diff options
Diffstat (limited to 'llvm/test/ThinLTO/X86/index-const-prop.ll')
| -rw-r--r-- | llvm/test/ThinLTO/X86/index-const-prop.ll | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/llvm/test/ThinLTO/X86/index-const-prop.ll b/llvm/test/ThinLTO/X86/index-const-prop.ll new file mode 100644 index 00000000000..df99d83fbb5 --- /dev/null +++ b/llvm/test/ThinLTO/X86/index-const-prop.ll @@ -0,0 +1,40 @@ +; Check constant propagation in thinlto combined summary. This allows us to do 2 things: +; 1. Internalize global definition which is not used externally if all accesses to it are read-only +; 2. Make a local copy of internal definition if all accesses to it are readonly. This allows constant +; folding it during optimziation phase. + +; RUN: opt -module-summary %s -o %t1.bc +; RUN: opt -module-summary %p/Inputs/index-const-prop.ll -o %t2.bc +; RUN: llvm-lto -thinlto-action=thinlink -o %t3.index.bc %t1.bc %t2.bc +; RUN: llvm-lto -thinlto-action=import -exported-symbol=main %t1.bc -thinlto-index=%t3.index.bc -o %t1.imported.bc +; RUN: llvm-dis %t1.imported.bc -o - | FileCheck %s --check-prefix=IMPORT +; RUN: llvm-lto -thinlto-action=optimize %t1.imported.bc -o - | llvm-dis - -o - | FileCheck %s --check-prefix=OPTIMIZE + +; Check that we don't internalize gBar when it is exported +; RUN: llvm-lto -thinlto-action=import -exported-symbol main -exported-symbol gBar %t1.bc -thinlto-index=%t3.index.bc -o %t1.imported2.bc +; RUN: llvm-dis %t1.imported2.bc -o - | FileCheck %s --check-prefix=IMPORT2 + +; IMPORT: @gFoo.llvm.0 = internal unnamed_addr global i32 1, align 4, !dbg !0 +; IMPORT-NEXT: @gBar = internal local_unnamed_addr global i32 2, align 4, !dbg !5 +; IMPORT: !DICompileUnit({{.*}}, globals: !{{[0-9]+}}) + +; OPTIMIZE: define i32 @main +; OPTIMIZE-NEXT: ret i32 3 + +; IMPORT2: @gBar = available_externally local_unnamed_addr global i32 2, align 4, !dbg !5 + +target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128" +target triple = "x86_64-pc-linux-gnu" + +@gBar = external global i32 + +define i32 @main() local_unnamed_addr { + %call = tail call i32 bitcast (i32 (...)* @foo to i32 ()*)() + %call1 = tail call i32 bitcast (i32 (...)* @bar to i32 ()*)() + %add = add nsw i32 %call1, %call + ret i32 %add +} + +declare i32 @foo(...) local_unnamed_addr + +declare i32 @bar(...) local_unnamed_addr |
