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Hi, I ran into this issue recently and wanted to know if it was a bug or expected behavior. In the R600 backend's TargetTransformInfo implementation, we were setting UnrollingPreferences::Count = UINT_MAX. This was a mistake as we should have been setting UnrollingPreferences::MaxCount instead. However, as a result of setting Count to UINT_MAX, this loop would be unrolled 15 times: if (b + 4 > a) { for (int i = 0; i < 4; i++, b++) { if (b + 1 <= a) *(dst + c...

...} into loop (n/4) { <loop body> <loop body> <loop body> <loop body> } loop (n%4) { <loop body> } I set allowPartial and Runtime to both 1 ( llvm::createLoopUnrollPass(Threshold, count, 1, 1) ) Also overload the UnrollingPreferences structure to gives values to all the Partial* members, but the loop still doesn't unroll. The unrolling process hits this code in LoopUnrollRuntime.cpp // Only unroll loops with a computable trip count and the trip count needs // to be an int value (allowing a pointer type is a TODO item)...

...; <loop body> > <loop body> > <loop body> > } > loop (n%4) > { > <loop body> > } > > I set allowPartial and Runtime to both 1 ( > llvm::createLoopUnrollPass(Threshold, count, 1, 1) ) > Also overload the UnrollingPreferences structure to gives values to all > the Partial* members, but the loop still doesn't unroll. > > The unrolling process hits this code in LoopUnrollRuntime.cpp > > // Only unroll loops with a computable trip count and the trip count > needs > // to be an int value (allowi...