1 files changed, 49 insertions, 0 deletions
diff --git a/llvm/test/Transforms/InstCombine/memcpy.ll b/llvm/test/Transforms/InstCombine/memcpy.ll
new file mode 100644
index 00000000000..1adb815f612
--- /dev/null
+++ b/llvm/test/Transforms/InstCombine/memcpy.ll
@@ -0,0 +1,49 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+; RUN: opt < %s -instcombine -S | FileCheck %s
+
+declare void @llvm.memcpy.p0i8.p0i8.i32(i8* nocapture, i8* nocapture, i32, i1) nounwind
+declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture, i8* nocapture, i64, i1) nounwind
+
+; Same src/dest.
+
+define void @test1(i8* %a) {
+; CHECK-LABEL: @test1(
+; CHECK-NEXT:    ret void
+;
+  tail call void @llvm.memcpy.p0i8.p0i8.i32(i8* %a, i8* %a, i32 100, i1 false)
+  ret void
+}
+
+; PR8267 - same src/dest, but volatile.
+
+define void @test2(i8* %a) {
+; CHECK-LABEL: @test2(
+; CHECK-NEXT:    tail call void @llvm.memcpy.p0i8.p0i8.i32(i8* [[A:%.*]], i8* [[A]], i32 100, i1 true)
+; CHECK-NEXT:    ret void
+;
+  tail call void @llvm.memcpy.p0i8.p0i8.i32(i8* %a, i8* %a, i32 100, i1 true)
+  ret void
+}
+
+; 17179869184 == 0x400000000 - make sure that doesn't get truncated to 32-bit.
+
+define void @test3(i8* %d, i8* %s) {
+; CHECK-LABEL: @test3(
+; CHECK-NEXT:    tail call void @llvm.memcpy.p0i8.p0i8.i64(i8* align 4 [[D:%.*]], i8* align 4 [[S:%.*]], i64 17179869184, i1 false)
+; CHECK-NEXT:    ret void
+;
+  tail call void @llvm.memcpy.p0i8.p0i8.i64(i8* align 4 %d, i8* align 4 %s, i64 17179869184, i1 false)
+  ret void
+}
+
+@UnknownConstant = external constant i128
+
+define void @memcpy_to_constant(i8* %src) {
+; CHECK-LABEL: @memcpy_to_constant(
+; CHECK-NEXT:    call void @llvm.memcpy.p0i8.p0i8.i32(i8* align 4 bitcast (i128* @UnknownConstant to i8*), i8* align 1 [[SRC:%.*]], i32 16, i1 false)
+; CHECK-NEXT:    ret void
+;
+  %dest = bitcast i128* @UnknownConstant to i8*
+  call void @llvm.memcpy.p0i8.p0i8.i32(i8* %dest, i8* %src, i32 16, i1 false)
+  ret void
+}