https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64516
Markus F.X.J. Oberhumer <markus at oberhumer dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Known to work| |4.3.3
--- Comment #2 from Markus F.X.J. Oberhumer <markus at oberhumer dot com> ---
This is a wrong code regression against gcc 4.3.3.
I've booted an older ARM Ubuntu box just for testing:
$ gcc -v
[...]
gcc version 4.3.3 (Ubuntu 4.3.3-5ubuntu4)
$ gcc -O3 -Wall -W -Wcast-align -c unaligned_load_bug.c
$ objdump -d unaligned_load_bug.o
unaligned_load_bug.o: file format elf32-littlearm
Disassembly of section .text:
00000000 <put16_unaligned>:
0: e52de004 push {lr} ; (str lr, [sp, #-4]!)
4: e24dd00c sub sp, sp, #12 ; 0xc
8: e28d3008 add r3, sp, #8 ; 0x8
c: e3a02002 mov r2, #2 ; 0x2
10: e16310b2 strh r1, [r3, #-2]!
14: e1a01003 mov r1, r3
18: ebfffffe bl 0 <memcpy>
1c: e28dd00c add sp, sp, #12 ; 0xc
20: e8bd8000 pop {pc}
00000024 <get16_unaligned>:
24: e52de004 push {lr} ; (str lr, [sp, #-4]!)
28: e24dd00c sub sp, sp, #12 ; 0xc
2c: e1a01000 mov r1, r0
30: e3a02002 mov r2, #2 ; 0x2
34: e28d0006 add r0, sp, #6 ; 0x6
38: ebfffffe bl 0 <memcpy>
3c: e1dd00b6 ldrh r0, [sp, #6]
40: e28dd00c add sp, sp, #12 ; 0xc
44: e8bd8000 pop {pc}
00000048 <put16_aligned>:
48: e1c010b0 strh r1, [r0]
4c: e12fff1e bx lr
00000050 <get16_aligned>:
50: e1d000b0 ldrh r0, [r0]
54: e12fff1e bx lr
