[llvm] r259482 - WebAssembly: add option to disable register coloring

[JF Bastien via llvm-commits]

Author: jfb
Date: Tue Feb  2 03:30:01 2016
New Revision: 259482

URL: http://llvm.org/viewvc/llvm-project?rev=259482&view=rev
Log:
WebAssembly: add option to disable register coloring

Having this hidden option makes it easier to debug other issues.

Modified:
    llvm/trunk/lib/Target/WebAssembly/WebAssemblyRegColoring.cpp

Modified: llvm/trunk/lib/Target/WebAssembly/WebAssemblyRegColoring.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/WebAssembly/WebAssemblyRegColoring.cpp?rev=259482&r1=259481&r2=259482&view=diff
==============================================================================
--- llvm/trunk/lib/Target/WebAssembly/WebAssemblyRegColoring.cpp (original)
+++ llvm/trunk/lib/Target/WebAssembly/WebAssemblyRegColoring.cpp Tue Feb  2 03:30:01 2016
@@ -29,6 +29,10 @@ using namespace llvm;
 
 #define DEBUG_TYPE "wasm-reg-coloring"
 
+static cl::opt<bool>
+    DisableRegColoring("disable-wasm-reg-coloring", cl::Hidden, cl::init(false),
+                       cl::desc("Disable WebAssembly register coloring"));
+
 namespace {
 class WebAssemblyRegColoring final : public MachineFunctionPass {
 public:
@@ -76,6 +80,9 @@ bool WebAssemblyRegColoring::runOnMachin
            << "********** Function: " << MF.getName() << '\n';
   });
 
+  if (DisableRegColoring)
+    return false;
+
   // If there are calls to setjmp or sigsetjmp, don't perform coloring. Virtual
   // registers could be modified before the longjmp is executed, resulting in
   // the wrong value being used afterwards. (See <rdar://problem/8007500>.)