[llvm-commits] [llvm] r85729 - in /llvm/trunk: include/llvm/Support/StandardPasses.h test/FrontendC++/integration-O2.cpp

[Chris Lattner]

Author: lattner
Date: Sun Nov  1 12:57:49 2009
New Revision: 85729

URL: http://llvm.org/viewvc/llvm-project?rev=85729&view=rev
Log:
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.


Added:
    llvm/trunk/test/FrontendC++/integration-O2.cpp
Modified:
    llvm/trunk/include/llvm/Support/StandardPasses.h

Modified: llvm/trunk/include/llvm/Support/StandardPasses.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/Support/StandardPasses.h?rev=85729&r1=85728&r2=85729&view=diff

==============================================================================
--- llvm/trunk/include/llvm/Support/StandardPasses.h (original)
+++ llvm/trunk/include/llvm/Support/StandardPasses.h Sun Nov  1 12:57:49 2009
@@ -100,8 +100,7 @@
     if (UnitAtATime) {
       PM->add(createGlobalOptimizerPass());     // Optimize out global vars
       PM->add(createGlobalDCEPass());           // Remove unused fns and globs
-      // IP Constant Propagation
-      PM->add(createIPConstantPropagationPass());
+      PM->add(createIPSCCPPass());              // IP SCCP
       PM->add(createDeadArgEliminationPass());  // Dead argument elimination
     }
     PM->add(createInstructionCombiningPass());  // Clean up after IPCP & DAE

Added: llvm/trunk/test/FrontendC++/integration-O2.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/FrontendC%2B%2B/integration-O2.cpp?rev=85729&view=auto

==============================================================================
--- llvm/trunk/test/FrontendC++/integration-O2.cpp (added)
+++ llvm/trunk/test/FrontendC++/integration-O2.cpp Sun Nov  1 12:57:49 2009
@@ -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