Update recent changes

Changes

@@ -38,7 +38,10 @@
 	Fixed Null COP storage for 5.16 and 5.17
 	amagic_generation was removed with 5.17
 	Fixed $$ ($PID) to be dynamic, issue 108. Thanks to flexvault for reporting this.
-	* CC (1.13): added check_entersub, check_bless - bless and new caching
+        Fixed double precision to 16 digits. The nbody shootout test passes now
+	* CC (1.13): added check_entersub, check_bless - bless and new caching.
+        Use the B::C integer and double precision logic (ivx, nvx).
+        Fixed double precision to 16 digits. The nbody shootout is now 2x faster than perl
 	* Bytecode (1.14): fixed require and op_first, issue 97
 	Fixed regex_pad offset in threaded perls >= 5.11, issue 68
 	* t/perldoc.t: perlcc fails with 5.8 because Cwd disturbs the

Todo

@@ -15,15 +15,14 @@ allocation of XPV[INAHC]V structures needs fixing: Perl tries to free
 list the same as X[IPR]V structures.
 ref counts
 perl_parse replacement
-NV overflow initialisation analog to ivx (ExtUtils::CBuilder)
 CvOUTSIDE for ordinary subs
 
 * Features
 
 Detect ExtUtils::Constant autoloaded "Your vendor has not defined"
    functions stubs. E.g. "WARNING: &Socket::AF_DATAKIT not found"
 optimize static or typed method calls. How-perl-compiles-subs-and-methods.md
-detect typed objects (my Class $obj = new Class;)
+detect typed objects (my Class $obj = new Class;) (partially done)
 modularize (-m) for faster link times
 BEGIN goto optim: skip code after BEGIN goto
   usually Carp including B in some AUTOLOAD block, issue 61
@@ -52,3 +51,4 @@ demand-loaded bytecode (leader of each basic block replaced by an op
   which loads in bytecode for its block)
 fast sub calls for CC backend
 tailcall optimization (entersub -> leavesub => goto)
+inline functions and methods

ramblings/blogs-optimizing-2.md

@@ -465,3 +465,40 @@ optimized.
     for (1..$n){
       advance(0.01);
     }
+
+Increasing precision
+--------------------
+
+The casual reader might have noticed that the compiler result would
+not pass the shootout precision tests as it produced an invalid
+result.
+
+Wanted: +-1e-8 with arg 1000
+
+    -0.169075164
+    -0.169087605
+
+Have: with arg 1000
+
+    -0.169075214
+    -0.169087656
+
+That's not even close, it's a 6 digit precision. The perl afficionado
+might remember the Config settings `nvgformat` to print out NV, and
+`d_longdbl` to define if `long double` is defined.
+
+`long double` is however not used as NV, and worst `%g` is used as
+printf format for NV, not `%.16g` as it should be done to keep double
+precision. `%g` is just a pretty result to the casual reader, but not
+suitable to keep precision, e.g. for Data::Dumper, YAML, JSON,
+or the B::C or perlito compilers.
+
+So I changed the NV format to %.16g with commit [3fc61aa](https://github.com/rurban/perl-compiler/commit/3fc61aa69af24d438a2983a15996362207443f43)
+and the precision went up, passing the nbody shootout test with argument 1000.
+
+New result with arg 1000
+
+    -0.169075164
+    -0.169087605
+
+Exactly the same.