libzahl

commit 2bb92620ce92f60a0c8b275159c9057c88d48765
parent ec9de20f0acce5e87ebb93fec8fdc2f97f32df4d
Author: Mattias Andrée <maandree@kth.se>
Date:   Sat, 30 Apr 2016 22:51:50 +0200

Some things to keep in mind when optimising

Signed-off-by: Mattias Andrée <maandree@kth.se>

Diffstat:
M
zahl-internals.h
 | 
4
++++

1 file changed, 4 insertions(+), 0 deletions(-)
diff --git a/zahl-internals.h b/zahl-internals.h
@@ -44,11 +44,15 @@
 # define ZAHL_Os     /* Don't know how. */
 # define ZAHL_Oz     /* Don't know how. */
 #endif
+/* Mostly ZAHL_O2, but sometimes ZAHL_O3, are useful.
+ * But note, often it optimal to not use any of them. */
 
 
 #define ZAHL_BITS_PER_CHAR                64
 #define ZAHL_LB_BITS_PER_CHAR             6
 #define ZAHL_CHAR_MAX                     UINT64_MAX
+/* Note: These, cannot be changed willy-nilly, some code depends
+ * on them, be cause being flexible would just be too painful. */
 
 
 #define ZAHL_FLOOR_BITS_TO_CHARS(bits)    ((bits) >> ZAHL_LB_BITS_PER_CHAR)