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https://github.com/RPCS3/llvm-mirror.git
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Follow-up patch of http://reviews.llvm.org/D19948 to handle missing profiles when simplifying CFG.
Summary: Set default branch weight to 1:1 if one of the branch has profile missing when simplifying CFG. Reviewers: spatel, davidxl Subscribers: danielcdh, llvm-commits Differential Revision: http://reviews.llvm.org/D20307 llvm-svn: 269995
This commit is contained in:
Dehao Chen
parent
93eb34a12b
commit
7cac814db8
@ -2094,6 +2094,29 @@ static bool checkCSEInPredecessor(Instruction *Inst, BasicBlock *PB) {
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return false;
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}
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/// Return true if either PBI or BI has branch weight available, and store
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/// the weights in {Pred|Succ}{True|False}Weight. If one of PBI and BI does
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/// not have branch weight, use 1:1 as its weight.
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static bool extractPredSuccWeights(BranchInst *PBI, BranchInst *BI,
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uint64_t &PredTrueWeight,
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uint64_t &PredFalseWeight,
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uint64_t &SuccTrueWeight,
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uint64_t &SuccFalseWeight) {
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bool PredHasWeights =
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PBI->extractProfMetadata(PredTrueWeight, PredFalseWeight);
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bool SuccHasWeights =
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BI->extractProfMetadata(SuccTrueWeight, SuccFalseWeight);
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if (PredHasWeights || SuccHasWeights) {
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if (!PredHasWeights)
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PredTrueWeight = PredFalseWeight = 1;
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if (!SuccHasWeights)
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SuccTrueWeight = SuccFalseWeight = 1;
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return true;
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} else {
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return false;
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}
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}
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/// If this basic block is simple enough, and if a predecessor branches to us
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/// and one of our successors, fold the block into the predecessor and use
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/// logical operations to pick the right destination.
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@ -2281,14 +2304,13 @@ bool llvm::FoldBranchToCommonDest(BranchInst *BI, unsigned BonusInstThreshold) {
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PBI->setCondition(NewCond);
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uint64_t PredTrueWeight, PredFalseWeight, SuccTrueWeight, SuccFalseWeight;
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bool PredHasWeights =
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PBI->extractProfMetadata(PredTrueWeight, PredFalseWeight);
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bool SuccHasWeights =
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BI->extractProfMetadata(SuccTrueWeight, SuccFalseWeight);
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bool HasWeights =
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extractPredSuccWeights(PBI, BI, PredTrueWeight, PredFalseWeight,
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SuccTrueWeight, SuccFalseWeight);
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SmallVector<uint64_t, 8> NewWeights;
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if (PBI->getSuccessor(0) == BB) {
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if (PredHasWeights && SuccHasWeights) {
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if (HasWeights) {
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// PBI: br i1 %x, BB, FalseDest
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// BI: br i1 %y, TrueDest, FalseDest
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// TrueWeight is TrueWeight for PBI * TrueWeight for BI.
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@ -2305,7 +2327,7 @@ bool llvm::FoldBranchToCommonDest(BranchInst *BI, unsigned BonusInstThreshold) {
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PBI->setSuccessor(0, TrueDest);
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}
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if (PBI->getSuccessor(1) == BB) {
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if (PredHasWeights && SuccHasWeights) {
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if (HasWeights) {
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// PBI: br i1 %x, TrueDest, BB
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// BI: br i1 %y, TrueDest, FalseDest
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// TrueWeight is TrueWeight for PBI * TotalWeight for BI +
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@ -2840,18 +2862,10 @@ static bool SimplifyCondBranchToCondBranch(BranchInst *PBI, BranchInst *BI,
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// Update branch weight for PBI.
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uint64_t PredTrueWeight, PredFalseWeight, SuccTrueWeight, SuccFalseWeight;
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uint64_t PredCommon, PredOther, SuccCommon, SuccOther;
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bool PredHasWeights =
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PBI->extractProfMetadata(PredTrueWeight, PredFalseWeight);
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bool SuccHasWeights =
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BI->extractProfMetadata(SuccTrueWeight, SuccFalseWeight);
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bool HasWeights = PredHasWeights || SuccHasWeights;
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bool HasWeights =
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extractPredSuccWeights(PBI, BI, PredTrueWeight, PredFalseWeight,
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SuccTrueWeight, SuccFalseWeight);
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if (HasWeights) {
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if (!PredHasWeights) {
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PredFalseWeight = PredTrueWeight = 1;
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}
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if (!SuccHasWeights) {
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SuccFalseWeight = SuccTrueWeight = 1;
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}
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PredCommon = PBIOp ? PredFalseWeight : PredTrueWeight;
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PredOther = PBIOp ? PredTrueWeight : PredFalseWeight;
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SuccCommon = BIOp ? SuccFalseWeight : SuccTrueWeight;
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@ -2893,7 +2907,7 @@ static bool SimplifyCondBranchToCondBranch(BranchInst *PBI, BranchInst *BI,
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// weights for PBI do not apply to the new select because the select's
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// 'logical' edges are incoming edges of the phi that is eliminated, not
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// the outgoing edges of PBI.
