X-Git-Url: http://repo.macrolet.net/gitweb/?a=blobdiff_plain;f=src%2Fcompiler%2Fx86-64%2Fsystem.lisp;h=083374fa86d0dd4062cb05ba1ac109aabd0449d5;hb=74cf7a4d01664fbf72a662ba093ad67ca243b524;hp=86d80dfd639c568697532c1c03342dc879204851;hpb=4cb16425e2ffce3f70ad6ca10f0cde4f1545fa9d;p=sbcl.git diff --git a/src/compiler/x86-64/system.lisp b/src/compiler/x86-64/system.lisp index 86d80df..083374f 100644 --- a/src/compiler/x86-64/system.lisp +++ b/src/compiler/x86-64/system.lisp @@ -28,49 +28,48 @@ (:translate widetag-of) (:policy :fast-safe) (:args (object :scs (descriptor-reg))) - (:temporary (:sc unsigned-reg :offset eax-offset :to (:result 0)) rax) + (:temporary (:sc unsigned-reg :offset rax-offset :target result + :to (:result 0)) rax) (:results (result :scs (unsigned-reg))) (:result-types positive-fixnum) (:generator 6 - (inst mov rax object) + (inst movzx rax (reg-in-size object :byte)) (inst and al-tn lowtag-mask) (inst cmp al-tn other-pointer-lowtag) (inst jmp :e OTHER-PTR) (inst cmp al-tn fun-pointer-lowtag) (inst jmp :e FUNCTION-PTR) - ;; Pick off structures and list pointers. - (inst test al-tn 1) - (inst jmp :ne DONE) - ;; Pick off fixnums. - (inst and al-tn 7) + (inst test al-tn fixnum-tag-mask) (inst jmp :e DONE) + ;; Pick off structures and list pointers. + (inst test al-tn 2) + (inst jmp :ne DONE) + ;; must be an other immediate - (inst mov rax object) + (inst movzx rax (reg-in-size object :byte)) (inst jmp DONE) FUNCTION-PTR - (load-type al-tn object (- fun-pointer-lowtag)) + (load-type rax object (- fun-pointer-lowtag)) (inst jmp DONE) OTHER-PTR - (load-type al-tn object (- other-pointer-lowtag)) + (load-type rax object (- other-pointer-lowtag)) DONE - (inst movzx result al-tn))) + (move result rax))) (define-vop (fun-subtype) (:translate fun-subtype) (:policy :fast-safe) (:args (function :scs (descriptor-reg))) - (:temporary (:sc byte-reg :from (:eval 0) :to (:eval 1)) temp) (:results (result :scs (unsigned-reg))) (:result-types positive-fixnum) (:generator 6 - (load-type temp function (- fun-pointer-lowtag)) - (inst movzx result temp))) + (load-type result function (- fun-pointer-lowtag)))) (define-vop (set-fun-subtype) (:translate (setf fun-subtype)) @@ -137,17 +136,6 @@ ;; fixnum. (inst and res (lognot lowtag-mask)) (inst shr res 1))) - -(define-vop (make-other-immediate-type) - (:args (val :scs (any-reg descriptor-reg) :target res) - (type :scs (unsigned-reg immediate))) - (:results (res :scs (any-reg descriptor-reg) :from (:argument 0))) - (:generator 2 - (move res val) - (inst shl res (- n-widetag-bits n-fixnum-tag-bits)) - (inst or res (sc-case type - (unsigned-reg type) - (immediate (tn-value type)))))) ;;;; allocation @@ -260,6 +248,13 @@ (:generator 1 (inst break pending-interrupt-trap))) +#!+sb-safepoint +(define-vop (insert-safepoint) + (:policy :fast-safe) + (:translate sb!kernel::gc-safepoint) + (:generator 0 + (emit-safepoint))) + #!+sb-thread (defknown current-thread-offset-sap ((unsigned-byte 64)) system-area-pointer (flushable)) @@ -290,7 +285,68 @@ (note-next-instruction vop :internal-error) (inst wait))) -;;;; dynamic vop count collection support +;;;; Miscellany + +;;; the RDTSC instruction (present on Pentium processors and +;;; successors) allows you to access the time-stamp counter, a 64-bit +;;; model-specific register that counts executed cycles. The +;;; instruction returns the low cycle count in EAX and high cycle +;;; count in