[BasicAA] Add first libfunc tests with memcmp.

Author: fhahn

llvm/test/Analysis/BasicAA/libfuncs.ll

@@ -0,0 +1,49 @@
+; RUN: opt -inferattrs -basic-aa -aa-eval -print-all-alias-modref-info -disable-output 2>&1 %s | FileCheck %s
+
+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"
+target triple = "x86_64-apple-macosx10.7"
+
+; CHECK-LABEL: Function: test_memcmp_const_size
+; CHECK:      Just Ref:  Ptr: i8* %a	<->  %res = tail call i32 @memcmp(i8* %a, i8* %b, i64 4)
+; CHECK-NEXT: Just Ref:  Ptr: i8* %b	<->  %res = tail call i32 @memcmp(i8* %a, i8* %b, i64 4)
+; CHECK-NEXT: Just Ref:  Ptr: i8* %a.gep.1	<->  %res = tail call i32 @memcmp(i8* %a, i8* %b, i64 4)
+; CHECK-NEXT: Just Ref:  Ptr: i8* %a.gep.5	<->  %res = tail call i32 @memcmp(i8* %a, i8* %b, i64 4)
+; CHECK-NEXT: Just Ref:  Ptr: i8* %b.gep.1	<->  %res = tail call i32 @memcmp(i8* %a, i8* %b, i64 4)
+; CHECK-NEXT: Just Ref:  Ptr: i8* %b.gep.5	<->  %res = tail call i32 @memcmp(i8* %a, i8* %b, i64 4)
+define i32 @test_memcmp_const_size(i8* noalias %a, i8* noalias %b) {
+entry:
+  %res = tail call i32 @memcmp(i8* %a, i8* %b, i64 4)
+  %a.gep.1 = getelementptr i8, i8* %a, i32 1
+  store i8 0, i8* %a.gep.1
+  %a.gep.5 = getelementptr i8, i8* %a, i32 5
+  store i8 1, i8* %a.gep.5
+  %b.gep.1 = getelementptr i8, i8* %b, i32 1
+  store i8 2, i8* %b.gep.1
+  %b.gep.5 = getelementptr i8, i8* %b, i32 5
+  store i8 3, i8* %b.gep.5
+  ret i32 %res
+}
+
+; CHECK-LABEL: Function: test_memcmp_variable_size
+; CHECK:      Just Ref:  Ptr: i8* %a	<->  %res = tail call i32 @memcmp(i8* %a, i8* %b, i64 %n)
+; CHECK-NEXT: Just Ref:  Ptr: i8* %b	<->  %res = tail call i32 @memcmp(i8* %a, i8* %b, i64 %n)
+; CHECK-NEXT: Just Ref:  Ptr: i8* %a.gep.1	<->  %res = tail call i32 @memcmp(i8* %a, i8* %b, i64 %n)
+; CHECK-NEXT: Just Ref:  Ptr: i8* %a.gep.5	<->  %res = tail call i32 @memcmp(i8* %a, i8* %b, i64 %n)
+; CHECK-NEXT: Just Ref:  Ptr: i8* %b.gep.1	<->  %res = tail call i32 @memcmp(i8* %a, i8* %b, i64 %n)
+; CHECK-NEXT: Just Ref:  Ptr: i8* %b.gep.5	<->  %res = tail call i32 @memcmp(i8* %a, i8* %b, i64 %n)
+define i32 @test_memcmp_variable_size(i8* noalias %a, i8* noalias %b, i64 %n) {
+entry:
+  %res = tail call i32 @memcmp(i8* %a, i8* %b, i64 %n)
+  %a.gep.1 = getelementptr i8, i8* %a, i32 1
+  store i8 0, i8* %a.gep.1
+  %a.gep.5 = getelementptr i8, i8* %a, i32 5
+  store i8 1, i8* %a.gep.5
+  %b.gep.1 = getelementptr i8, i8* %b, i32 1
+  store i8 2, i8* %b.gep.1
+  %b.gep.5 = getelementptr i8, i8* %b, i32 5
+  store i8 3, i8* %b.gep.5
+  ret i32 %res
+}
+
+
+declare i32 @memcmp(i8*, i8*, i64)