January 2012
Intermediate to advanced
282 pages
7h 4m
English
Content preview from Pro Android Apps Performance Optimization
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
Start your free trial
Assembly
The NDK allows you to use C and C++ in your Android applications. Chapter 2 showed you what native code would look like after the C or C++ code is compiled and how you could use objdump –d to disassemble a file (object file or library). For example, the ARM assembly code of computeIterativelyFaster is shown again in Listing 3–1.
Listing 3–1. ARM Assembly Code of C Implementation of computeIterativelyFaster
00000410 <computeIterativelyFaster>:
410: e3500001 cmp r0, #1 ; 0x1
414: e92d0030 push {r4, r5}
418: 91a02000 movls r2, r0
41c: 93a03000 movls r3, #0; 0x0
420: 9a00000e bls 460 <computeIterativelyFaster+0x50>
424: e2400001 sub r0, r0, #1 ; 0x1 428: e1b010a0 lsrs r1, r0, #1 ...