History log of /llvm-project/llvm/test/CodeGen/RISCV/div-pow2.ll (Results 1 – 10 of 10)
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Revision tags: llvmorg-21-init, llvmorg-19.1.7, llvmorg-19.1.6, llvmorg-19.1.5, llvmorg-19.1.4
# 9122c523 15-Nov-2024 Pengcheng Wang <wangpengcheng.pp@bytedance.com>

[RISCV] Enable bidirectional scheduling and tracking register pressure (#115445)


This is based on other targets like PPC/AArch64 and some experiments.

This PR will only enable bidirectional schedu

[RISCV] Enable bidirectional scheduling and tracking register pressure (#115445)


This is based on other targets like PPC/AArch64 and some experiments.

This PR will only enable bidirectional scheduling and tracking register
pressure.

Disclaimer: I haven't tested it on many cores, maybe we should make
some options being features. I believe downstreams must have tried
this before, so feedbacks are welcome.

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Revision tags: llvmorg-19.1.3, llvmorg-19.1.2, llvmorg-19.1.1, llvmorg-19.1.0, llvmorg-19.1.0-rc4, llvmorg-19.1.0-rc3, llvmorg-19.1.0-rc2, llvmorg-19.1.0-rc1, llvmorg-20-init, llvmorg-18.1.8, llvmorg-18.1.7, llvmorg-18.1.6, llvmorg-18.1.5, llvmorg-18.1.4, llvmorg-18.1.3, llvmorg-18.1.2, llvmorg-18.1.1, llvmorg-18.1.0, llvmorg-18.1.0-rc4, llvmorg-18.1.0-rc3, llvmorg-18.1.0-rc2, llvmorg-18.1.0-rc1, llvmorg-19-init, llvmorg-17.0.6, llvmorg-17.0.5, llvmorg-17.0.4, llvmorg-17.0.3, llvmorg-17.0.2, llvmorg-17.0.1, llvmorg-17.0.0, llvmorg-17.0.0-rc4, llvmorg-17.0.0-rc3, llvmorg-17.0.0-rc2, llvmorg-17.0.0-rc1, llvmorg-18-init, llvmorg-16.0.6, llvmorg-16.0.5, llvmorg-16.0.4, llvmorg-16.0.3, llvmorg-16.0.2, llvmorg-16.0.1, llvmorg-16.0.0, llvmorg-16.0.0-rc4, llvmorg-16.0.0-rc3, llvmorg-16.0.0-rc2, llvmorg-16.0.0-rc1, llvmorg-17-init
# 86eff6be 20-Jan-2023 Philip Reames <preames@rivosinc.com>

[MachineCombiner] Use default latency model when no detailed model available

This change adjusts the cost modeling used when the target does not have a schedule model with individual instruction lat

[MachineCombiner] Use default latency model when no detailed model available

This change adjusts the cost modeling used when the target does not have a schedule model with individual instruction latencies. After this change, we use the default latency information available from TargetSchedule. The default latency information essentially ends up treating most instructions as latency 1, with a few "expensive" ones getting a higher cost.

Previously, we unconditionally applied the first legal pattern - without any consideration of profitability. As a result, this change both prevents some patterns being applied, and changes which patterns are exercised. (i.e. previously the first pattern was applied, afterwards, maybe the second one is because the first wasn't profitable.)

The motivation here is two fold.

First, this brings the default behavior in line with the behavior when -mcpu or -mtune is specified. This improves test coverage, and generally makes it less likely we will have bad surprises when providing more information to the compiler.

Second, this enables some reassociation for ILP by default. Despite being unconditionally enabled, the prior code tended to "reassociate" repeatedly through an entire chain and simply moving the first operand to the end. The result was still a serial chain, just a different one. With this change, one of the intermediate transforms is unprofitable and we end up with a partially flattened tree.

Note that the resulting code diffs show significant room for improvement in the basic algorithm. I am intentionally excluding those from this patch.

For the test diffs, I don't seen any concerning regressions. I took a fairly close look at the RISCV ones, but only skimmed the x86 (particularly vector x86) changes.

Differential Revision: https://reviews.llvm.org/D141017

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Revision tags: llvmorg-15.0.7
# 002005e6 22-Dec-2022 Hsiangkai Wang <hsiangkai@google.com>

[RISCV] Add integer scalar instructions to isAssociativeAndCommutative

Inspired by D138107.

We can add ADD, AND, OR, XOR, MUL, MIN[U]/MAX[U] to isAssociativeAndCommutative
to increase instruction-l

[RISCV] Add integer scalar instructions to isAssociativeAndCommutative

Inspired by D138107.

We can add ADD, AND, OR, XOR, MUL, MIN[U]/MAX[U] to isAssociativeAndCommutative
to increase instruction-level parallelism by the existing MachineCombiner pass.

