[llvm-commits] [llvm] r85360 - in /llvm/trunk: lib/CodeGen/SelectionDAG/InstrEmitter.cpp test/CodeGen/X86/sink-hoist.ll

[Dan Gohman]

Author: djg
Date: Tue Oct 27 20:13:53 2009
New Revision: 85360

URL: http://llvm.org/viewvc/llvm-project?rev=85360&view=rev
Log:
Mark dead physregdefs dead immediately. This helps MachineSink and
MachineLICM and other things which run before LiveVariables is run.

Modified:
    llvm/trunk/lib/CodeGen/SelectionDAG/InstrEmitter.cpp
    llvm/trunk/test/CodeGen/X86/sink-hoist.ll

Modified: llvm/trunk/lib/CodeGen/SelectionDAG/InstrEmitter.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/SelectionDAG/InstrEmitter.cpp?rev=85360&r1=85359&r2=85360&view=diff

==============================================================================
--- llvm/trunk/lib/CodeGen/SelectionDAG/InstrEmitter.cpp (original)
+++ llvm/trunk/lib/CodeGen/SelectionDAG/InstrEmitter.cpp Tue Oct 27 20:13:53 2009
@@ -571,6 +571,8 @@
         unsigned Reg = II.getImplicitDefs()[i - II.getNumDefs()];
         if (Node->hasAnyUseOfValue(i))
           EmitCopyFromReg(Node, i, IsClone, IsCloned, Reg, VRBaseMap);
+        else
+          MI->addRegisterDead(Reg, TRI);
       }
     }
     return;

Modified: llvm/trunk/test/CodeGen/X86/sink-hoist.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/CodeGen/X86/sink-hoist.ll?rev=85360&r1=85359&r2=85360&view=diff

==============================================================================
--- llvm/trunk/test/CodeGen/X86/sink-hoist.ll (original)
+++ llvm/trunk/test/CodeGen/X86/sink-hoist.ll Tue Oct 27 20:13:53 2009
@@ -41,3 +41,18 @@
 return:
   ret void
 }
+
+; Sink instructions with dead EFLAGS defs.
+
+; CHECK:      je
+; CHECK-NEXT: orb
+
+define zeroext i8 @zzz(i8 zeroext %a, i8 zeroext %b) nounwind readnone {
+entry:
+  %tmp = zext i8 %a to i32                        ; <i32> [#uses=1]
+  %tmp2 = icmp eq i8 %a, 0                    ; <i1> [#uses=1]
+  %tmp3 = or i8 %b, -128                          ; <i8> [#uses=1]
+  %tmp4 = and i8 %b, 127                          ; <i8> [#uses=1]
+  %b_addr.0 = select i1 %tmp2, i8 %tmp4, i8 %tmp3 ; <i8> [#uses=1]
+  ret i8 %b_addr.0
+}