| #include <stdio.h> |
| #include "header.h" |
| |
| void foo(union u *ptr, int flag) |
| { |
| union u local; |
| local.i = ptr->i; |
| |
| printf("Calling printf to trash r0..r3\n"); |
| /* |
| * Clang 3.1 generates the following instructions to store flag into |
| * local.s.x. Because str is paired with ldrh, the high half-word in r0 is |
| * uninitialized and the corresponding positions in local.s.i will be |
| * clobbered. |
| * |
| * 1a: f8bd 0004 ldrh.w r0, [sp, #4] |
| * 1e: f005 0101 and.w r1, r5, #1 |
| * 22: f020 0001 bic.w r0, r0, #1 |
| * 26: 4308 orrs r0, r1 |
| * 28: 9001 str r0, [sp, #4] |
| */ |
| local.s.x = flag; |
| ptr->i = local.i; |
| } |
