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;;; -*- Mode: LISP; Syntax: Common-Lisp; Base: 10; Package: x86 -*-
;;;
;;; **********************************************************************
;;; This code was written as part of the CMU Common Lisp project at
;;; Carnegie Mellon University, and has been placed in the public domain.
;;; If you want to use this code or any part of CMU Common Lisp, please contact
;;; Scott Fahlman or slisp-group@cs.cmu.edu.
;;;
(ext:file-comment
"$Header: /Volumes/share2/src/cmucl/cvs2git/cvsroot/src/compiler/x86/float.lisp,v 1.5 1997/04/24 20:27:06 dtc Exp $")
;;;
;;; **********************************************************************
;;;
;;; This file contains floating point support for the x86.
;;;
;;; Written by William Lott.
;;;
;;; Debugged by Paul F. Werkowski Spring/Summer 1995.
;;; Re-written and enhanced by Douglas Crosher, 1996, 1997.
(in-package :x86)
(defmacro ea-for-xf-desc(tn slot)
`(make-ea
:dword :base ,tn :disp (- (* ,slot vm:word-bytes) vm:other-pointer-type)))
(defun ea-for-sf-desc(tn)
(ea-for-xf-desc tn vm:single-float-value-slot))
(defun ea-for-df-desc(tn)
(ea-for-xf-desc tn vm:double-float-value-slot))
(defmacro ea-for-xf-stack(tn kind)
`(make-ea
:dword :base ebp-tn
:disp (- (* (+ (tn-offset ,tn) (case ,kind (:single 1) (:double 2)))
vm:word-bytes))))
(defun ea-for-sf-stack(tn)
(ea-for-xf-stack tn :single))
(defun ea-for-df-stack(tn)
(ea-for-xf-stack tn :double))
;;; Abstract out the copying of a FP register to the FP stack top, and
;;; provide two alternatives for its implementation. Note: it's not
;;; necessary to distinguish between a single or double register move
;;; here.
;;;
;;; Using a Pop then load.
(defmacro copy-fp-reg-to-fr0 (reg)
`(progn
(assert (not (zerop (tn-offset ,reg))))
(inst fstp fr0-tn)
(inst fld (make-random-tn :kind :normal
:sc (sc-or-lose 'double-reg)
:offset (1- (tn-offset ,reg))))))
;;;
;;; Using Fxch then Fst to restore the original reg contents.
#+nil
(defmacro copy-fp-reg-to-fr0 (reg)
`(progn
(assert (not (zerop (tn-offset ,reg))))
(inst fxch ,reg)
(inst fst ,reg)))
;;;; Move functions:
;;; x is source, y is destination
(define-move-function (load-single 6) (vop x y)
((single-stack) (single-reg))
(with-empty-tn@fp-top(y)
(inst fld (ea-for-sf-stack x))))
(define-move-function (store-single 6) (vop x y)
((single-reg) (single-stack))
(cond ((zerop (tn-offset x))
(inst fst (ea-for-sf-stack y)))
(t
(inst fxch x)
(inst fst (ea-for-sf-stack y))
;; This may not be necessary as ST0 is likely invalid now.
(inst fxch x))))
(define-move-function (load-double 6) (vop x y)
((double-stack) (double-reg))
(with-empty-tn@fp-top(y)
(inst fldd (ea-for-df-stack x))))
(define-move-function (store-double 6) (vop x y)
((double-reg) (double-stack))
(cond ((zerop (tn-offset x))
(inst fstd (ea-for-df-stack y)))
(t
(inst fxch x)
(inst fstd (ea-for-df-stack y))
;; This may not be necessary as ST0 is likely invalid now.
(inst fxch x))))
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;;; The i387 has instructions to load some useful constants.
;;; This doesn't save much time but might cut down on memory
;;; access and reduce the size of the constant vector (CV).
;;; Intel claims they are stored in a more precise form on chip.
;;; Anyhow, might as well use the feature. It can be turned
;;; off by hacking the "immediate-constant-sc" in vm.lisp.
