1; Check constant propagation in thinlto combined summary. This allows us to do 2 things: 2; 1. Internalize global definition which is not used externally if all accesses to it are read-only 3; 2. Make a local copy of internal definition if all accesses to it are readonly. This allows constant 4; folding it during optimziation phase. 5 6; -stats requires asserts 7; REQUIRES: asserts 8 9; RUN: opt -module-summary %s -o %t1.bc 10; RUN: opt -module-summary %p/Inputs/index-const-prop.ll -o %t2.bc 11; RUN: llvm-lto -thinlto-action=thinlink -o %t3.index.bc %t1.bc %t2.bc 12; 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 13; RUN: llvm-dis %t1.imported.bc -o - | FileCheck %s --check-prefix=IMPORT 14; RUN: llvm-lto -thinlto-action=optimize %t1.imported.bc -o - | llvm-dis - -o - | FileCheck %s --check-prefix=OPTIMIZE 15 16; STATS: 2 module-summary-index - Number of live global variables marked read only 17 18; Check that we don't internalize gBar when it is exported 19; RUN: llvm-lto -thinlto-action=import -exported-symbol main -exported-symbol gBar %t1.bc -thinlto-index=%t3.index.bc -o %t1.imported2.bc 20; RUN: llvm-dis %t1.imported2.bc -o - | FileCheck %s --check-prefix=IMPORT2 21 22; IMPORT: @gFoo.llvm.0 = internal unnamed_addr global i32 1, align 4, !dbg !0 23; IMPORT-NEXT: @gBar = internal local_unnamed_addr global i32 2, align 4, !dbg !5 24; IMPORT: !DICompileUnit({{.*}}) 25 26; OPTIMIZE: define i32 @main 27; OPTIMIZE-NEXT: ret i32 3 28 29; IMPORT2: @gBar = available_externally local_unnamed_addr global i32 2, align 4, !dbg !5 30 31target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128" 32target triple = "x86_64-pc-linux-gnu" 33 34@gBar = external global i32 35 36; Should not be counted in the stats of live read only variables since it is 37; dead and will be dropped anyway. 38@gDead = internal unnamed_addr global i32 1, align 4 39 40define i32 @main() local_unnamed_addr { 41 %call = tail call i32 bitcast (i32 (...)* @foo to i32 ()*)() 42 %call1 = tail call i32 bitcast (i32 (...)* @bar to i32 ()*)() 43 %add = add nsw i32 %call1, %call 44 ret i32 %add 45} 46 47declare i32 @foo(...) local_unnamed_addr 48 49declare i32 @bar(...) local_unnamed_addr 50