1 ; RUN: opt < %s -instcombine -S | FileCheck %s
3 define i32 @main(i32 %argc, i8** %argv) {
6 %malloc_206 = tail call i8* @malloc(i32 mul (i32 ptrtoint (i8* getelementptr (i8* null, i32 1) to i32), i32 10))
7 store i8* %malloc_206, i8** %c_19
8 %tmp_207 = load i8** %c_19
9 tail call void @free(i8* %tmp_207)
11 ; CHECK-NEXT: ret i32 0
14 declare noalias i8* @calloc(i32, i32) nounwind
15 declare noalias i8* @malloc(i32)
16 declare void @free(i8*)
20 ; CHECK-NEXT: ret i1 false
21 %m = call i8* @malloc(i32 1)
22 %z = icmp eq i8* %m, null
23 call void @free(i8* %m)
27 declare void @llvm.lifetime.start(i64, i8*)
28 declare void @llvm.lifetime.end(i64, i8*)
29 declare i64 @llvm.objectsize.i64(i8*, i1)
30 declare void @llvm.memcpy.p0i8.p0i8.i32(i8* nocapture, i8* nocapture, i32, i32, i1) nounwind
31 declare void @llvm.memmove.p0i8.p0i8.i32(i8* nocapture, i8* nocapture, i32, i32, i1) nounwind
32 declare void @llvm.memset.p0i8.i32(i8*, i8, i32, i32, i1) nounwind
34 define void @test3(i8* %src) {
35 ; CHECK-LABEL: @test3(
36 ; CHECK-NEXT: ret void
37 %a = call noalias i8* @malloc(i32 10)
38 call void @llvm.lifetime.start(i64 10, i8* %a)
39 call void @llvm.lifetime.end(i64 10, i8* %a)
40 %size = call i64 @llvm.objectsize.i64(i8* %a, i1 true)
42 call void @llvm.memcpy.p0i8.p0i8.i32(i8* %a, i8* %src, i32 32, i32 1, i1 false)
43 call void @llvm.memmove.p0i8.p0i8.i32(i8* %a, i8* %src, i32 32, i32 1, i1 false)
44 call void @llvm.memset.p0i8.i32(i8* %a, i8 5, i32 32, i32 1, i1 false)
45 %alloc2 = call noalias i8* @calloc(i32 5, i32 7) nounwind
46 %z = icmp ne i8* %alloc2, null
50 ;; This used to crash.
51 define void @test4() {
52 ; CHECK-LABEL: @test4(
53 ; CHECK-NEXT: ret void
54 %A = call i8* @malloc(i32 16000)
55 %B = bitcast i8* %A to double*
56 %C = bitcast double* %B to i8*
57 call void @free(i8* %C)
61 ; CHECK-LABEL: @test5(
62 define void @test5(i8* %ptr, i8** %esc) {
63 ; CHECK-NEXT: call i8* @malloc
64 ; CHECK-NEXT: call i8* @malloc
65 ; CHECK-NEXT: call i8* @malloc
66 ; CHECK-NEXT: call i8* @malloc
67 ; CHECK-NEXT: call i8* @malloc
68 ; CHECK-NEXT: call i8* @malloc
69 ; CHECK-NEXT: call i8* @malloc
70 ; CHECK-NEXT: call void @llvm.memcpy
71 ; CHECK-NEXT: call void @llvm.memmove
73 ; CHECK-NEXT: call void @llvm.memcpy
74 ; CHECK-NEXT: call void @llvm.memmove
75 ; CHECK-NEXT: call void @llvm.memset
76 ; CHECK-NEXT: store volatile
78 %a = call i8* @malloc(i32 700)
79 %b = call i8* @malloc(i32 700)
80 %c = call i8* @malloc(i32 700)
81 %d = call i8* @malloc(i32 700)
82 %e = call i8* @malloc(i32 700)
83 %f = call i8* @malloc(i32 700)
84 %g = call i8* @malloc(i32 700)
85 call void @llvm.memcpy.p0i8.p0i8.i32(i8* %ptr, i8* %a, i32 32, i32 1, i1 false)
86 call void @llvm.memmove.p0i8.p0i8.i32(i8* %ptr, i8* %b, i32 32, i32 1, i1 false)
87 store i8* %c, i8** %esc
88 call void @llvm.memcpy.p0i8.p0i8.i32(i8* %d, i8* %ptr, i32 32, i32 1, i1 true)
89 call void @llvm.memmove.p0i8.p0i8.i32(i8* %e, i8* %ptr, i32 32, i32 1, i1 true)
90 call void @llvm.memset.p0i8.i32(i8* %f, i8 5, i32 32, i32 1, i1 true)
91 store volatile i8 4, i8* %g
95 ;; When a basic block contains only a call to free and this block is accessed
96 ;; through a test of the argument of free against null, move the call in the
98 ;; Using simplifycfg will remove the empty basic block and the branch operation
99 ;; Then, performing a dead elimination will remove the comparison.
