; NOTE: Assertions have been autogenerated by utils/update_test_checks.py ; RUN: opt < %s -S -aa-pipeline=basic-aa -passes=inferattrs,dse | FileCheck %s target triple = "x86_64-unknown-linux-gnu" declare ptr @strcpy(ptr %dest, ptr %src) nounwind define void @test1(ptr %src) { ; CHECK-LABEL: @test1( ; CHECK-NEXT: ret void ; %B = alloca [16 x i8] %call = call ptr @strcpy(ptr %B, ptr %src) ret void } define void @strcpy_reads_after(ptr noalias %dest, ptr %src) { ; CHECK-LABEL: @strcpy_reads_after( ; CHECK-NEXT: [[SRC_2:%.*]] = getelementptr inbounds i8, ptr [[SRC:%.*]], i64 1 ; CHECK-NEXT: store i8 99, ptr [[SRC_2]], align 1 ; CHECK-NEXT: [[SRC_1:%.*]] = getelementptr inbounds i8, ptr [[SRC]], i64 1 ; CHECK-NEXT: [[CALL:%.*]] = call ptr @strcpy(ptr [[DEST:%.*]], ptr [[SRC_1]]) ; CHECK-NEXT: store i8 2, ptr [[SRC]], align 1 ; CHECK-NEXT: store i8 2, ptr [[SRC_2]], align 1 ; CHECK-NEXT: ret void ; %src.2 = getelementptr inbounds i8, ptr %src, i64 1 store i8 1, ptr %src store i8 99, ptr %src.2 %src.1 = getelementptr inbounds i8, ptr %src, i64 1 %call = call ptr @strcpy(ptr %dest, ptr %src.1) store i8 2, ptr %src store i8 2, ptr %src.2 ret void } declare ptr @strncpy(ptr %dest, ptr %src, i64 %n) nounwind define void @test2(ptr %src) { ; CHECK-LABEL: @test2( ; CHECK-NEXT: ret void ; %B = alloca [16 x i8] %call = call ptr @strncpy(ptr %B, ptr %src, i64 12) ret void } declare ptr @strcat(ptr %B, ptr %src) nounwind define void @test3(ptr %src) { ; CHECK-LABEL: @test3( ; CHECK-NEXT: ret void ; %B = alloca [16 x i8] %call = call ptr @strcat(ptr %B, ptr %src) ret void } define void @test_strcat_with_lifetime(ptr %src) { ; CHECK-LABEL: @test_strcat_with_lifetime( ; CHECK-NEXT: [[B:%.*]] = alloca [16 x i8], align 1 ; CHECK-NEXT: call void @llvm.lifetime.start.p0(i64 16, ptr nonnull [[B]]) ; CHECK-NEXT: call void @llvm.lifetime.end.p0(i64 16, ptr nonnull [[B]]) ; CHECK-NEXT: ret void ; %B = alloca [16 x i8] call void @llvm.lifetime.start.p0(i64 16, ptr nonnull %B) %call = call ptr @strcat(ptr %B, ptr %src) call void @llvm.lifetime.end.p0(i64 16, ptr nonnull %B) ret void } define void @test_strcat_with_lifetime_nonlocal(ptr %dest, ptr %src) { ; CHECK-LABEL: @test_strcat_with_lifetime_nonlocal( ; CHECK-NEXT: call void @llvm.lifetime.start.p0(i64 16, ptr nonnull [[DEST:%.*]]) ; CHECK-NEXT: [[CALL:%.*]] = call ptr @strcat(ptr [[DEST]], ptr [[SRC:%.