CodeGen: Eliminate dynamic relocations in the register superclass tables. (#119487)

This reapplies #119122 with a fix for UBSAN errors in the X86 backend
related
to incrementing a nullptr.

Revert "CodeGen: Eliminate dynamic relocations in the register superclass tables. (#119122)"

Reverting due to UBSan failures in X86RegisterInfo::getLargestLegalSuperClass

This reverts commit c48738

Revert "CodeGen: Eliminate dynamic relocations in the register superclass tables. (#119122)"

Reverting due to UBSan failures in X86RegisterInfo::getLargestLegalSuperClass

This reverts commit c4873819a98f59ce4e2664f94c73c2dfec3393f8.

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CodeGen: Eliminate dynamic relocations in the register superclass tables. (#119122)

[Hexagon] Remove unused includes (NFC) (#116529)

Identified with misc-include-cleaner.

[Hexagon] Remove getFirstCallerSavedNonParamReg

The last use was removed by:

commit 9eb75c45204781886c8d598a1bc9b5c37f3cb037
Author: Krzysztof Parzyszek <kparzysz@codeaurora.org>
Date: Fri

[Hexagon] Remove getFirstCallerSavedNonParamReg

The last use was removed by:

commit 9eb75c45204781886c8d598a1bc9b5c37f3cb037
Author: Krzysztof Parzyszek <kparzysz@codeaurora.org>
Date: Fri Jun 30 21:21:40 2017 +0000

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PEI should be able to use backward walk in replaceFrameIndicesBackward.

The backward register scavenger has correct register
liveness information. PEI should leverage the backward register scavenger

PEI should be able to use backward walk in replaceFrameIndicesBackward.

The backward register scavenger has correct register
liveness information. PEI should leverage the backward register scavenger.

Reviewed By: arsenm

Differential Revision: https://reviews.llvm.org/D137574

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[Hexagon] Adjust handling of stack with variable-size and extra alignment

Make the stack alignment register (AP) reserved in the given function. This
will make it available everywhere in the functio

[Hexagon] Adjust handling of stack with variable-size and extra alignment

Make the stack alignment register (AP) reserved in the given function. This
will make it available everywhere in the function, and allow aligned access
to vector register spill slots.

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[Hexagon] Use `Register` instead of `unsigned`, NFC

Use `Register` instead of `unsigned` in HexagonInstrInfo,
HexagonRegisterInfo, HexagonFrameLowering, and HexagonHardwareLoops.

[Hexagon] Remove unneeded HexagonRegisterInfo::getRARegister

That function exists in MCRegisterInfo, and is inherited into HRI.

[llvm] LLVM_FALLTHROUGH => [[fallthrough]]. NFC

With C++17 there is no Clang pedantic warning or MSVC C5051.

[NFC][CodeGen] Rename some functions in MachineInstr.h and remove duplicated comments

[Hexagon] Limit virtual register reuse range in FI elimination

[Hexagon] Improve stack address base reuse for HVX spills

The offset in HVX loads/stores is only 4 bits long, so often an
extra register is needed to hold the address. Minimize the number
of such re

[Hexagon] Improve stack address base reuse for HVX spills

The offset in HVX loads/stores is only 4 bits long, so often an
extra register is needed to hold the address. Minimize the number
of such registers by "standardizing" the base addresses and reusing
preexisting base registers when replacing frame indices.

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[SVE] Return StackOffset for TargetFrameLowering::getFrameIndexReference.

To accommodate frame layouts that have both fixed and scalable objects
on the stack, describing a stack location or offset u

[SVE] Return StackOffset for TargetFrameLowering::getFrameIndexReference.

To accommodate frame layouts that have both fixed and scalable objects
on the stack, describing a stack location or offset using a pointer + uint64_t
is not sufficient. For this reason, we've introduced the StackOffset class,
which models both the fixed- and scalable sized offsets.

The TargetFrameLowering::getFrameIndexReference is made to return a StackOffset,
so that this can be used in other interfaces, such as to eliminate frame indices
in PEI or to emit Debug locations for variables on the stack.

This patch is purely mechanical and doesn't change the behaviour of how
the result of this function is used for fixed-sized offsets. The patch adds
various checks to assert that the offset has no scalable component, as frame
offsets with a scalable component are not yet supported in various places.

Reviewed By: arsenm

Differential Revision: https://reviews.llvm.org/D90018

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CodeGen: Use Register in TargetFrameLowering

[Hexagon] v67+ HVX register pairs should support either direction

Assembler now permits pairs like 'v0:1', which are encoded
differently from the odd-first pairs like 'v1:0'.

The compiler will requ

[Hexagon] v67+ HVX register pairs should support either direction

Assembler now permits pairs like 'v0:1', which are encoded
differently from the odd-first pairs like 'v1:0'.

The compiler will require more work to leverage these new register
pairs.

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[Hexagon] Fix vector spill expansion to use proper alignment

1. Add pseudos PS_vloadrv_ai and PS_vstorerv_ai: those are now used
for single vector registers in loadRegFromStackSlot (and store...)

