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Sander de Smalen 275d51c545 [AArch64][SVE] Don't support fixedStack for SVE objects.
Fixed stack objects are preallocated and defined to be allocated before
any of the regular stack objects. These are normally used to model stack
arguments.

The AAPCS does not support passing SVE registers on the stack by value
(only by reference). The current layout also doesn't place them before
all stack objects, but rather before all SVE objects. Removing this
simplifies the code that emits the allocation/deallocation
around callee-saved registers (D84042).

This patch also removes all uses of fixedStack from from
framelayout-sve.mir, where this was used purely for testing purposes.

Reviewers: paulwalker-arm, efriedma, rengolin

Reviewed By: paulwalker-arm

Differential Revision: https://reviews.llvm.org/D84538
2020-07-28 15:45:53 +01:00
..
2019-06-17 09:13:29 +00:00
2020-06-21 15:54:17 +01:00
2019-10-08 13:23:57 +00:00
2019-07-17 19:24:02 +00:00
2019-08-15 10:12:26 +00:00
2020-02-03 11:01:05 +01:00
2019-12-05 18:10:06 +00:00
2020-02-23 19:13:13 +00:00
2019-07-17 19:24:02 +00:00

++ SVE CodeGen Warnings ++

When the WARN check lines fail in the SVE codegen tests it most likely means you
have introduced a warning due to:
1. Adding an invalid call to VectorType::getNumElements() or EVT::getVectorNumElements()
   when the type is a scalable vector.
2. Relying upon an implicit cast conversion from TypeSize to uint64_t.

For generic code, please modify your code to work with ElementCount and TypeSize directly.
For target-specific code that only deals with fixed-width vectors, use the fixed-size interfaces.
Please refer to the code where those functions live for more details.