1 files changed, 61 insertions, 0 deletions
diff --git a/test/Transforms/InstCombine/memset_chk-1.ll b/test/Transforms/InstCombine/memset_chk-1.ll
new file mode 100644
index 000000000000..be4c1cfccdb2
--- /dev/null
+++ b/test/Transforms/InstCombine/memset_chk-1.ll
@@ -0,0 +1,61 @@
+; Test lib call simplification of __memset_chk calls with various values
+; for dstlen and len.
+;
+; RUN: opt < %s -instcombine -S | FileCheck %s
+; rdar://7719085
+
+target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"
+
+%struct.T = type { [100 x i32], [100 x i32], [1024 x i8] }
+@t = common global %struct.T zeroinitializer
+
+; Check cases where dstlen >= len.
+
+define void @test_simplify1() {
+; CHECK: @test_simplify1
+  %dst = bitcast %struct.T* @t to i8*
+
+; CHECK-NEXT: call void @llvm.memset.p0i8.i64
+  call i8* @__memset_chk(i8* %dst, i32 0, i64 1824, i64 1824)
+  ret void
+}
+
+define void @test_simplify2() {
+; CHECK: @test_simplify2
+  %dst = bitcast %struct.T* @t to i8*
+
+; CHECK-NEXT: call void @llvm.memset.p0i8.i64
+  call i8* @__memset_chk(i8* %dst, i32 0, i64 1824, i64 3648)
+  ret void
+}
+
+define void @test_simplify3() {
+; CHECK: @test_simplify3
+  %dst = bitcast %struct.T* @t to i8*
+
+; CHECK-NEXT: call void @llvm.memset.p0i8.i64
+  call i8* @__memset_chk(i8* %dst, i32 0, i64 1824, i64 -1)
+  ret void
+}
+
+; Check cases where dstlen < len.
+
+define void @test_no_simplify1() {
+; CHECK: @test_no_simplify1
+  %dst = bitcast %struct.T* @t to i8*
+
+; CHECK-NEXT: call i8* @__memset_chk
+  call i8* @__memset_chk(i8* %dst, i32 0, i64 1824, i64 400)
+  ret void
+}
+
+define void @test_no_simplify2() {
+; CHECK: @test_no_simplify2
+  %dst = bitcast %struct.T* @t to i8*
+
+; CHECK-NEXT: call i8* @__memset_chk
+  call i8* @__memset_chk(i8* %dst, i32 0, i64 1824, i64 0)
+  ret void
+}
+
+declare i8* @__memset_chk(i8*, i32, i64, i64)