| ; RUN: opt -mtriple=x86_64-pc-windows-msvc -winehprepare -S -o - < %s | FileCheck %s |
| |
| ; This test describes two difficult cases in sinking allocas into child frames. |
| ; We don't currently do this optimization, but we'll need to tweak these tests |
| ; when we do. |
| |
| ; This test is based on the following code: |
| ; |
| ; // In this case we can sink the alloca from the parent into the catch because |
| ; // the lifetime is limited to the catch. |
| ; extern "C" void may_throw(); |
| ; extern "C" void sink_alloca_to_catch() { |
| ; try { |
| ; may_throw(); |
| ; } catch (int) { |
| ; volatile int only_used_in_catch = 42; |
| ; } |
| ; } |
| ; |
| ; // In this case we cannot. The variable should live as long as the parent |
| ; // frame lives. |
| ; extern "C" void use_catch_var(int *); |
| ; extern "C" void dont_sink_alloca_to_catch(int n) { |
| ; int live_in_out_catch = 0; |
| ; while (n > 0) { |
| ; try { |
| ; may_throw(); |
| ; } catch (int) { |
| ; use_catch_var(&live_in_out_catch); |
| ; } |
| ; n--; |
| ; } |
| ; } |
| |
| target datalayout = "e-m:w-i64:64-f80:128-n8:16:32:64-S128" |
| target triple = "x86_64-pc-windows-msvc" |
| |
| declare void @may_throw() #1 |
| declare i32 @__CxxFrameHandler3(...) |
| declare i32 @llvm.eh.typeid.for(i8*) #2 |
| declare void @llvm.eh.begincatch(i8* nocapture, i8* nocapture) #3 |
| declare void @llvm.eh.endcatch() #3 |
| |
| %rtti.TypeDescriptor2 = type { i8**, i8*, [3 x i8] } |
| %eh.CatchHandlerType = type { i32, i8* } |
| |
| $"\01??_R0H@8" = comdat any |
| |
| @"\01??_7type_info@@6B@" = external constant i8* |
| @"\01??_R0H@8" = linkonce_odr global %rtti.TypeDescriptor2 { i8** @"\01??_7type_info@@6B@", i8* null, [3 x i8] c".H\00" }, comdat |
| @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" |
| |
| ; Function Attrs: uwtable |
| define void @sink_alloca_to_catch() #0 personality i8* bitcast (i32 (...)* @__CxxFrameHandler3 to i8*) { |
| entry: |
| %0 = alloca i32 |
| %only_used_in_catch = alloca i32, align 4 |
| invoke void @may_throw() |
| to label %try.cont unwind label %lpad |
| |
| lpad: ; preds = %entry |
| %1 = landingpad { i8*, i32 } |
| catch %eh.CatchHandlerType* @llvm.eh.handlertype.H.0 |
| %2 = extractvalue { i8*, i32 } %1, 1 |
| %3 = tail call i32 @llvm.eh.typeid.for(i8* bitcast (%eh.CatchHandlerType* @llvm.eh.handlertype.H.0 to i8*)) #3 |
| %matches = icmp eq i32 %2, %3 |
| br i1 %matches, label %catch, label %eh.resume |
| |
| catch: ; preds = %lpad |
| %4 = extractvalue { i8*, i32 } %1, 0 |
| call void @llvm.eh.begincatch(i8* %4, i8* null) #3 |
| store volatile i32 42, i32* %only_used_in_catch, align 4 |
| tail call void @llvm.eh.endcatch() #3 |
| br label %try.cont |
| |
| try.cont: ; preds = %entry, %catch |
| ret void |
| |
| eh.resume: ; preds = %lpad |
| resume { i8*, i32 } %1 |
| } |
| |
| ; CHECK-LABEL: define void @sink_alloca_to_catch() |
| ; CHECK: call void (...) @llvm.localescape(i32* %only_used_in_catch) |
| |
| declare void @use_catch_var(i32*) #1 |
| |
| ; Function Attrs: uwtable |
| define void @dont_sink_alloca_to_catch(i32 %n) #0 personality i8* bitcast (i32 (...)* @__CxxFrameHandler3 to i8*) { |
| entry: |
