1 ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
2 ; Test that the memset library call simplifier works correctly.
4 ; RUN: opt < %s -instcombine -S | FileCheck %s
6 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"
8 declare i8* @memset(i8*, i32, i32)
9 declare void @llvm.memset.p0i8.i32(i8* nocapture writeonly, i8, i32, i32, i1)
10 declare noalias i8* @malloc(i32) #1
12 ; Check memset(mem1, val, size) -> llvm.memset(mem1, val, size, 1).
14 define i8* @test_simplify1(i8* %mem, i32 %val, i32 %size) {
15 ; CHECK-LABEL: @test_simplify1(
16 ; CHECK-NEXT: [[TMP1:%.*]] = trunc i32 [[VAL:%.*]] to i8
17 ; CHECK-NEXT: call void @llvm.memset.p0i8.i32(i8* align 1 [[MEM:%.*]], i8 [[TMP1]], i32 [[SIZE:%.*]], i1 false)
18 ; CHECK-NEXT: ret i8* [[MEM]]
20 %ret = call i8* @memset(i8* %mem, i32 %val, i32 %size)
24 define i8* @pr25892_lite(i32 %size) #0 {
25 ; CHECK-LABEL: @pr25892_lite(
26 ; CHECK-NEXT: [[CALLOC:%.*]] = call i8* @calloc(i32 1, i32 [[SIZE:%.*]])
27 ; CHECK-NEXT: ret i8* [[CALLOC]]
29 %call1 = call i8* @malloc(i32 %size) #1
30 %call2 = call i8* @memset(i8* %call1, i32 0, i32 %size) #1
34 ; FIXME: A memset intrinsic should be handled similarly to a memset() libcall.
36 define i8* @malloc_and_memset_intrinsic(i32 %n) #0 {
37 ; CHECK-LABEL: @malloc_and_memset_intrinsic(
38 ; CHECK-NEXT: [[CALL:%.*]] = call i8* @malloc(i32 [[N:%.*]])
39 ; CHECK-NEXT: call void @llvm.memset.p0i8.i32(i8* align 1 [[CALL]], i8 0, i32 [[N]], i1 false)
40 ; CHECK-NEXT: ret i8* [[CALL]]
42 %call = call i8* @malloc(i32 %n)
43 call void @llvm.memset.p0i8.i32(i8* %call, i8 0, i32 %n, i32 1, i1 false)
47 ; This should not create a calloc and should not crash the compiler.
49 define i8* @notmalloc_memset(i32 %size, i8*(i32)* %notmalloc) {
50 ; CHECK-LABEL: @notmalloc_memset(
51 ; CHECK-NEXT: [[CALL1:%.*]] = call i8* [[NOTMALLOC:%.*]](i32 [[SIZE:%.*]]) #0
52 ; CHECK-NEXT: call void @llvm.memset.p0i8.i32(i8* align 1 [[CALL1]], i8 0, i32 [[SIZE]], i1 false) #0
53 ; CHECK-NEXT: ret i8* [[CALL1]]
55 %call1 = call i8* %notmalloc(i32 %size) #1
56 %call2 = call i8* @memset(i8* %call1, i32 0, i32 %size) #1
60 ; FIXME: memset(malloc(x), 0, x) -> calloc(1, x)
61 ; This doesn't fire currently because the malloc has more than one use.
