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Teach LoopUnrollPass to respect loop unrolling hints in metadata.
[This is resubmitting r210721, which was reverted due to suspected breakage which turned out to be unrelated]. Some extra review comments were addressed. See D4090 and D4147 for more details. The Clang change that produces this metadata was committed in r210667 Patch by Mark Heffernan. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@211076 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Eli Bendersky
parent
5ea46694d0
commit
4046db0cdb
@ -18,8 +18,10 @@
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#include "llvm/Analysis/ScalarEvolution.h"
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#include "llvm/Analysis/TargetTransformInfo.h"
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#include "llvm/IR/DataLayout.h"
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#include "llvm/IR/DiagnosticInfo.h"
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#include "llvm/IR/Dominators.h"
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#include "llvm/IR/IntrinsicInst.h"
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#include "llvm/IR/Metadata.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/raw_ostream.h"
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@ -36,7 +38,8 @@ UnrollThreshold("unroll-threshold", cl::init(150), cl::Hidden,
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static cl::opt<unsigned>
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UnrollCount("unroll-count", cl::init(0), cl::Hidden,
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cl::desc("Use this unroll count for all loops, for testing purposes"));
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cl::desc("Use this unroll count for all loops including those with "
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"unroll_count pragma values, for testing purposes"));
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static cl::opt<bool>
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UnrollAllowPartial("unroll-allow-partial", cl::init(false), cl::Hidden,
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@ -47,6 +50,11 @@ static cl::opt<bool>
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UnrollRuntime("unroll-runtime", cl::ZeroOrMore, cl::init(false), cl::Hidden,
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cl::desc("Unroll loops with run-time trip counts"));
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static cl::opt<unsigned>
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PragmaUnrollThreshold("pragma-unroll-threshold", cl::init(16 * 1024), cl::Hidden,
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cl::desc("Unrolled size limit for loops with an unroll(enable) or "
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"unroll_count pragma."));
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namespace {
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class LoopUnroll : public LoopPass {
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public:
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@ -109,6 +117,66 @@ namespace {
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// For now, recreate dom info, if loop is unrolled.
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AU.addPreserved<DominatorTreeWrapperPass>();
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}
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// Fill in the UnrollingPreferences parameter with values from the
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// TargetTransformationInfo.
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void getUnrollingPreferences(Loop *L, const TargetTransformInfo &TTI,
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TargetTransformInfo::UnrollingPreferences &UP) {
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UP.Threshold = CurrentThreshold;
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UP.OptSizeThreshold = OptSizeUnrollThreshold;
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UP.PartialThreshold = CurrentThreshold;
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UP.PartialOptSizeThreshold = OptSizeUnrollThreshold;
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UP.Count = CurrentCount;
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UP.MaxCount = UINT_MAX;
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UP.Partial = CurrentAllowPartial;
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UP.Runtime = CurrentRuntime;
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TTI.getUnrollingPreferences(L, UP);
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}
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// Select and return an unroll count based on parameters from
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// user, unroll preferences, unroll pragmas, or a heuristic.
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// SetExplicitly is set to true if the unroll count is is set by
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// the user or a pragma rather than selected heuristically.
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unsigned
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selectUnrollCount(const Loop *L, unsigned TripCount, bool HasEnablePragma,
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unsigned PragmaCount,
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const TargetTransformInfo::UnrollingPreferences &UP,
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bool &SetExplicitly);
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// Select threshold values used to limit unrolling based on a
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// total unrolled size. Parameters Threshold and PartialThreshold
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// are set to the maximum unrolled size for fully and partially
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// unrolled loops respectively.
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void selectThresholds(const Loop *L, bool HasPragma,
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const TargetTransformInfo::UnrollingPreferences &UP,
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unsigned &Threshold, unsigned &PartialThreshold) {
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// Determine the current unrolling threshold. While this is
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// normally set from UnrollThreshold, it is overridden to a
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// smaller value if the current function is marked as
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// optimize-for-size, and the unroll threshold was not user
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// specified.
