[Flang-dev] Usage of vector pgmath symbols in Flang

Varun Jayathirtha vjayathirtha at nvidia.com
Wed Sep 18 18:35:29 EDT 2019


Hello Kiran,

I misunderstood your second question. Yes I meant to say vector routines are present in the libpgmath library.
There are no vector pgmath routine calls in libflang/libflangrti.

Regards,
Varun Jayathirtha

From: Kiran Chandramohan <Kiran.Chandramohan at arm.com>
Sent: Wednesday, September 18, 2019 1:31 PM
To: Varun Jayathirtha <vjayathirtha at nvidia.com>; flang-dev at lists.flang-compiler.org; flang-dev at lists.llvm.org
Subject: Re: Usage of vector pgmath symbols in Flang

Hello Varun,

Thanks for confirming that flang generates only calls to scalar routines and these are later converted to vector calls by changes in LLVM.

When you say vector routines are present in the Flang libraries, I am assuming that you meant to say the vector routines are present in the libpgmath library. My other question was whether there are calls to vector pgmath routines in libflang/libflangrti.

--Kiran
________________________________
From: Varun Jayathirtha <vjayathirtha at nvidia.com<mailto:vjayathirtha at nvidia.com>>
Sent: 17 September 2019 18:31
To: Kiran Chandramohan <Kiran.Chandramohan at arm.com<mailto:Kiran.Chandramohan at arm.com>>; flang-dev at lists.flang-compiler.org<mailto:flang-dev at lists.flang-compiler.org> <flang-dev at lists.flang-compiler.org<mailto:flang-dev at lists.flang-compiler.org>>; flang-dev at lists.llvm.org<mailto:flang-dev at lists.llvm.org> <flang-dev at lists.llvm.org<mailto:flang-dev at lists.llvm.org>>
Subject: RE: Usage of vector pgmath symbols in Flang


Hi Kiran,

Vector pgmath routines are present in the Flang libraries, however the Flang front end only generates scalar pgmath calls.

The LLVM vectorizer has been modified to recognize scalar pgmath calls and generate appropriate vector calls. Here's the PR that introduced this change if you're interested:
https://github.com/flang-compiler/llvm/pull/43/files

Regards,
Varun Jayathirtha



From: flang-dev <flang-dev-bounces at lists.flang-compiler.org<mailto:flang-dev-bounces at lists.flang-compiler.org>> On Behalf Of Kiran Chandramohan
Sent: Friday, September 13, 2019 7:11 AM
To: flang-dev at lists.flang-compiler.org<mailto:flang-dev at lists.flang-compiler.org>; flang-dev at lists.llvm.org<mailto:flang-dev at lists.llvm.org>
Subject: [Flang-dev] Usage of vector pgmath symbols in Flang



Hi,

Are vector pgmath symbols called directly in Flang? Are they directly used in the Flang libraries?



As far as I understand it is scalar pgmath symbols that are always generated by Flang and these are then converted to vector symbols by veclib in LLVM.

Thanks,
Kiran

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