--- /dev/null
+; Test lib call simplification of __strcpy_chk calls with various values
+; for src, dst, and slen.
+;
+; RUN: opt < %s -instcombine -S | FileCheck %s
+
+target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128"
+
+@a = common global [60 x i8] zeroinitializer, align 1
+@b = common global [60 x i8] zeroinitializer, align 1
+@.str = private constant [8 x i8] c"abcdefg\00"
+
+; Check cases where slen >= strlen (src).
+
+define void @test_simplify1() {
+; CHECK: @test_simplify1
+ %dst = getelementptr inbounds [60 x i8]* @a, i32 0, i32 0
+ %src = getelementptr inbounds [8 x i8]* @.str, i32 0, i32 0
+
+; CHECK-NEXT: call i8* @strcpy
+ call i8* @__strcpy_chk(i8* %dst, i8* %src, i32 60)
+ ret void
+}
+
+define void @test_simplify2() {
+; CHECK: @test_simplify2
+ %dst = getelementptr inbounds [60 x i8]* @a, i32 0, i32 0
+ %src = getelementptr inbounds [8 x i8]* @.str, i32 0, i32 0
+
+; CHECK-NEXT: call i8* @strcpy
+ call i8* @__strcpy_chk(i8* %dst, i8* %src, i32 8)
+ ret void
+}
+
+define void @test_simplify3() {
+; CHECK: @test_simplify3
+ %dst = getelementptr inbounds [60 x i8]* @a, i32 0, i32 0
+ %src = getelementptr inbounds [8 x i8]* @.str, i32 0, i32 0
+
+; CHECK-NEXT: call i8* @strcpy
+ call i8* @__strcpy_chk(i8* %dst, i8* %src, i32 -1)
+ ret void
+}
+
+; Check cases where there are no string constants.
+
+define void @test_simplify4() {
+; CHECK: @test_simplify4
+ %dst = getelementptr inbounds [60 x i8]* @a, i32 0, i32 0
+ %src = getelementptr inbounds [60 x i8]* @b, i32 0, i32 0
+
+; CHECK-NEXT: call i8* @strcpy
+ call i8* @__strcpy_chk(i8* %dst, i8* %src, i32 -1)
+ ret void
+}
+
+define void @test_no_simplify1() {
+; CHECK: @test_no_simplify1
+ %dst = getelementptr inbounds [60 x i8]* @a, i32 0, i32 0
+ %src = getelementptr inbounds [60 x i8]* @b, i32 0, i32 0
+
+; CHECK-NEXT: call i8* @__strcpy_chk
+ call i8* @__strcpy_chk(i8* %dst, i8* %src, i32 8)
+ ret void
+}
+
+; Check case were slen < strlen (src).
+
+define void @test_no_simplify2() {
+; CHECK: @test_no_simplify2
+ %dst = getelementptr inbounds [60 x i8]* @a, i32 0, i32 0
+ %src = getelementptr inbounds [8 x i8]* @.str, i32 0, i32 0
+
+; CHECK-NEXT: call i8* @__strcpy_chk
+ call i8* @__strcpy_chk(i8* %dst, i8* %src, i32 3)
+ ret void
+}
+
+define void @test_no_simplify3() {
+; CHECK: @test_no_simplify3
+ %dst = getelementptr inbounds [60 x i8]* @a, i32 0, i32 0
+ %src = getelementptr inbounds [8 x i8]* @.str, i32 0, i32 0
+
+; CHECK-NEXT: call i8* @__strcpy_chk
+ call i8* @__strcpy_chk(i8* %dst, i8* %src, i32 0)
+ ret void
+}
+
+declare i8* @__strcpy_chk(i8*, i8*, i32) nounwind
--- /dev/null
+; Test that lib call simplification doesn't simplify __strcpy_chk calls
+; with the wrong prototype.
+;
+; RUN: opt < %s -instcombine -S | FileCheck %s
+
+target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128"
+
+@a = common global [60 x i16] zeroinitializer, align 1
+@.str = private constant [8 x i8] c"abcdefg\00"
+
+define void @test_no_simplify() {
+; CHECK: @test_no_simplify
+ %dst = getelementptr inbounds [60 x i16]* @a, i32 0, i32 0
+ %src = getelementptr inbounds [8 x i8]* @.str, i32 0, i32 0
+
+; CHECK-NEXT: call i16* @__strcpy_chk
+ call i16* @__strcpy_chk(i16* %dst, i8* %src, i32 8)
+ ret void
+}
+
+declare i16* @__strcpy_chk(i16*, i8*, i32)