Migrate this test from llvm/test/FrontendC++/ptr-to-method-devirt.cpp and

FileCheckize. It is more properly an optimizer test.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@137700 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/Transforms/InstCombine/devirt.ll b/test/Transforms/InstCombine/devirt.ll
new file mode 100644 (file)
index 0000000..6189dc2
--- /dev/null
+++ b/test/Transforms/InstCombine/devirt.ll
@@ -0,0 +1,39 @@
+; RUN: opt -instcombine -S -o - %s | FileCheck %s
+
+; CHECK-NOT: getelementptr
+; CHECK-NOT: ptrtoint
+; CHECK: bitcast i8*
+%struct.S = type { i32 (...)** }
+
+@_ZL1p = internal constant { i64, i64 } { i64 1, i64 0 }, align 8
+
+define void @_Z1g1S(%struct.S* %s) nounwind {
+entry:
+  %tmp = load { i64, i64 }* @_ZL1p, align 8
+  %memptr.adj = extractvalue { i64, i64 } %tmp, 1
+  %0 = bitcast %struct.S* %s to i8*
+  %1 = getelementptr inbounds i8* %0, i64 %memptr.adj
+  %this.adjusted = bitcast i8* %1 to %struct.S*
+  %memptr.ptr = extractvalue { i64, i64 } %tmp, 0
+  %2 = and i64 %memptr.ptr, 1
+  %memptr.isvirtual = icmp ne i64 %2, 0
+  br i1 %memptr.isvirtual, label %memptr.virtual, label %memptr.nonvirtual
+
+memptr.virtual:                                   ; preds = %entry
+  %3 = bitcast %struct.S* %this.adjusted to i8**
+  %memptr.vtable = load i8** %3
+  %4 = sub i64 %memptr.ptr, 1
+  %5 = getelementptr i8* %memptr.vtable, i64 %4
+  %6 = bitcast i8* %5 to void (%struct.S*)**
+  %memptr.virtualfn = load void (%struct.S*)** %6
+  br label %memptr.end
+
+memptr.nonvirtual:                                ; preds = %entry
+  %memptr.nonvirtualfn = inttoptr i64 %memptr.ptr to void (%struct.S*)*
+  br label %memptr.end
+
+memptr.end:                                       ; preds = %memptr.nonvirtual, %memptr.virtual
+  %7 = phi void (%struct.S*)* [ %memptr.virtualfn, %memptr.virtual ], [ %memptr.nonvirtualfn, %memptr.nonvirtual ]
+  call void %7(%struct.S* %this.adjusted)
+  ret void
+}