[PlaceSafepoints] Stop special casing some intrinsics

We were special casing a handful of intrinsics as not needing a safepoint before them.  After running into another valid case - memset - I took a closer look and realized that almost no intrinsics need to have a safepoint poll before them.  Restructure the code to make that apparent so that we stop hitting these bugs.  The only intrinsics which need a safepoint poll before them are ones which can run arbitrary code.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@237744 91177308-0d34-0410-b5e6-96231b3b80d8

test/Transforms/PlaceSafepoints/memset.ll

@@ -0,0 +1,20 @@
+; RUN: opt -S -place-safepoints %s | FileCheck %s
+
+define void @test(i32, i8 addrspace(1)* %ptr) gc "statepoint-example" {
+; CHECK-LABEL: @test
+; CHECK-NEXT: llvm.memset
+; CHECK: do_safepoint
+; CHECK: @foo
+  call void @llvm.memset.p1i8.i64(i8 addrspace(1)* %ptr, i8 0, i64 24, i32 8, i1 false)
+  call void @foo()
+  ret void
+}
+
+declare void @foo()
+declare void @llvm.memset.p1i8.i64(i8 addrspace(1)*, i8, i64, i32, i1)
+
+declare void @do_safepoint()
+define void @gc.safepoint_poll() {
+  call void @do_safepoint()
+  ret void
+}