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[TableGen] Allow isAllocatable inheritence from any superclass 

When setting Allocatable on a generated register class check all
superclasses and set Allocatable true if any superclass is
allocatable.

Without this change generated register classes based on an
allocatable class may end up unallocatable due to the topological
inheritance order.

This change primarily effects AMDGPU backend; however, there are
a few changes in MIPs GlobalISel register constraints as a result.

Reviewed By: kparzysz

Differential Revision: https://reviews.llvm.org/D105967
This commit is contained in:
Carl Ritson 2021-07-16 12:13:29 +09:00
parent d695d0d6f6
commit f5917e0312
1 changed files with 4 additions and 1 deletions
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5
llvm/utils/TableGen/CodeGenRegisters.cpp
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@ -833,7 +833,10 @@ void CodeGenRegisterClass::inheritProperties(CodeGenRegBank &RegBank) {
Namespace = Super.Namespace;
VTs = Super.VTs;
CopyCost = Super.CopyCost;
Allocatable = Super.Allocatable;
// Check for allocatable superclasses.
Allocatable = any_of(SuperClasses, [&](const CodeGenRegisterClass *S) {
return S->Allocatable;
});
AltOrderSelect = Super.AltOrderSelect;
AllocationPriority = Super.AllocationPriority;
GeneratePressureSet |= Super.GeneratePressureSet;