1 ; Test lib call simplification of __memcpy_chk calls with various values 2 ; for dstlen and len. 3 ; 4 ; RUN: opt < %s -instcombine -S | FileCheck %s 5 6 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" 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 18 define i8* @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.memcpy.p0i8.p0i8.i64(i8* bitcast (%struct.T1* @t1 to i8*), i8* bitcast (%struct.T2* @t2 to i8*), i64 1824, i32 4, i1 false) 24 ; CHECK-NEXT: ret i8* bitcast (%struct.T1* @t1 to i8*) 25 %ret = call i8* @__memcpy_chk(i8* %dst, i8* %src, i64 1824, i64 1824) 26 ret i8* %ret 27 } 28 29 define i8* @test_simplify2() { 30 ; CHECK-LABEL: @test_simplify2( 31 %dst = bitcast %struct.T1* @t1 to i8* 32 %src = bitcast %struct.T3* @t3 to i8* 33 34 ; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i64(i8* bitcast (%struct.T1* @t1 to i8*), i8* bitcast (%struct.T3* @t3 to i8*), i64 1824, i32 4, i1 false) 35 ; CHECK-NEXT: ret i8* bitcast (%struct.T1* @t1 to i8*) 36 %ret = call i8* @__memcpy_chk(i8* %dst, i8* %src, i64 1824, i64 2848) 37 ret i8* %ret 38 } 39 40 ; Check cases where dstlen < len. 41 42 define i8* @test_no_simplify1() { 43 ; CHECK-LABEL: @test_no_simplify1( 44 %dst = bitcast %struct.T3* @t3 to i8* 45 %src = bitcast %struct.T1* @t1 to i8* 46 47 ; CHECK-NEXT: %ret = call i8* @__memcpy_chk(i8* bitcast (%struct.T3* @t3 to i8*), i8* bitcast (%struct.T1* @t1 to i8*), i64 2848, i64 1824) 48 ; CHECK-NEXT: ret i8* %ret 49 %ret = call i8* @__memcpy_chk(i8* %dst, i8* %src, i64 2848, i64 1824) 50 ret i8* %ret 51 } 52 53 define i8* @test_no_simplify2() { 54 ; CHECK-LABEL: @test_no_simplify2( 55 %dst = bitcast %struct.T1* @t1 to i8* 56 %src = bitcast %struct.T2* @t2 to i8* 57 58 ; CHECK-NEXT: %ret = call i8* @__memcpy_chk(i8* bitcast (%struct.T1* @t1 to i8*), i8* bitcast (%struct.T2* @t2 to i8*), i64 1024, i64 0) 59 ; CHECK-NEXT: ret i8* %ret 60 %ret = call i8* @__memcpy_chk(i8* %dst, i8* %src, i64 1024, i64 0) 61 ret i8* %ret 62 } 63 64 define i8* @test_simplify_return_indcall(i8* ()* %alloc) { 65 ; CHECK-LABEL: @test_simplify_return_indcall( 66 %src = bitcast %struct.T2* @t2 to i8* 67 68 ; CHECK-NEXT: %dst = call i8* %alloc() 69 %dst = call i8* %alloc() 70 71 ; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i64 72 %ret = call i8* @__memcpy_chk(i8* %dst, i8* %src, i64 1824, i64 1824) 73 ; CHECK-NEXT: ret i8* %dst 74 ret i8* %ret 75 } 76 77 declare i8* @__memcpy_chk(i8*, i8*, i64, i64) 78