*]]) ; CHECK-NEXT: call void @llvm.lifetime.end.p0(i64 16, ptr nonnull [[DEST]]) ; CHECK-NEXT: ret void ; call void @llvm.lifetime.start.p0(i64 16, ptr nonnull %dest) %call = call ptr @strcat(ptr %dest, ptr %src) call void @llvm.lifetime.end.p0(i64 16, ptr nonnull %dest) ret void } declare ptr @strncat(ptr %dest, ptr %src, i64 %n) nounwind define void @test4(ptr %src) { ; CHECK-LABEL: @test4( ; CHECK-NEXT: ret void ; %B = alloca [16 x i8] %call = call ptr @strncat(ptr %B, ptr %src, i64 12) ret void } define void @test5(ptr nocapture %src) { ; CHECK-LABEL: @test5( ; CHECK-NEXT: ret void ; %dest = alloca [100 x i8], align 16 %call = call ptr @strcpy(ptr %dest, ptr %src) %arrayidx = getelementptr inbounds i8, ptr %call, i64 10 store i8 97, ptr %arrayidx, align 1 ret void } declare void @user(ptr %p) define void @test6(ptr %src) { ; CHECK-LABEL: @test6( ; CHECK-NEXT: [[B:%.*]] = alloca [16 x i8], align 1 ; CHECK-NEXT: [[CALL:%.*]] = call ptr @strcpy(ptr [[B]], ptr [[SRC:%.*]]) ; CHECK-NEXT: call void @user(ptr [[B]]) ; CHECK-NEXT: ret void ; %B = alloca [16 x i8] %call = call ptr @strcpy(ptr %B, ptr %src) call void @user(ptr %B) ret void } declare i32 @memcmp(ptr, ptr, i64) define i32 @test_memcmp_const_size(ptr noalias %foo) { ; CHECK-LABEL: @test_memcmp_const_size( ; CHECK-NEXT: entry: ; CHECK-NEXT: [[STACK:%.*]] = alloca [10 x i8], align 1 ; CHECK-NEXT: store i8 49, ptr [[STACK]], align 1 ; CHECK-NEXT: [[GEP_1:%.*]] = getelementptr i8, ptr [[STACK]], i64 1 ; CHECK-NEXT: store i8 50, ptr [[GEP_1]], align 1 ; CHECK-NEXT: [[RES:%.*]] = call i32 @memcmp(ptr nonnull dereferenceable(2) [[FOO:%.*]], ptr nonnull dereferenceable(2) [[STACK]], i64 2) ; CHECK-NEXT: ret i32 [[RES]] ; entry: %stack = alloca [10 x i8] store i8 49, ptr %stack, align 1 %gep.1 = getelementptr i8, ptr %stack, i64 1 store i8 50, ptr %gep.1, align 1 %gep.2 = getelementptr i8, ptr %stack, i64 2 store i8 51, ptr %gep.2, align 1 %gep.3 = getelementptr i8, ptr %stack, i64 3 store i8 52, ptr %gep.3, align 1 %res = call i32 @memcmp(ptr nonnull dereferenceable(2) %foo, ptr nonnull dereferenceable(2) %stack, i64 2) ret i32 %res } define i32 @test_memcmp_variable_size(ptr noalias %foo, i64 %n) { ; CHECK-LABEL: @test_memcmp_variable_size( ; CHECK-NEXT: entry: ; CHECK-NEXT: [[STACK:%.*]] = alloca [10 x i8], align 1 ; CHECK-NEXT: store i8 49, ptr [[STACK]], align 1 ; CHECK-NEXT: [[GEP_1:%.*]] = getelementptr i8, ptr [[STACK]], i64 1 ; CHECK-NEXT: store i8 50, ptr [[GEP_1]], align 1 ; CHECK-NEXT: [[GEP_2:%.*]] = getelementptr i8, ptr [[STACK]], i64 2 ; CHECK-NEXT: store i8 51, ptr [[GEP_2]], align 1 ; CHECK-NEXT: [[GEP_3:%.*]] = getelementptr i8, ptr [[STACK]], i64 3 ; CHECK-NEXT: store i8 52, ptr [[GEP_3]], align 1 ; CHECK-NEXT: [[RES:%.*]] = call i32 @memcmp(ptr nonnull [[FOO:%.*]], ptr nonnull [[STACK]], i64 [[N:%.