[llvm-commits] [llvm] r159837 - in /llvm/trunk: lib/CodeGen/SelectionDAG/FastISel.cpp test/CodeGen/X86/fast-isel.ll

[Chad Rosier]

Author: mcrosier
Date: Fri Jul  6 12:33:39 2012
New Revision: 159837

URL: http://llvm.org/viewvc/llvm-project?rev=159837&view=rev
Log:
[fast-isel] Tell fast-isel to do nothing with the new donothing intrinsic.

Modified:
    llvm/trunk/lib/CodeGen/SelectionDAG/FastISel.cpp
    llvm/trunk/test/CodeGen/X86/fast-isel.ll

Modified: llvm/trunk/lib/CodeGen/SelectionDAG/FastISel.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/SelectionDAG/FastISel.cpp?rev=159837&r1=159836&r2=159837&view=diff
==============================================================================
--- llvm/trunk/lib/CodeGen/SelectionDAG/FastISel.cpp (original)
+++ llvm/trunk/lib/CodeGen/SelectionDAG/FastISel.cpp Fri Jul  6 12:33:39 2012
@@ -573,7 +573,10 @@
     // At -O0 we don't care about the lifetime intrinsics.
   case Intrinsic::lifetime_start:
   case Intrinsic::lifetime_end:
+    // The donothing intrinsic does, well, nothing.
+  case Intrinsic::donothing:
     return true;
+
   case Intrinsic::dbg_declare: {
     const DbgDeclareInst *DI = cast<DbgDeclareInst>(Call);
     if (!DIVariable(DI->getVariable()).Verify() ||

Modified: llvm/trunk/test/CodeGen/X86/fast-isel.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/CodeGen/X86/fast-isel.ll?rev=159837&r1=159836&r2=159837&view=diff
==============================================================================
--- llvm/trunk/test/CodeGen/X86/fast-isel.ll (original)
+++ llvm/trunk/test/CodeGen/X86/fast-isel.ll Fri Jul  6 12:33:39 2012
@@ -117,3 +117,11 @@
   ret i64* %a3
 }
 
+declare void @llvm.donothing() readnone
+
+; CHECK: donada
+define void @donada() nounwind {
+entry:
+  call void @llvm.donothing()
+  ret void
+}