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Strange error


Hi,
This is probably for the main GCC list, but anyway: I have a new machine
on which I installed multiple versions of GCC/GNU Fortran. To be
precise, I have bootstrapped and installted versions 4.2.4, 4.3.5,
4.4.0, 4.5.3 and 4.6.0. 
Now, from 4.2 to 4.4 things work as expected. With 4.5.3 and 4.6.0 I get
the following:
[sfilippo@node64-1 modules]$ gfortran -O3  -march=native  -I.. -I. -I. -DHAVE_ISO_FORTRAN_ENV -DHAVE_FLUSH_STMT -DHAVE_VOLATILE -DHAVE_MOVE_ALLOC -DMPI_H  -c psb_realloc_mod.F90
/tmp/cceVTH1u.s: Assembler messages:
/tmp/cceVTH1u.s:158: Error: no such instruction: `vmovdqa 368(%rsp),%xmm0'
/tmp/cceVTH1u.s:159: Error: no such instruction: `vmovdqa %xmm0,336(%rsp)'
/tmp/cceVTH1u.s:335: Error: no such instruction: `vmovups (%r9,%rdx),%xmm0'
/tmp/cceVTH1u.s:337: Error: no such instruction: `vmovaps %xmm0,(%rdi,%rdx)'
....................................
/tmp/cceVTH1u.s:12566: Error: no such instruction: `vmovdqu (%r8,%rax),%xmm0'
/tmp/cceVTH1u.s:12568: Error: no such instruction: `vmovdqa %xmm0,(%rdi,%rax)'
/tmp/cceVTH1u.s:12783: Error: no such instruction: `vmovdqu (%r14,%rax),%xmm0'
/tmp/cceVTH1u.s:12785: Error: no such instruction: `vmovdqa %xmm0,(%rbx,%rax)'

this is CentOS 5.6, with CPU
processor       : 0
vendor_id       : GenuineIntel
cpu family      : 6
model           : 42
model name      :        Intel(R) Core(TM) i7-2600K CPU @ 3.40GHz
stepping        : 7
cpu MHz         : 3401.000
cache size      : 8192 KB
physical id     : 0
siblings        : 8
core id         : 0
cpu cores       : 4
apicid          : 0
fpu             : yes
fpu_exception   : yes
cpuid level     : 13
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm syscall nx rdtscp lm constant_tsc ida nonstop_tsc arat pni monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr sse4_1 sse4_2 popcnt lahf_lm
bogomips        : 6784.94
clflush size    : 64
cache_alignment : 64
address sizes   : 36 bits physical, 48 bits virtual
power management: [8]


Question is obvious: what the *@!++* is going on? What would be needed
to further debug this issue? 
 
Thanks
Salvatore 



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