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Description of problem:
Incorrect actual parameter to asm("movups") crashes compiler.

Version-Release number of selected component (if applicable):
gcc version 3.4.3 20050227 (Red Hat 3.4.3-22.1)  

How reproducible:
Always

Steps to Reproduce:
1.gcc4 -msse3 gcc_zomplex_movups_bug.c
2.
3.
  

Actual Results:  gcc_zomplex_movups_bug.c: In function ?MPI_op_scalar_zmplx_sum?:
gcc_zomplex_movups_bug.c:24: internal compiler error: in emit_move_insn, at 
expr.c:3026
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Expected Results:  An error message from compiler telling me that I use incorrect actual parameter 
to the movups instruction.

Additional info:

The whole scenario stems from the fact that load/store of vector variables 
assumes perfect alignment. Since there is no way to tell gcc that the address to 
a vector variable is misaligned, and hence gcc should emit movups instead of 
movaps, the programmer must explicit check for alignment and use inline assembly 
to generate movups.

I have submittet a "bug report" http://gcc.gnu.org/bugzilla/show_bug.cgi?
id=20982 on the issue. In my opinion, there should be a way to specify alignment 
of vector variables. By allowing __atrribute__ ((aligned)) to specify alignment 
down to the basic type is an idea.