https://llvm.org/bugs/show_bug.cgi?id=26957
Bug ID: 26957
Summary: pragma unroll ignores non-power-of-2 counts
Product: compiler-rt
Version: unspecified
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: compiler-rt
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
consider we have the following loop:
for (i = 0; i < n; i++) {
if (k == 3) s += a[i] * a[i];
else s += a[i];
k++
if(k == 7) k = 0;
}
I see that unroll on 7 is profitable here. However even if I insert:
#pragma unroll(7)
I didn't get the loop unrolled.
The potential gain for this loop is ~3 times.
(assuming we add epilogue unrolling: http://reviews.llvm.org/D18158)
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