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Message-ID: <786dd932f06faa247e7fd3717e2d0ee39fc23581.camel@redhat.com>
Subject: Re: Access RTX register information
From: Jeff Law <law@redhat.com>
Reply-To: law@redhat.com
To: eashan gupta <gupta.eashan@gmail.com>, gcc-help@gcc.gnu.org
Date: Tue, 05 May 2020 17:06:12 -0600
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On Wed, 2020-05-06 at 04:27 +0530, eashan gupta via Gcc-help wrote:
> Hi,
> Is it possible to access the variable name if we have an RTX which is a reg
> that corresponds to a variable declared by the user?
> 
> I have found the macro REG_USERVAR_P (RTX) in rtl.h which returns the
> boolean "1 if RTX is a reg that corresponds to a variable declared by the
> user." But I am unable to get a suitable macro to get the variable name the
> reg corresponds to.
> 
> On dumping the rtl output using the command:
> 
> print_rtl_single(stdout, in_rtx);
> 
> I get output:
> 
> (reg/v:SI 68 [ c ])
> 
> where "c" was the variable name defined by me. How do I access "c" given
> the rtx statement, "in_rtx"?
If/when this information is available it would be in the REG_EXPR field which
would point back to the tree declaration.

jeff