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Threshold = UserThreshold ? CurrentThreshold : UP.Threshold;
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PartialThreshold = UserThreshold ? CurrentThreshold : UP.PartialThreshold;
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if (!UserThreshold &&
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L->getHeader()->getParent()->getAttributes().
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hasAttribute(AttributeSet::FunctionIndex,
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Attribute::OptimizeForSize)) {
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Threshold = UP.OptSizeThreshold;
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PartialThreshold = UP.PartialOptSizeThreshold;
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}
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if (HasPragma) {
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// If the loop has an unrolling pragma, we want to be more
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// aggressive with unrolling limits. Set thresholds to at
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// least the PragmaTheshold value which is larger than the
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// default limits.
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if (Threshold != NoThreshold)
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Threshold = std::max<unsigned>(Threshold, PragmaUnrollThreshold);
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if (PartialThreshold != NoThreshold)
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PartialThreshold =
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std::max<unsigned>(PartialThreshold, PragmaUnrollThreshold);
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}
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}
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};
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}
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@ -151,6 +219,105 @@ static unsigned ApproximateLoopSize(const Loop *L, unsigned &NumCalls,
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return LoopSize;
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}
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// Returns the value associated with the given metadata node name (for
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// example, "llvm.loopunroll.count"). If no such named metadata node
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// exists, then nullptr is returned.
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static const ConstantInt *GetUnrollMetadataValue(const Loop *L,
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StringRef Name) {
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MDNode *LoopID = L->getLoopID();
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if (!LoopID) return nullptr;
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// First operand should refer to the loop id itself.
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assert(LoopID->getNumOperands() > 0 && "requires at least one operand");
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assert(LoopID->getOperand(0) == LoopID && "invalid loop id");
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for (unsigned i = 1, e = LoopID->getNumOperands(); i < e; ++i) {
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const MDNode *MD = dyn_cast<MDNode>(LoopID->getOperand(i));
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if (!MD) continue;
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const MDString *S = dyn_cast<MDString>(MD->getOperand(0));
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if (!S) continue;
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if (Name.equals(S->getString())) {
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assert(MD->getNumOperands() == 2 &&
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"Unroll hint metadata should have two operands.");
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return cast<ConstantInt>(MD->getOperand(1));
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}
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}
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return nullptr;
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}
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// Returns true if the loop has an unroll(enable) pragma.
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static bool HasUnrollEnablePragma(const Loop *L) {
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const ConstantInt *EnableValue =
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GetUnrollMetadataValue(L, "llvm.loopunroll.enable");
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return (EnableValue && EnableValue->getZExtValue());
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return false;
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}
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// Returns true if the loop has an unroll(disable) pragma.
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static bool HasUnrollDisablePragma(const Loop *L) {
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const ConstantInt *EnableValue =
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GetUnrollMetadataValue(L, "llvm.loopunroll.enable");
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return (EnableValue && !EnableValue->getZExtValue());
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return false;
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}
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// If loop has an unroll_count pragma return the (necessarily
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// positive) value from the pragma. Otherwise return 0.
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static unsigned UnrollCountPragmaValue(const Loop *L) {
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const ConstantInt *CountValue =
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GetUnrollMetadataValue(L, "llvm.loopunroll.count");
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if (CountValue) {
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unsigned Count = CountValue->getZExtValue();
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assert(Count >= 1 && "Unroll count must be positive.");
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return Count;
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}
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return 0;
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}
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unsigned LoopUnroll::selectUnrollCount(
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const Loop *L, unsigned TripCount, bool HasEnablePragma,
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unsigned PragmaCount, const TargetTransformInfo::UnrollingPreferences &UP,
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bool &SetExplicitly) {
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SetExplicitly = true;
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// User-specified count (either as a command-line option or
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// constructor parameter) has highest precedence.
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unsigned Count = UserCount ? CurrentCount : 0;
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// If there is no user-specified count, unroll pragmas have the next
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// highest precendence.
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if (Count == 0) {
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if (PragmaCount) {
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Count = PragmaCount;
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} else if (HasEnablePragma) {
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// unroll(enable) pragma without an unroll_count pragma
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// indicates to unroll loop fully.