(define-move-function (load-fp-constant 6) (vop x y)
((fp-single-constant)(single-reg)
(fp-double-constant)(double-reg))
(let ((value (c::constant-value (c::tn-leaf x))))
(with-empty-tn@fp-top(y)
(cond ((zerop value)
(inst fldz))
((or (= value 1s0)(= value 1d0))
(inst fld1))
((= value #.pi)
(inst fldpi))
((= value #.i387-l2t)
(inst fldl2t))
((= value #.i387-l2e)
(inst fldl2e))
((= value #.i387-lg2)
(inst fldlg2))
((= value #.i387-ln2)
(inst fldln2))
(t (warn "Ignoring bogus i387 Constant ~a" value))))))
;;;; Move VOPs:
;;;
;;; Float register to register moves.
;;;
(define-vop (single-move)
(:args (x :scs (single-reg) :target y
:load-if (not (and (sc-is x single-stack)
(sc-is y single-stack)
(location= x y)))))
(:results (y :scs (single-reg)
:load-if (not (and (sc-is x single-stack)
(sc-is y single-stack)
(location= x y)))))
(:note "float move")
(:generator 0
(unless (location= x y)
(cond ((zerop (tn-offset y))
(copy-fp-reg-to-fr0 x))
((zerop (tn-offset x))
(inst fst y))
(t
(inst fxch x)
(inst fst y)
(inst fxch x))))))
(define-move-vop single-move :move (single-reg) (single-reg))
(define-vop (double-move)
(:args (x :scs (double-reg) :target y
:load-if (not (and (sc-is x double-stack)
(sc-is y double-stack)
(location= x y)))))
(:results (y :scs (double-reg)
:load-if (not (and (sc-is x double-stack)
(sc-is y double-stack)
(location= x y)))))
(:note "float move")
(:generator 0
(unless (location= x y)
(cond ((zerop (tn-offset y))
(copy-fp-reg-to-fr0 x))
((zerop (tn-offset x))
(inst fstd y))
(t
(inst fxch x)
(inst fstd y)
(inst fxch x))))))
(define-move-vop double-move :move (double-reg) (double-reg))
;;;
;;; Move from float to a descriptor reg. allocating a new float
;;; object in the process.
;;;
(define-vop (move-from-single)
(:args (x :scs (single-reg) :to :save
:load-if (not (sc-is x fp-single-constant))))
(:results (y :scs (descriptor-reg)))
(:temporary (:sc dword-reg) ndescr)
(:note "float to pointer coercion")
(:generator 13
(if (sc-is x fp-single-constant)
(ecase (c::constant-value (c::tn-leaf x))
(0f0 (load-symbol-value y *fp-constant-0s0*))
(1f0 (load-symbol-value y *fp-constant-1s0*)))
(with-fixed-allocation (y ndescr vm:single-float-type
vm:single-float-size)
(with-tn@fp-top(x)
(inst fst (make-ea :dword :base y
:disp (- (* vm:single-float-value-slot
vm:word-bytes)
vm:other-pointer-type))))))))
(define-move-vop move-from-single :move
(single-reg) (descriptor-reg))
(define-vop (move-from-double)
(:args (x :scs (double-reg) :to :save
:load-if (not (sc-is x fp-double-constant))))
(:results (y :scs (descriptor-reg)))
(:temporary (:sc dword-reg) ndescr)
(:note "float to pointer coercion")
(:generator 13
(if (sc-is x fp-double-constant)
(ecase (c::constant-value (c::tn-leaf x))
(0d0 (load-symbol-value y *fp-constant-0d0*))
(1d0 (load-symbol-value y *fp-constant-1d0*)))
(with-fixed-allocation (y ndescr vm:double-float-type
vm:double-float-size)
(with-tn@fp-top(x)
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(inst fstd (make-ea :dword :base y
:disp (- (* vm:double-float-value-slot
vm:word-bytes)
vm:other-pointer-type))))))))
(define-move-vop move-from-double :move
(double-reg) (descriptor-reg))
;;;
;;; Move from a descriptor to a float register
;;;
(macrolet ((frob (name sc double-p)
`(progn
(define-vop (,name)
(:args (x :scs (descriptor-reg)))
(:results (y :scs (,sc)))
(:note "pointer to float coercion")
(:generator 2
(with-empty-tn@fp-top(y)
,@(if double-p
'((inst fldd (ea-for-df-desc x)))
'((inst fld (ea-for-sf-desc x)))))))
(define-move-vop ,name :move (descriptor-reg) (,sc)))))
(frob move-to-single single-reg nil)
(frob move-to-double double-reg t))
;;;
;;; The move argument vops.