| %0 = alloca i32 |
| %n.addr = alloca i32, align 4 |
| %live_in_out_catch = alloca i32, align 4 |
| %exn.slot = alloca i8* |
| %ehselector.slot = alloca i32 |
| store i32 %n, i32* %n.addr, align 4 |
| br label %while.cond |
| |
| while.cond: ; preds = %try.cont, %entry |
| %1 = load i32, i32* %n.addr, align 4 |
| %cmp = icmp sgt i32 %1, 0 |
| br i1 %cmp, label %while.body, label %while.end |
| |
| while.body: ; preds = %while.cond |
| invoke void @may_throw() |
| to label %invoke.cont unwind label %lpad |
| |
| invoke.cont: ; preds = %while.body |
| br label %try.cont |
| |
| lpad: ; preds = %while.body |
| %2 = landingpad { i8*, i32 } |
| catch i8* bitcast (%eh.CatchHandlerType* @llvm.eh.handlertype.H.0 to i8*) |
| %3 = extractvalue { i8*, i32 } %2, 0 |
| store i8* %3, i8** %exn.slot |
| %4 = extractvalue { i8*, i32 } %2, 1 |
| store i32 %4, i32* %ehselector.slot |
| br label %catch.dispatch |
| |
| catch.dispatch: ; preds = %lpad |
| %sel = load i32, i32* %ehselector.slot |
| %5 = call i32 @llvm.eh.typeid.for(i8* bitcast (%eh.CatchHandlerType* @llvm.eh.handlertype.H.0 to i8*)) #3 |
| %matches = icmp eq i32 %sel, %5 |
| br i1 %matches, label %catch, label %eh.resume |
| |
| catch: ; preds = %catch.dispatch |
| %exn = load i8*, i8** %exn.slot |
| call void @llvm.eh.begincatch(i8* %exn, i8* null) #3 |
| invoke void @use_catch_var(i32* %live_in_out_catch) |
| to label %invoke.cont2 unwind label %lpad1 |
| |
| invoke.cont2: ; preds = %catch |
| call void @llvm.eh.endcatch() #3 |
| br label %try.cont |
| |
| try.cont: ; preds = %invoke.cont2, %invoke.cont |
| %6 = load i32, i32* %0 |
| %7 = load i32, i32* %n.addr, align 4 |
| %dec = add nsw i32 %7, -1 |
| store i32 %dec, i32* %n.addr, align 4 |
| br label %while.cond |
| |
| lpad1: ; preds = %catch |
| %8 = landingpad { i8*, i32 } |
| cleanup |
| %9 = extractvalue { i8*, i32 } %8, 0 |
| store i8* %9, i8** %exn.slot |
| %10 = extractvalue { i8*, i32 } %8, 1 |
| store i32 %10, i32* %ehselector.slot |
| call void @llvm.eh.endcatch() #3 |
| br label %eh.resume |
| |
| while.end: ; preds = %while.cond |
| ret void |
| |
| eh.resume: ; preds = %lpad1, %catch.dispatch |
| %exn3 = load i8*, i8** %exn.slot |
| %sel4 = load i32, i32* %ehselector.slot |
| %lpad.val = insertvalue { i8*, i32 } undef, i8* %exn3, 0 |
| %lpad.val5 = insertvalue { i8*, i32 } %lpad.val, i32 %sel4, 1 |
| resume { i8*, i32 } %lpad.val5 |
| } |
| |
| ; CHECK-LABEL: define void @dont_sink_alloca_to_catch(i32 %n) |
| ; CHECK: call void (...) @llvm.localescape(i32* %live_in_out_catch) |
| |
| ; CHECK-LABEL: define internal i8* @sink_alloca_to_catch.catch(i8*, i8*) |
| ; CHECK: %only_used_in_catch.i8 = call i8* @llvm.localrecover({{.*}}, i32 0) |
| ; CHECK: %only_used_in_catch = bitcast |
| |
| ; CHECK-LABEL: define internal i8* @dont_sink_alloca_to_catch.catch(i8*, i8*) |
| ; CHECK: %live_in_out_catch.i8 = call i8* @llvm.localrecover({{.*}}, i32 0) |
| ; CHECK: %live_in_out_catch = bitcast |
| |
| |
| |
| 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" } |
| 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" } |
| attributes #2 = { nounwind readnone } |
| attributes #3 = { nounwind } |
