ppc support for stack-allocatable-vectors

[sbcl.git] / src / assembly / ppc / array.lisp

diff --git a/src/assembly/ppc/array.lisp b/src/assembly/ppc/array.lisp
index e59c3c0..40409a5 100644 (file)
--- a/src/assembly/ppc/array.lisp
+++ b/src/assembly/ppc/array.lisp
@@ -12,8 +12,9 @@
 
 (in-package "SB!VM")
 \f
-(define-assembly-routine (allocate-vector
+(define-assembly-routine (allocate-vector-on-heap
                           (:policy :fast-safe)
+                          #!-stack-allocatable-vectors
                           (:translate allocate-vector)
                           (:arg-types positive-fixnum
                                       positive-fixnum
@@ -49,3 +50,44 @@
   ;;
   ;;  (storew zero-tn alloc-tn 0)
   (move result vector))
+
+#!+stack-allocatable-vectors
+(define-assembly-routine (allocate-vector-on-stack
+                          (:policy :fast-safe)
+                          (:arg-types positive-fixnum
+                                      positive-fixnum
+                                      positive-fixnum))
+    ((:arg type any-reg a0-offset)
+     (:arg length any-reg a1-offset)
+     (:arg words any-reg a2-offset)
+     (:res result descriptor-reg a0-offset)
+
+     (:temp ndescr non-descriptor-reg nl0-offset)
+     (:temp pa-flag non-descriptor-reg nl3-offset)
+     (:temp vector descriptor-reg a3-offset)
+     (:temp temp non-descriptor-reg nl2-offset))
+  (pseudo-atomic (pa-flag)
+    ;; boxed words == unboxed bytes
+    (inst addi ndescr words (* (1+ vector-data-offset) n-word-bytes))
+    (inst clrrwi ndescr ndescr n-lowtag-bits)
+    (align-csp temp)
+    (inst ori vector csp-tn other-pointer-lowtag)
+    (inst add csp-tn csp-tn ndescr)
+    (inst srwi temp type word-shift)
+    (storew temp vector 0 other-pointer-lowtag)
+    ;; Our storage is allocated, but not initialized, and our contract
+    ;; calls for it to be zero-fill.  Do so now.
+    (let ((loop (gen-label)))
+      (inst addi temp vector (- n-word-bytes other-pointer-lowtag))
+      ;; The header word has already been set, skip it.
+      (inst addi ndescr ndescr (- (fixnumize 1)))
+      (emit-label loop)
+      (inst addic. ndescr ndescr (- (fixnumize 1)))
+      (storew zero-tn temp 0)
+      (inst addi temp temp n-word-bytes)
+      (inst bgt loop))
+    ;; Our zero-fill loop always executes at least one store, so to
+    ;; ensure that there is at least one slot available to be
+    ;; clobbered, we defer setting the vector-length slot until now.
+    (storew length vector vector-length-slot other-pointer-lowtag))
+  (move result vector))