*]]) ; CHECK-NEXT: ret i32 [[RES]] ; entry: %stack = alloca [10 x i8] store i8 49, ptr %stack, align 1 %gep.1 = getelementptr i8, ptr %stack, i64 1 store i8 50, ptr %gep.1, align 1 %gep.2 = getelementptr i8, ptr %stack, i64 2 store i8 51, ptr %gep.2, align 1 %gep.3 = getelementptr i8, ptr %stack, i64 3 store i8 52, ptr %gep.3, align 1 %res = call i32 @memcmp(ptr nonnull %foo, ptr nonnull %stack, i64 %n) ret i32 %res } declare i32 @bcmp(ptr, ptr, i64) define i1 @test_bcmp_const_size(ptr noalias %foo) { ; CHECK-LABEL: @test_bcmp_const_size( ; CHECK-NEXT: entry: ; CHECK-NEXT: [[STACK:%.*]] = alloca [10 x i8], align 1 ; CHECK-NEXT: store i8 49, ptr [[STACK]], align 1 ; CHECK-NEXT: [[GEP_1:%.*]] = getelementptr i8, ptr [[STACK]], i64 1 ; CHECK-NEXT: store i8 50, ptr [[GEP_1]], align 1 ; CHECK-NEXT: [[CALL:%.*]] = call i32 @bcmp(ptr nonnull dereferenceable(2) [[FOO:%.*]], ptr nonnull dereferenceable(2) [[STACK]], i64 2) ; CHECK-NEXT: [[RES:%.*]] = icmp eq i32 [[CALL]], 0 ; CHECK-NEXT: ret i1 [[RES]] ; entry: %stack = alloca [10 x i8] store i8 49, ptr %stack, align 1 %gep.1 = getelementptr i8, ptr %stack, i64 1 store i8 50, ptr %gep.1, align 1 %gep.2 = getelementptr i8, ptr %stack, i64 2 store i8 51, ptr %gep.2, align 1 %gep.3 = getelementptr i8, ptr %stack, i64 3 store i8 52, ptr %gep.3, align 1 %call = call i32 @bcmp(ptr nonnull dereferenceable(2) %foo, ptr nonnull dereferenceable(2) %stack, i64 2) %res = icmp eq i32 %call, 0 ret i1 %res } define i1 @test_bcmp_variable_size(ptr noalias %foo, i64 %n) { ; CHECK-LABEL: @test_bcmp_variable_size( ; CHECK-NEXT: entry: ; CHECK-NEXT: [[STACK:%.*]] = alloca [10 x i8], align 1 ; CHECK-NEXT: store i8 49, ptr [[STACK]], align 1 ; CHECK-NEXT: [[GEP_1:%.*]] = getelementptr i8, ptr [[STACK]], i64 1 ; CHECK-NEXT: store i8 50, ptr [[GEP_1]], align 1 ; CHECK-NEXT: [[GEP_2:%.*]] = getelementptr i8, ptr [[STACK]], i64 2 ; CHECK-NEXT: store i8 51, ptr [[GEP_2]], align 1 ; CHECK-NEXT: [[GEP_3:%.*]] = getelementptr i8, ptr [[STACK]], i64 3 ; CHECK-NEXT: store i8 52, ptr [[GEP_3]], align 1 ; CHECK-NEXT: [[CALL:%.*]] = call i32 @bcmp(ptr nonnull [[FOO:%.*]], ptr nonnull [[STACK]], i64 [[N:%.*]]) ; CHECK-NEXT: [[RES:%.*]] = icmp eq i32 [[CALL]], 0 ; CHECK-NEXT: ret i1 [[RES]] ; entry: %stack = alloca [10 x i8] store i8 49, ptr %stack, align 1 %gep.1 = getelementptr i8, ptr %stack, i64 1 store i8 50, ptr %gep.1, align 1 %gep.2 = getelementptr i8, ptr %stack, i64 2 store i8 51, ptr %gep.2, align 1 %gep.3 = getelementptr i8, ptr %stack, i64 3 store i8 52, ptr %gep.3, align 1 %call = call i32 @bcmp(ptr nonnull %foo, ptr nonnull %stack, i64 %n) %res = icmp eq i32 %call, 0 ret i1 %res } declare ptr @memchr(ptr, i32, i64) define ptr @test_memchr_const_size() { ; CHECK-LABEL: @test_memchr_const_size( ; CHECK-NEXT: entry: ; CHECK-NEXT: [[STACK:%.