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Count = TripCount;
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}
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}
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if (Count == 0)
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Count = UP.Count;
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if (Count == 0) {
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SetExplicitly = false;
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if (TripCount == 0)
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// Runtime trip count.
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Count = UnrollRuntimeCount;
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else
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// Conservative heuristic: if we know the trip count, see if we can
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// completely unroll (subject to the threshold, checked below); otherwise
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// try to find greatest modulo of the trip count which is still under
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// threshold value.
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Count = TripCount;
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}
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if (TripCount && Count > TripCount)
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return TripCount;
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return Count;
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}
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bool LoopUnroll::runOnLoop(Loop *L, LPPassManager &LPM) {
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if (skipOptnoneFunction(L))
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return false;
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@ -162,33 +329,16 @@ bool LoopUnroll::runOnLoop(Loop *L, LPPassManager &LPM) {
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BasicBlock *Header = L->getHeader();
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DEBUG(dbgs() << "Loop Unroll: F[" << Header->getParent()->getName()
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<< "] Loop %" << Header->getName() << "\n");
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(void)Header;
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if (HasUnrollDisablePragma(L)) {
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return false;
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}
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bool HasEnablePragma = HasUnrollEnablePragma(L);
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unsigned PragmaCount = UnrollCountPragmaValue(L);
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bool HasPragma = HasEnablePragma || PragmaCount > 0;
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TargetTransformInfo::UnrollingPreferences UP;
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UP.Threshold = CurrentThreshold;
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UP.OptSizeThreshold = OptSizeUnrollThreshold;
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UP.PartialThreshold = CurrentThreshold;
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UP.PartialOptSizeThreshold = OptSizeUnrollThreshold;
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UP.Count = CurrentCount;
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UP.MaxCount = UINT_MAX;
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UP.Partial = CurrentAllowPartial;
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UP.Runtime = CurrentRuntime;
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TTI.getUnrollingPreferences(L, UP);
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// Determine the current unrolling threshold. While this is normally set
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// from UnrollThreshold, it is overridden to a smaller value if the current
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// function is marked as optimize-for-size, and the unroll threshold was
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// not user specified.
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unsigned Threshold = UserThreshold ? CurrentThreshold : UP.Threshold;
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unsigned PartialThreshold =
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UserThreshold ? CurrentThreshold : UP.PartialThreshold;
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if (!UserThreshold &&
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Header->getParent()->getAttributes().
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hasAttribute(AttributeSet::FunctionIndex,
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Attribute::OptimizeForSize)) {
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Threshold = UP.OptSizeThreshold;
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PartialThreshold = UP.PartialOptSizeThreshold;
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}
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getUnrollingPreferences(L, TTI, UP);
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// Find trip count and trip multiple if count is not available
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unsigned TripCount = 0;
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@ -202,79 +352,117 @@ bool LoopUnroll::runOnLoop(Loop *L, LPPassManager &LPM) {
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TripMultiple = SE->getSmallConstantTripMultiple(L, LatchBlock);
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}
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bool Runtime = UserRuntime ? CurrentRuntime : UP.Runtime;
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// Select an initial unroll count. This may be reduced later based
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// on size thresholds.
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bool CountSetExplicitly;
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unsigned Count = selectUnrollCount(L, TripCount, HasEnablePragma, PragmaCount,
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UP, CountSetExplicitly);
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// Use a default unroll-count if the user doesn't specify a value
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// and the trip count is a run-time value. The default is different
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// for run-time or compile-time trip count loops.
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unsigned Count = UserCount ? CurrentCount : UP.Count;
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if (Runtime && Count == 0 && TripCount == 0)
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Count = UnrollRuntimeCount;
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if (Count == 0) {
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// Conservative heuristic: if we know the trip count, see if we can
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// completely unroll (subject to the threshold, checked below); otherwise
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// try to find greatest modulo of the trip count which is still under
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// threshold value.