;;;
;;; Note these are also used to stuffs fp numbers onto the c-call
;;; stack so the order is different than the lisp-stack.
;;; The general move-argument vop
(macrolet ((frob (name sc stack-sc double-p)
`(progn
(define-vop (,name)
(:args (x :scs (,sc) :target y)
(fp :scs (any-reg)
:load-if (not (sc-is y ,sc))))
(:results (y))
(:note "float argument move")
(:generator ,(if double-p 3 2)
(sc-case y
(,sc
(unless (location= x y)
(cond ((zerop (tn-offset y))
(copy-fp-reg-to-fr0 x))
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((zerop (tn-offset x))
(inst fstd y))
(t
(inst fxch x)
(inst fstd y)
(inst fxch x)))))
(,stack-sc
(if (= (tn-offset fp) esp-offset)
(let* ((offset (* (tn-offset y) word-bytes))
(ea (make-ea :dword :base fp :disp offset)))
(with-tn@fp-top(x)
,@(if double-p
'((inst fstd ea))
'((inst fst ea)))))
(let ((ea (make-ea
:dword :base fp
:disp (- (* (+ (tn-offset y)
,(if double-p 2 1))
vm:word-bytes)))))
(with-tn@fp-top(x)
,@(if double-p
'((inst fstd ea))
'((inst fst ea))))))))))
(define-move-vop ,name :move-argument
(,sc descriptor-reg) (,sc)))))
(frob move-single-float-argument single-reg single-stack nil)
(frob move-double-float-argument double-reg double-stack t))
;;;
(define-move-vop move-argument :move-argument
(single-reg double-reg) (descriptor-reg any-reg))
;;;; Arithmetic VOPs:
;;; dtc: The floating point arithmetic vops.
;;;
;;; Note: Although these can accept x and y on the stack or pointed to
;;; from a descriptor register, they will work with register loading
;;; without these. Same deal with the result - it need only be a
;;; register. When load-tns are needed they will probably be in ST0
;;; and the code below should be able to correctly handle all cases.
;;;
;;; However it seems to produce better code if all arg. and result
;;; options are used; on the P86 there is no extra cost in using a
;;; memory operand to the FP instructions - not so on the PPro.
;;;
;;; It may also be useful to handle constant args?
(macrolet
((frob (op fop-sti fopr-sti
fop fopr sname scost
fopd foprd dname dcost)
`(progn
(define-vop (,sname)
(:translate ,op)
(:args (x :scs (single-reg single-stack descriptor-reg)
:to :eval)
(y :scs (single-reg single-stack descriptor-reg)
:to :eval))
(:temporary (:sc single-reg :offset fr0-offset
:from :eval :to :result) fr0)
(:results (r :scs (single-reg single-stack)))
(:arg-types single-float single-float)
(:result-types single-float)
(:policy :fast-safe)
(:note "inline float arithmetic")
(:vop-var vop)
(:save-p :compute-only)
(:node-var node)
(:generator ,scost
;; Handle a few special cases
(cond
;; x, y, and r are the same register.
((and (sc-is x single-reg) (location= x r) (location= y r))
(cond ((zerop (tn-offset r))
(inst ,fop fr0))
(t
(inst fxch r)
(inst ,fop fr0)
;; XX the source register will not be valid.
(note-next-instruction vop :internal-error)
(inst fxch r))))
;; x and r are the same register.
