (double-reg double-stack descriptor-reg) :target fr0))
  (:temporary (:sc double-reg :offset fr0-offset
		   :from :argument :to :result) fr0)
  (:temporary (:sc double-reg :offset fr1-offset
		   :from :argument :to :result) fr1)
  (:results (y :scs (double-reg)))
  (:arg-types double-float)
  (:result-types double-float)
  (:policy :fast-safe)
  (:note "inline log10 function")
  (:vop-var vop)
  (:save-p :compute-only)
  (:generator 5
     (note-this-location vop :internal-error)
     (sc-case x
        (double-reg
	 (case (tn-offset x)
	    (0
	     ;; x is in fr0
	     (inst fstp fr1)
	     (inst fldlg2)
	     (inst fxch fr1))
	    (1
	     ;; x is in fr1
	     (inst fstp fr0)
	     (inst fldlg2)
	     (inst fxch fr1))
	    (t
	     ;; x is in a FP reg, not fr0 or fr1
	     (inst fstp fr0)
	     (inst fstp fr0)
	     (inst fldlg2)
	     (inst fldd (make-random-tn :kind :normal
					:sc (sc-or-lose 'double-reg)
					:offset (1- (tn-offset x))))))
	 (inst fyl2x))
	((double-stack descriptor-reg)
	 (inst fstp fr0)
	 (inst fstp fr0)
	 (inst fldlg2)
	 (if (sc-is x double-stack)
	     (inst fldd (ea-for-df-stack x))
	   (inst fldd (ea-for-df-desc x)))
	 (inst fyl2x)))
     (inst fld fr0)
     (case (tn-offset y)
       ((0 1))
       (t (inst fstd y)))))

(define-vop (fpow)
  (:translate %pow)
  (:args (x :scs (double-reg double-stack descriptor-reg) :target fr0)
	 (y :scs (double-reg double-stack descriptor-reg) :target fr1))
  (:temporary (:sc double-reg :offset fr0-offset
		   :from (:argument 0) :to :result) fr0)
  (:temporary (:sc double-reg :offset fr1-offset
		   :from (:argument 1) :to :result) fr1)
  (:temporary (:sc double-reg :offset fr2-offset
		   :from :load :to :result) fr2)
  (:results (r :scs (double-reg)))
  (:arg-types double-float double-float)
  (:result-types double-float)
  (:policy :fast-safe)
  (:note "inline pow function")
  (:vop-var vop)
  (:save-p :compute-only)
  (:generator 5
     (note-this-location vop :internal-error)
     ;; Setup x in fr0 and y in fr1
     (cond 
      ;; x in fr0; y in fr1
      ((and (sc-is x double-reg) (zerop (tn-offset x))
	    (sc-is y double-reg) (= 1 (tn-offset y))))
      ;; y in fr1; x not in fr0
      ((and (sc-is y double-reg) (= 1 (tn-offset y)))
       ;; Load x to fr0
       (sc-case x
          (double-reg
ram's avatar
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	  (double-stack
ram's avatar
ram committed
	   (inst fldd (ea-for-df-stack x)))
	  (descriptor-reg
ram's avatar
ram committed
	   (inst fldd (ea-for-df-desc x)))))
      ;; x in fr0; y not in fr1
      ((and (sc-is x double-reg) (zerop (tn-offset x)))
       (inst fxch fr1)
       ;; Now load y to fr0
       (sc-case y
          (double-reg
ram's avatar
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	  (double-stack
ram's avatar
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	   (inst fldd (ea-for-df-stack y)))
	  (descriptor-reg
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ram committed
	   (inst fldd (ea-for-df-desc y))))
       (inst fxch fr1))
      ;; x in fr1; y not in fr1
      ((and (sc-is x double-reg) (= 1 (tn-offset x)))
       ;; Load y to fr0
       (sc-case y
          (double-reg
ram's avatar
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	  (double-stack
ram's avatar
ram committed
	   (inst fldd (ea-for-df-stack y)))
	  (descriptor-reg
ram's avatar
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	   (inst fldd (ea-for-df-desc y))))
       (inst fxch fr1))
      ;; y in fr0;
      ((and (sc-is y double-reg) (zerop (tn-offset y)))
       (inst fxch fr1)
       ;; Now load x to fr0
       (sc-case x
          (double-reg
ram's avatar
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	  (double-stack
ram's avatar
ram committed
	   (inst fldd (ea-for-df-stack x)))
	  (descriptor-reg
ram's avatar
ram committed
	   (inst fldd (ea-for-df-desc x)))))
      ;; Neither x or y are in either fr0 or fr1
      (t
       ;; Load y then x
       (inst fstp fr0)
       (inst fstp fr0)
       (sc-case y
          (double-reg
	   (inst fldd (make-random-tn :kind :normal
				      :sc (sc-or-lose 'double-reg)
				      :offset (- (tn-offset y) 2))))
	  (double-stack
	   (inst fldd (ea-for-df-stack y)))
	  (descriptor-reg
	   (inst fldd (ea-for-df-desc y))))
       ;; Load x to fr0
       (sc-case x
          (double-reg
	   (inst fldd (make-random-tn :kind :normal
				      :sc (sc-or-lose 'double-reg)
				      :offset (1- (tn-offset x)))))
	  (double-stack
	   (inst fldd (ea-for-df-stack x)))
	  (descriptor-reg
	   (inst fldd (ea-for-df-desc x))))))
      
     ;; Now have x at fr0; and y at fr1
     (inst fyl2x)
     ;; Now fr0=y log2(x)
     (inst fld fr0)
     (inst frndint)
     (inst fst fr2)
     (inst fsubp-sti fr1)
     (inst f2xm1)
     (inst fld1)
     (inst faddp-sti fr1)
     (inst fscale)
     (inst fld fr0)
     (case (tn-offset r)
       ((0 1))
       (t (inst fstd r)))))