*]] = alloca [10 x i8], align 1 ; CHECK-NEXT: store i8 49, ptr [[STACK]], align 1 ; CHECK-NEXT: [[GEP_1:%.*]] = getelementptr i8, ptr [[STACK]], i64 1 ; CHECK-NEXT: store i8 50, ptr [[GEP_1]], align 1 ; CHECK-NEXT: [[CALL:%.*]] = call ptr @memchr(ptr [[STACK]], i32 42, i64 2) ; CHECK-NEXT: ret ptr [[CALL]] ; entry: %stack = alloca [10 x i8] store i8 49, ptr %stack, align 1 %gep.1 = getelementptr i8, ptr %stack, i64 1 store i8 50, ptr %gep.1, align 1 %gep.2 = getelementptr i8, ptr %stack, i64 2 store i8 51, ptr %gep.2, align 1 %gep.3 = getelementptr i8, ptr %stack, i64 3 store i8 52, ptr %gep.3, align 1 %call = call ptr @memchr(ptr %stack, i32 42, i64 2) ret ptr %call } define ptr @test_memchr_variable_size(i64 %n) { ; CHECK-LABEL: @test_memchr_variable_size( ; CHECK-NEXT: entry: ; CHECK-NEXT: [[STACK:%.*]] = alloca [10 x i8], align 1 ; CHECK-NEXT: store i8 49, ptr [[STACK]], align 1 ; CHECK-NEXT: [[GEP_1:%.*]] = getelementptr i8, ptr [[STACK]], i64 1 ; CHECK-NEXT: store i8 50, ptr [[GEP_1]], align 1 ; CHECK-NEXT: [[GEP_2:%.*]] = getelementptr i8, ptr [[STACK]], i64 2 ; CHECK-NEXT: store i8 51, ptr [[GEP_2]], align 1 ; CHECK-NEXT: [[GEP:%.*]] = getelementptr i8, ptr [[STACK]], i64 4 ; CHECK-NEXT: store i8 52, ptr [[GEP]], align 1 ; CHECK-NEXT: [[CALL:%.*]] = call ptr @memchr(ptr [[STACK]], i32 42, i64 [[N:%.*]]) ; CHECK-NEXT: ret ptr [[CALL]] ; entry: %stack = alloca [10 x i8] store i8 49, ptr %stack, align 1 %gep.1 = getelementptr i8, ptr %stack, i64 1 store i8 50, ptr %gep.1, align 1 %gep.2 = getelementptr i8, ptr %stack, i64 2 store i8 51, ptr %gep.2, align 1 %gep = getelementptr i8, ptr %stack, i64 4 store i8 52, ptr %gep, align 1 %call = call ptr @memchr(ptr %stack, i32 42, i64 %n) ret ptr %call } declare ptr @memccpy(ptr, ptr, i32, i64) define ptr @test_memccpy_const_size(ptr %foo) { ; CHECK-LABEL: @test_memccpy_const_size( ; CHECK-NEXT: entry: ; CHECK-NEXT: [[STACK:%.*]] = alloca [10 x i8], align 1 ; CHECK-NEXT: store i8 49, ptr [[STACK]], align 1 ; CHECK-NEXT: [[GEP_1:%.*]] = getelementptr i8, ptr [[STACK]], i64 1 ; CHECK-NEXT: store i8 50, ptr [[GEP_1]], align 1 ; CHECK-NEXT: [[RES:%.*]] = call ptr @memccpy(ptr [[FOO:%.