Imported Upstream version 5.18.0.205

Former-commit-id: 7f59f7e792705db773f1caecdaa823092f4e2927

external/llvm/test/Transforms/PlaceSafepoints/libcall.ll

@@ -0,0 +1,37 @@
+; RUN: opt -S -place-safepoints < %s | FileCheck %s
+
+; Libcalls will not contain a safepoint poll, so check that we insert
+; a safepoint in a loop containing a libcall.
+declare double @ldexp(double %x, i32 %n) nounwind readnone
+define double @test_libcall(double %x) gc "statepoint-example" {
+; CHECK-LABEL: test_libcall
+
+entry:
+; CHECK: entry
+; CHECK-NEXT: call void @do_safepoint
+; CHECK-NEXT: br label %loop
+  br label %loop
+
+loop:
+; CHECK: 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
+  %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
+  br i1 %done, label %end, label %loop
+end:
+  %x_end = phi double [%x_exp, %loop]
+  ret double %x_end
+}
+
+; This function is inlined when inserting a poll.
+declare void @do_safepoint()
+define void @gc.safepoint_poll() {
+; CHECK-LABEL: gc.safepoint_poll
+entry:
+  call void @do_safepoint()
+  ret void
+}