63 define float* @pr25892(i32 %size) #0 {
64 ; CHECK-LABEL: @pr25892(
66 ; CHECK-NEXT: [[CALL:%.*]] = tail call i8* @malloc(i32 [[SIZE:%.*]]) #0
67 ; CHECK-NEXT: [[CMP:%.*]] = icmp eq i8* [[CALL]], null
68 ; CHECK-NEXT: br i1 [[CMP]], label [[CLEANUP:%.*]], label [[IF_END:%.*]]
70 ; CHECK-NEXT: [[BC:%.*]] = bitcast i8* [[CALL]] to float*
71 ; CHECK-NEXT: call void @llvm.memset.p0i8.i32(i8* nonnull align 1 [[CALL]], i8 0, i32 [[SIZE]], i1 false) #0
72 ; CHECK-NEXT: br label [[CLEANUP]]
74 ; CHECK-NEXT: [[RETVAL_0:%.*]] = phi float* [ [[BC]], [[IF_END]] ], [ null, [[ENTRY:%.*]] ]
75 ; CHECK-NEXT: ret float* [[RETVAL_0]]
78 %call = tail call i8* @malloc(i32 %size) #1
79 %cmp = icmp eq i8* %call, null
80 br i1 %cmp, label %cleanup, label %if.end
82 %bc = bitcast i8* %call to float*
83 %call2 = tail call i8* @memset(i8* nonnull %call, i32 0, i32 %size) #1
86 %retval.0 = phi float* [ %bc, %if.end ], [ null, %entry ]
90 ; If there's a calloc transform, the store must also be eliminated.
92 define i8* @buffer_is_modified_then_memset(i32 %size) {
93 ; CHECK-LABEL: @buffer_is_modified_then_memset(
94 ; CHECK-NEXT: [[PTR:%.*]] = tail call i8* @malloc(i32 [[SIZE:%.*]]) #0
95 ; CHECK-NEXT: store i8 1, i8* [[PTR]], align 1
96 ; CHECK-NEXT: call void @llvm.memset.p0i8.i32(i8* nonnull align 1 [[PTR]], i8 0, i32 [[SIZE]], i1 false) #0
97 ; CHECK-NEXT: ret i8* [[PTR]]
99 %ptr = tail call i8* @malloc(i32 %size) #1
100 store i8 1, i8* %ptr ;; fdata[0] = 1;
101 %memset = tail call i8* @memset(i8* nonnull %ptr, i32 0, i32 %size) #1
105 define i8* @memset_size_select(i1 %b, i8* %ptr) {
106 ; CHECK-LABEL: @memset_size_select(
107 ; CHECK-NEXT: [[SIZE:%.*]] = select i1 [[B:%.*]], i32 10, i32 50
108 ; CHECK-NEXT: call void @llvm.memset.p0i8.i32(i8* nonnull align 1 dereferenceable(10) [[PTR:%.*]], i8 0, i32 [[SIZE]], i1 false) #0
109 ; CHECK-NEXT: ret i8* [[PTR]]
111 %size = select i1 %b, i32 10, i32 50
112 %memset = tail call i8* @memset(i8* nonnull %ptr, i32 0, i32 %size) #1
117 define i8* @memset_size_select2(i1 %b, i8* %ptr) {
118 ; CHECK-LABEL: @memset_size_select2(
119 ; CHECK-NEXT: [[SIZE:%.*]] = select i1 [[B:%.*]], i32 10, i32 50
120 ; CHECK-NEXT: call void @llvm.memset.p0i8.i32(i8* nonnull align 1 dereferenceable(80) [[PTR:%.*]], i8 0, i32 [[SIZE]], i1 false) #0
121 ; CHECK-NEXT: ret i8* [[PTR]]
123 %size = select i1 %b, i32 10, i32 50
124 %memset = tail call i8* @memset(i8* nonnull dereferenceable(80) %ptr, i32 0, i32 %size) #1
128 define i8* @memset_size_select3(i1 %b, i8* %ptr) {
129 ; CHECK-LABEL: @memset_size_select3(
130 ; CHECK-NEXT: [[SIZE:%.*]] = select i1 [[B:%.*]], i32 10, i32 50
131 ; CHECK-NEXT: call void @llvm.memset.p0i8.i32(i8* nonnull align 1 dereferenceable(40) [[PTR:%.*]], i8 0, i32 [[SIZE]], i1 false)
132 ; CHECK-NEXT: ret i8* [[PTR]]
