[PATCH 5/6][ARM] Implement support for ACLE Coprocessor MCR and MRC 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_mcr(coproc, opc1, uint32_t value, CRn, CRm, opc2)       |
MCR coproc, opc1, Rt, CRn, CRm, opc2  |
+-------------------------------------------------------------------+---------------------------------------+
|void __arm_mcr2(coproc, opc1, uint32_t value, CRn, CRm, opc2)      |
MCR2 coproc, opc1, Rt, CRn, CRm, opc2 |
+-------------------------------------------------------------------+---------------------------------------+
|uint32_t __arm_mrc(coproc, opc1, CRn, CRm, opc2)                   |
MRC coproc, opc1, Rt, CRn, CRm, opc2  |
+-------------------------------------------------------------------+---------------------------------------+
|uint32_t __arm_mrc2(coproc, opc1, CRn, CRm, opc2)                  |
MRC2 coproc, opc1, Rt, CRn, CRm, opc2 |
+-------------------------------------------------------------------+---------------------------------------+
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],opc2:[0-7].  If
either of these requirements are not met a diagnostic is issued.

Is this OK for trunk?

Regards,
Andre

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

  * config/arm/arm.md (<mcr>): New.
  (<mrc>): New.
  * config/arm/arm.c (arm_coproc_builtin_available): Add
  support for mcr, mrc, mcr2 and mrc2.
  * config/arm/arm-builtins.c (MCR_QUALIFIERS): Define to...
  (arm_mcr_qualifiers): ... this. New.
  (MRC_QUALIFIERS): Define to ...
  (arm_mrc_qualifiers): ... this. New.
  (MCR_QUALIFIERS): Define to ...
  (arm_mcr_qualifiers): ... this. New.
  * config/arm/arm_acle.h (__arm_mcr, __arm_mrc, __arm_mcr2,
  __arm_mrc2): New.
  * config/arm/arm_acle_builtins.def (mcr, mcr2, mrc, mrc2): New.
  * config/arm/iterators.md (MCRI, mcr, MCR, MRCI, mrc, MRC): New.
  * config/arm/unspecs.md (VUNSPEC_MCR, VUNSPEC_MCR2, VUNSPEC_MRC,
  VUNSPEC_MRC2): New.


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

  * gcc.target/arm/acle/mcr.c: New.
  * gcc.target/arm/acle/mrc.c: New.
  * gcc.target/arm/acle/mcr2.c: New.
  * gcc.target/arm/acle/mrc2.c: New.

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