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1; Checks that we optimize writeonly variables and corresponding stores using llvm-lto2; -stats requires asserts3; REQUIRES: asserts4 5; RUN: opt -module-summary %s -o %t1.bc6; RUN: opt -module-summary %p/Inputs/index-const-prop.ll -o %t2.bc7; RUN: llvm-lto -thinlto-action=thinlink -o %t3.index.bc %t1.bc %t2.bc8 9; Check that we optimize write-only variables10; RUN: llvm-lto -thinlto-action=import -exported-symbol=main %t1.bc -thinlto-index=%t3.index.bc -o %t1.imported.bc -stats 2>&1 | FileCheck %s --check-prefix=STATS11; RUN: llvm-dis %t1.imported.bc -o - | FileCheck %s --check-prefix=IMPORT12; RUN: llvm-lto -thinlto-action=optimize %t1.imported.bc -o - | llvm-dis - -o - | FileCheck %s --check-prefix=OPTIMIZE13 14; IMPORT: @gBar = internal local_unnamed_addr global i32 0, align 4, !dbg !015; IMPORT-NEXT: @gFoo.llvm.0 = internal unnamed_addr global i32 0, align 4, !dbg !516; IMPORT: !DICompileUnit({{.*}})17 18; STATS: 2 module-summary-index - Number of live global variables marked write only 19 20; Check that we've optimized out variables and corresponding stores21; OPTIMIZE-NOT: gFoo22; OPTIMIZE-NOT: gBar23; OPTIMIZE: i32 @main24; OPTIMIZE-NEXT: %1 = tail call i32 @rand()25; OPTIMIZE-NEXT: %2 = tail call i32 @rand()26; OPTIMIZE-NEXT: ret i32 027 28; Confirm that with -propagate-attrs=false we no longer do write-only importing29; RUN: llvm-lto -propagate-attrs=false -thinlto-action=import -exported-symbol=main %t1.bc -thinlto-index=%t3.index.bc -o %t1.imported.bc -stats 2>&1 | FileCheck %s --check-prefix=STATS-NOPROP30; RUN: llvm-dis %t1.imported.bc -o - | FileCheck %s --check-prefix=IMPORT-NOPROP31; STATS-NOPROP-NOT: Number of live global variables marked write only32; IMPORT-NOPROP: @gBar = available_externally33; IMPORT-NOPROP-NEXT: @gFoo.llvm.0 = available_externally34 35target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"36target triple = "x86_64-pc-linux-gnu"37 38@gBar = external global i3239 40; Should not be counted in the stats of live write only variables since it is41; dead and will be dropped anyway.42@gDead = internal unnamed_addr global i32 1, align 443 44define i32 @main() local_unnamed_addr {45 tail call void @baz()46 ret i32 047}48declare void @baz() local_unnamed_addr49