| ; RUN: opt %s -passes='default<O0>,globalopt' -S -o - |
| |
| ; This is a regression test against very slow execution... |
| ; In bad case it should fail by timeout. |
| |
| ; Hand-reduced from this example. |
| ; clang++ -mllvm -disable-llvm-optzns |
| |
| ;#include <stdio.h> |
| ; |
| ;namespace { |
| ; char LargeBuffer[64 * 1024 * 1024]; |
| ;} |
| ; |
| ;int main ( void ) { |
| ; |
| ; LargeBuffer[0] = 0; |
| ; |
| ; printf(""); |
| ; |
| ; return LargeBuffer[0] == 0; |
| ;} |
| |
| ; check that global array LargeBufferE was optimized out |
| ; and local variable LargeBufferE.0 was used instead. |
| |
| ; CHECK-NOT: global |
| ; CHECK: main() |
| ; CHECK-NEXT: LargeBufferE.0 |
| ; CHECK-NOT: global |
| |
| ; ModuleID = 'test.cpp' |
| source_filename = "test.cpp" |
| target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128" |
| target triple = "x86_64-unknown-linux-gnu" |
| |
| @LargeBufferE = internal global [67108864 x i8] zeroinitializer, align 16 |
| @.str = private unnamed_addr constant [1 x i8] c"\00", align 1 |
| |
| ; Function Attrs: norecurse uwtable |
| define dso_local i32 @main() #0 { |
| %1 = alloca i32, align 4 |
| store i32 0, ptr %1, align 4 |
| store i8 0, ptr @LargeBufferE, align 16 |
| %2 = call i32 (ptr, ...) @printf(ptr @.str) |
| %3 = load i8, ptr @LargeBufferE, align 16 |
| %4 = sext i8 %3 to i32 |
| %5 = icmp eq i32 %4, 0 |
| %6 = zext i1 %5 to i32 |
| ret i32 %6 |
| } |
| |
| declare dso_local i32 @printf(ptr, ...) #0 |
| |
| attributes #0 = { norecurse uwtable } |
| |
| !llvm.module.flags = !{!0} |
| !llvm.ident = !{!1} |
| |
| !0 = !{i32 1, !"wchar_size", i32 4} |
| !1 = !{!"clang version 10.0.0 "} |