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if (TripCount == 0)
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return false;
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Count = TripCount;
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unsigned NumInlineCandidates;
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bool notDuplicatable;
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unsigned LoopSize =
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ApproximateLoopSize(L, NumInlineCandidates, notDuplicatable, TTI);
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DEBUG(dbgs() << " Loop Size = " << LoopSize << "\n");
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uint64_t UnrolledSize = (uint64_t)LoopSize * Count;
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if (notDuplicatable) {
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DEBUG(dbgs() << " Not unrolling loop which contains non-duplicatable"
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<< " instructions.\n");
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return false;
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}
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if (NumInlineCandidates != 0) {
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DEBUG(dbgs() << " Not unrolling loop with inlinable calls.\n");
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return false;
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}
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// Enforce the threshold.
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if (Threshold != NoThreshold && PartialThreshold != NoThreshold) {
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unsigned NumInlineCandidates;
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bool notDuplicatable;
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unsigned LoopSize = ApproximateLoopSize(L, NumInlineCandidates,
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notDuplicatable, TTI);
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DEBUG(dbgs() << " Loop Size = " << LoopSize << "\n");
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if (notDuplicatable) {
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DEBUG(dbgs() << " Not unrolling loop which contains non-duplicatable"
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<< " instructions.\n");
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return false;
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}
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if (NumInlineCandidates != 0) {
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DEBUG(dbgs() << " Not unrolling loop with inlinable calls.\n");
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return false;
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}
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uint64_t Size = (uint64_t)LoopSize*Count;
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if (TripCount != 1 &&
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(Size > Threshold || (Count != TripCount && Size > PartialThreshold))) {
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if (Size > Threshold)
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DEBUG(dbgs() << " Too large to fully unroll with count: " << Count
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<< " because size: " << Size << ">" << Threshold << "\n");
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unsigned Threshold, PartialThreshold;
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selectThresholds(L, HasPragma, UP, Threshold, PartialThreshold);
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bool AllowPartial = UserAllowPartial ? CurrentAllowPartial : UP.Partial;
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if (!AllowPartial && !(Runtime && TripCount == 0)) {
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DEBUG(dbgs() << " will not try to unroll partially because "
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<< "-unroll-allow-partial not given\n");
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return false;
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}
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if (TripCount) {
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// Reduce unroll count to be modulo of TripCount for partial unrolling
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Count = PartialThreshold / LoopSize;
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while (Count != 0 && TripCount%Count != 0)
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Count--;
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}
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else if (Runtime) {
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// Reduce unroll count to be a lower power-of-two value
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while (Count != 0 && Size > PartialThreshold) {
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Count >>= 1;
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Size = LoopSize*Count;
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}
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}
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if (Count > UP.MaxCount)
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Count = UP.MaxCount;
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if (Count < 2) {
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DEBUG(dbgs() << " could not unroll partially\n");
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return false;
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}
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DEBUG(dbgs() << " partially unrolling with count: " << Count << "\n");
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// Given Count, TripCount and thresholds determine the type of
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// unrolling which is to be performed.
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enum { Full = 0, Partial = 1, Runtime = 2 };
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int Unrolling;
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if (TripCount && Count == TripCount) {
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if (Threshold != NoThreshold && UnrolledSize > Threshold) {
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DEBUG(dbgs() << " Too large to fully unroll with count: " << Count
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<< " because size: " << UnrolledSize << ">" << Threshold
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<< "\n");
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Unrolling = Partial;
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} else {
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Unrolling = Full;
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}
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} else if (TripCount && Count < TripCount) {
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Unrolling = Partial;
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} else {
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Unrolling = Runtime;
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}
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// Reduce count based on the type of unrolling and the threshold values.
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unsigned OriginalCount = Count;
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bool AllowRuntime = UserRuntime ? CurrentRuntime : UP.Runtime;
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if (Unrolling == Partial) {
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bool AllowPartial = UserAllowPartial ? CurrentAllowPartial : UP.Partial;
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if (!AllowPartial && !CountSetExplicitly) {
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DEBUG(dbgs() << " will not try to unroll partially because "
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<< "-unroll-allow-partial not given\n");
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return false;
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}
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if (PartialThreshold != NoThreshold && UnrolledSize > PartialThreshold) {
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// Reduce unroll count to be modulo of TripCount for partial unrolling.
