Tom Evans [tom@23palmer.net] wrote:
> Falk Hueffner wrote:
>
> >That's weird. What happens with -O0? What with gcc 3.3? Can you
> >perhaps attach the assembly that is generated for the "broken" case?
> >
> >
> >
>
> This is actually with gcc-3.3 (I started using it by default for these
> tests).
> Haven't tried "-O0" - will attempt that next.
These are identical...the problem must be elsewhere.
> ...tom
>
> "broken" case:
> 0000000000000f00 <pthread_reap_children>:
> f00: 00 00 bb 27 ldah gp,0(t12)
> f04: 00 00 bd 23 lda gp,0(gp)
> f08: d0 ff de 23 lda sp,-48(sp)
> f0c: 01 00 3f 20 lda t0,1
> f10: 10 00 5e b5 stq s1,16(sp)
> f14: 2a f7 23 48 sll t0,0x1f,s1
> f18: 00 00 5e b7 stq ra,0(sp)
> f1c: 08 00 3e b5 stq s0,8(sp)
> f20: 6d 01 1f 20 lda v0,365
> f24: ff ff 1f 22 lda a0,-1
> f28: 20 00 3e 22 lda a1,32(sp)
> f2c: 01 00 4a 22 lda a2,1(s1)
> f30: 13 04 ff 47 clr a3
> f34: 83 00 00 00 callsys // return from syscall always 0
> (according to strace)
> f38: 09 04 e0 47 mov v0,s0
> f3c: 10 00 60 f6 bne a3,f80
> <pthread_reap_children+0x80>
> f40: 01 00 e9 43 sextl s0,t0
> f44: 10 04 e1 47 mov t0,a0
> f48: 08 00 20 ec ble t0,f6c <pthread_reap_children+0x6c>
> f4c: 96 ff 5f d3 bsr ra,da8 <pthread_exited+0x8>
>
> I noticed that the syscall that "wait4" in libc calls is __NR_osf_wait4 (#7)
> as opposed to __NR_wait4 (#365) - could that make a difference?
>
>
> "working" case:
>
> 0000000000000f00 <pthread_reap_children>:
> f00: 00 00 bb 27 ldah gp,0(t12)
> f04: 00 00 bd 23 lda gp,0(gp)
> f08: d0 ff de 23 lda sp,-48(sp)
> f0c: 01 00 3f 20 lda t0,1
> f10: 10 00 5e b5 stq s1,16(sp)
> f14: 2a f7 23 48 sll t0,0x1f,s1
> f18: 00 00 5e b7 stq ra,0(sp)
> f1c: 08 00 3e b5 stq s0,8(sp)
> f20: 6d 01 1f 20 lda v0,365
> f24: ff ff 1f 22 lda a0,-1
> f28: 20 00 3e 22 lda a1,32(sp)
> f2c: 01 00 4a 22 lda a2,1(s1)
> f30: 13 04 ff 47 clr a3
> f34: 83 00 00 00 callsys
> f38: 09 04 e0 47 mov v0,s0
> f3c: 10 00 60 f6 bne a3,f80 <pthread_reap_children+0x80>
> f40: 01 00 e9 43 sextl s0,t0
> f44: 10 04 e1 47 mov t0,a0
> f48: 08 00 20 ec ble t0,f6c <pthread_reap_children+0x6c>
> f4c: 96 ff 5f d3 bsr ra,da8 <pthread_exited+0x8>
>
>
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--
Cheers,
Bob McElrath [Univ. of California at Davis, Department of Physics]
"In science, 'fact' can only mean 'confirmed to such a degree that it would
be perverse to withhold provisional assent.' I suppose that apples might
start to rise tomorrow, but the possibility does not merit equal time in
physics classrooms." -- Stephen Jay Gould (1941 - 2002)
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