; Test lib call simplification of __strncpy_chk calls with various values ; for len and dstlen. ; ; 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 [12 x i8] c"abcdefghijk\00" ; Check cases where dstlen >= len define void @test_simplify1() { ; CHECK-LABEL: @test_simplify1( %dst = getelementptr inbounds [60 x i8]* @a, i32 0, i32 0 %src = getelementptr inbounds [12 x i8]* @.str, i32 0, i32 0 ; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i32 call i8* @__strncpy_chk(i8* %dst, i8* %src, i32 12, i32 60) ret void } define void @test_simplify2() { ; CHECK-LABEL: @test_simplify2( %dst = getelementptr inbounds [60 x i8]* @a, i32 0, i32 0 %src = getelementptr inbounds [12 x i8]* @.str, i32 0, i32 0 ; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i32 call i8* @__strncpy_chk(i8* %dst, i8* %src, i32 12, i32 12) ret void } define void @test_simplify3() { ; CHECK-LABEL: @test_simplify3( %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* @strncpy call i8* @__strncpy_chk(i8* %dst, i8* %src, i32 12, i32 60) ret void } ; Check cases where dstlen < len define void @test_no_simplify1() { ; CHECK-LABEL: @test_no_simplify1( %dst = getelementptr inbounds [60 x i8]* @a, i32 0, i32 0 %src = getelementptr inbounds [12 x i8]* @.str, i32 0, i32 0 ; CHECK-NEXT: call i8* @__strncpy_chk call i8* @__strncpy_chk(i8* %dst, i8* %src, i32 8, i32 4) ret void } define void @test_no_simplify2() { ; CHECK-LABEL: @test_no_simplify2( %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* @__strncpy_chk call i8* @__strncpy_chk(i8* %dst, i8* %src, i32 8, i32 0) ret void } declare i8* @__strncpy_chk(i8*, i8*, i32, i32)