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Sander de Smalen ca5d75ffa1 [AArch64][SVE] Spilling/filling of SVE callee-saves.

Implement the spills/fills of callee-saved SVE registers using STR and LDR
instructions.

Also adds the `aarch64_sve_vector_pcs` attribute to specify the
callee-saved registers to be used for functions that return SVE vectors or
take SVE vectors as arguments. The callee-saved registers are vector
registers z8-z23 and predicate registers p4-p15.

The overal frame-layout with SVE will be as follows:

   +-------------+
   | stack args  |
   +-------------+
   | Callee Saves|
   |   X29, X30  |
   |-------------| <- FP
   | SVE Callee  | < //////////////
   | saved regs  | < //////////////
   |    z23      | < //////////////
   |     :       | < // SCALABLE //
   |    z8       | < //////////////
   |    p15      | < /// STACK ////
   |     :       | < //////////////
   |    p4       | < //// AREA ////
   +-------------+ < //////////////
   |     :       | < //////////////
   |  SVE locals | < //////////////
   |     :       | < //////////////
   +-------------+
   |/////////////| alignment gap.
   |     :       |
   | Stack objs  |
   |     :       |
   +-------------+ <- SP after call and frame-setup

Reviewers: cameron.mcinally, efriedma, greened, thegameg, ostannard, rengolin

Reviewed By: ostannard

Differential Revision: https://reviews.llvm.org/D68996

2019-11-11 09:03:19 +00:00

CMakeLists.txt

…

LLLexer.cpp

[AArch64][SVE] Spilling/filling of SVE callee-saves.

2019-11-11 09:03:19 +00:00

LLLexer.h

Update the file headers across all of the LLVM projects in the monorepo

2019-01-19 08:50:56 +00:00

LLParser.cpp

[AArch64][SVE] Spilling/filling of SVE callee-saves.

2019-11-11 09:03:19 +00:00