optimization/8049: SSE unaligned vector stores crash with -O0

[Ian Ollmann]

I think the problem is that the compiler is not properly padding data.
_mm_store_ps is nearly unique in that its argument order is

	_mm_store_ps( float*, vector );

The 0x4 offset is to protect the float* that is written to the stack a few
bytes earlier. The compiler needs to insert an extra 12 bytes of padding.
In fact, it I swap the order of the arguments as follows:

	_mm_store_ps( vector, float*)

then the crash goes away.

Ian

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   Ian Ollmann, Ph.D.       iano@cco.caltech.edu
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