Revert "Re-enable "[MachineCopyPropagation] Extend pass to do COPY source forwarding""

This reverts commit r314729.

Another bug has been encountered in an out-of-tree target reported by Quentin.

llvm-svn: 314814

1 files changed, 0 insertions, 9 deletions

diff --git a/llvm/lib/CodeGen/TargetPassConfig.cpp b/llvm/lib/CodeGen/TargetPassConfig.cpp
index c0aa0fb45f6..4584f65619c 100644
--- a/llvm/lib/CodeGen/TargetPassConfig.cpp
+++ b/llvm/lib/CodeGen/TargetPassConfig.cpp
@@ -88,8 +88,6 @@ static cl::opt<bool> DisableCGP("disable-cgp", cl::Hidden,
     cl::desc("Disable Codegen Prepare"));
 static cl::opt<bool> DisableCopyProp("disable-copyprop", cl::Hidden,
     cl::desc("Disable Copy Propagation pass"));
-static cl::opt<bool> DisableCopyPropPreRegRewrite("disable-copyprop-prerewrite", cl::Hidden,
-    cl::desc("Disable Copy Propagation Pre-Register Re-write pass"));
 static cl::opt<bool> DisablePartialLibcallInlining("disable-partial-libcall-inlining",
     cl::Hidden, cl::desc("Disable Partial Libcall Inlining"));
 static cl::opt<bool> EnableImplicitNullChecks(
@@ -254,9 +252,6 @@ static IdentifyingPassPtr overridePass(AnalysisID StandardID,
   if (StandardID == &MachineCopyPropagationID)
     return applyDisable(TargetID, DisableCopyProp);
 
-  if (StandardID == &MachineCopyPropagationPreRegRewriteID)
-    return applyDisable(TargetID, DisableCopyPropPreRegRewrite);
-
   return TargetID;
 }
 
@@ -1069,10 +1064,6 @@ void TargetPassConfig::addOptimizedRegAlloc(FunctionPass *RegAllocPass) {
     // Allow targets to change the register assignments before rewriting.
     addPreRewrite();
 
-    // Copy propagate to forward register uses and try to eliminate COPYs that
-    // were not coalesced.
-    addPass(&MachineCopyPropagationPreRegRewriteID);
-
     // Finally rewrite virtual registers.
     addPass(&VirtRegRewriterID);