1; Test lib call simplification of __memmove_chk calls with various values 2; for dstlen and len. 3; 4; RUN: opt < %s -instcombine -S | FileCheck %s 5 6target 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" 7 8%struct.T1 = type { [100 x i32], [100 x i32], [1024 x i8] } 9%struct.T2 = type { [100 x i32], [100 x i32], [1024 x i8] } 10%struct.T3 = type { [100 x i32], [100 x i32], [2048 x i8] } 11 12@t1 = common global %struct.T1 zeroinitializer 13@t2 = common global %struct.T2 zeroinitializer 14@t3 = common global %struct.T3 zeroinitializer 15 16; Check cases where dstlen >= len. 17 18define void @test_simplify1() { 19; CHECK-LABEL: @test_simplify1( 20 %dst = bitcast %struct.T1* @t1 to i8* 21 %src = bitcast %struct.T2* @t2 to i8* 22 23; CHECK-NEXT: call void @llvm.memmove.p0i8.p0i8.i64 24 call i8* @__memmove_chk(i8* %dst, i8* %src, i64 1824, i64 1824) 25 ret void 26} 27 28define void @test_simplify2() { 29; CHECK-LABEL: @test_simplify2( 30 %dst = bitcast %struct.T1* @t1 to i8* 31 %src = bitcast %struct.T3* @t3 to i8* 32 33; CHECK-NEXT: call void @llvm.memmove.p0i8.p0i8.i64 34 call i8* @__memmove_chk(i8* %dst, i8* %src, i64 1824, i64 2848) 35 ret void 36} 37 38; Check cases where dstlen < len. 39 40define void @test_no_simplify1() { 41; CHECK-LABEL: @test_no_simplify1( 42 %dst = bitcast %struct.T3* @t3 to i8* 43 %src = bitcast %struct.T1* @t1 to i8* 44 45; CHECK-NEXT: call i8* @__memmove_chk 46 call i8* @__memmove_chk(i8* %dst, i8* %src, i64 2848, i64 1824) 47 ret void 48} 49 50define void @test_no_simplify2() { 51; CHECK-LABEL: @test_no_simplify2( 52 %dst = bitcast %struct.T1* @t1 to i8* 53 %src = bitcast %struct.T2* @t2 to i8* 54 55; CHECK-NEXT: call i8* @__memmove_chk 56 call i8* @__memmove_chk(i8* %dst, i8* %src, i64 1024, i64 0) 57 ret void 58} 59 60declare i8* @__memmove_chk(i8*, i8*, i64, i64) 61