134 %size = select i1 %b, i32 10, i32 50
135 %memset = tail call i8* @memset(i8* dereferenceable_or_null(40) %ptr, i32 0, i32 %size)
139 define i8* @memset_size_select4(i1 %b, i8* %ptr) {
140 ; CHECK-LABEL: @memset_size_select4(
141 ; CHECK-NEXT: [[SIZE:%.*]] = select i1 [[B:%.*]], i32 10, i32 50
142 ; CHECK-NEXT: call void @llvm.memset.p0i8.i32(i8* nonnull align 1 dereferenceable(40) [[PTR:%.*]], i8 0, i32 [[SIZE]], i1 false) #0
143 ; CHECK-NEXT: ret i8* [[PTR]]
145 %size = select i1 %b, i32 10, i32 50
146 %memset = tail call i8* @memset(i8* nonnull dereferenceable_or_null(40) %ptr, i32 0, i32 %size) #1
150 define i8* @memset_size_ashr(i1 %b, i8* %ptr, i32 %v) {
151 ; CHECK-LABEL: @memset_size_ashr(
152 ; CHECK-NEXT: [[SIZE:%.*]] = ashr i32 -2, [[V:%.*]]
153 ; CHECK-NEXT: call void @llvm.memset.p0i8.i32(i8* nonnull align 1 [[PTR:%.*]], i8 0, i32 [[SIZE]], i1 false) #0
154 ; CHECK-NEXT: ret i8* [[PTR]]
156 %size = ashr i32 -2, %v
157 %memset = tail call i8* @memset(i8* nonnull %ptr, i32 0, i32 %size) #1
161 define i8* @memset_attrs1(i1 %b, i8* %ptr, i32 %size) {
162 ; CHECK-LABEL: @memset_attrs1(
163 ; CHECK-NEXT: call void @llvm.memset.p0i8.i32(i8* align 1 dereferenceable_or_null(40) [[PTR:%.*]], i8 0, i32 [[SIZE:%.*]], i1 false) #0
164 ; CHECK-NEXT: ret i8* [[PTR]]
166 %memset = tail call i8* @memset(i8* dereferenceable_or_null(40) %ptr, i32 0, i32 %size) #1
170 ; be sure to drop nonnull since size is unknown and can be 0
171 ; do not change dereferenceable attribute
172 define i8* @memset_attrs2(i1 %b, i8* %ptr, i32 %size) {
173 ; CHECK-LABEL: @memset_attrs2(
174 ; CHECK-NEXT: call void @llvm.memset.p0i8.i32(i8* nonnull align 1 dereferenceable(40) [[PTR:%.*]], i8 0, i32 [[SIZE:%.*]], i1 false) #0
175 ; CHECK-NEXT: ret i8* [[PTR]]
177 %memset = tail call i8* @memset(i8* nonnull dereferenceable(40) %ptr, i32 0, i32 %size) #1
181 ; size is unknown, just copy attrs, no changes in attrs
182 define i8* @memset_attrs3(i1 %b, i8* %ptr, i32 %size) {
183 ; CHECK-LABEL: @memset_attrs3(
184 ; CHECK-NEXT: call void @llvm.memset.p0i8.i32(i8* nonnull align 1 dereferenceable_or_null(40) [[PTR:%.*]], i8 0, i32 [[SIZE:%.*]], i1 false) #0
185 ; CHECK-NEXT: ret i8* [[PTR]]
187 %memset = tail call i8* @memset(i8* nonnull dereferenceable_or_null(40) %ptr, i32 0, i32 %size) #1
191 ; be sure to drop nonnull since size is unknown and can be 0
192 define i8* @memset_attrs4(i1 %b, i8* %ptr, i32 %size) {
193 ; CHECK-LABEL: @memset_attrs4(
194 ; CHECK-NEXT: call void @llvm.memset.p0i8.i32(i8* nonnull align 1 [[PTR:%.*]], i8 0, i32 [[SIZE:%.*]], i1 false) #0
195 ; CHECK-NEXT: ret i8* [[PTR]]
197 %memset = tail call i8* @memset(i8* nonnull %ptr, i32 0, i32 %size) #1
202 attributes #0 = { nounwind ssp uwtable }
203 attributes #1 = { nounwind }
204 attributes #2 = { nounwind readnone }