100 ;; This is what happens with -O1 and upper.
101 ; CHECK-LABEL: @test6(
102 define void @test6(i8* %foo) minsize {
103 ; CHECK: %tobool = icmp eq i8* %foo, null
104 ;; Call to free moved
105 ; CHECK-NEXT: tail call void @free(i8* %foo)
106 ; CHECK-NEXT: br i1 %tobool, label %if.end, label %if.then
108 ;; Block is now empty and may be simplified by simplifycfg
109 ; CHECK-NEXT: br label %if.end
111 ; CHECK-NEXT: ret void
113 %tobool = icmp eq i8* %foo, null
114 br i1 %tobool, label %if.end, label %if.then
116 if.then: ; preds = %entry
117 tail call void @free(i8* %foo)
120 if.end: ; preds = %entry, %if.then
124 declare i8* @_ZnwmRKSt9nothrow_t(i64, i8*) nobuiltin
125 declare void @_ZdlPvRKSt9nothrow_t(i8*, i8*) nobuiltin
126 declare i32 @__gxx_personality_v0(...)
127 declare void @_ZN1AC2Ev(i8* %this)
129 ; CHECK-LABEL: @test7(
130 define void @test7() {
133 ; CHECK-NOT: call {{.*}}@_ZnwmRKSt9nothrow_t(
134 %call.i = tail call i8* @_ZnwmRKSt9nothrow_t(i64 1, i8* %nt) builtin nounwind
135 invoke void @_ZN1AC2Ev(i8* undef)
136 to label %.noexc.i unwind label %lpad.i
138 .noexc.i: ; preds = %entry
141 lpad.i: ; preds = %entry
142 %0 = landingpad { i8*, i32 } personality i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*) cleanup
143 ; CHECK-NOT: call {{.*}}@_ZdlPvRKSt9nothrow_t(
144 call void @_ZdlPvRKSt9nothrow_t(i8* %call.i, i8* %nt) builtin nounwind
145 resume { i8*, i32 } %0
148 declare i8* @_Znwm(i64) nobuiltin
149 declare void @_ZdlPvm(i8*, i64) nobuiltin
150 declare i8* @_Znwj(i32) nobuiltin
151 declare void @_ZdlPvj(i8*, i32) nobuiltin
152 declare i8* @_Znam(i64) nobuiltin
153 declare void @_ZdaPvm(i8*, i64) nobuiltin
154 declare i8* @_Znaj(i32) nobuiltin
155 declare void @_ZdaPvj(i8*, i32) nobuiltin
157 ; CHECK-LABEL: @test8(
158 define void @test8() {
160 %nwm = call i8* @_Znwm(i64 32) builtin
161 call void @_ZdlPvm(i8* %nwm, i64 32) builtin
162 %nwj = call i8* @_Znwj(i32 32) builtin
163 call void @_ZdlPvj(i8* %nwj, i32 32) builtin
164 %nam = call i8* @_Znam(i64 32) builtin
165 call void @_ZdaPvm(i8* %nam, i64 32) builtin
166 %naj = call i8* @_Znaj(i32 32) builtin
167 call void @_ZdaPvj(i8* %naj, i32 32) builtin