1 ; Test lib call simplification of __memset_chk calls with various values
4 ; RUN: opt < %s -instcombine -S | FileCheck %s
7 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"
9 %struct.T = type { [100 x i32], [100 x i32], [1024 x i8] }
10 @t = common global %struct.T zeroinitializer
12 ; Check cases where dstlen >= len.
14 define void @test_simplify1() {
15 ; CHECK-LABEL: @test_simplify1(
16 %dst = bitcast %struct.T* @t to i8*
18 ; CHECK-NEXT: call void @llvm.memset.p0i8.i64
19 call i8* @__memset_chk(i8* %dst, i32 0, i64 1824, i64 1824)
23 define void @test_simplify2() {
24 ; CHECK-LABEL: @test_simplify2(
25 %dst = bitcast %struct.T* @t to i8*
27 ; CHECK-NEXT: call void @llvm.memset.p0i8.i64
28 call i8* @__memset_chk(i8* %dst, i32 0, i64 1824, i64 3648)
32 define void @test_simplify3() {
33 ; CHECK-LABEL: @test_simplify3(
34 %dst = bitcast %struct.T* @t to i8*
36 ; CHECK-NEXT: call void @llvm.memset.p0i8.i64
37 call i8* @__memset_chk(i8* %dst, i32 0, i64 1824, i64 -1)
41 ; Check cases where dstlen < len.
43 define void @test_no_simplify1() {
44 ; CHECK-LABEL: @test_no_simplify1(
45 %dst = bitcast %struct.T* @t to i8*
47 ; CHECK-NEXT: call i8* @__memset_chk
48 call i8* @__memset_chk(i8* %dst, i32 0, i64 1824, i64 400)
52 define void @test_no_simplify2() {
53 ; CHECK-LABEL: @test_no_simplify2(
54 %dst = bitcast %struct.T* @t to i8*
56 ; CHECK-NEXT: call i8* @__memset_chk
57 call i8* @__memset_chk(i8* %dst, i32 0, i64 1824, i64 0)
61 declare i8* @__memset_chk(i8*, i32, i64, i64)