[PATCH 6/6][ARM] Implement support for ACLE Coprocessor MCRR and MRRC intrinsics

["Andre Vieira (lists)" <Andre dot SimoesDiasVieira at arm dot com>]

Hi,

This patch implements support for the ARM ACLE Coprocessor MCR and MRC
intrinsics. See below a table mapping the intrinsics to their respective
instructions:

+-------------------------------------------------------------------+---------------------------------------+
| Intrinsic signature                                               |
Instruction pattern                   |
+-------------------------------------------------------------------+---------------------------------------+
|void __arm_mcrr(coproc, opc1, uint64_t value, CRm)                 |
MCRR coproc, opc1, Rt, Rt2, CRm       |
+-------------------------------------------------------------------+---------------------------------------+
|void __arm_mcrr2(coproc, opc1, uint64_t value, CRm)                |
MCRR2 coproc, opc1, Rt, Rt2, CRm      |
+-------------------------------------------------------------------+---------------------------------------+
|uint64_t __arm_mrrc(coproc, opc1, CRm)                             |
MRRC coproc, opc1, Rt, Rt2, CRm       |
+-------------------------------------------------------------------+---------------------------------------+
|uint64_t __arm_mrrc2(coproc, opc1, CRm)                            |
MRRC2 coproc, opc1, Rt, Rt2, CRm      |
+-------------------------------------------------------------------+---------------------------------------+
Note that any untyped variable in the intrinsic signature is required to
be a compiler-time constant and has the type 'unsigned int'.  We do some
boundary checks for coproc:[0-15], opc1[0-7] CR*:[0-31]. If either of
these requirements are not met a diagnostic is issued.

I added a new arm_arch variable for ARMv5TE to use when deciding whether
or not the MCRR and MRCC intrinsics are available.

Is this OK for trunk?

Regards,
Andre

gcc/ChangeLog:
2016-11-09  Andre Vieira  <andre.simoesdiasvieira@arm.com>

  * config/arm/arm.md (<mcrr>): New.
  (<mrrc>): New.
  * config/arm/arm.c (arm_arch5te): New.
  (arm_option_override): Set arm_arch5te.
  (arm_coproc_builtin_available): Add support for mcrr, mcrr2, mrrc
  and mrrc2.
  * config/arm/arm-builtins.c (MCRR_QUALIFIERS): Define to...
  (arm_mcrr_qualifiers): ... this. New.
  (MRRC_QUALIFIERS): Define to...
  (arm_mrrc_qualifiers): ... this. New.
  * config/arm/arm_acle.h (__arm_mcrr, __arm_mcrr2, __arm_mrrc,
  __arm_mrrc2): New.
  * config/arm/arm_acle_builtins.def (mcrr, mcrr2, mrrc, mrrc2): New.
  * config/arm/iterators.md (MCRRI, mcrr, MCRR): New.
  (MRRCI, mrrc, MRRC): New.
  * config/arm/unspecs.md (VUNSPEC_MCRR, VUNSPEC_MCRR2, VUNSPEC_MRRC,
  VUNSPEC_MRRC2): New.

gcc/testsuite/ChangeLog:

2016-11-09  Andre Vieira  <andre.simoesdiasvieira@arm.com>

  * gcc.target/arm/acle/mcrr: New.
  * gcc.target/arm/acle/mcrr2: New.
  * gcc.target/arm/acle/mrrc: New.
  * gcc.target/arm/acle/mrrc2: New.

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