*]], ptr [[STACK]], i32 42, i64 2) ; CHECK-NEXT: ret ptr [[RES]] ; entry: %stack = alloca [10 x i8] store i8 49, ptr %stack, align 1 %gep.1 = getelementptr i8, ptr %stack, i64 1 store i8 50, ptr %gep.1, align 1 %gep.2 = getelementptr i8, ptr %stack, i64 2 store i8 51, ptr %gep.2, align 1 %gep.3 = getelementptr i8, ptr %stack, i64 3 store i8 52, ptr %gep.3, align 1 %res = call ptr @memccpy(ptr %foo, ptr %stack, i32 42, i64 2) ret ptr %res } define ptr @test_memccpy_variable_size(ptr %foo, i64 %n) { ; CHECK-LABEL: @test_memccpy_variable_size( ; CHECK-NEXT: entry: ; CHECK-NEXT: [[STACK:%.*]] = alloca [10 x i8], align 1 ; CHECK-NEXT: store i8 49, ptr [[STACK]], align 1 ; CHECK-NEXT: [[GEP_1:%.*]] = getelementptr i8, ptr [[STACK]], i64 1 ; CHECK-NEXT: store i8 50, ptr [[GEP_1]], align 1 ; CHECK-NEXT: [[GEP_2:%.*]] = getelementptr i8, ptr [[STACK]], i64 2 ; CHECK-NEXT: store i8 51, ptr [[GEP_2]], align 1 ; CHECK-NEXT: [[GEP_3:%.*]] = getelementptr i8, ptr [[STACK]], i64 3 ; CHECK-NEXT: store i8 52, ptr [[GEP_3]], align 1 ; CHECK-NEXT: [[RES:%.*]] = call ptr @memccpy(ptr [[FOO:%.*]], ptr [[STACK]], i32 42, i64 [[N:%.*]]) ; CHECK-NEXT: ret ptr [[RES]] ; entry: %stack = alloca [10 x i8] store i8 49, ptr %stack, align 1 %gep.1 = getelementptr i8, ptr %stack, i64 1 store i8 50, ptr %gep.1, align 1 %gep.2 = getelementptr i8, ptr %stack, i64 2 store i8 51, ptr %gep.2, align 1 %gep.3 = getelementptr i8, ptr %stack, i64 3 store i8 52, ptr %gep.3, align 1 %res = call ptr @memccpy(ptr %foo, ptr %stack, i32 42, i64 %n) ret ptr %res } ; Make sure memccpy does not kill any stores, because it is not known how many ; bytes are written. define ptr @test_memccpy_const_size_does_not_kill_stores(ptr noalias %dest, ptr noalias %foo) { ; CHECK-LABEL: @test_memccpy_const_size_does_not_kill_stores( ; CHECK-NEXT: entry: ; CHECK-NEXT: store i8 49, ptr [[DEST:%.*]], align 1 ; CHECK-NEXT: [[GEP_1:%.*]] = getelementptr i8, ptr [[DEST]], i64 1 ; CHECK-NEXT: store i8 50, ptr [[GEP_1]], align 1 ; CHECK-NEXT: [[GEP_2:%.*]] = getelementptr i8, ptr [[DEST]], i64 2 ; CHECK-NEXT: store i8 51, ptr [[GEP_2]], align 1 ; CHECK-NEXT: [[GEP_3:%.*]] = getelementptr i8, ptr [[DEST]], i64 3 ; CHECK-NEXT: store i8 52, ptr [[GEP_3]], align 1 ; CHECK-NEXT: [[RES:%.*]] = call ptr @memccpy(ptr [[DEST]], ptr [[FOO:%.*]], i32 42, i64 2) ; CHECK-NEXT: ret ptr [[RES]] ; entry: store i8 49, ptr %dest, align 1 %gep.1 = getelementptr i8, ptr %dest, i64 1 store i8 50, ptr %gep.1, align 1 %gep.2 = getelementptr i8, ptr %dest, i64 2 store i8 51, ptr %gep.2, align 1 %gep.3 = getelementptr i8, ptr %dest, i64 3 store i8 52, ptr %gep.3, align 1 %res = call ptr @memccpy(ptr %dest, ptr %foo, i32 42, i64 2) ret ptr %res } define void @dse_strcpy(ptr nocapture readonly %src) { ; CHECK-LABEL: @dse_strcpy( ; CHECK-NEXT: [[A:%.