Added llvm-lto2 test

Author: romanova-ekaterina

llvm/test/ThinLTO/X86/dtlto/dtlto-cache.ll

@@ -0,0 +1,74 @@
+; Test DTLTO output with llvm-lto2.
+
+RUN: rm -rf %t && split-file %s %t && cd %t
+
+; Generate bitcode files with summary.
+RUN: opt -thinlto-bc t1.ll -o t1.bc
+RUN: opt -thinlto-bc t2.ll -o t2.bc
+
+; Generate fake object files for mock.py to return.
+RUN: touch t1.o t2.o
+
+; Create an empty subdirectory to avoid having to account for the input files.
+RUN: mkdir %t/out && cd %t/out
+
+; Define a substitution to share the common DTLTO arguments with caching enabled.
+DEFINE: %{command} = llvm-lto2 run ../t1.bc ../t2.bc -o t.o -cache-dir cache-dir \
+DEFINE:   -dtlto-distributor=%python \
+DEFINE:   -dtlto-distributor-arg=%llvm_src_root/utils/dtlto/mock.py,../t1.o,../t2.o \
+DEFINE:   -r=../t1.bc,t1,px \
+DEFINE:   -r=../t2.bc,t2,px
+
+; Perform out of process ThinLTO (DTLTO). 
+; Note: mock.py does not do any compilation, instead it simply writes
+; the contents of the object files supplied on the command line into the
+; output object files in job order.
+RUN: %{command}
+
+; Check that the expected output files have been created.
+RUN: ls | count 3
+; Check that two native object files has been created
+RUN: ls | FileCheck %s --check-prefix=THINLTO
+; Check that DTLTO cache directory has been created
+RUN: ls cache-dir/* | count 2
+; Check that 2 cache entries are created
+RUN: ls cache-dir/llvmcache-* | count 2
+
+; llvm-lto2 ThinLTO output files.
+THINLTO-DAG: {{^}}t.o.1{{$}}
+THINLTO-DAG: {{^}}t.o.2{{$}}
+
+# Execute llvm-lto2 again and check that a fully populated cache is used correctly, 
+# i.e., no additional cache entries are created for cache hits.
+
+RUN: %{command}
+
+; Check that the expected output files have been created.
+RUN: ls | count 3
+; Check that two native object files has been created
+RUN: ls | FileCheck %s --check-prefix=THINLTO
+; Check that DTLTO cache directory has been created
+RUN: ls cache-dir/* | count 2
+; Check that 2 cache entries are created
+RUN: ls cache-dir/llvmcache-* | count 2
+
+
+
+
+;--- t1.ll
+
+target triple = "x86_64-unknown-linux-gnu"
+target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
+
+define void @t1() {
+  ret void
+}
+
+;--- t2.ll
+
+target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-unknown-linux-gnu"
+
+define void @t2() {
+  ret void
+}