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if (PredHasWeights && SuccHasWeights) {
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if (HasWeights) {
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uint64_t PredCommon = PBIOp ? PredFalseWeight : PredTrueWeight;
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uint64_t PredOther = PBIOp ? PredTrueWeight : PredFalseWeight;
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uint64_t SuccCommon = BIOp ? SuccFalseWeight : SuccTrueWeight;
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@ -29,8 +29,7 @@ define void @fake_weights(i1 %a, i1 %b) {
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entry:
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br i1 %a, label %Y, label %X, !prof !12
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; CHECK: %or.cond = and i1 %a.not, %c
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; CHECK-NEXT: br i1 %or.cond, label %Z, label %Y
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; CHECK-NOT: !prof !0
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; CHECK-NEXT: br i1 %or.cond, label %Z, label %Y, !prof !1
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; CHECK: Y:
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X:
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%c = or i1 %b, false
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@ -49,7 +48,7 @@ define void @test2(i1 %a, i1 %b) {
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; CHECK-LABEL: @test2(
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entry:
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br i1 %a, label %X, label %Y, !prof !1
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; CHECK: br i1 %or.cond, label %Z, label %Y, !prof !1
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; CHECK: br i1 %or.cond, label %Z, label %Y, !prof !2
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; CHECK-NOT: !prof
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X:
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@ -67,7 +66,7 @@ Z:
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define void @test3(i1 %a, i1 %b) {
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; CHECK-LABEL: @test3(
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; CHECK-NOT: !prof
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; CHECK: br i1 %or.cond, label %Z, label %Y, !prof !1
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entry:
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br i1 %a, label %X, label %Y, !prof !1
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@ -86,7 +85,7 @@ Z:
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define void @test4(i1 %a, i1 %b) {
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; CHECK-LABEL: @test4(
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; CHECK-NOT: !prof
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; CHECK: br i1 %or.cond, label %Z, label %Y, !prof !1
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entry:
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br i1 %a, label %X, label %Y
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@ -115,7 +114,7 @@ entry:
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; CHECK: switch i32 %N, label %sw2 [
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; CHECK: i32 3, label %sw.bb1
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; CHECK: i32 2, label %sw.bb
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; CHECK: ], !prof !2
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; CHECK: ], !prof !3
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sw.bb:
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call void @helper(i32 0)
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@ -148,7 +147,7 @@ entry:
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; CHECK: i32 3, label %sw.bb1
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; CHECK: i32 2, label %sw.bb
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; CHECK: i32 4, label %sw.bb5
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; CHECK: ], !prof !3
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; CHECK: ], !prof !4
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sw.bb:
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call void @helper(i32 0)
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@ -183,7 +182,7 @@ define void @test1_swap(i1 %a, i1 %b) {
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; CHECK-LABEL: @test1_swap(
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entry:
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br i1 %a, label %Y, label %X, !prof !0
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; CHECK: br i1 %or.cond, label %Y, label %Z, !prof !4
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; CHECK: br i1 %or.cond, label %Y, label %Z, !prof !5
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X:
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%c = or i1 %b, false
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@ -203,7 +202,7 @@ define void @test7(i1 %a, i1 %b) {
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entry:
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%c = or i1 %b, false
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br i1 %a, label %Y, label %X, !prof !0
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; CHECK: br i1 %brmerge, label %Y, label %Z, !prof !5
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; CHECK: br i1 %brmerge, label %Y, label %Z, !prof !6
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X:
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br i1 %c, label %Y, label %Z, !prof !6
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@ -222,7 +221,7 @@ define void @test8(i64 %x, i64 %y) nounwind {
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; CHECK-LABEL: @test8(
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entry:
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%lt = icmp slt i64 %x, %y
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; CHECK: br i1 %lt, label %a, label %b, !prof !6
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; CHECK: br i1 %lt, label %a, label %b, !prof !7
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%qux = select i1 %lt, i32 0, i32 2
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switch i32 %qux, label %bees [
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i32 0, label %a
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@ -255,7 +254,7 @@ entry:
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; CHECK: i32 1, label %end
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; CHECK: i32 2, label %end
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; CHECK: i32 92, label %end
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; CHECK: ], !prof !7
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; CHECK: ], !prof !8
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a:
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call void @helper(i32 0) nounwind
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@ -293,7 +292,7 @@ lor.end:
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; CHECK-LABEL: @test10(
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; CHECK: %x.off = add i32 %x, -1
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; CHECK: %switch = icmp ult i32 %x.off, 3
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; CHECK: br i1 %switch, label %lor.end, label %lor.rhs, !prof !8
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; CHECK: br i1 %switch, label %lor.end, label %lor.rhs, !prof !9
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}
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; Remove dead cases from the switch.
