We currently only run ipsccp at LTO time, which is silly. It subsumes

ipconstprop and doesn't take much time.  Just run it in its place.

This adds a testcase for it, which I plan to expand to cover other
"integration" cases, where we expect the optimizer to be able to
eliminate various things.  Due to phase order issues we've regressed
in a number of areas and integration tests are the only way I see to
prevent this.

llvm-svn: 85729

1 files changed, 19 insertions, 0 deletions

diff --git a/llvm/test/FrontendC++/integration-O2.cpp b/llvm/test/FrontendC++/integration-O2.cpp
new file mode 100644
index 00000000000..bb65ac21033
--- /dev/null
+++ b/llvm/test/FrontendC++/integration-O2.cpp
@@ -0,0 +1,19 @@
+// RUN: %llvmgxx %s -O2 -S -o - | FileCheck %s
+
+// This test verifies that we get expected codegen out of the -O2 optimization
+// level from the full optimizer.
+
+
+
+// Verify that ipsccp is running and can eliminate globals.
+static int test1g = 42;
+void test1f1() {
+  if (test1g == 0) test1g = 0;
+}
+int test1f2() {
+  return test1g;
+}
+
+// CHECK: @_Z7test1f2v()
+// CHECK: entry:
+// CHECK-NEXT: ret i32 42