[Bug rtl-optimization/67609] [5/6 Regression] Generates wrong code for SSE2 _mm_load_pd

[rth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67609

--- Comment #32 from Richard Henderson <rth at gcc dot gnu.org> ---
Author: rth
Date: Tue Oct 27 19:59:41 2015
New Revision: 229458

URL: https://gcc.gnu.org/viewcvs?rev=229458&root=gcc&view=rev
Log:
PR rtl-opt/67609

        * config/i386/i386.c (ix86_cannot_change_mode_class): Disallow
        narrowing subregs on SSE and MMX registers.
        * doc/tm.texi.in (CANNOT_CHANGE_MODE_CLASS): Clarify when subregs that
        appear to be sub-words of multi-register pseudos must be rejected.
        * doc/tm.texi: Regenerate.
testsuite/
        * gcc.target/i386/pr67609-2.c: New test.

Added:
    trunk/gcc/testsuite/gcc.target/i386/pr67609-2.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/config/i386/i386.c
    trunk/gcc/doc/tm.texi
    trunk/gcc/doc/tm.texi.in
    trunk/gcc/testsuite/ChangeLog