1 files changed, 36 insertions, 0 deletions
diff --git a/llvm/test/Transforms/MemCpyOpt/mixed-sizes.ll b/llvm/test/Transforms/MemCpyOpt/mixed-sizes.ll
new file mode 100644
index 00000000000..9091fe7f56c
--- /dev/null
+++ b/llvm/test/Transforms/MemCpyOpt/mixed-sizes.ll
@@ -0,0 +1,36 @@
+; RUN: opt < %s -memcpyopt -S | FileCheck %s
+; Handle memcpy-memcpy dependencies of differing sizes correctly.
+
+target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
+
+; Don't delete the second memcpy, even though there's an earlier
+; memcpy with a larger size from the same address.
+
+; CHECK-LABEL: @foo
+define i32 @foo(i1 %z) {
+entry:
+  %a = alloca [10 x i32]
+  %s = alloca [10 x i32]
+  %0 = bitcast [10 x i32]* %a to i8*
+  %1 = bitcast [10 x i32]* %s to i8*
+  call void @llvm.memset.p0i8.i64(i8* nonnull %1, i8 0, i64 40, i32 16, i1 false)
+  %arrayidx = getelementptr inbounds [10 x i32], [10 x i32]* %a, i64 0, i64 0
+  store i32 1, i32* %arrayidx
+  %scevgep = getelementptr [10 x i32], [10 x i32]* %s, i64 0, i64 1
+  %scevgep7 = bitcast i32* %scevgep to i8*
+  br i1 %z, label %for.body3.lr.ph, label %for.inc7.1
+
+for.body3.lr.ph:                                  ; preds = %entry
+  call void @llvm.memcpy.p0i8.p0i8.i64(i8* %0, i8* %scevgep7, i64 17179869180, i32 4, i1 false)
+  br label %for.inc7.1
+
+for.inc7.1:
+; CHECK: for.inc7.1:
+  call void @llvm.memcpy.p0i8.p0i8.i64(i8* %0, i8* %scevgep7, i64 4, i32 4, i1 false)
+; CHECK: call void @llvm.memcpy.p0i8.p0i8.i64(i8* %0, i8* %scevgep7, i64 4, i32 4, i1 false)
+  %2 = load i32, i32* %arrayidx
+  ret i32 %2
+}
+
+declare void @llvm.memcpy.p0i8.p0i8.i64(i8*, i8*, i64, i32, i1)
+declare void @llvm.memset.p0i8.i64(i8*, i8, i64, i32, i1)