On Wed Sep 26 17:00:49 2012
Luca Barbato wrote:
>> Program received signal SIGSEGV, Segmentation fault.
>> 0x105e7eb8 in compute_rematrixing_strategy (s=0x10db13a0) at
>> /home/mik/src/fate/src/libavcodec/ac3enc_template.c:356
>> 356 if (blk && block->num_rematrixing_bands !=
>> block0->num_rematrixing_bands)
>>
>> For some reason the whole expression is evaluted even if blk==0 while block0
>> is uninitialized.
>>
>
> Could you please provide the assembly for that function?
0x105e7e58 <ff_ac3_fixed_encode_frame+1216>: ld s0,56(sp)
0x105e7e5c <ff_ac3_fixed_encode_frame+1220>: jr ra
0x105e7e60 <ff_ac3_fixed_encode_frame+1224>: addiu sp,sp,144
0x105e7e64 <ff_ac3_fixed_encode_frame+1228>: blez v0,0x105e7ca4
<ff_ac3_fixed_encode_frame+780>
0x105e7e68 <ff_ac3_fixed_encode_frame+1232>: lw ra,32(sp)
0x105e7e6c <ff_ac3_fixed_encode_frame+1236>: addiu s1,s8,3004
0x105e7e70 <ff_ac3_fixed_encode_frame+1240>: move s5,zero
0x105e7e74 <ff_ac3_fixed_encode_frame+1244>: li v1,1
0x105e7e78 <ff_ac3_fixed_encode_frame+1248>: lw v0,60(s1)
0x105e7e7c <ff_ac3_fixed_encode_frame+1252>: sltiu a0,s5,1
0x105e7e80 <ff_ac3_fixed_encode_frame+1256>: sb a0,47(s1)
0x105e7e84 <ff_ac3_fixed_encode_frame+1260>: li a0,4
0x105e7e88 <ff_ac3_fixed_encode_frame+1264>: mtlo s1
0x105e7e8c <ff_ac3_fixed_encode_frame+1268>: beqz v0,0x105e7ec8
<ff_ac3_fixed_encode_frame+1328>
0x105e7e90 <ff_ac3_fixed_encode_frame+1272>: sw a0,48(s1)
0x105e7e94 <ff_ac3_fixed_encode_frame+1276>: lw v0,3904(s8)
0x105e7e98 <ff_ac3_fixed_encode_frame+1280>: li a1,4
0x105e7e9c <ff_ac3_fixed_encode_frame+1284>: slti a0,v0,62
0x105e7ea0 <ff_ac3_fixed_encode_frame+1288>: xori v0,v0,0x25
0x105e7ea4 <ff_ac3_fixed_encode_frame+1292>: subu a0,a1,a0
0x105e7ea8 <ff_ac3_fixed_encode_frame+1296>: sltiu v0,v0,1
0x105e7eac <ff_ac3_fixed_encode_frame+1300>: subu v0,a0,v0
0x105e7eb0 <ff_ac3_fixed_encode_frame+1304>: beqz s5,0x105e7ec8
<ff_ac3_fixed_encode_frame+1328>
0x105e7eb4 <ff_ac3_fixed_encode_frame+1308>: sw v0,48(s1)
=> 0x105e7eb8 <ff_ac3_fixed_encode_frame+1312>: lw a0,48(ra)
0x105e7ebc <ff_ac3_fixed_encode_frame+1316>: bnel v0,a0,0x105e7ec8
<ff_ac3_fixed_encode_frame+1328>
0x105e7ec0 <ff_ac3_fixed_encode_frame+1320>: sb v1,47(s1)
0x105e7ec4 <ff_ac3_fixed_encode_frame+1324>: nop
0x105e7ec8 <ff_ac3_fixed_encode_frame+1328>: lw v0,3972(s8)
0x105e7ecc <ff_ac3_fixed_encode_frame+1332>: lw t9,104(s1)
0x105e7ed0 <ff_ac3_fixed_encode_frame+1336>: beqz v0,0x105e8028
<ff_ac3_fixed_encode_frame+1680>
0x105e7ed4 <ff_ac3_fixed_encode_frame+1340>: lw s6,108(s1)
zero at v0 v1
R0 00000000 7400fce1 00000004 00000001
a0 a1 a2 a3
R4 00000004 00000004 00000001 00000000
a4 a5 a6 a7
R8 000062ea 00000024 00000000 00000000
t0 t1 t2 t3
R12 1de18c18 1de18c18 10eb4c94 10eb3494
s0 s1 s2 s3
R16 00000024 10db1fdc 106d3cac 00000004
s4 s5 s6 s7
R20 10db1f60 00000001 00000061 00000004
t8 t9 k0 k1
R24 00000000 00000061 00000000 00000000
gp sp s8 ra
R28 10836a20 7fe8cdd0 10db13a0 00000000
status lo hi badvaddr
0400fcf3 10db1fdc 00000000 00000030
cause pc
10000008 105e7eb8
fcsr fir restart
00000004 00770501 00000000
> Which compiler were you using?
The above is gcc-4.8 -march=mips3, also there are at least three minor gcc
versions where the result is not better.
Michael
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