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Count = PartialThreshold / LoopSize;
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while (Count != 0 && TripCount % Count != 0)
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Count--;
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}
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} else if (Unrolling == Runtime) {
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if (!AllowRuntime && !CountSetExplicitly) {
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DEBUG(dbgs() << " will not try to unroll loop with runtime trip count "
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<< "-unroll-runtime not given\n");
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return false;
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}
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// Reduce unroll count to be the largest power-of-two factor of
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// the original count which satisfies the threshold limit.
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while (Count != 0 && UnrolledSize > PartialThreshold) {
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Count >>= 1;
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UnrolledSize = LoopSize * Count;
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}
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if (Count > UP.MaxCount)
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Count = UP.MaxCount;
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DEBUG(dbgs() << " partially unrolling with count: " << Count << "\n");
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}
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if (HasPragma) {
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// Emit optimization remarks if we are unable to unroll the loop
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// as directed by a pragma.
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DebugLoc LoopLoc = L->getStartLoc();
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Function *F = Header->getParent();
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LLVMContext &Ctx = F->getContext();
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if (HasEnablePragma && PragmaCount == 0) {
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if (TripCount && Count != TripCount) {
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emitOptimizationRemarkMissed(
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Ctx, DEBUG_TYPE, *F, LoopLoc,
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"Unable to fully unroll loop as directed by unroll(enable) pragma "
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"because unrolled size is too large.");
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} else if (!TripCount) {
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emitOptimizationRemarkMissed(
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Ctx, DEBUG_TYPE, *F, LoopLoc,
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"Unable to fully unroll loop as directed by unroll(enable) pragma "
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"because loop has a runtime trip count.");
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}
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} else if (PragmaCount > 0 && Count != OriginalCount) {
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emitOptimizationRemarkMissed(
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Ctx, DEBUG_TYPE, *F, LoopLoc,
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"Unable to unroll loop the number of times directed by "
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"unroll_count pragma because unrolled size is too large.");
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}
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}
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if (Unrolling != Full && Count < 2) {
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// Partial unrolling by 1 is a nop. For full unrolling, a factor
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// of 1 makes sense because loop control can be eliminated.
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return false;
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}
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// Unroll the loop.
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if (!UnrollLoop(L, Count, TripCount, Runtime, TripMultiple, LI, this, &LPM))
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if (!UnrollLoop(L, Count, TripCount, AllowRuntime, TripMultiple, LI, this, &LPM))
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return false;
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return true;
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285
test/Transforms/LoopUnroll/unroll-pragmas.ll
Normal file
285
test/Transforms/LoopUnroll/unroll-pragmas.ll
Normal file
@ -0,0 +1,285 @@
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; RUN: opt < %s -loop-unroll -S | FileCheck %s
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux-gnu"
|
||||
|
||||
; loop4 contains a small loop which should be completely unrolled by
|
||||
; the default unrolling heuristics. It serves as a control for the
|
||||
; unroll(disable) pragma test loop4_with_disable.
