Thanks Richard for pointing out tree-ssa-sccvn.c
On Wed, Feb 6, 2013 at 8:14 PM, Richard Biener
<richard.guent...@gmail.com> wrote:
>
> Well, to ignore SSA form simply treat each SSA name as separate variable.
> You of course need to handle PHI nodes as copies on CFG edges then.
I am not sure if I understood this correctly.
Consider the following example:
if (...)
a_1 = 5;
else if (...)
a_2 = 2;
else
a_3 = 13;
# a_4 = PHI <a_1, a_2, a_3>
return a_4;
Do you mean that I treat a_1, a_2 and a_3 as 3 different variables? In
this approach, I lose the information that they are actually the same
variables.
Or should I write a mini lexer function to convert the SSA names into
original variable names by removing _1, _2, etc. as suffix from each?
Regarding PHI nodes, I think you mean, I should treat them as identity
functions, but I am not clear exactly how in the first approach above.
In second, I can just treat it as a=a.
--
Kartik
http://k4rtik.wordpress.com/