(define-vop (fscalen)
  (:translate %scalbn)
  (:args (x :scs (double-reg double-stack descriptor-reg) :target fr0)
	 (y :scs (signed-stack signed-reg) :target temp))
  (:temporary (:sc double-reg :offset fr0-offset
		   :from (:argument 0) :to :result) fr0)
  (:temporary (:sc double-reg :offset fr1-offset :from :eval :to :result) fr1)
  (:temporary (:sc signed-stack :from (:argument 1) :to :result) temp)
  (:results (r :scs (double-reg)))
  (:arg-types double-float signed-num)
  (:result-types double-float)
  (:policy :fast-safe)
  (:note "inline scalbn function")
  (:generator 5
     ;; Setup x in fr0 and y in fr1
     (sc-case x
       (double-reg
	(case (tn-offset x)
	 (0
	  (inst fstp fr1)
	  (sc-case y
	    (signed-reg
	     (inst mov temp y)
	     (inst fild temp))
	    (signed-stack
	     (inst fild y)))
	  (inst fxch fr1))
	 (1
	  (inst fstp fr0)
	  (sc-case y
	    (signed-reg
	     (inst mov temp y)
	     (inst fild temp))
	    (signed-stack
	     (inst fild y)))
	  (inst fxch fr1))
	 (t
	   (inst fstp fr0)
	   (inst fstp fr0)
	   (sc-case y
	     (signed-reg
	      (inst mov temp y)
	      (inst fild temp))
	     (signed-stack
	      (inst fild y)))
	   (inst fld (make-random-tn :kind :normal
				     :sc (sc-or-lose 'double-reg)
				     :offset (1- (tn-offset x)))))))
       ((double-stack descriptor-reg)
	(inst fstp fr0)
	(inst fstp fr0)
	(sc-case y
          (signed-reg
	   (inst mov temp y)
	   (inst fild temp))
	  (signed-stack
	   (inst fild y)))
	(if (sc-is x double-stack)
	    (inst fldd (ea-for-df-stack x))
	  (inst fldd (ea-for-df-desc x)))))
     (inst fscale)
     (unless (zerop (tn-offset r))
	     (inst fstd r))))

(define-vop (fscale)
  (:translate %scalb)
  (:args (x :scs (double-reg double-stack descriptor-reg) :target fr0)
	 (y :scs (double-reg double-stack descriptor-reg) :target fr1))
  (:temporary (:sc double-reg :offset fr0-offset
		   :from (:argument 0) :to :result) fr0)
  (:temporary (:sc double-reg :offset fr1-offset
		   :from (:argument 1) :to :result) fr1)
  (:results (r :scs (double-reg)))
  (:arg-types double-float double-float)
  (:result-types double-float)
  (:policy :fast-safe)
  (:note "inline scalb function")
  (:vop-var vop)
  (:save-p :compute-only)
  (:generator 5
     (note-this-location vop :internal-error)
     ;; Setup x in fr0 and y in fr1
     (cond 
      ;; x in fr0; y in fr1
      ((and (sc-is x double-reg) (zerop (tn-offset x))
	    (sc-is y double-reg) (= 1 (tn-offset y))))
      ;; y in fr1; x not in fr0
      ((and (sc-is y double-reg) (= 1 (tn-offset y)))
       ;; Load x to fr0
       (sc-case x
          (double-reg
ram's avatar
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	  (double-stack
ram's avatar
ram committed
	   (inst fldd (ea-for-df-stack x)))
	  (descriptor-reg
ram's avatar
ram committed
	   (inst fldd (ea-for-df-desc x)))))
      ;; x in fr0; y not in fr1
      ((and (sc-is x double-reg) (zerop (tn-offset x)))
       (inst fxch fr1)
       ;; Now load y to fr0
       (sc-case y
          (double-reg
ram's avatar
ram committed
	  (double-stack
ram's avatar
ram committed
	   (inst fldd (ea-for-df-stack y)))
	  (descriptor-reg
ram's avatar
ram committed
	   (inst fldd (ea-for-df-desc y))))
       (inst fxch fr1))
      ;; x in fr1; y not in fr1
      ((and (sc-is x double-reg) (= 1 (tn-offset x)))
       ;; Load y to fr0
       (sc-case y
          (double-reg
ram's avatar
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	  (double-stack
ram's avatar
ram committed
	   (inst fldd (ea-for-df-stack y)))
	  (descriptor-reg
ram's avatar
ram committed
	   (inst fldd (ea-for-df-desc y))))
       (inst fxch fr1))
      ;; y in fr0;
      ((and (sc-is y double-reg) (zerop (tn-offset y)))
       (inst fxch fr1)
       ;; Now load x to fr0
       (sc-case x
          (double-reg
ram's avatar
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	  (double-stack
ram's avatar
ram committed
	   (inst fldd (ea-for-df-stack x)))
	  (descriptor-reg
ram's avatar
ram committed
	   (inst fldd (ea-for-df-desc x)))))
      ;; Neither x or y are in either fr0 or fr1
      (t
       ;; Load y then x
       (inst fstp fr0)
       (inst fstp fr0)
       (sc-case y
          (double-reg
	   (inst fldd (make-random-tn :kind :normal
				      :sc (sc-or-lose 'double-reg)
				      :offset (- (tn-offset y) 2))))
	  (double-stack
	   (inst fldd (ea-for-df-stack y)))
	  (descriptor-reg
	   (inst fldd (ea-for-df-desc y))))
       ;; Load x to fr0
       (sc-case x
          (double-reg
	   (inst fldd (make-random-tn :kind :normal
				      :sc (sc-or-lose 'double-reg)
				      :offset (1- (tn-offset x)))))