((and (sc-is x single-reg) (location= x r))
(cond ((zerop (tn-offset r))
(sc-case y
(single-reg
;; ST(0) = ST(0) op ST(y)
(inst ,fop y))
(single-stack
;; ST(0) = ST(0) op Mem
(inst ,fop (ea-for-sf-stack y)))
(descriptor-reg
(inst ,fop (ea-for-sf-desc y)))))
(t
(single-reg
(unless (zerop (tn-offset y))
(copy-fp-reg-to-fr0 y)))
((single-stack descriptor-reg)
(inst fstp fr0)
(if (sc-is y single-stack)
(inst fld (ea-for-sf-stack y))
(inst fld (ea-for-sf-desc y)))))
;; ST(i) = ST(i) op ST0
(inst ,fop-sti r)))
(when (policy node (or (= debug 3) (> safety speed)))
(note-next-instruction vop :internal-error)
(inst wait)))
;; y and r are the same register.
((and (sc-is y single-reg) (location= y r))
(cond ((zerop (tn-offset r))
(sc-case x
(single-reg
;; ST(0) = ST(x) op ST(0)
(inst ,fopr x))
(single-stack
;; ST(0) = Mem op ST(0)
(inst ,fopr (ea-for-sf-stack x)))
(descriptor-reg
(t
;; x to ST0
(sc-case x
(single-reg
(unless (zerop (tn-offset x))
(copy-fp-reg-to-fr0 x)))
((single-stack descriptor-reg)
(inst fstp fr0)
(if (sc-is x single-stack)
(inst fld (ea-for-sf-stack x))
(inst fld (ea-for-sf-desc x)))))
;; ST(i) = ST(0) op ST(i)
(inst ,fopr-sti r)))
(when (policy node (or (= debug 3) (> safety speed)))
(note-next-instruction vop :internal-error)
(inst wait)))
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;; The default case
(t
;; Get the result to ST0.
;; Special handling is needed if x or y are in ST0, and
;; simpler code is generated.
(cond
;; x is in ST0
((and (sc-is x single-reg) (zerop (tn-offset x)))
;; ST0 = ST0 op y
(sc-case y
(single-reg
(inst ,fop y))
(single-stack
(inst ,fop (ea-for-sf-stack y)))
(descriptor-reg
(inst ,fop (ea-for-sf-desc y)))))
;; y is in ST0
((and (sc-is y single-reg) (zerop (tn-offset y)))
;; ST0 = x op ST0
(sc-case x
(single-reg
(inst ,fopr x))
(single-stack
(inst ,fopr (ea-for-sf-stack x)))
(descriptor-reg
(inst ,fopr (ea-for-sf-desc x)))))
(t
;; x to ST0
(sc-case x
(single-reg
(copy-fp-reg-to-fr0 x))
(single-stack
(inst fld (ea-for-sf-stack x)))
(descriptor-reg
(inst fstp fr0)
(inst fld (ea-for-sf-desc x))))
;; ST0 = ST0 op y
(sc-case y
(single-reg
(inst ,fop y))
(single-stack
(inst ,fop (ea-for-sf-stack y)))
(descriptor-reg
(inst ,fop (ea-for-sf-desc y))))))
(note-next-instruction vop :internal-error)
;; Finally save the result
(sc-case r
(single-reg
(cond ((zerop (tn-offset r))
(when (policy node (or (= debug 3) (> safety speed)))
(inst wait)))
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(t
(inst fst r))))
(single-stack
(inst fst (ea-for-sf-stack r))))))))
(define-vop (,dname)
(:translate ,op)
(:args (x :scs (double-reg double-stack descriptor-reg)
:to :eval)
(y :scs (double-reg double-stack descriptor-reg)
:to :eval))
(:temporary (:sc double-reg :offset fr0-offset
:from :eval :to :result) fr0)
(:results (r :scs (double-reg double-stack)))
(:arg-types double-float double-float)
(:result-types double-float)
(:policy :fast-safe)
(:note "inline float arithmetic")
(:vop-var vop)
(:save-p :compute-only)
(:node-var node)
(:generator ,dcost
;; Handle a few special cases
(cond
;; x, y, and r are the same register.
