------- Comment #4 from siarhei dot siamashka at gmail dot com 2010-07-28
07:16 -------
Could not reproduce the problem with gcc 4.3.5
Disassembly of pr45070.o:
0000000c <next>:
c: e92d401f push {r0, r1, r2, r3, r4, lr}
10: e890000c ldm r0, {r2, r3}
14: e1a04000 mov r4, r0
18: e1520003 cmp r2, r3
1c: b3a03000 movlt r3, #0
20: ba000014 blt 78 <next+0x6c>
24: e5903008 ldr r3, [r0, #8]
28: e3530000 cmp r3, #0
2c: 0a00000e beq 6c <next+0x60>
30: e3a03000 mov r3, #0
34: e5803008 str r3, [r0, #8]
38: e2800004 add r0, r0, #4
3c: ebffffef bl 0 <fetch>
40: e1a00004 mov r0, r4
44: ebfffff0 bl c <next>
48: e1a00800 lsl r0, r0, #16
4c: e1a00840 asr r0, r0, #16
50: e5cd0000 strb r0, [sp]
54: e1a00420 lsr r0, r0, #8
58: e5cd0001 strb r0, [sp, #1]
5c: e1dd30b0 ldrh r3, [sp]
60: e1cd30bc strh r3, [sp, #12]
64: e1dd30bc ldrh r3, [sp, #12]
68: ea000002 b 78 <next+0x6c>
6c: e3a03001 mov r3, #1
70: e5803008 str r3, [r0, #8]
74: e59f3010 ldr r3, [pc, #16] ; 8c <next+0x80>
78: e1cd30bc strh r3, [sp, #12]
7c: e5dd300c ldrb r3, [sp, #12]
80: e5dd000d ldrb r0, [sp, #13]
84: e1830400 orr r0, r3, r0, lsl #8
88: e8bd801f pop {r0, r1, r2, r3, r4, pc}
^^^ POP instruction just overwrites return value in r0 register here
8c: 0000ffff .word 0x0000ffff
Looks like the function gets treated as if it were returning 'void'.
--
siarhei dot siamashka at gmail dot com changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |wrong-code
Known to fail| |4.5.0
Known to work| |4.3.5
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45070