EDX. +;;; +;;; In order to obtain more significant results on out-of-order +;;; processors (such as the Pentium II and later), we issue a +;;; serializing CPUID instruction before and after reading the cycle +;;; counter. This instruction is used for its side effect of emptying +;;; the processor pipeline, to ensure that the RDTSC instruction is +;;; executed once all pending instructions have been completed and +;;; before any others. CPUID writes to EBX and ECX in addition to EAX +;;; and EDX, so they need to be added as temporaries. +;;; +;;; Note that cache effects mean that the cycle count can vary for +;;; different executions of the same code (it counts cycles, not +;;; retired instructions). Furthermore, the results are per-processor +;;; and not per-process, so are unreliable on multiprocessor machines +;;; where processes can migrate between processors. +;;; +;;; This method of obtaining a cycle count has the advantage of being +;;; very fast (around 20 cycles), and of not requiring a system call. +;;; However, you need to know your processor's clock speed to translate +;;; this into real execution time. +;;; +;;; FIXME: This about the WITH-CYCLE-COUNTER interface a bit, and then +;;; perhaps export it from SB-SYS. + +(defknown %read-cycle-counter () (values (unsigned-byte 32) (unsigned-byte 32)) ()) + +(define-vop (%read-cycle-counter) + (:policy :fast-safe) + (:translate %read-cycle-counter) + (:temporary (:sc unsigned-reg :offset eax-offset :target lo) eax) + (:temporary (:sc unsigned-reg :offset edx-offset :target hi) edx) + (:temporary (:sc unsigned-reg :offset ebx-offset) ebx) + (:temporary (:sc unsigned-reg :offset ecx-offset) ecx) + (:ignore ebx ecx) + (:results (hi :scs (unsigned-reg)) + (lo :scs (unsigned-reg))) + (:result-types unsigned-num unsigned-num) + (:generator 5 + (zeroize eax) + ;; Intel docs seem quite consistent on only using CPUID before RDTSC, + ;; not both before and after. Go figure. + (inst cpuid) + (inst rdtsc) + (move lo eax) + (move hi edx))) + +(defmacro with-cycle-counter (&body body) + "Returns the primary value of BODY as the primary value, and the +number of CPU cycles elapsed as secondary value. EXPERIMENTAL." + (with-unique-names (hi0 hi1 lo0 lo1) + `(multiple-value-bind (,hi0 ,lo0) (%read-cycle-counter) + (values (locally ,@body) + (multiple-value-bind (,hi1 ,lo1) (%read-cycle-counter) + (+ (ash (- ,hi1 ,hi0) 32) + (- ,lo1 ,lo0))))))) #!+sb-dyncount (define-vop (count-me) @@ -300,3 +356,42 @@ (inst inc (make-ea :qword :base count-vector :disp (- (* (+ vector-data-offset index) n-word-bytes) other-pointer-lowtag))))) + +;;;; Memory barrier support + +#!+memory-barrier-vops +(define-vop (%compiler-barrier) + (:policy :fast-safe) + (:translate %compiler-barrier) + (:generator 3)) + +#!+memory-barrier-vops +(define-vop (%memory-barrier) + (:policy :fast-safe) + (:translate %memory-barrier) + (:generator 3 + (inst mfence))) + +#!+memory-barrier-vops +(define-vop (%read-barrier) + (:policy :fast-safe) + (:translate %read-barrier) + (:generator 3)) + +#!+memory-barrier-vops +(define-vop (%write-barrier) + (:policy :fast-safe) + (:translate %write-barrier) + (:generator 3)) + +#!+memory-barrier-vops +(define-vop (%data-dependency-barrier) + (:policy :fast-safe) + (:translate %data-dependency-barrier) + (:generator 3)) + +(define-vop (pause) + (:translate spin-loop-hint) + (:policy :fast-safe) + (:generator 0 + (inst pause)))