http://llvm.org/bugs/show_bug.cgi?id=20627
Bug ID: 20627
Summary: Missed optimization for constant remainder of loop
induction variable
Product: libraries
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: Loop Optimizer
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
The optimizer should be able to eliminate the remainder operation in:
--
_Bool cond();
int f0(int N) {
int i = 0, res = 0;
while (cond()) {
if ((i % 3) == 0)
res++;
++i;
}
return res;
}
--
by introducing a new loop carried variable i' == (i % 3) and rewriting to:
--
...
if (i' == 0) {
...
}
...
++i'
if (i' == 3)
i' = 0
...
--
--
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