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1; RUN: opt %s -passes='default<O0>,globalopt' -S -o -2 3; This is a regression test against very slow execution...4; In bad case it should fail by timeout.5 6; Hand-reduced from this example.7; clang++ -mllvm -disable-llvm-optzns8 9;#include <stdio.h>10;11;namespace {12; char LargeBuffer[64 * 1024 * 1024];13;}14;15;int main ( void ) {16;17; LargeBuffer[0] = 0;18;19; printf("");20;21; return LargeBuffer[0] == 0;22;}23 24; check that global array LargeBufferE was optimized out25; and local variable LargeBufferE.0 was used instead.26 27; CHECK-NOT: global28; CHECK: main()29; CHECK-NEXT: LargeBufferE.030; CHECK-NOT: global31 32; ModuleID = 'test.cpp'33source_filename = "test.cpp"34target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"35target triple = "x86_64-unknown-linux-gnu"36 37@LargeBufferE = internal global [67108864 x i8] zeroinitializer, align 1638@.str = private unnamed_addr constant [1 x i8] c"\00", align 139 40; Function Attrs: norecurse uwtable41define dso_local i32 @main() #0 {42 %1 = alloca i32, align 443 store i32 0, ptr %1, align 444 store i8 0, ptr @LargeBufferE, align 1645 %2 = call i32 (ptr, ...) @printf(ptr @.str)46 %3 = load i8, ptr @LargeBufferE, align 1647 %4 = sext i8 %3 to i3248 %5 = icmp eq i32 %4, 049 %6 = zext i1 %5 to i3250 ret i32 %651}52 53declare dso_local i32 @printf(ptr, ...) #054 55attributes #0 = { norecurse uwtable }56 57!llvm.module.flags = !{!0}58!llvm.ident = !{!1}59 60!0 = !{i32 1, !"wchar_size", i32 4}61!1 = !{!"clang version 10.0.0 "}62