Add malloc table dump

2019-08-30 22:18:05 +00:00 · 2019-08-30 22:18:05 +00:00 · 4e188235f9
commit 4e188235f9
parent aec0218ccf
3 changed files with 65 additions and 17 deletions
--- a/lib/popcnt.asm
+++ b/lib/popcnt.asm
@ -0,0 +1,30 @@
+popcnt:
+  push bx
+  push cx
+
+  mov bx, ax
+  and ax, 0x5555 ; 8x 01
+  and bx, 0xaaaa ; 8x 10
+  sar bx, 1
+  add ax, bx
+
+  mov bx, ax
+  and ax, 0x3333 ; 4x 0011
+  and bx, 0xcccc ; 4x 1100
+  mov cl, 2
+  sar bx, cl
+  add ax, bx
+
+  mov bx, ax
+  and ax, 0x0f0f ; 2x 00001111
+  and bx, 0xf0f0 ; 2x 11110000
+  mov cl, 4
+  sar bx, cl
+  add ax, bx
+
+  add al, ah
+  xor ah, ah
+
+  pop cx
+  pop bx
+  ret