1 files changed, 45 insertions, 0 deletions
diff --git a/test/Transforms/MemCpyOpt/merge-into-memset.ll b/test/Transforms/MemCpyOpt/merge-into-memset.ll
new file mode 100644
index 000000000000..fc31038a4e6d
--- /dev/null
+++ b/test/Transforms/MemCpyOpt/merge-into-memset.ll
@@ -0,0 +1,45 @@
+; RUN: opt < %s -memcpyopt -S | FileCheck %s
+; Update cached non-local dependence information when merging stores into memset.
+
+target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
+
+; Don't delete the memcpy in %if.then, even though it depends on an instruction
+; which will be deleted.
+
+; CHECK-LABEL: @foo
+define void @foo(i1 %c, i8* %d, i8* %e, i8* %f) {
+entry:
+  %tmp = alloca [50 x i8], align 8
+  %tmp4 = bitcast [50 x i8]* %tmp to i8*
+  %tmp1 = getelementptr inbounds i8, i8* %tmp4, i64 1
+  call void @llvm.memset.p0i8.i64(i8* nonnull %d, i8 0, i64 10, i32 1, i1 false), !dbg !5
+  store i8 0, i8* %tmp4, align 8, !dbg !5
+; CHECK: call void @llvm.memset.p0i8.i64(i8* nonnull %d, i8 0, i64 10, i32 1, i1 false), !dbg !5
+  call void @llvm.memcpy.p0i8.p0i8.i64(i8* nonnull %tmp1, i8* nonnull %d, i64 10, i32 1, i1 false)
+  br i1 %c, label %if.then, label %exit
+
+if.then:
+; CHECK: if.then:
+; CHECK: call void @llvm.memcpy.p0i8.p0i8.i64(i8* %f, i8* nonnull %tmp4, i64 30, i32 8, i1 false)
+  call void @llvm.memcpy.p0i8.p0i8.i64(i8* %f, i8* nonnull %tmp4, i64 30, i32 8, i1 false)
+  br label %exit
+
+exit:
+  ret void
+}
+
+declare void @llvm.memcpy.p0i8.p0i8.i64(i8*, i8*, i64, i32, i1)
+declare void @llvm.memset.p0i8.i64(i8*, i8, i64, i32, i1)
+
+!llvm.dbg.cu = !{!0}
+!llvm.module.flags = !{!3, !4}
+
+!0 = distinct !DICompileUnit(language: DW_LANG_Rust, file: !1, isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
+!1 = !DIFile(filename: "t.rs", directory: "/tmp")
+!2 = !{}
+!3 = !{i32 2, !"Dwarf Version", i32 4}
+!4 = !{i32 2, !"Debug Info Version", i32 3}
+!5 = !DILocation(line: 8, column: 5, scope: !6)
+!6 = distinct !DISubprogram(name: "bar", scope: !1, file: !1, line: 5, type: !7, isLocal: false, isDefinition: true, scopeLine: 5, flags: DIFlagPrototyped, isOptimized: false, unit: !0, variables: !2)
+!7 = !DISubroutineType(types: !8)
+!8 = !{null}