Safely turn memset_chk etc. to non-chk variant if the known object size is >= memset / memcpy / memmove size.
llvm-svn: 97828
diff --git a/llvm/test/Transforms/SimplifyLibCalls/memset_chk.ll b/llvm/test/Transforms/SimplifyLibCalls/memset_chk.ll
new file mode 100644
index 0000000..c4ef60e
--- /dev/null
+++ b/llvm/test/Transforms/SimplifyLibCalls/memset_chk.ll
@@ -0,0 +1,18 @@
+; RUN: opt < %s -simplify-libcalls -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.data = type { [100 x i32], [100 x i32], [1024 x i8] }
+
+define i32 @t() nounwind ssp {
+; CHECK: @t
+; CHECK: @llvm.memset.i64
+entry:
+ %0 = alloca %struct.data, align 8 ; <%struct.data*> [#uses=1]
+ %1 = bitcast %struct.data* %0 to i8* ; <i8*> [#uses=1]
+ %2 = call i8* @__memset_chk(i8* %1, i32 0, i64 1824, i64 1824) nounwind ; <i8*> [#uses=0]
+ ret i32 0
+}
+
+declare i8* @__memset_chk(i8*, i32, i64, i64) nounwind