http://llvm.org/bugs/show_bug.cgi?id=8593
Summary: loop-unroll and unroll-count options do not work
unless loop-rotate option is passed
Product: tools
Version: 2.8
Platform: PC
OS/Version: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: opt
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
I compiled a simple program to llvm bitcode and attempted to use opt to unroll
the loop. I need to unroll loops
#include <stdlib.h>
int main() {
int a = 10;
int i, count;
for (i=0; i<a; i++)
count += i;
return count;
}
The command
opt --loop-unroll --unroll-count 5 nl.bc
does not unroll the loop wheares the command
opt --loop-rotate --loop-unroll --unroll-count 5 nl.bc
does. Even in llvm-2.8/lib/Transforms/Utils/LoopUnroll.cpp there is a line
saying
// The loop-rotate pass can be helpful to avoid this in many cases.
LoopUnroll.cpp should be fixed so that the loop unrolling functionality works
on the loop in the program above.
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