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@ -305,7 +304,7 @@ define void @test11(i32 %x) nounwind {
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], !prof !8
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; CHECK-LABEL: @test11(
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; CHECK: %cond = icmp eq i32 %i, 24
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; CHECK: br i1 %cond, label %c, label %a, !prof !9
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; CHECK: br i1 %cond, label %c, label %a, !prof !10
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a:
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call void @helper(i32 0) nounwind
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@ -368,7 +367,7 @@ c:
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@max_regno = common global i32 0, align 4
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define void @test14(i32* %old, i32 %final) {
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; CHECK-LABEL: @test14
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; CHECK: br i1 %or.cond, label %for.exit, label %for.inc, !prof !10
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; CHECK: br i1 %or.cond, label %for.exit, label %for.inc, !prof !11
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for.cond:
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br label %for.cond2
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for.cond2:
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@ -394,7 +393,7 @@ define i32 @HoistThenElseCodeToIf(i32 %n) {
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; CHECK-LABEL: @HoistThenElseCodeToIf(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[TOBOOL:%.*]] = icmp eq i32 %n, 0
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; CHECK-NEXT: [[DOT:%.*]] = select i1 [[TOBOOL]], i32 1, i32 234, !prof !11
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; CHECK-NEXT: [[DOT:%.*]] = select i1 [[TOBOOL]], i32 1, i32 234, !prof !12
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; CHECK-NEXT: ret i32 [[DOT]]
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;
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entry:
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@ -418,8 +417,8 @@ define i32 @SimplifyCondBranchToCondBranch(i1 %cmpa, i1 %cmpb) {
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; CHECK-LABEL: @SimplifyCondBranchToCondBranch(
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; CHECK-NEXT: block1:
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; CHECK-NEXT: [[BRMERGE:%.*]] = or i1 %cmpa, %cmpb
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; CHECK-NEXT: [[DOTMUX:%.*]] = select i1 %cmpa, i32 0, i32 2, !prof !12
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; CHECK-NEXT: [[OUTVAL:%.*]] = select i1 [[BRMERGE]], i32 [[DOTMUX]], i32 1, !prof !13
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; CHECK-NEXT: [[DOTMUX:%.*]] = select i1 %cmpa, i32 0, i32 2, !prof !13
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; CHECK-NEXT: [[OUTVAL:%.*]] = select i1 [[BRMERGE]], i32 [[DOTMUX]], i32 1, !prof !14
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; CHECK-NEXT: ret i32 [[OUTVAL]]
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;
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block1:
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@ -445,8 +444,8 @@ define i32 @SimplifyCondBranchToCondBranchSwap(i1 %cmpa, i1 %cmpb) {
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; CHECK-NEXT: [[CMPA_NOT:%.*]] = xor i1 %cmpa, true
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; CHECK-NEXT: [[CMPB_NOT:%.*]] = xor i1 %cmpb, true
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; CHECK-NEXT: [[BRMERGE:%.*]] = or i1 [[CMPA_NOT]], [[CMPB_NOT]]
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; CHECK-NEXT: [[DOTMUX:%.*]] = select i1 [[CMPA_NOT]], i32 0, i32 2, !prof !14
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; CHECK-NEXT: [[OUTVAL:%.*]] = select i1 [[BRMERGE]], i32 [[DOTMUX]], i32 1, !prof !15
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; CHECK-NEXT: [[DOTMUX:%.*]] = select i1 [[CMPA_NOT]], i32 0, i32 2, !prof !15
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; CHECK-NEXT: [[OUTVAL:%.*]] = select i1 [[BRMERGE]], i32 [[DOTMUX]], i32 1, !prof !16
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; CHECK-NEXT: ret i32 [[OUTVAL]]
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;
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block1:
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@ -470,8 +469,8 @@ define i32 @SimplifyCondBranchToCondBranchSwapMissingWeight(i1 %cmpa, i1 %cmpb)
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; CHECK-NEXT: [[CMPA_NOT:%.*]] = xor i1 %cmpa, true
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; CHECK-NEXT: [[CMPB_NOT:%.*]] = xor i1 %cmpb, true
