Steel Bank Common Lisp

Update of /cvsroot/sbcl/sbcl/src/compiler/mips
In directory sc8-pr-cvs1.sourceforge.net:/tmp/cvs-serv16274/src/compiler/mips

Modified Files:
	vm.lisp 
Log Message:
0.9.9.5:
	Reduce storage requirements for error trap information:
	... shuffle around ANY-REG and DESCRIPTOR-REG storage classes
	    to make their SC-NUMBERs small, which makes SC-OFFSETs smaller,
	    which cuts down the size of SC-OFFSETs in error trap
	    information from three bytes to one byte;
	... saves ~250KB in core files on PPC/OS X;
	... only applies to RISCy platforms, as x86oid SC-OFFSETs already
	    fit into a single byte due to having a smaller number of
	    registers.

	Bump the fasl file version, too.


Index: vm.lisp
===================================================================
RCS file: /cvsroot/sbcl/sbcl/src/compiler/mips/vm.lisp,v
retrieving revision 1.13
retrieving revision 1.14
diff -u -d -r1.13 -r1.14
--- vm.lisp	19 Aug 2005 22:21:02 -0000	1.13
+++ vm.lisp	27 Jan 2006 15:53:19 -0000	1.14
@@ -132,20 +132,10 @@
   ;; The control stack.  (Scanned by GC)
   (control-stack control-stack)
 
-  ;; The non-descriptor stacks.
-  (signed-stack non-descriptor-stack) ; (signed-byte 32)
-  (unsigned-stack non-descriptor-stack) ; (unsigned-byte 32)
-  (character-stack non-descriptor-stack) ; non-descriptor characters.
-  (sap-stack non-descriptor-stack) ; System area pointers.
-  (single-stack non-descriptor-stack) ; single-floats
-  (double-stack non-descriptor-stack :element-size 2) ; double floats.
-  ;; complex-single-floats
-  (complex-single-stack non-descriptor-stack :element-size 2)
-  ;; complex-double-floats.
-  (complex-double-stack non-descriptor-stack :element-size 4 :alignment 2)
-
-
-  ;; **** Things that can go in the integer registers.
+  ;; We put ANY-REG and DESCRIPTOR-REG early so that their SC-NUMBER
+  ;; is small and therefore the error trap information is smaller.
+  ;; Moving them up here from their previous place down below saves
+  ;; ~250K in core file size.  --njf, 2006-01-27
 
   ;; Immediate descriptor objects.  Don't have to be seen by GC, but nothing
   ;; bad will happen if they are.  (fixnums, characters, header values, etc).
@@ -166,6 +156,21 @@
    :save-p t
    :alternate-scs (control-stack))
 
+  ;; The non-descriptor stacks.
+  (signed-stack non-descriptor-stack) ; (signed-byte 32)
+  (unsigned-stack non-descriptor-stack) ; (unsigned-byte 32)
+  (character-stack non-descriptor-stack) ; non-descriptor characters.
+  (sap-stack non-descriptor-stack) ; System area pointers.
+  (single-stack non-descriptor-stack) ; single-floats
+  (double-stack non-descriptor-stack :element-size 2) ; double floats.
+  ;; complex-single-floats
+  (complex-single-stack non-descriptor-stack :element-size 2)
+  ;; complex-double-floats.
+  (complex-double-stack non-descriptor-stack :element-size 4 :alignment 2)
+
+
+  ;; **** Things that can go in the integer registers.
+
   ;; Non-Descriptor characters
   (character-reg registers
    :locations #.non-descriptor-regs