diff --git a/llvm/test/Transforms/LoopPredication/preserve-bpi.ll b/llvm/test/Transforms/LoopPredication/preserve-bpi.ll new file mode 100644 index 000000000000..954caef6f746 --- /dev/null +++ b/llvm/test/Transforms/LoopPredication/preserve-bpi.ll @@ -0,0 +1,70 @@ +; RUN: opt -passes='require,require,loop-mssa(loop-predication,licm,simple-loop-unswitch,loop-simplifycfg)' -debug-pass-manager -debug-only=branch-prob -S < %s 2>&1 | FileCheck %s + +; REQUIRES: asserts + +declare void @llvm.experimental.guard(i1, ...) + +; CHECK: Running analysis: ScalarEvolutionAnalysis on unsigned_loop_0_to_n_ult_check +; CHECK-NEXT: Running analysis: TargetLibraryAnalysis on unsigned_loop_0_to_n_ult_check +; CHECK-NEXT: Running analysis: AssumptionAnalysis on unsigned_loop_0_to_n_ult_check +; CHECK-NEXT: Running analysis: DominatorTreeAnalysis on unsigned_loop_0_to_n_ult_check +; CHECK-NEXT: Running analysis: LoopAnalysis on unsigned_loop_0_to_n_ult_check +; CHECK-NEXT: Running pass: RequireAnalysisPass on unsigned_loop_0_to_n_ult_check +; CHECK-NEXT: Running analysis: BranchProbabilityAnalysis on unsigned_loop_0_to_n_ult_check +; CHECK-NEXT: Running analysis: PostDominatorTreeAnalysis on unsigned_loop_0_to_n_ult_check +; CHECK-NEXT: ---- Branch Probability Info : unsigned_loop_0_to_n_ult_check ---- +; CHECK: Running pass: LoopSimplifyPass on unsigned_loop_0_to_n_ult_check +; CHECK: Running pass: LoopPredicationPass on Loop at depth 1 +; CHECK-NEXT: ---- Branch Probability Info : unsigned_loop_0_to_n_ult_check ---- +; CHECK: Running pass: LICMPass on Loop at depth 1 +; CHECK-NEXT: Running pass: SimpleLoopUnswitchPass on Loop at depth 1 +; CHECK-NEXT: Running pass: LoopPredicationPass on Loop at depth 1 +; CHECK-NEXT: ---- Branch Probability Info : unsigned_loop_0_to_n_ult_check ---- +; CHECK: Running pass: LICMPass on Loop at depth 1 +; CHECK-NEXT: Running pass: SimpleLoopUnswitchPass on Loop at depth 1 +; CHECK-NEXT: Running pass: LoopSimplifyCFGPass on Loop at depth 1 +; CHECK-NEXT: Invalidating analysis: BranchProbabilityAnalysis on unsigned_loop_0_to_n_ult_check + + +define i32 @unsigned_loop_0_to_n_ult_check(i32* %array, i32 %length, i32 %n) { +entry: + %tmp5 = icmp eq i32 %n, 0 + br i1 %tmp5, label %exit, label %loop.preheader + +loop.preheader: ; preds = %entry + br label %loop + +loop: ; preds = %guarded, %loop.preheader + %loop.acc = phi i32 [ %loop.acc.next, %guarded ], [ 0, %loop.preheader ] + %i = phi i32 [ %i.next, %guarded ], [ 0, %loop.preheader ] + %within.bounds = icmp ult i32 %i, %length + %widenable_cond = call i1 @llvm.experimental.widenable.condition() + %exiplicit_guard_cond = and i1 %within.bounds, %widenable_cond + br i1 %exiplicit_guard_cond, label %guarded, label %deopt, !prof !0 + +deopt: ; preds = %loop + %deoptcall = call i32 (...) @llvm.experimental.deoptimize.i32(i32 9) [ "deopt"() ] + ret i32 %deoptcall + +guarded: ; preds = %loop + %i.i64 = zext i32 %i to i64 + %array.i.ptr = getelementptr inbounds i32, i32* %array, i64 %i.i64 + %array.i = load i32, i32* %array.i.ptr, align 4 + %loop.acc.next = add i32 %loop.acc, %array.i + %i.next = add nuw i32 %i, 1 + %continue = icmp ult i32 %i.next, %n + br i1 %continue, label %loop, label %exit, !prof !2 + +exit: ; preds = %guarded, %entry + %result = phi i32 [ 0, %entry ], [ %loop.acc.next, %guarded ] + ret i32 %result +} + +declare i32 @llvm.experimental.deoptimize.i32(...) +declare i1 @llvm.experimental.widenable.condition() #0 + +attributes #0 = { inaccessiblememonly nounwind } + +!0 = !{!"branch_weights", i32 1048576, i32 1} +!1 = !{i32 1, i32 -2147483648} +!2 = !{!"branch_weights", i32 1024, i32 1}