Add to the split module utility an SCC based method which allows not to globalize any local variables.
Summary:
Currently llvm::SplitModule as the first step globalizes all local objects, which might not be desirable in some scenarios.
This change adds a new flag to llvm::SplitModule that uses SCC approach to search for a balanced partition without the need to externalize symbols.
Such partition might not be possible or fully balanced for a given number of partitions, and is a function of the module properties (global/local dependencies within the module).
Joint development Tobias Edler von Koch (tobias@codeaurora.org) and Sergei Larin (slarin@codeaurora.org)
Subscribers: llvm-commits, joker.eph
Differential Revision: http://reviews.llvm.org/D16124
llvm-svn: 258083
diff --git a/llvm/test/tools/llvm-split/scc-alias.ll b/llvm/test/tools/llvm-split/scc-alias.ll
new file mode 100644
index 0000000..f8400bd
--- /dev/null
+++ b/llvm/test/tools/llvm-split/scc-alias.ll
@@ -0,0 +1,48 @@
+; All of the functions in this module must end up
+; in the same partition without change of scope.
+; RUN: llvm-split -j=2 -preserve-locals -o %t %s
+; RUN: llvm-dis -o - %t0 | FileCheck --check-prefix=CHECK1 %s
+; RUN: llvm-dis -o - %t1 | FileCheck --check-prefix=CHECK0 %s
+
+; CHECK0: declare i32 @funInternal
+; CHECK0: declare i32 @funExternal
+; CHECK0: declare i32 @funInternal2
+; CHECK0: declare i32 @funExternal2
+
+; All functions are in the same file.
+; Local functions are still local.
+; CHECK1: define internal i32 @funInternal
+; CHECK1: define i32 @funExternal
+; CHECK1: define internal i32 @funInternal2
+; CHECK1: define i32 @funExternal2
+
+
+@funInternalAlias = internal alias i32 (), i32 ()* @funInternal
+
+define internal i32 @funInternal() {
+entry:
+ ret i32 0
+}
+
+; Direct call to local alias
+
+define i32 @funExternal() {
+entry:
+ %x = call i32 @funInternalAlias()
+ ret i32 %x
+}
+
+; Call to local function that calls local alias
+
+define internal i32 @funInternal2() {
+entry:
+ %x = call i32 @funInternalAlias()
+ ret i32 %x
+}
+
+define i32 @funExternal2() {
+entry:
+ %x = call i32 @funInternal2()
+ ret i32 %x
+}
+