Hi all,
i'm currently studing alias analysis, and i have some questions, for
instance, when are the du/ud-chains calculated? Before translating to
SSA form?
If i'm not wrong the def-use chain connects a definition of a variable
to all the uses it may flow to, and the use-def chain connects a use
Hi all,
i have a doubt about unSSA: is it allways possible to map back the
versioned variables to the original variable? If it could be possible,
is there an algorithm that describe this translation back?
I have read the paper Efficiently computing static single assignment
form and the control
You'd want to avoid translating from tuples back to nested trees. Instead
when
expanding from SSA form (ok, let's make that semi-SSA form that just keeps
the UD chains but gets rid of PHI nodes (and maybe overlapping life ranges))
the expander can do expression combining by following
Depends on what SSA form you want. A rewriting form is problematic because
backends are allowed to modify the IL behind the back of the optimizers and
can emit instructions that are difficult/impossible to represent in SSA form
(parallel).
I don't exactly know what rewriting SSA form means.
Hi,
By the way, RTL is not really machine-independent. The data
structures are machine independent. But the contents are not. You
can not, even in principle, take the RTL generated for one processor
and compile it on another processor.
I thought that RTL represented something close to
Hi all,
RTL represents a low-level language, machine-independent. But I didn't
find any especification of such language represented. This is, I found
no document where the language represented were described or defined
in a grammar way. So, I 'd thank you to show me where the RTL-language
is
Hi Ramana,
I have read the documentation and i didn't found where it is
described, maybe I searched in wrong place.
RTL language definition is in rtl.def and gives the different
operators and operands. info gccint on a standard linux distribution
should help you figure out details
2008/3/10, Jim Wilson [EMAIL PROTECTED]:
Fran Baena wrote:
RTL represents a low-level language, machine-independent. But I didn't
find any especification of such language represented. This is, I found
no document where the language represented were described or defined
in a grammar
Symbols with their address taken are only renamed when they appear as
virtual operands. So, if you have:
p_3 = (i_5 10) ? a : b
a = 4
notice that 'a' is never renamed in the LHS of the assignment. It's
renamed as a virtual operand:
p_3 = (i_5 10) ? a : b
# a_9 =
If a name tag is associated to a ssa name, ¿when does it make sense to
version a name tag? (If it does)
2008/2/21, Diego Novillo [EMAIL PROTECTED]:
On 2/21/08 1:13 PM, Fran Baena wrote:
2008/2/21, Diego Novillo [EMAIL PROTECTED]:
On 2/19/08 2:27 PM, Fran Baena wrote:
Hi everybody
2008/2/21, Diego Novillo [EMAIL PROTECTED]:
On 2/19/08 2:27 PM, Fran Baena wrote:
Hi everybody,
i am studing how gcc carries out Alias Representation and some questions
appear.
For instance, given this code portion:
if ( ... )
p = a;
else
Hi everybody,
i am studing how gcc carries out Alias Representation and some questions appear.
For instance, given this code portion:
if ( ... )
p = a;
else
if ( ... )
p = b;
else
p = c;
a = 5;
b = 3;
d = *p4;
My questions are:
- both p like *p need a Name Memory Tag
2007/11/13, Diego Novillo [EMAIL PROTECTED]:
On Nov 13, 2007 1:38 PM, Fran Baena [EMAIL PROTECTED] wrote:
1. Convert the function into GIMPLE form. Implemented in gimplify.c
and c-simplify.c.
2. Find variable references in the code. Implemented in tree-dfa.c.
3. Build a control
Hi again,
i have been studing gcc docs to undestand SSA and steps to take to get
SSA form. In one GCC online document:
http://gcc.gnu.org/projects/tree-ssa/#ssa, the steps to translate to
SSA form are listed. Here, i copy and paste the mentioned text:
[]
Conversion to SSA form is a three
Hi,
once i have been reading lots of documents about SSA computing. I have
a few questions, conceptual ones, that stop me understanding the whole
goal of the method. Here i go:
* Why alias analysis? I mean, the pointers could be versioned like the
others vars. (I'm not saying it's not usefull, i
Hi!
i am trying to implement the SSA form, inspirated in GCC way. I have
found problems in processing indirect memory operations like arrays,
structures and pointers.
My questions are: are nodes STRUCT_FIELD_TAG, NAME_MEMORY_TAG,
SYMBOL_MEMORY_TAG used for that purpose? and, where i can find
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