From: Leandro Lucarella <llucax@gmail.com>
Date: Sun, 29 Aug 2010 05:29:59 +0000 (-0300)
Subject: Use integer division to calculate the bit position
X-Git-Url: https://git.llucax.com/software/dgc/cdgc.git/commitdiff_plain/192f4bfd2ffdaa5e6283bc16e8452fc3c218fb8a?ds=sidebyside

Use integer division to calculate the bit position

Any decent compiler can optimize the division by a power of 2 to a shift.
---

diff --git a/rt/gc/cdgc/gc.d b/rt/gc/cdgc/gc.d
index 3122215..432aab9 100644
--- a/rt/gc/cdgc/gc.d
+++ b/rt/gc/cdgc/gc.d
@@ -651,7 +651,7 @@ void mark_range(void *pbot, void *ptop, size_t* pm_bitmask)
 
                 // Adjust bit to be at start of allocated memory block
                 if (bin <= B_PAGE)
-                    bit_i = (offset & notbinsize[bin]) >> 4;
+                    bit_i = (offset & notbinsize[bin]) / 16;
                 else if (bin == B_PAGEPLUS)
                 {
                     do