*]] = alloca [256 x i8], align 16 ; CHECK-NEXT: call void @llvm.lifetime.start.p0(i64 256, ptr nonnull [[A]]) ; CHECK-NEXT: call void @llvm.lifetime.end.p0(i64 256, ptr nonnull [[A]]) ; CHECK-NEXT: ret void ; %a = alloca [256 x i8], align 16 call void @llvm.lifetime.start.p0(i64 256, ptr nonnull %a) call ptr @strcpy(ptr nonnull %a, ptr nonnull dereferenceable(1) %src) call void @llvm.lifetime.end.p0(i64 256, ptr nonnull %a) ret void } define void @dse_strncpy(ptr nocapture readonly %src) { ; CHECK-LABEL: @dse_strncpy( ; CHECK-NEXT: [[A:%.*]] = alloca [256 x i8], align 16 ; CHECK-NEXT: call void @llvm.lifetime.start.p0(i64 256, ptr nonnull [[A]]) ; CHECK-NEXT: call void @llvm.lifetime.end.p0(i64 256, ptr nonnull [[A]]) ; CHECK-NEXT: ret void ; %a = alloca [256 x i8], align 16 call void @llvm.lifetime.start.p0(i64 256, ptr nonnull %a) call ptr @strncpy(ptr nonnull %a, ptr nonnull dereferenceable(1) %src, i64 6) call void @llvm.lifetime.end.p0(i64 256, ptr nonnull %a) ret void } define void @dse_strcat(ptr nocapture readonly %src) { ; CHECK-LABEL: @dse_strcat( ; CHECK-NEXT: [[A:%.*]] = alloca [256 x i8], align 16 ; CHECK-NEXT: call void @llvm.lifetime.start.p0(i64 256, ptr nonnull [[A]]) ; CHECK-NEXT: call void @llvm.lifetime.end.p0(i64 256, ptr nonnull [[A]]) ; CHECK-NEXT: ret void ; %a = alloca [256 x i8], align 16 call void @llvm.lifetime.start.p0(i64 256, ptr nonnull %a) call ptr @strcat(ptr nonnull %a, ptr nonnull dereferenceable(1) %src) call void @llvm.lifetime.end.p0(i64 256, ptr nonnull %a) ret void } define void @dse_strncat(ptr nocapture readonly %src) { ; CHECK-LABEL: @dse_strncat( ; CHECK-NEXT: [[A:%.*]] = alloca [256 x i8], align 16 ; CHECK-NEXT: call void @llvm.lifetime.start.p0(i64 256, ptr nonnull [[A]]) ; CHECK-NEXT: call void @llvm.lifetime.end.p0(i64 256, ptr nonnull [[A]]) ; CHECK-NEXT: ret void ; %a = alloca [256 x i8], align 16 call void @llvm.lifetime.start.p0(i64 256, ptr nonnull %a) call ptr @strncat(ptr nonnull %a, ptr nonnull dereferenceable(1) %src, i64 6) call void @llvm.lifetime.end.p0(i64 256, ptr nonnull %a) ret void } declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) declare void @llvm.memset.p0.i64(ptr nocapture, i8, i64, i1) nounwind ; Test that strncpy/memset overwriting each other is optimized out ; strncpy -> memset, full overwrite define void @dse_strncpy_test1(ptr noalias %out, ptr noalias %in) { ; CHECK-LABEL: @dse_strncpy_test1( ; CHECK-NEXT: tail call void @llvm.memset.p0.i64(ptr [[OUT:%.