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Daniel Sanders 6affa236cf [globalisel][tablegen] Import stores and allow GISel to automatically substitute zero regs like WZR/XZR/$zero.

This patch enables the import of stores. Unfortunately, doing so by itself,
loses an optimization where storing 0 to memory makes use of WZR/XZR.

To mitigate this, this patch also introduces a new feature that allows register
operands to nominate a zero register. When this is done, GlobalISel will
substitute (G_CONSTANT 0) with the nominated register automatically. This
is currently configured to only apply to the stores.

Applying it to GPR32/GPR64 register classes in general will be done after
review see (https://reviews.llvm.org/D39150).



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@316360 91177308-0d34-0410-b5e6-96231b3b80d8

2017-10-23 18:19:24 +00:00

GlobalISel

[globalisel][tablegen] Map ld and st to G_LOAD and G_STORE. NFC

2017-10-15 02:41:12 +00:00

CostTable.h

[modules] Add missing include.

2016-08-19 08:30:42 +00:00

GenericOpcodes.td

[GlobalISel] Update the documentation and comment for G_[UN]MERGE_VALUES

2017-09-25 22:03:06 +00:00

Target.td

[globalisel][tablegen] Import stores and allow GISel to automatically substitute zero regs like WZR/XZR/$zero.