1 ; RUN: opt -mtriple=x86_64-pc-windows-msvc -winehprepare -S -o - < %s | FileCheck %s
3 ; This test describes two difficult cases in sinking allocas into child frames.
4 ; We don't currently do this optimization, but we'll need to tweak these tests
7 ; This test is based on the following code:
9 ; // In this case we can sink the alloca from the parent into the catch because
10 ; // the lifetime is limited to the catch.
11 ; extern "C" void may_throw();
12 ; extern "C" void sink_alloca_to_catch() {
16 ; volatile int only_used_in_catch = 42;
20 ; // In this case we cannot. The variable should live as long as the parent
22 ; extern "C" void use_catch_var(int *);
23 ; extern "C" void dont_sink_alloca_to_catch(int n) {
24 ; int live_in_out_catch = 0;
29 ; use_catch_var(&live_in_out_catch);
35 target datalayout = "e-m:w-i64:64-f80:128-n8:16:32:64-S128"
36 target triple = "x86_64-pc-windows-msvc"
38 declare void @may_throw() #1
39 declare i32 @__CxxFrameHandler3(...)
40 declare i32 @llvm.eh.typeid.for(i8*) #2
41 declare void @llvm.eh.begincatch(i8* nocapture, i8* nocapture) #3
42 declare void @llvm.eh.endcatch() #3
44 %rtti.TypeDescriptor2 = type { i8**, i8*, [3 x i8] }
45 %eh.CatchHandlerType = type { i32, i8* }
47 $"\01??_R0H@8" = comdat any
49 @"\01??_7type_info@@6B@" = external constant i8*
50 @"\01??_R0H@8" = linkonce_odr global %rtti.TypeDescriptor2 { i8** @"\01??_7type_info@@6B@", i8* null, [3 x i8] c".H\00" }, comdat
51 @llvm.eh.handlertype.H.0 = private unnamed_addr constant %eh.CatchHandlerType { i32 0, i8* bitcast (%rtti.TypeDescriptor2* @"\01??_R0H@8" to i8*) }, section "llvm.metadata"
53 ; Function Attrs: uwtable
54 define void @sink_alloca_to_catch() #0 {
57 %only_used_in_catch = alloca i32, align 4
58 invoke void @may_throw()
59 to label %try.cont unwind label %lpad
61 lpad: ; preds = %entry
62 %1 = landingpad { i8*, i32 } personality i8* bitcast (i32 (...)* @__CxxFrameHandler3 to i8*)
63 catch %eh.CatchHandlerType* @llvm.eh.handlertype.H.0
64 %2 = extractvalue { i8*, i32 } %1, 1
65 %3 = tail call i32 @llvm.eh.typeid.for(i8* bitcast (%eh.CatchHandlerType* @llvm.eh.handlertype.H.0 to i8*)) #3
66 %matches = icmp eq i32 %2, %3
67 br i1 %matches, label %catch, label %eh.resume
69 catch: ; preds = %lpad
70 %4 = extractvalue { i8*, i32 } %1, 0
71 call void @llvm.eh.begincatch(i8* %4, i8* null) #3
72 store volatile i32 42, i32* %only_used_in_catch, align 4
73 tail call void @llvm.eh.endcatch() #3
76 try.cont: ; preds = %entry, %catch
79 eh.resume: ; preds = %lpad
80 resume { i8*, i32 } %1
83 ; CHECK-LABEL: define void @sink_alloca_to_catch()
84 ; CHECK: call void (...) @llvm.frameescape(i32* %only_used_in_catch)
86 declare void @use_catch_var(i32*) #1
88 ; Function Attrs: uwtable
89 define void @dont_sink_alloca_to_catch(i32 %n) #0 {
92 %n.addr = alloca i32, align 4
93 %live_in_out_catch = alloca i32, align 4
94 %exn.slot = alloca i8*
95 %ehselector.slot = alloca i32
96 store i32 %n, i32* %n.addr, align 4
99 while.cond: ; preds = %try.cont, %entry