|
||||
;
|
||||
; CHECK-LABEL: @loop4(
|
||||
; CHECK-NOT: br i1
|
||||
define void @loop4(i32* nocapture %a) {
|
||||
entry:
|
||||
br label %for.body
|
||||
|
||||
for.body: ; preds = %for.body, %entry
|
||||
%indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
|
||||
%arrayidx = getelementptr inbounds i32* %a, i64 %indvars.iv
|
||||
%0 = load i32* %arrayidx, align 4
|
||||
%inc = add nsw i32 %0, 1
|
||||
store i32 %inc, i32* %arrayidx, align 4
|
||||
%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
|
||||
%exitcond = icmp eq i64 %indvars.iv.next, 4
|
||||
br i1 %exitcond, label %for.end, label %for.body
|
||||
|
||||
for.end: ; preds = %for.body
|
||||
ret void
|
||||
}
|
||||
|
||||
; #pragma clang loop unroll(disable)
|
||||
;
|
||||
; CHECK-LABEL: @loop4_with_disable(
|
||||
; CHECK: store i32
|
||||
; CHECK-NOT: store i32
|
||||
; CHECK: br i1
|
||||
define void @loop4_with_disable(i32* nocapture %a) {
|
||||
entry:
|
||||
br label %for.body
|
||||
|
||||
for.body: ; preds = %for.body, %entry
|
||||
%indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
|
||||
%arrayidx = getelementptr inbounds i32* %a, i64 %indvars.iv
|
||||
%0 = load i32* %arrayidx, align 4
|
||||
%inc = add nsw i32 %0, 1
|
||||
store i32 %inc, i32* %arrayidx, align 4
|
||||
%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
|
||||
%exitcond = icmp eq i64 %indvars.iv.next, 4
|
||||
br i1 %exitcond, label %for.end, label %for.body, !llvm.loop !1
|
||||
|
||||
for.end: ; preds = %for.body
|
||||
ret void
|
||||
}
|
||||
!1 = metadata !{metadata !1, metadata !2}
|
||||
!2 = metadata !{metadata !"llvm.loopunroll.enable", i1 false}
|
||||
|
||||
; loop64 has a high enough count that it should *not* be unrolled by
|
||||
; the default unrolling heuristic. It serves as the control for the
|
||||
; unroll(enable) pragma test loop64_with_.* tests below.
|
||||
;
|
||||
; CHECK-LABEL: @loop64(
|
||||
; CHECK: store i32
|
||||
; CHECK-NOT: store i32
|
||||
; CHECK: br i1
|
||||
define void @loop64(i32* nocapture %a) {
|
||||
entry:
|
||||
br label %for.body
|
||||
|
||||
for.body: ; preds = %for.body, %entry
|
||||
%indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
|
||||
%arrayidx = getelementptr inbounds i32* %a, i64 %indvars.iv
|
||||
%0 = load i32* %arrayidx, align 4
|
||||
%inc = add nsw i32 %0, 1
|
||||
store i32 %inc, i32* %arrayidx, align 4
|
||||
%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
|
||||
%exitcond = icmp eq i64 %indvars.iv.next, 64
|
||||
br i1 %exitcond, label %for.end, label %for.body
|
||||
|
||||
for.end: ; preds = %for.body
|
||||
ret void
|
||||
}
|
||||
|
||||
; #pragma clang loop unroll(enable)
|
||||
; Loop should be fully unrolled.
|
||||
;
|
||||
; CHECK-LABEL: @loop64_with_enable(
|
||||
; CHECK-NOT: br i1
|
||||
define void @loop64_with_enable(i32* nocapture %a) {
|
||||
entry:
|
||||
br label %for.body
|
||||
|
||||
for.body: ; preds = %for.body, %entry
|
||||
%indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
|
||||
%arrayidx = getelementptr inbounds i32* %a, i64 %indvars.iv
|
||||
%0 = load i32* %arrayidx, align 4
|
||||
%inc = add nsw i32 %0, 1
|
||||
store i32 %inc, i32* %arrayidx, align 4
|
||||
%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
|
||||
%exitcond = icmp eq i64 %indvars.iv.next, 64
|
||||
br i1 %exitcond, label %for.end, label %for.body, !llvm.loop !3
|
||||
|
||||
for.end: ; preds = %for.body
|
||||
ret void
|
||||
}
|
||||
!3 = metadata !{metadata !3, metadata !4}
|
||||
!4 = metadata !{metadata !"llvm.loopunroll.enable", i1 true}
|
||||
|
||||
; #pragma clang loop unroll_count(4)
|
||||
; Loop should be unrolled 4 times.
