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...<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) const SCEV *BECountSC = SE->getBackedgeTakenCount(L); if (isa<SCEVCouldNotCompute>(BECountSC) || !BECountSC->getType()->isInte...

Hi, I found LLVM cannot unroll the loop in the example below, while gcc can. Before I dig more about this issue, is this behavior as designed? bool bar(int i); void foo(int *a, int x, int y) { for (int i = 0; i < 4; ++i) { if (bar(i)) { break; } a[i] = i; } } Btw, if s/break/continue, LLVM is able to unroll it. Thanks, Jingyue -------------- next part --------------

...> 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) > const SCEV *BECountSC = SE->getBackedgeTakenCount(L); > if (isa<SCEVCouldNotCompute>(BECountSC) || > !...

Hello testers, Start your engines, RC3 has just been tagged (at r229050 on the branch). If this one looks good, it will become the release. There has been quite a bit of activity on the branch since RC2; let's hope it's all goodness :-) Please let me know how it looks, and upload binaries to the sftp as usual. Thanks for all your efforts so far! - Hans

I am starting to use the sample profiler to analyze new performance opportunities. The loop unroller has popped up in several of the benchmarks I'm running. In particular, libquantum. There is a ~12% opportunity when the runtime unroller is triggered. This helps functions like quantum_sigma_x (http://sourcecodebrowser.com/libquantum/0.2.4/gates_8c_source.html#l00149). The function accounts

...l.cpp for Release+Asserts build llvm[2]: Compiling Interval.cpp for Release+Asserts build llvm[3]: Building X86.td assembly matcher with tblgen llvm[2]: Compiling IntervalPartition.cpp for Release+Asserts build llvm[3]: Compiling LegalizeTypesGeneric.cpp for Release+Asserts build llvm[3]: Compiling LoopUnrollRuntime.cpp for Release+Asserts build llvm[2]: Compiling IteratedDominanceFrontier.cpp for Release+Asserts build llvm[3]: Building X86.td assembly writer #1 with tblgen llvm[2]: Compiling LazyCallGraph.cpp for Release+Asserts build llvm[3]: Compiling LegalizeVectorOps.cpp for Release+Asserts build llvm[3]...