*]], i8 42, i64 100, i1 false) ; CHECK-NEXT: ret void ; %call = tail call ptr @strncpy(ptr %out, ptr %in, i64 100) tail call void @llvm.memset.p0.i64(ptr %out, i8 42, i64 100, i1 false) ret void } ; strncpy -> memset, partial overwrite define void @dse_strncpy_test2(ptr noalias %out, ptr noalias %in) { ; CHECK-LABEL: @dse_strncpy_test2( ; CHECK-NEXT: [[CALL:%.*]] = tail call ptr @strncpy(ptr [[OUT:%.*]], ptr [[IN:%.*]], i64 100) ; CHECK-NEXT: tail call void @llvm.memset.p0.i64(ptr [[OUT]], i8 42, i64 99, i1 false) ; CHECK-NEXT: ret void ; %call = tail call ptr @strncpy(ptr %out, ptr %in, i64 100) tail call void @llvm.memset.p0.i64(ptr %out, i8 42, i64 99, i1 false) ret void } ; strncpy -> memset, different destination define void @dse_strncpy_test3(ptr noalias %out1, ptr noalias %out2, ptr noalias %in) { ; CHECK-LABEL: @dse_strncpy_test3( ; CHECK-NEXT: [[CALL:%.*]] = tail call ptr @strncpy(ptr [[OUT1:%.*]], ptr [[IN:%.*]], i64 100) ; CHECK-NEXT: tail call void @llvm.memset.p0.i64(ptr [[OUT2:%.*]], i8 42, i64 100, i1 false) ; CHECK-NEXT: ret void ; %call = tail call ptr @strncpy(ptr %out1, ptr %in, i64 100) tail call void @llvm.memset.p0.i64(ptr %out2, i8 42, i64 100, i1 false) ret void } ; memset -> strncpy, full overwrite define void @dse_strncpy_test4(ptr noalias %out, ptr noalias %in) { ; CHECK-LABEL: @dse_strncpy_test4( ; CHECK-NEXT: [[CALL:%.*]] = tail call ptr @strncpy(ptr [[OUT:%.*]], ptr [[IN:%.*]], i64 100) ; CHECK-NEXT: ret void ; tail call void @llvm.memset.p0.i64(ptr %out, i8 42, i64 100, i1 false) %call = tail call ptr @strncpy(ptr %out, ptr %in, i64 100) ret void } ; memset -> strncpy, partial overwrite define void @dse_strncpy_test5(ptr noalias %out, ptr noalias %in) { ; CHECK-LABEL: @dse_strncpy_test5( ; CHECK-NEXT: [[TMP1:%.*]] = getelementptr inbounds i8, ptr [[OUT:%.*]], i64 99 ; CHECK-NEXT: tail call void @llvm.memset.p0.i64(ptr align 1 [[TMP1]], i8 42, i64 1, i1 false) ; CHECK-NEXT: [[CALL:%.*]] = tail call ptr @strncpy(ptr [[OUT]], ptr [[IN:%.*]], i64 99) ; CHECK-NEXT: ret void ; tail call void @llvm.memset.p0.i64(ptr %out, i8 42, i64 100, i1 false) %call = tail call ptr @strncpy(ptr %out, ptr %in, i64 99) ret void } ; memset -> strncpy, different destination define void @dse_strncpy_test6(ptr noalias %out1, ptr noalias %out2, ptr noalias %in) { ; CHECK-LABEL: @dse_strncpy_test6( ; CHECK-NEXT: tail call void @llvm.memset.p0.i64(ptr [[OUT1:%.*]], i8 42, i64 100, i1 false) ; CHECK-NEXT: [[CALL:%.*]] = tail call ptr @strncpy(ptr [[OUT2:%.*]], ptr [[IN:%.*]], i64 100) ; CHECK-NEXT: ret void ; tail call void @llvm.memset.p0.i64(ptr %out1, i8 42, i64 100, i1 false) %call = tail call ptr @strncpy(ptr %out2, ptr %in, i64 100) ret void }