Index: llvm/lib/CodeGen/MachinePipeliner.cpp =================================================================== --- llvm/lib/CodeGen/MachinePipeliner.cpp +++ llvm/lib/CodeGen/MachinePipeliner.cpp @@ -290,6 +290,9 @@ if (S == nullptr) continue; + // Reset the pragma for the next loop in iteration. + disabledByPragma = false; + if (S->getString() == "llvm.loop.pipeline.initiationinterval") { assert(MD->getNumOperands() == 2 && "Pipeline initiation interval hint metadata should have two operands."); Index: llvm/test/CodeGen/Hexagon/swp-pragma-disable-bug.ll =================================================================== --- /dev/null +++ llvm/test/CodeGen/Hexagon/swp-pragma-disable-bug.ll @@ -0,0 +1,57 @@ +; RUN: llc -O2 -march=hexagon -enable-pipeliner \ +; RUN: -debug-only=pipeliner < %s 2>&1 > /dev/null | FileCheck %s +; REQUIRES: asserts +; +; Test that the pragma check that disables pipeliner does not disable pipelining +; on both the loops. +; CHECK: Can not pipeline loop +; CHECK-NOT: Can not pipeline loop + +; Function Attrs: nofree norecurse nounwind +define dso_local i32 @foo(i32* nocapture %a, i32* nocapture readonly %b, i32* nocapture %c) local_unnamed_addr #0 { +entry: + br label %for.body + +for.body: ; preds = %for.body, %entry + %i.023 = phi i32 [ 0, %entry ], [ %inc, %for.body ] + %arrayidx = getelementptr inbounds i32, i32* %b, i32 %i.023 + %0 = load i32, i32* %arrayidx, align 4, !tbaa !2 + %arrayidx1 = getelementptr inbounds i32, i32* %a, i32 %i.023 + %1 = load i32, i32* %arrayidx1, align 4, !tbaa !2 + %add = add nsw i32 %1, %0 + store i32 %add, i32* %arrayidx1, align 4, !tbaa !2 + %inc = add nuw nsw i32 %i.023, 1 + %exitcond24 = icmp eq i32 %inc, 10 + br i1 %exitcond24, label %for.body6, label %for.body, !llvm.loop !6 + +for.cond.cleanup5: ; preds = %for.body6 + ret i32 0 + +for.body6: ; preds = %for.body, %for.body6 + %i2.022 = phi i32 [ %inc11, %for.body6 ], [ 0, %for.body ] + %arrayidx7 = getelementptr inbounds i32, i32* %a, i32 %i2.022 + %2 = load i32, i32* %arrayidx7, align 4, !tbaa !2 + %arrayidx8 = getelementptr inbounds i32, i32* %c, i32 %i2.022 + %3 = load i32, i32* %arrayidx8, align 4, !tbaa !2 + %add9 = add nsw i32 %3, %2 + store i32 %add9, i32* %arrayidx8, align 4, !tbaa !2 + %inc11 = add nuw nsw i32 %i2.022, 1 + %exitcond = icmp eq i32 %inc11, 10 + br i1 %exitcond, label %for.cond.cleanup5, label %for.body6, !llvm.loop !8 +} + +attributes #0 = { nofree norecurse nounwind "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "frame-pointer"="all" "less-precise-fpmad"="false" "min-legal-vector-width"="0" "no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="hexagonv60" "target-features"="+v60,-long-calls" "unsafe-fp-math"="false" "use-soft-float"="false" } + +!llvm.module.flags = !{!0} +!llvm.ident = !{!1} + +!0 = !{i32 1, !"wchar_size", i32 4} +!1 = !{!"clang version 11.0.0 (https://github.com/llvm/llvm-project.git 6e29846b29d2bcaa8a7a3d869f24f242bd93d272)"} +!2 = !{!3, !3, i64 0} +!3 = !{!"int", !4, i64 0} +!4 = !{!"omnipotent char", !5, i64 0} +!5 = !{!"Simple C/C++ TBAA"} +!6 = distinct !{!6, !7} +!7 = !{!"llvm.loop.unroll.disable"} +!8 = distinct !{!8, !7, !9} +!9 = !{!"llvm.loop.pipeline.disable", i1 true}