|
||||
;
|
||||
; CHECK-LABEL: @loop64_with_count4(
|
||||
; CHECK: store i32
|
||||
; CHECK: store i32
|
||||
; CHECK: store i32
|
||||
; CHECK: store i32
|
||||
; CHECK-NOT: store i32
|
||||
; CHECK: br i1
|
||||
define void @loop64_with_count4(i32* nocapture %a) {
|
||||
entry:
|
||||
br label %for.body
|
||||
|
||||
for.body: ; preds = %for.body, %entry
|
||||
%indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
|
||||
%arrayidx = getelementptr inbounds i32* %a, i64 %indvars.iv
|
||||
%0 = load i32* %arrayidx, align 4
|
||||
%inc = add nsw i32 %0, 1
|
||||
store i32 %inc, i32* %arrayidx, align 4
|
||||
%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
|
||||
%exitcond = icmp eq i64 %indvars.iv.next, 64
|
||||
br i1 %exitcond, label %for.end, label %for.body, !llvm.loop !5
|
||||
|
||||
for.end: ; preds = %for.body
|
||||
ret void
|
||||
}
|
||||
!5 = metadata !{metadata !5, metadata !6}
|
||||
!6 = metadata !{metadata !"llvm.loopunroll.count", i32 4}
|
||||
|
||||
|
||||
; #pragma clang loop unroll_count(enable) unroll_count(4)
|
||||
; Loop should be unrolled 4 times.
|
||||
;
|
||||
; CHECK-LABEL: @loop64_with_enable_and_count4(
|
||||
; CHECK: store i32
|
||||
; CHECK: store i32
|
||||
; CHECK: store i32
|
||||
; CHECK: store i32
|
||||
; CHECK-NOT: store i32
|
||||
; CHECK: br i1
|
||||
define void @loop64_with_enable_and_count4(i32* nocapture %a) {
|
||||
entry:
|
||||
br label %for.body
|
||||
|
||||
for.body: ; preds = %for.body, %entry
|
||||
%indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
|
||||
%arrayidx = getelementptr inbounds i32* %a, i64 %indvars.iv
|
||||
%0 = load i32* %arrayidx, align 4
|
||||
%inc = add nsw i32 %0, 1
|
||||
store i32 %inc, i32* %arrayidx, align 4
|
||||
%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
|
||||
%exitcond = icmp eq i64 %indvars.iv.next, 64
|
||||
br i1 %exitcond, label %for.end, label %for.body, !llvm.loop !7
|
||||
|
||||
for.end: ; preds = %for.body
|
||||
ret void
|
||||
}
|
||||
!7 = metadata !{metadata !7, metadata !6, metadata !4}
|
||||
|
||||
; #pragma clang loop unroll_count(enable)
|
||||
; Full unrolling is requested, but loop has a dynamic trip count so
|
||||
; no unrolling should occur.
|
||||
;
|
||||
; CHECK-LABEL: @dynamic_loop_with_enable(
|
||||
; CHECK: store i32
|
||||
; CHECK-NOT: store i32
|
||||
; CHECK: br i1
|
||||
define void @dynamic_loop_with_enable(i32* nocapture %a, i32 %b) {
|
||||
entry:
|
||||
%cmp3 = icmp sgt i32 %b, 0
|
||||
br i1 %cmp3, label %for.body, label %for.end, !llvm.loop !8
|
||||
|
||||
for.body: ; preds = %entry, %for.body
|
||||
%indvars.iv = phi i64 [ %indvars.iv.next, %for.body ], [ 0, %entry ]
|
||||
%arrayidx = getelementptr inbounds i32* %a, i64 %indvars.iv
|
||||
%0 = load i32* %arrayidx, align 4
|
||||
%inc = add nsw i32 %0, 1
|
||||
store i32 %inc, i32* %arrayidx, align 4
|
||||
%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
|
||||
%lftr.wideiv = trunc i64 %indvars.iv.next to i32
|
||||
%exitcond = icmp eq i32 %lftr.wideiv, %b
|
||||
br i1 %exitcond, label %for.end, label %for.body, !llvm.loop !8
|
||||
|
||||
for.end: ; preds = %for.body, %entry
|
||||
ret void
|
||||
}
|
||||
!8 = metadata !{metadata !8, metadata !4}
|
||||
|
||||
; #pragma clang loop unroll_count(4)
|
||||
; Loop has a dynamic trip count. Unrolling should occur, but no
|
||||
; conditional branches can be removed.