((and (sc-is x double-reg) (location= x r) (location= y r))
(cond ((zerop (tn-offset r))
(inst ,fop fr0))
(t
(inst fxch x)
(inst ,fopd fr0)
;; XX the source register will not be valid.
(note-next-instruction vop :internal-error)
(inst fxch r))))
;; x and r are the same register.
((and (sc-is x double-reg) (location= x r))
(cond ((zerop (tn-offset r))
(sc-case y
(double-reg
;; ST(0) = ST(0) op ST(y)
(inst ,fopd y))
(double-stack
;; ST(0) = ST(0) op Mem
(inst ,fopd (ea-for-df-stack y)))
(descriptor-reg
(t
;; y to ST0
(sc-case y
(double-reg
(unless (zerop (tn-offset y))
(copy-fp-reg-to-fr0 y)))
((double-stack descriptor-reg)
(inst fstp fr0)
(if (sc-is y double-stack)
(inst fldd (ea-for-df-stack y))
(inst fldd (ea-for-df-desc y)))))
;; ST(i) = ST(i) op ST0
(inst ,fop-sti r)))
(when (policy node (or (= debug 3) (> safety speed)))
(note-next-instruction vop :internal-error)
(inst wait)))
;; y and r are the same register.
((and (sc-is y double-reg) (location= y r))
(cond ((zerop (tn-offset r))
(sc-case x
(double-reg
;; ST(0) = ST(x) op ST(0)
(inst ,foprd x))
(double-stack
;; ST(0) = Mem op ST(0)
(inst ,foprd (ea-for-df-stack x)))
(descriptor-reg
(t
;; x to ST0
(sc-case x
(double-reg
(unless (zerop (tn-offset x))
(copy-fp-reg-to-fr0 x)))
((double-stack descriptor-reg)
(inst fstp fr0)
(if (sc-is x double-stack)
(inst fldd (ea-for-df-stack x))
(inst fldd (ea-for-df-desc x)))))
;; ST(i) = ST(0) op ST(i)
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(inst ,fopr-sti r)))
(when (policy node (or (= debug 3) (> safety speed)))
(note-next-instruction vop :internal-error)
(inst wait)))
;; The default case
(t
;; Get the result to ST0.
;; Special handling is needed if x or y are in ST0, and
;; simpler code is generated.
(cond
;; x is in ST0
((and (sc-is x double-reg) (zerop (tn-offset x)))
;; ST0 = ST0 op y
(sc-case y
(double-reg
(inst ,fopd y))
(double-stack
(inst ,fopd (ea-for-df-stack y)))
(descriptor-reg
(inst ,fopd (ea-for-df-desc y)))))
;; y is in ST0
((and (sc-is y double-reg) (zerop (tn-offset y)))
;; ST0 = x op ST0
(sc-case x
(double-reg
(inst ,foprd x))
(double-stack
(inst ,foprd (ea-for-df-stack x)))
(descriptor-reg
(inst ,foprd (ea-for-df-desc x)))))
(t
;; x to ST0
(sc-case x
(double-reg
(copy-fp-reg-to-fr0 x))
(double-stack
(inst fstp fr0)
(inst fldd (ea-for-df-stack x)))
(descriptor-reg
(inst fldd (ea-for-df-desc x))))
;; ST0 = ST0 op y
(sc-case y
(double-reg
(inst ,fopd y))
(double-stack
(inst ,fopd (ea-for-df-stack y)))
(descriptor-reg
(inst ,fopd (ea-for-df-desc y))))))
(note-next-instruction vop :internal-error)
;; Finally save the result
(sc-case r
(double-reg
(cond ((zerop (tn-offset r))
(when (policy node (or (= debug 3) (> safety speed)))
(inst wait)))
(t
(inst fst r))))
(double-stack
(inst fstd (ea-for-df-stack r)))))))))))
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(frob + fadd-sti fadd-sti
fadd fadd +/single-float 2
faddd faddd +/double-float 2)
(frob - fsub-sti fsubr-sti
