1; Checks that we optimize writeonly variables and corresponding stores using llvm-lto
2; -stats requires asserts
3; REQUIRES: asserts
4
5; RUN: opt -module-summary %s -o %t1.bc
6; RUN: opt -module-summary %p/Inputs/index-const-prop.ll -o %t2.bc
7; RUN: llvm-lto -thinlto-action=thinlink -o %t3.index.bc %t1.bc %t2.bc
8
9; Check that we optimize write-only variables
10; 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=STATS
11; RUN: llvm-dis %t1.imported.bc -o - | FileCheck %s --check-prefix=IMPORT
12; RUN: llvm-lto -thinlto-action=optimize %t1.imported.bc -o - | llvm-dis - -o - | FileCheck %s --check-prefix=OPTIMIZE
13
14; IMPORT: @gFoo.llvm.0 = internal unnamed_addr global i32 0, align 4, !dbg !0
15; IMPORT-NEXT: @gBar = internal local_unnamed_addr global i32 0, align 4, !dbg !5
16; 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 stores
21; OPTIMIZE-NOT:  gFoo
22; OPTIMIZE-NOT:  gBar
23; OPTIMIZE:      i32 @main
24; OPTIMIZE-NEXT:   %1 = tail call i32 @rand()
25; OPTIMIZE-NEXT:   %2 = tail call i32 @rand()
26; OPTIMIZE-NEXT:   ret i32 0
27
28; Confirm that with -propagate-attrs=false we no longer do write-only importing
29; 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-NOPROP
30; RUN: llvm-dis %t1.imported.bc -o - | FileCheck %s --check-prefix=IMPORT-NOPROP
31; STATS-NOPROP-NOT: Number of live global variables marked write only
32; IMPORT-NOPROP: @gFoo.llvm.0 = available_externally
33; IMPORT-NOPROP-NEXT: @gBar = available_externally
34
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 i32
39
40; Should not be counted in the stats of live write only variables since it is
41; dead and will be dropped anyway.
42@gDead = internal unnamed_addr global i32 1, align 4
43
44define i32 @main() local_unnamed_addr {
45  tail call void @baz()
46  ret i32 0
47}
48declare void @baz() local_unnamed_addr
49