Differential Revision: https://reviews.llvm.org/D140530

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# d64d3c5a 22-Dec-2022 Nitin John Raj <nitin.raj@sifive.com>

[RISCV] Add pass to remove W suffix from ADDIW and SLLIW to improve compressibility

SLLI and ADD are more compressible than SLLIW and ADDW. SLLI/ADD both have a 5-bit register encoding. SLLIW/ADDW h

[RISCV] Add pass to remove W suffix from ADDIW and SLLIW to improve compressibility

SLLI and ADD are more compressible than SLLIW and ADDW. SLLI/ADD both have a 5-bit register encoding. SLLIW/ADDW have a 3-bit register encoding. They both require the dest to also be one of the sources.

We aggressively form ADDW/SLLIW as it helps hasAllWBitUsers in RISCVISelDAGToDAG to not require recursion. So we need a pass to remove excessive -w suffixes.

Differential Revision: https://reviews.llvm.org/D139948

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# e00e20a0 01-Dec-2022 Craig Topper <craig.topper@sifive.com>

[RISCV] Add ADDW/AND/OR/XOR/SUB/SUBW to getRegAllocHints.

These instructions requires both register operands to be compressible
so I've only applied the hint if we already have a GPRC physical regis

[RISCV] Add ADDW/AND/OR/XOR/SUB/SUBW to getRegAllocHints.

These instructions requires both register operands to be compressible
so I've only applied the hint if we already have a GPRC physical register
assigned for the other register operand.

Reviewed By: reames

Differential Revision: https://reviews.llvm.org/D139079

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# a8c79121 30-Nov-2022 Craig Topper <craig.topper@sifive.com>

[RISCV] Teach getRegAllocationHints about compressible SRAI/SRLI.

Similar to previous patches for ADDI/ADDIW/SLLI/ADD, but restricted
to only cases where the register is x8-x15(GPRC reg class).

I'v

[RISCV] Teach getRegAllocationHints about compressible SRAI/SRLI.

Similar to previous patches for ADDI/ADDIW/SLLI/ADD, but restricted
to only cases where the register is x8-x15(GPRC reg class).

I've restricted it so that we can be precise about whether the
resulting instruction would be compressible. Changing the register
allocation may make some other instruction not compressible so we
should try to be accurate.

Reviewed By: asb

Differential Revision: https://reviews.llvm.org/D138740

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Revision tags: llvmorg-15.0.6
# 64612f5d 25-Nov-2022 Craig Topper <craig.topper@sifive.com>

[RISCV] Add ADD to getRegAllocationHints to improve to improve use of c.add.

add can always be compressed to c.add if one of the sources is the
same as the destination.

The same is not true for c.a

[RISCV] Add ADD to getRegAllocationHints to improve to improve use of c.add.

add can always be compressed to c.add if one of the sources is the
same as the destination.

The same is not true for c.addw where the registers need to be x8-x15.

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Revision tags: llvmorg-15.0.5, llvmorg-15.0.4, llvmorg-15.0.3, working, llvmorg-15.0.2
# 70a64fe7 21-Sep-2022 Craig Topper <craig.topper@sifive.com>

[RISCV] Remove support for the unratified Zbt extension.

This extension does not appear to be on its way to ratification.

Out of the unratified bitmanip extensions, this one had the
largest impact

[RISCV] Remove support for the unratified Zbt extension.

This extension does not appear to be on its way to ratification.

Out of the unratified bitmanip extensions, this one had the
largest impact on the compiler.

Posting this patch to start a discussion about whether we should
remove these extensions. We'll talk more at the RISC-V sync meeting this
Thursday.

Reviewed By: asb, reames

Differential Revision: https://reviews.llvm.org/D133834

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Revision tags: llvmorg-15.0.1, llvmorg-15.0.0, llvmorg-15.0.0-rc3
# b28b54f8 25-Aug-2022 jacquesguan <Jianjian.Guan@streamcomputing.com>

[RISCV][NFC] Use common prefix to simplify test.

Differential Revision: https://reviews.llvm.org/D132637


Revision tags: llvmorg-15.0.0-rc2, llvmorg-15.0.0-rc1, llvmorg-16-init, llvmorg-14.0.6, llvmorg-14.0.5, llvmorg-14.0.4, llvmorg-14.0.3, llvmorg-14.0.2, llvmorg-14.0.1, llvmorg-14.0.0, llvmorg-14.0.0-rc4, llvmorg-14.0.0-rc3, llvmorg-14.0.0-rc2, llvmorg-14.0.0-rc1, llvmorg-15-init, llvmorg-13.0.1, llvmorg-13.0.1-rc3, llvmorg-13.0.1-rc2
# 98d51c25 11-Jan-2022 wangpc <pc.wang@linux.alibaba.com>

[RISCV] Override TargetLowering::BuildSDIVPow2 to generate SELECT

When `Zbt` is enabled, we can generate SELECT for division by power
of 2, so that there is no data dependency.

Reviewed By: craig.t

[RISCV] Override TargetLowering::BuildSDIVPow2 to generate SELECT

When `Zbt` is enabled, we can generate SELECT for division by power
of 2, so that there is no data dependency.

Reviewed By: craig.topper

Differential Revision: https://reviews.llvm.org/D114856

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