fsub fsubr -/single-float 2
fsubd fsubrd -/double-float 2)
(frob * fmul-sti fmul-sti
fmul fmul */single-float 3
fmuld fmuld */double-float 3)
(frob / fdiv-sti fdivr-sti
fdiv fdivr //single-float 12
fdivd fdivrd //double-float 12))
(macrolet ((frob (name inst translate sc type)
`(define-vop (,name)
(:args (x :scs (,sc) :target fr0))
(:results (y :scs (,sc)))
(:translate ,translate)
(:policy :fast-safe)
(:arg-types ,type)
(:result-types ,type)
(:temporary (:sc double-reg :offset fr0-offset
:from :argument :to :result) fr0)
(:ignore fr0)
(:note "inline float arithmetic")
(:vop-var vop)
(:save-p :compute-only)
(:generator 1
(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 ,inst) ; clobber st0
(unless (zerop (tn-offset y))
(inst fst y))))))
(frob abs/single-float fabs abs single-reg single-float)
(frob abs/double-float fabs abs double-reg double-float)
(frob %negate/single-float fchs %negate single-reg single-float)
(frob %negate/double-float fchs %negate double-reg double-float))
;;;; Comparison:
(define-vop (=/float)
(:args (x) (y))
(:temporary (:sc word-reg :offset eax-offset :from :eval) temp)
(:conditional)
(:info target not-p)
(:policy :fast-safe)
(:vop-var vop)
(:save-p :compute-only)
(:note "inline float comparison")
(:ignore temp)
(:generator 3
(note-this-location vop :internal-error)
(cond
;; x is in ST0; y is in any reg.
((zerop (tn-offset x))
(inst fucom y))
;; y is in ST0; x is in another reg.
((zerop (tn-offset y))
(inst fucom x))
;; x and y are the same register, not ST0
((location= x y)
(inst fxch x)
(inst fucom fr0-tn)
(inst fxch x))
;; x and y are different registers, neither ST0.
(t
(inst fxch x)
(inst fucom y)
(inst fxch x)))
(inst fnstsw) ; status word to %ea
(inst and ah-tn #x45) ; C3 C2 C0
(inst cmp ah-tn #x40)
(inst jmp (if not-p :ne :e) target)))
(define-vop (=/single-float =/float)
(:translate =)
(:args (x :scs (single-reg))
(y :scs (single-reg)))
(:arg-types single-float single-float))
(define-vop (=/double-float =/float)
(:translate =)
(:args (x :scs (double-reg))
(y :scs (double-reg)))
(:arg-types double-float double-float))
(define-vop (<single-float)
(:translate <)
(:args (x :scs (single-reg single-stack descriptor-reg))
(y :scs (single-reg single-stack descriptor-reg)))
(:arg-types single-float single-float)
(:temporary (:sc single-reg :offset fr0-offset :from :eval) fr0)
(:temporary (:sc word-reg :offset eax-offset :from :eval) temp)
(:conditional)
(:info target not-p)
(:policy :fast-safe)
(:vop-var vop)
(:save-p :compute-only)
(:note "inline float comparison")
(:ignore temp)
(:generator 3
;; Handle a few special cases
(cond
;; y is ST0.
((and (sc-is y single-reg) (zerop (tn-offset y)))
(sc-case x
(single-reg
(inst fcom x))
((single-stack descriptor-reg)
(if (sc-is x single-stack)
(inst fcom (ea-for-sf-stack x))
(inst fcom (ea-for-sf-desc x)))))
(inst fnstsw) ; status word to %ea
(inst and ah-tn #x45))
;; General case when y is not in ST0.
