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

[jgreenhalgh at gcc dot gnu.org]

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

--- Comment #41 from James Greenhalgh <jgreenhalgh at gcc dot gnu.org> ---
Author: jgreenhalgh
Date: Tue Jan 12 14:04:26 2016
New Revision: 232270

URL: https://gcc.gnu.org/viewcvs?rev=232270&root=gcc&view=rev
Log:
Backport: [Patch AArch64] Reinstate CANNOT_CHANGE_MODE_CLASS to fix pr67609

gcc/

        Backport from mainline.
        2015-12-09  James Greenhalgh  <james.greenhalgh@arm.com>

        PR rtl-optimization/67609
        * config/aarch64/aarch64.c
        (aarch64_cannot_change_mode_class): Don't permit word_mode
        subregs of full vector modes.
        * config/aarch64/aarch64.md (aarch64_movdi_<mode>low): Use
        zero_extract rather than truncate.
        (aarch64_movdi_<mode>high): Likewise.

gcc/testsuite/

        Backport from mainline.
        2015-12-09  James Greenhalgh  <james.greenhalgh@arm.com>

        PR rtl-optimization/67609
        * gcc.dg/torture/pr67609.c: New.


Added:
    branches/gcc-4_9-branch/gcc/testsuite/gcc.dg/torture/pr67609.c
Modified:
    branches/gcc-4_9-branch/gcc/ChangeLog
    branches/gcc-4_9-branch/gcc/config/aarch64/aarch64.c
    branches/gcc-4_9-branch/gcc/config/aarch64/aarch64.md
    branches/gcc-4_9-branch/gcc/testsuite/ChangeLog