Simon Tatham a4b415a683 [ARM] Code-generation infrastructure for MVE. ...

This provides the low-level support to start using MVE vector types in
LLVM IR, loading and storing them, passing them to __asm__ statements
containing hand-written MVE vector instructions, and *if* you have the
hard-float ABI turned on, using them as function parameters.

(In the soft-float ABI, vector types are passed in integer registers,
and combining all those 32-bit integers into a q-reg requires support
for selection DAG nodes like insert_vector_elt and build_vector which
aren't implemented yet for MVE. In fact I've also had to add
`arm_aapcs_vfpcc` to a couple of existing tests to avoid that
problem.)

Specifically, this commit adds support for:

 * spills, reloads and register moves for MVE vector registers

 * ditto for the VPT predication mask that lives in VPR.P0

 * make all the MVE vector types legal in ISel, and provide selection
   DAG patterns for BITCAST, LOAD and STORE

 * make loads and stores of scalar FP types conditional on
   `hasFPRegs()` rather than `hasVFP2Base()`. As a result a few
   existing tests needed their llc command lines updating to use
   `-mattr=-fpregs` as their method of turning off all hardware FP
   support.

Reviewers: dmgreen, samparker, SjoerdMeijer

Subscribers: javed.absar, kristof.beyls, hiraditya, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D60708

llvm-svn: 364329

2019-06-25 16:48:46 +00:00

8.9 KiB

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