(t
;; x to ST0
(sc-case x
(single-reg
(unless (zerop (tn-offset x))
(copy-fp-reg-to-fr0 x)))
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((single-stack descriptor-reg)
(inst fstp fr0)
(if (sc-is x single-stack)
(inst fld (ea-for-sf-stack x))
(inst fld (ea-for-sf-desc x)))))
(sc-case y
(single-reg
(inst fcom y))
((single-stack descriptor-reg)
(if (sc-is y single-stack)
(inst fcom (ea-for-sf-stack y))
(inst fcom (ea-for-sf-desc y)))))
(inst fnstsw) ; status word to %ea
(inst and ah-tn #x45) ; C3 C2 C0
(inst cmp ah-tn #x01)))
(inst jmp (if not-p :ne :e) target)))
(define-vop (<double-float)
(:translate <)
(:args (x :scs (double-reg double-stack descriptor-reg))
(y :scs (double-reg double-stack descriptor-reg)))
(:arg-types double-float double-float)
(:temporary (:sc double-reg :offset fr0-offset :from :eval) fr0)
(:temporary (:sc word-reg :offset eax-offset :from :eval) temp)
(:conditional)
(:info target not-p)
(:policy :fast-safe)
(:vop-var vop)
(:save-p :compute-only)
(:note "inline float comparison")
(:ignore temp)
(:generator 3
;; Handle a few special cases
(cond
;; y is ST0.
((and (sc-is y double-reg) (zerop (tn-offset y)))
(sc-case x
(double-reg
(inst fcomd x))
((double-stack descriptor-reg)
(if (sc-is x double-stack)
(inst fcomd (ea-for-df-stack x))
(inst fcomd (ea-for-df-desc x)))))
(inst fnstsw) ; status word to %ea
(inst and ah-tn #x45))
;; General case when y is not in ST0.
(t
;; x to ST0
(sc-case x
(double-reg
(unless (zerop (tn-offset x))
(copy-fp-reg-to-fr0 x)))
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((double-stack descriptor-reg)
(inst fstp fr0)
(if (sc-is x double-stack)
(inst fldd (ea-for-df-stack x))
(inst fldd (ea-for-df-desc x)))))
(sc-case y
(double-reg
(inst fcomd y))
((double-stack descriptor-reg)
(if (sc-is y double-stack)
(inst fcomd (ea-for-df-stack y))
(inst fcomd (ea-for-df-desc y)))))
(inst fnstsw) ; status word to %ea
(inst and ah-tn #x45) ; C3 C2 C0
(inst cmp ah-tn #x01)))
(inst jmp (if not-p :ne :e) target)))
(define-vop (>single-float)
(:translate >)
(:args (x :scs (single-reg single-stack descriptor-reg))
(y :scs (single-reg single-stack descriptor-reg)))
(:arg-types single-float single-float)
(:temporary (:sc single-reg :offset fr0-offset :from :eval) fr0)
(:temporary (:sc word-reg :offset eax-offset :from :eval) temp)
(:conditional)
(:info target not-p)
(:policy :fast-safe)
(:vop-var vop)
(:save-p :compute-only)
(:note "inline float comparison")
(:ignore temp)
(:generator 3
;; Handle a few special cases
(cond
;; y is ST0.
((and (sc-is y single-reg) (zerop (tn-offset y)))
(sc-case x
(single-reg
(inst fcom x))
((single-stack descriptor-reg)
(if (sc-is x single-stack)
(inst fcom (ea-for-sf-stack x))
(inst fcom (ea-for-sf-desc x)))))
(inst fnstsw) ; status word to %ea
(inst and ah-tn #x45)
(inst cmp ah-tn #x01))
;; General case when y is not in ST0.
(t
;; x to ST0
(sc-case x
(single-reg
(unless (zerop (tn-offset x))
(copy-fp-reg-to-fr0 x)))
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((single-stack descriptor-reg)
(inst fstp fr0)
(if (sc-is x single-stack)
(inst fld (ea-for-sf-stack x))
(inst fld (ea-for-sf-desc x)))))
(sc-case y
(single-reg
(inst fcom y))
((single-stack descriptor-reg)
(if (sc-is y single-stack)
(inst fcom (ea-for-sf-stack y))
(inst fcom (ea-for-sf-desc y)))))
(inst fnstsw) ; status word to %ea
(inst and ah-tn #x45)))
(inst jmp (if not-p :ne :e) target)))
(define-vop (>double-float)
(:translate >)
(:args (x :scs (double-reg double-stack descriptor-reg))
(y :scs (double-reg double-stack descriptor-reg)))
(:arg-types double-float double-float)
(:temporary (:sc double-reg :offset fr0-offset :from :eval) fr0)
(:temporary (:sc word-reg :offset eax-offset :from :eval) temp)
(:conditional)
(:info target not-p)
(:policy :fast-safe)
(:vop-var vop)
(:save-p :compute-only)
(:note "inline float comparison")
(:ignore temp)
(:generator 3
;; Handle a few special cases
(cond
;; y is ST0.
