[Bug c/42367] long vector operation causes gcc to copy arguments

[Shvaiger_Felix at emc dot com]

------- Comment #2 from Shvaiger_Felix at emc dot com  2009-12-14 16:55 -------
vector_size designed as general solution.

Section 5.42 (Using vector instructions through built-in functions)
of gcc info says:
"Specifying a combination that is not valid for the current architecture
will cause GCC to synthesize the instructions using a narrower mode.
For example, if you specify a variable of type `V4SI' and your
architecture does not allow for this specific SIMD type, GCC will
produce code that uses 4 `SIs'."

It is documented feature, so it is expected to work properly.
If not perfectly optimized then at least 'sane'.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42367