100 %1 = load i32, i32* %n.addr, align 4
101 %cmp = icmp sgt i32 %1, 0
102 br i1 %cmp, label %while.body, label %while.end
104 while.body: ; preds = %while.cond
105 invoke void @may_throw()
106 to label %invoke.cont unwind label %lpad
108 invoke.cont: ; preds = %while.body
111 lpad: ; preds = %while.body
112 %2 = landingpad { i8*, i32 } personality i8* bitcast (i32 (...)* @__CxxFrameHandler3 to i8*)
113 catch i8* bitcast (%eh.CatchHandlerType* @llvm.eh.handlertype.H.0 to i8*)
114 %3 = extractvalue { i8*, i32 } %2, 0
115 store i8* %3, i8** %exn.slot
116 %4 = extractvalue { i8*, i32 } %2, 1
117 store i32 %4, i32* %ehselector.slot
118 br label %catch.dispatch
120 catch.dispatch: ; preds = %lpad
121 %sel = load i32, i32* %ehselector.slot
122 %5 = call i32 @llvm.eh.typeid.for(i8* bitcast (%eh.CatchHandlerType* @llvm.eh.handlertype.H.0 to i8*)) #3
123 %matches = icmp eq i32 %sel, %5
124 br i1 %matches, label %catch, label %eh.resume
126 catch: ; preds = %catch.dispatch
127 %exn = load i8*, i8** %exn.slot
128 call void @llvm.eh.begincatch(i8* %exn, i8* null) #3
129 invoke void @use_catch_var(i32* %live_in_out_catch)
130 to label %invoke.cont2 unwind label %lpad1
132 invoke.cont2: ; preds = %catch
133 call void @llvm.eh.endcatch() #3
136 try.cont: ; preds = %invoke.cont2, %invoke.cont
137 %6 = load i32, i32* %0
138 %7 = load i32, i32* %n.addr, align 4
139 %dec = add nsw i32 %7, -1
140 store i32 %dec, i32* %n.addr, align 4
143 lpad1: ; preds = %catch
144 %8 = landingpad { i8*, i32 } personality i8* bitcast (i32 (...)* @__CxxFrameHandler3 to i8*)
146 %9 = extractvalue { i8*, i32 } %8, 0
147 store i8* %9, i8** %exn.slot
148 %10 = extractvalue { i8*, i32 } %8, 1
149 store i32 %10, i32* %ehselector.slot
150 call void @llvm.eh.endcatch() #3
153 while.end: ; preds = %while.cond
156 eh.resume: ; preds = %lpad1, %catch.dispatch
157 %exn3 = load i8*, i8** %exn.slot
158 %sel4 = load i32, i32* %ehselector.slot
159 %lpad.val = insertvalue { i8*, i32 } undef, i8* %exn3, 0
160 %lpad.val5 = insertvalue { i8*, i32 } %lpad.val, i32 %sel4, 1
161 resume { i8*, i32 } %lpad.val5
164 ; CHECK-LABEL: define void @dont_sink_alloca_to_catch(i32 %n)
165 ; CHECK: call void (...) @llvm.frameescape(i32* %live_in_out_catch)
167 ; CHECK-LABEL: define internal i8* @sink_alloca_to_catch.catch(i8*, i8*)
168 ; CHECK: %only_used_in_catch.i8 = call i8* @llvm.framerecover({{.*}}, i32 0)
169 ; CHECK: %only_used_in_catch = bitcast
171 ; CHECK-LABEL: define internal i8* @dont_sink_alloca_to_catch.catch(i8*, i8*)
172 ; CHECK: %live_in_out_catch.i8 = call i8* @llvm.framerecover({{.*}}, i32 0)
173 ; CHECK: %live_in_out_catch = bitcast
177 attributes #0 = { uwtable "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "unsafe-fp-math"="false" "use-soft-float"="false" }
178 attributes #1 = { "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "unsafe-fp-math"="false" "use-soft-float"="false" }
179 attributes #2 = { nounwind readnone }
180 attributes #3 = { nounwind }