PlaceSafepoints: Fix using default constructed TargetLibraryInfo (#92411)

Author: arsenm

llvm/include/llvm/Analysis/TargetLibraryInfo.h

@@ -633,6 +633,10 @@ class TargetLibraryInfoWrapperPass : public ImmutablePass {
   explicit TargetLibraryInfoWrapperPass(const Triple &T);
   explicit TargetLibraryInfoWrapperPass(const TargetLibraryInfoImpl &TLI);
 
+  // FIXME: This should be removed when PlaceSafepoints is fixed to not create a
+  // PassManager inside a pass.
+  explicit TargetLibraryInfoWrapperPass(const TargetLibraryInfo &TLI);
+
   TargetLibraryInfo &getTLI(const Function &F) {
     FunctionAnalysisManager DummyFAM;
     TLI = TLA.run(F, DummyFAM);

llvm/lib/Analysis/TargetLibraryInfo.cpp

@@ -1383,6 +1383,10 @@ TargetLibraryInfoWrapperPass::TargetLibraryInfoWrapperPass(
   initializeTargetLibraryInfoWrapperPassPass(*PassRegistry::getPassRegistry());
 }
 
+TargetLibraryInfoWrapperPass::TargetLibraryInfoWrapperPass(
+    const TargetLibraryInfo &TLIOther)
+    : TargetLibraryInfoWrapperPass(*TLIOther.Impl) {}
+
 AnalysisKey TargetLibraryAnalysis::Key;
 
 // Register the basic pass.

llvm/lib/Transforms/Scalar/PlaceSafepoints.cpp

@@ -288,6 +288,8 @@ bool PlaceSafepointsPass::runImpl(Function &F, const TargetLibraryInfo &TLI) {
     // with for the moment.
     legacy::FunctionPassManager FPM(F.getParent());
     bool CanAssumeCallSafepoints = enableCallSafepoints(F);
+
+    FPM.add(new TargetLibraryInfoWrapperPass(TLI));
     auto *PBS = new PlaceBackedgeSafepointsLegacyPass(CanAssumeCallSafepoints);
     FPM.add(PBS);
     FPM.run(F);

llvm/test/Transforms/PlaceSafepoints/libcall.ll

@@ -1,4 +1,6 @@
-; RUN: opt -S -passes=place-safepoints < %s | FileCheck %s
+; RUN: opt -S -passes=place-safepoints < %s | FileCheck -check-prefixes=CHECK,WITHLDEXPF %s
+; RUN: opt -S -passes=place-safepoints -disable-builtin=ldexp < %s | FileCheck %s
+
 
 ; Libcalls will not contain a safepoint poll, so check that we insert
 ; a safepoint in a loop containing a libcall.
@@ -17,7 +19,8 @@ loop:
 ; CHECK-NEXT: %x_loop = phi double [ %x, %entry ], [ %x_exp, %loop ]
 ; CHECK-NEXT: %x_exp = call double @ldexp(double %x_loop, i32 5)
 ; CHECK-NEXT: %done = fcmp ogt double %x_exp, 1.5
-; CHECK-NEXT: call void @do_safepoint
+; WITHLDEXPF-NEXT: call void @do_safepoint
+; CHECK-NEXT: br
   %x_loop = phi double [ %x, %entry ], [ %x_exp, %loop ]
   %x_exp = call double @ldexp(double %x_loop, i32 5) nounwind readnone
   %done = fcmp ogt double %x_exp, 1.5