Matthias Boehm created SYSTEMML-2040:
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Summary: Repeated IPA function inling leads to replicated prints
Key: SYSTEMML-2040
URL: https://issues.apache.org/jira/browse/SYSTEMML-2040
Project: SystemML
Issue Type: Bug
Reporter: Matthias Boehm
Due to multiple rounds of IPA with a reused function call graph, the same
function is inlined multiple times leading to replication of operations. For
most types of operations, common-subexpression elimination removes this
redundancy, but for prints and rand without seeds this leads to unnecessary
redundancy. For example,
{code}
s = "Debug info: " + sum(matrix(1,10,10))
z = foo(s);
foo = function(String msg) return (boolean flag) {
is_debug = TRUE;
if( is_debug ) {
print(msg); flag = TRUE;
}
else {
flag = FALSE;
}
}
{code}
generates the following runtime plan with 3 replicated prints
{code}
PROGRAM
--MAIN PROGRAM
----GENERIC (lines 1-2) [recompile=false]
------(19) dg(rand) [10,10,1000,1000,100] [0,0,0 -> 0MB], CP
------(20) ua(+RC) (19) [0,0,-1,-1,-1] [0,0,0 -> 0MB], CP
------(21) b(+) (20) [0,0,-1,-1,-1] [0,0,0 -> 0MB], CP
------(5) u(print) (21) [-1,-1,-1,-1,-1] [0,0,0 -> 0MB]
------(7) TWrite z [0,0,-1,-1,-1] [0,0,0 -> 0MB], CP
------(5) u(print) (21) [-1,-1,-1,-1,-1] [0,0,0 -> 0MB]
------(7) TWrite z [0,0,-1,-1,-1] [0,0,0 -> 0MB], CP
------(5) u(print) (21) [-1,-1,-1,-1,-1] [0,0,0 -> 0MB]
------(7) TWrite z [0,0,-1,-1,-1] [0,0,0 -> 0MB], CP
{code}
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