((and (sc-is y double-reg) (zerop (tn-offset y)))
(sc-case x
(double-reg
(inst fcomd x))
((double-stack descriptor-reg)
(if (sc-is x double-stack)
(inst fcomd (ea-for-df-stack x))
(inst fcomd (ea-for-df-desc x)))))
(inst fnstsw) ; status word to %ea
(inst and ah-tn #x45)
(inst cmp ah-tn #x01))
;; General case when y is not in ST0.
(t
;; x to ST0
(sc-case x
(double-reg
(unless (zerop (tn-offset x))
(copy-fp-reg-to-fr0 x)))
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((double-stack descriptor-reg)
(inst fstp fr0)
(if (sc-is x double-stack)
(inst fldd (ea-for-df-stack x))
(inst fldd (ea-for-df-desc x)))))
(sc-case y
(double-reg
(inst fcomd y))
((double-stack descriptor-reg)
(if (sc-is y double-stack)
(inst fcomd (ea-for-df-stack y))
(inst fcomd (ea-for-df-desc y)))))
(inst fnstsw) ; status word to %ea
(inst and ah-tn #x45)))
(inst jmp (if not-p :ne :e) target)))
;;; Comparisons with 0 can use the FTST instruction.
(define-vop (float-test)
(:args (x))
(:temporary (:sc word-reg :offset eax-offset :from :eval) temp)
(:conditional)
(:info target not-p y)
(:variant-vars code)
(:policy :fast-safe)
(:vop-var vop)
(:save-p :compute-only)
(:note "inline float comparison")
(:ignore temp y)
(:generator 2
(note-this-location vop :internal-error)
(cond
;; x is in ST0
((zerop (tn-offset x))
(inst ftst))
;; x not ST0
(t
(inst fxch x)
(inst ftst)
(inst fxch x)))
(inst fnstsw) ; status word to %ea
(inst and ah-tn #x45) ; C3 C2 C0
(unless (zerop code)
(inst cmp ah-tn code))
(inst jmp (if not-p :ne :e) target)))
(define-vop (=0/single-float float-test)
(:translate =)
(:args (x :scs (single-reg)))
(:arg-types single-float (:constant (single-float 0f0 0f0)))
(:variant #x40))
(define-vop (=0/double-float float-test)
(:translate =)
(:args (x :scs (double-reg)))
(:arg-types double-float (:constant (double-float 0d0 0d0)))
(:variant #x40))
(define-vop (<0/single-float float-test)
(:translate <)
(:args (x :scs (single-reg)))
(:arg-types single-float (:constant (single-float 0f0 0f0)))
(:variant #x01))
(define-vop (<0/double-float float-test)
(:translate <)
(:args (x :scs (double-reg)))
(:arg-types double-float (:constant (double-float 0d0 0d0)))
(:variant #x01))
(define-vop (>0/single-float float-test)
(:translate >)
(:args (x :scs (single-reg)))
(:arg-types single-float (:constant (single-float 0f0 0f0)))
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(:variant #x00))
(define-vop (>0/double-float float-test)
(:translate >)
(:args (x :scs (double-reg)))
(:arg-types double-float (:constant (double-float 0d0 0d0)))
(:variant #x00))
;;;; Conversion:
(macrolet ((frob (name translate to-sc to-type)
`(define-vop (,name)
(:args (x :scs (signed-stack signed-reg) :target temp))
(:temporary (:sc signed-stack) temp)
(:results (y :scs (,to-sc)))
(:arg-types signed-num)
(:result-types ,to-type)
(:policy :fast-safe)
(:note "inline float coercion")
(:translate ,translate)
(:vop-var vop)
(:save-p :compute-only)
(:generator 5
(sc-case x
(signed-reg
(inst mov temp x)