From eadd32cda20d72d542f3d2a4c01267fe646f0e79 Mon Sep 17 00:00:00 2001
From: Chris Lattner <sabre@nondot.org>
Date: Mon, 6 May 2002 16:52:15 +0000
Subject: [PATCH] Instruction Combination can create a ton of trivially dead
 instructions.  Remove them with an DIE pass before more expensive
 optimizations are run.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2491 91177308-0d34-0410-b5e6-96231b3b80d8
---
 tools/gccas/gccas.cpp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tools/gccas/gccas.cpp b/tools/gccas/gccas.cpp
index a292a71afed..5d14e3c4a00 100644
--- a/tools/gccas/gccas.cpp
+++ b/tools/gccas/gccas.cpp
@@ -83,6 +83,7 @@ int main(int argc, char **argv) {
     Passes.add(createRaisePointerReferencesPass()); // Eliminate casts
     Passes.add(createPromoteMemoryToRegister());    // Promote alloca's to regs
     Passes.add(createInstructionCombiningPass());   // Combine silly seq's
+    Passes.add(createDeadInstEliminationPass());    // Kill InstCombine remnants
     Passes.add(createSCCPPass());                   // Constant prop with SCCP
     Passes.add(createGCSEPass());                   // Remove common subexprs
     Passes.add(createDeadCodeEliminationPass());    // Remove Dead code/vars