http://llvm.org/bugs/show_bug.cgi?id=15720
Bug ID: 15720
Summary: LoopVectorizer fails to vectorize loops with
increasing integer induction variable
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: Loop Optimizer
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
Loops having integer induction variable running from lower value to higher
value as shown in example below(0 to SIZE) are not vectorized.
int foo(int *aa, int *bb, int SIZE) {
int count = 190;
for(int i=0;i<SIZE;i++) {
aa[i] = bb[i] + count;
count++;
}
}
However, loops with integer induction variable running from higher value to
lower value(SIZE to 0) are successfully vectorized as in the example below.
int foo(int *aa, int *bb, int SIZE) {
int count = 190;
for(int i=SIZE;i > 0;i--) {
aa[i] = bb[i] + count;
count++;
}
}
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