[Hexagon] Fix vector spill expansion to use proper alignment

1. Add pseudos PS_vloadrv_ai and PS_vstorerv_ai: those are now used
for single vector registers in loadRegFromStackSlot (and store...).
2. Remove pseudos PS_vloadrwu_ai and PS_vstorerwu_ai. The alignment is
now checked when expanding spill pseudos (both in frame lowering
and in expand-post-ra-pseudos), and a proper instruction is generated.
3. Update MachineMemOperands when dealigning vector spill slots.
4. Return vector predicate registers in getCallerSavedRegs.

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Apply llvm-prefer-register-over-unsigned from clang-tidy to LLVM

Summary:
This clang-tidy check is looking for unsigned integer variables whose initializer
starts with an implicit cast from llvm::Re

Apply llvm-prefer-register-over-unsigned from clang-tidy to LLVM

Summary:
This clang-tidy check is looking for unsigned integer variables whose initializer
starts with an implicit cast from llvm::Register and changes the type of the
variable to llvm::Register (dropping the llvm:: where possible).

Partial reverts in:
X86FrameLowering.cpp - Some functions return unsigned and arguably should be MCRegister
X86FixupLEAs.cpp - Some functions return unsigned and arguably should be MCRegister
X86FrameLowering.cpp - Some functions return unsigned and arguably should be MCRegister
HexagonBitSimplify.cpp - Function takes BitTracker::RegisterRef which appears to be unsigned&
MachineVerifier.cpp - Ambiguous operator==() given MCRegister and const Register
PPCFastISel.cpp - No Register::operator-=()
PeepholeOptimizer.cpp - TargetInstrInfo::optimizeLoadInstr() takes an unsigned&
MachineTraceMetrics.cpp - MachineTraceMetrics lacks a suitable constructor

Manual fixups in:
ARMFastISel.cpp - ARMEmitLoad() now takes a Register& instead of unsigned&
HexagonSplitDouble.cpp - Ternary operator was ambiguous between unsigned/Register
HexagonConstExtenders.cpp - Has a local class named Register, used llvm::Register instead of Register.
PPCFastISel.cpp - PPCEmitLoad() now takes a Register& instead of unsigned&

Depends on D65919

Reviewers: arsenm, bogner, craig.topper, RKSimon

Reviewed By: arsenm

Subscribers: RKSimon, craig.topper, lenary, aemerson, wuzish, jholewinski, MatzeB, qcolombet, dschuff, jyknight, dylanmckay, sdardis, nemanjai, jvesely, wdng, nhaehnle, sbc100, jgravelle-google, kristof.beyls, hiraditya, aheejin, kbarton, fedor.sergeev, javed.absar, asb, rbar, johnrusso, simoncook, apazos, sabuasal, niosHD, jrtc27, MaskRay, zzheng, edward-jones, atanasyan, rogfer01, MartinMosbeck, brucehoult, the_o, tpr, PkmX, jocewei, jsji, Petar.Avramovic, asbirlea, Jim, s.egerton, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D65962

llvm-svn: 369041

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CodeGen: Introduce a class for registers

Avoids using a plain unsigned for registers throughoug codegen.
Doesn't attempt to change every register use, just something a little
more than the set neede

CodeGen: Introduce a class for registers

Avoids using a plain unsigned for registers throughoug codegen.
Doesn't attempt to change every register use, just something a little
more than the set needed to build after changing the return type of
MachineOperand::getReg().

llvm-svn: 364191

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Update the file headers across all of the LLVM projects in the monorepo
to reflect the new license.

We understand that people may be surprised that we're moving the header
entirely to discuss the ne

Update the file headers across all of the LLVM projects in the monorepo
to reflect the new license.

We understand that people may be surprised that we're moving the header
entirely to discuss the new license. We checked this carefully with the
Foundation's lawyer and we believe this is the correct approach.

Essentially, all code in the project is now made available by the LLVM
project under our new license, so you will see that the license headers
include that license only. Some of our contributors have contributed
code under our old license, and accordingly, we have retained a copy of
our old license notice in the top-level files in each project and
repository.

llvm-svn: 351636

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[Hexagon] Foundation of support for Hexagon V66

llvm-svn: 348407

[Hexagon] Remove support for V4

llvm-svn: 344791

[Hexagon] Avoid introducing calls into coalesced range of HVX vector pairs

If an HVX vector register is to be coalesced into a vector pair, make
sure that the vector pair will not have a function ca

[Hexagon] Avoid introducing calls into coalesced range of HVX vector pairs

If an HVX vector register is to be coalesced into a vector pair, make
sure that the vector pair will not have a function call in its live range,
unless it already had one. All HVX vector registers are volatile, so
any vector register live across a function call will have to be spilled.

If a vector needs to be spilled, and it's coalesced into a vector pair
then the whole pair will need to be spilled (even if only a part of it is
live), taking extra stack space.

llvm-svn: 337073

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[Hexagon] Add guest registers

llvm-svn: 326450

[Hexagon] Implement target feature +reserved-r19

llvm-svn: 326364