[llvm-dev] llvm-exegesis on AArch64 architecture

[John Brawn via llvm-dev]

It looks like everything is currently broken on AArch64, because function return generation is hitting
an assert. I’ve posted D53074 to fix that.

With that fixed instructions that use only X and W registers will work. Almost anything that uses an
immediate won’t work, because the AArch64 backend uses a lot of custom immediate operand types
that aren’t marked OPERAND_IMMEDIATE (which means you get the “has unknown operands” error).

John

From: Luka Ercegovcevic [mailto:Luka.Ercegovcevic at rt-rk.com]
Sent: 09 October 2018 12:27
To: Clement Courbet
Cc: llvm-dev; John Brawn
Subject: Re: llvm-exegesis on AArch64 architecture

Could you take a look at this?

-------- Original Message --------
Subject: Re: llvm-exegesis on AArch64 architecture
Date: Friday, September 21, 2018 16:24 CEST
From: Clement Courbet <courbet at google.com>
To: Luka Ercegovcevic <Luka.Ercegovcevic at rt-rk.com>
CC: llvm-dev <llvm-dev at lists.llvm.org>, Clement Courbet <courbet at google.com>, john.brawn at arm.com
References: <5e72-5ba4fd80-1b-52e52880 at 202407086>



Hi Luka,

I don't have access to and AArch64 machine unfortunately.
I'm adding John Brawn who implemented experimental support for AArch64.

On Fri, Sep 21, 2018 at 4:17 PM, Luka Ercegovcevic <Luka.Ercegovcevic at rt-rk.com<mailto:Luka.Ercegovcevic at rt-rk.com>> wrote:
 Hi everyone,

I can't find for which opcode llvm-exegesis works on AArch64. I have used bash script from the official site that testing all opcodes for X86 architecture and I changed script to test AArch64 opcodes and there is no working case.
There are some errors:
Assertion for AArch64CallLowering::lowerReturn,
setRegTo is not implemented, results will be unreliable,
Infeasible : has unknown operands,
Infeasible : Didn't find any scheme to make the instruction serial,
Unsupported opcode: isPseudo.
Unsupported opcode: isBranch/isIndirectBranch
Unsupported opcode: isCall/isReturn

I'm using llvm trunk (native build for AARCH64), am I missing something?

Thanks!


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