|
||||
;
|
||||
; CHECK-LABEL: @dynamic_loop_with_count4(
|
||||
; CHECK-NOT: store
|
||||
; CHECK: br i1
|
||||
; CHECK: store
|
||||
; CHECK: br i1
|
||||
; CHECK: store
|
||||
; CHECK: br i1
|
||||
; CHECK: store
|
||||
; CHECK: br i1
|
||||
; CHECK: store
|
||||
; CHECK: br i1
|
||||
; CHECK-NOT: br i1
|
||||
define void @dynamic_loop_with_count4(i32* nocapture %a, i32 %b) {
|
||||
entry:
|
||||
%cmp3 = icmp sgt i32 %b, 0
|
||||
br i1 %cmp3, label %for.body, label %for.end, !llvm.loop !9
|
||||
|
||||
for.body: ; preds = %entry, %for.body
|
||||
%indvars.iv = phi i64 [ %indvars.iv.next, %for.body ], [ 0, %entry ]
|
||||
%arrayidx = getelementptr inbounds i32* %a, i64 %indvars.iv
|
||||
%0 = load i32* %arrayidx, align 4
|
||||
%inc = add nsw i32 %0, 1
|
||||
store i32 %inc, i32* %arrayidx, align 4
|
||||
%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
|
||||
%lftr.wideiv = trunc i64 %indvars.iv.next to i32
|
||||
%exitcond = icmp eq i32 %lftr.wideiv, %b
|
||||
br i1 %exitcond, label %for.end, label %for.body, !llvm.loop !9
|
||||
|
||||
for.end: ; preds = %for.body, %entry
|
||||
ret void
|
||||
}
|
||||
!9 = metadata !{metadata !9, metadata !6}
|
||||
|
||||
; #pragma clang loop unroll_count(1)
|
||||
; Loop should not be unrolled
|
||||
;
|
||||
; CHECK-LABEL: @unroll_1(
|
||||
; CHECK: store i32
|
||||
; CHECK-NOT: store i32
|
||||
; CHECK: br i1
|
||||
define void @unroll_1(i32* nocapture %a, i32 %b) {
|
||||
entry:
|
||||
br label %for.body
|
||||
|
||||
for.body: ; preds = %for.body, %entry
|
||||
%indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
|
||||
%arrayidx = getelementptr inbounds i32* %a, i64 %indvars.iv
|
||||
%0 = load i32* %arrayidx, align 4
|
||||
%inc = add nsw i32 %0, 1
|
||||
store i32 %inc, i32* %arrayidx, align 4
|
||||
%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
|
||||
%exitcond = icmp eq i64 %indvars.iv.next, 4
|
||||
br i1 %exitcond, label %for.end, label %for.body, !llvm.loop !10
|
||||
|
||||
for.end: ; preds = %for.body
|
||||
ret void
|
||||
}
|
||||
!10 = metadata !{metadata !10, metadata !11}
|
||||
!11 = metadata !{metadata !"llvm.loopunroll.count", i32 1}
|
||||
|
||||
; #pragma clang loop unroll(enable)
|
||||
; Loop has very high loop count (1 million) and full unrolling was requested.
|
||||
; Loop should unrolled up to the pragma threshold, but not completely.
|
||||
;
|
||||
; CHECK-LABEL: @unroll_1M(
|
||||
; CHECK: store i32
|
||||
; CHECK: store i32
|
||||
; CHECK: br i1
|
||||
define void @unroll_1M(i32* nocapture %a, i32 %b) {
|
||||
entry:
|
||||
br label %for.body
|
||||
|
||||
for.body: ; preds = %for.body, %entry
|
||||
%indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
|
||||
%arrayidx = getelementptr inbounds i32* %a, i64 %indvars.iv
|
||||
%0 = load i32* %arrayidx, align 4
|
||||
%inc = add nsw i32 %0, 1
|
||||
store i32 %inc, i32* %arrayidx, align 4
|
||||
%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
|
||||
%exitcond = icmp eq i64 %indvars.iv.next, 1000000
|
||||
br i1 %exitcond, label %for.end, label %for.body, !llvm.loop !12
|
||||
|
||||
for.end: ; preds = %for.body
|
||||
ret void
|
||||
}
|
||||
!12 = metadata !{metadata !12, metadata !4}
|
||||
Loading…
Reference in New Issue
Block a user