Re: How to get m/c dependent attributes from RTL (expressions, nota variable)?

[James E Wilson <wilson at specifixinc dot com>]

Balaji S wrote:
> I have introduced m/c dependent attributes and handling it's semantics 
> via the attribute's handler. And i want to use these attributes during 
> assembly printing from RTL. How to get these attributes?

This isn't how attributes are normally used.  They are normally used for 
changing how variables/functions are defined, and how we emit RTL to 
access them.

There is no guarantee that tree info for variable declarations will 
still be accessible when converting RTL insns to assembly.  There is 
also the problem that the optimizer can do various things to memory 
load/store instructions.  There may not be a one-to-one correspondence 
between loads and variables, and hence no guarantee that you have a 
usable mem_expr.  If you need something special here, it really needs to 
be done when the RTL is emitted, not when the assembly is emitted.

> Did step through, function 'print_rtx' to have a look at how the above 
> RTL being printed. Especially memory attributes [4 g_i3+0 S2 A16]. But 
> not able to get DECL_ATTRIBUTES of 'g_i3'.

Seems like this is something you should have been able to figure out 
yourself.  If you already looked at print_rtx, then you should know that 
the the variable decl is printed from print_decl_name.  A quick grep 
shows the definition of DECL_ATTRIBUTES in tree.h.  Just apply the 
definition to node and you have the attribute list for the decl.
--
Jim Wilson, GNU Tools Support, http://www.SpecifixInc.com