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; CHECK-NEXT: [[BRMERGE:%.*]] = or i1 [[CMPA_NOT]], [[CMPB_NOT]]
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; CHECK-NEXT: [[DOTMUX:%.*]] = select i1 [[CMPA_NOT]], i32 0, i32 2
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; CHECK-NEXT: [[OUTVAL:%.*]] = select i1 [[BRMERGE]], i32 [[DOTMUX]], i32 1, !prof !16
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; CHECK-NEXT: [[DOTMUX:%.*]] = select i1 [[CMPA_NOT]], i32 0, i32 2, !prof !17
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; CHECK-NEXT: [[OUTVAL:%.*]] = select i1 [[BRMERGE]], i32 [[DOTMUX]], i32 1, !prof !18
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; CHECK-NEXT: ret i32 [[OUTVAL]]
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;
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block1:
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@ -506,21 +505,23 @@ exit:
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!14 = !{!"branch_weights", i32 4, i32 7}
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; CHECK: !0 = !{!"branch_weights", i32 5, i32 11}
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; CHECK: !1 = !{!"branch_weights", i32 1, i32 5}
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; CHECK: !2 = !{!"branch_weights", i32 7, i32 1, i32 2}
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; CHECK: !3 = !{!"branch_weights", i32 49, i32 12, i32 24, i32 35}
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; CHECK: !4 = !{!"branch_weights", i32 11, i32 5}
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; CHECK: !5 = !{!"branch_weights", i32 17, i32 15}
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; CHECK: !6 = !{!"branch_weights", i32 9, i32 7}
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; CHECK: !7 = !{!"branch_weights", i32 17, i32 9, i32 8, i32 7, i32 17}
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; CHECK: !8 = !{!"branch_weights", i32 24, i32 33}
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; CHECK: !9 = !{!"branch_weights", i32 8, i32 33}
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; CHECK: !1 = !{!"branch_weights", i32 1, i32 3}
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; CHECK: !2 = !{!"branch_weights", i32 1, i32 5}
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; CHECK: !3 = !{!"branch_weights", i32 7, i32 1, i32 2}
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; CHECK: !4 = !{!"branch_weights", i32 49, i32 12, i32 24, i32 35}
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; CHECK: !5 = !{!"branch_weights", i32 11, i32 5}
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; CHECK: !6 = !{!"branch_weights", i32 17, i32 15}
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; CHECK: !7 = !{!"branch_weights", i32 9, i32 7}
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; CHECK: !8 = !{!"branch_weights", i32 17, i32 9, i32 8, i32 7, i32 17}
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; CHECK: !9 = !{!"branch_weights", i32 24, i32 33}
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; CHECK: !10 = !{!"branch_weights", i32 8, i32 33}
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;; The false weight prints out as a negative integer here, but inside llvm, we
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;; treat the weight as an unsigned integer.
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; CHECK: !10 = !{!"branch_weights", i32 112017436, i32 -735157296}
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; CHECK: !11 = !{!"branch_weights", i32 3, i32 5}
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; CHECK: !12 = !{!"branch_weights", i32 22, i32 12}
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; CHECK: !13 = !{!"branch_weights", i32 34, i32 21}
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; CHECK: !14 = !{!"branch_weights", i32 33, i32 14}
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; CHECK: !15 = !{!"branch_weights", i32 47, i32 8}
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; CHECK: !16 = !{!"branch_weights", i32 8, i32 2}
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; CHECK: !11 = !{!"branch_weights", i32 112017436, i32 -735157296}
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; CHECK: !12 = !{!"branch_weights", i32 3, i32 5}
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; CHECK: !13 = !{!"branch_weights", i32 22, i32 12}
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; CHECK: !14 = !{!"branch_weights", i32 34, i32 21}
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; CHECK: !15 = !{!"branch_weights", i32 33, i32 14}
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; CHECK: !16 = !{!"branch_weights", i32 47, i32 8}
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; CHECK: !17 = !{!"branch_weights", i32 6, i32 2}
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; CHECK: !18 = !{!"branch_weights", i32 8, i32 2}
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