[PATCH 3/3] Handle const_vector in mulv4si3 for pre-sse4.1.

[Richard Henderson]

On 2012-06-17 11:37, Uros Bizjak wrote:
> Hello!
> 
> Please note that you will probably hit PR33329, this is the reason
> that we expand multiplications after reload. Please see [1] for
> further explanation. There is gcc.target/i386/pr33329.c test to cover
> this issue, but it is not effective anymore since the simplification
> happens at tree level.
> 
> [1] http://gcc.gnu.org/ml/gcc-patches/2007-09/msg00668.html


Well, even with the test case changed s/*2/*12345/ so that the
test case continues to use a multiply instead of devolving to
a shift, does not fail.

There have been a lot of changes since 2007; I might hope that
the underlying bug has been fixed.


r~