[PATCH][ARM][5 Backport] PR target/69875 Fix atomic_loaddi expansion

[Kyrill Tkachov]

Hi all,

This is the GCC 5 backport of https://gcc.gnu.org/ml/gcc-patches/2016-02/msg01338.html.
The differences are that TARGET_HAVE_LPAE has to be defined in arm.h in a different way because
the ARM_FSET_HAS_CPU1 mechanism doesn't exist on this branch.
Also, the scan-assembler tests that check for the DMB instruction are updated to check for
"dmb sy" rather than "dmb ish", because the memory barrier instruction changed on trunk for GCC 6.

Bootstrapped and tested on the GCC 5 branch on arm-none-linux-gnueabihf.

Ok for the branch after the trunk patch has had a few days to bake?

Thanks,
Kyrill

2016-02-24  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>

     PR target/69875
     * config/arm/arm.h (TARGET_HAVE_LPAE): Define.
     * config/arm/unspecs.md (VUNSPEC_LDRD_ATOMIC): New value.
     * config/arm/sync.md (arm_atomic_loaddi2_ldrd): New pattern.
     (atomic_loaddi_1): Delete.
     (atomic_loaddi): Rewrite expander using the above changes.

2016-02-24  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>

     PR target/69875
     * gcc.target/arm/atomic_loaddi_acquire.x: New file.
     * gcc.target/arm/atomic_loaddi_relaxed.x: Likewise.
     * gcc.target/arm/atomic_loaddi_seq_cst.x: Likewise.
     * gcc.target/arm/atomic_loaddi_1.c: New test.
     * gcc.target/arm/atomic_loaddi_2.c: Likewise.
     * gcc.target/arm/atomic_loaddi_3.c: Likewise.
     * gcc.target/arm/atomic_loaddi_4.c: Likewise.
     * gcc.target/arm/atomic_loaddi_5.c: Likewise.
     * gcc.target/arm/atomic_loaddi_6.c: Likewise.
     * gcc.target/arm/atomic_loaddi_7.c: Likewise.
     * gcc.target/arm/atomic_loaddi_8.c: Likewise.
     * gcc.target/arm/atomic_loaddi_9.c: Likewise.
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