We don't really care about correct register liveness information after the

post-ra scheduler has run. Disable the verifier checks that late in the game.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97837 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 59 insertions, 4 deletions

diff --git a/lib/CodeGen/LLVMTargetMachine.cpp b/lib/CodeGen/LLVMTargetMachine.cpp
index abf183c7dd..5e888650ba 100644
--- a/lib/CodeGen/LLVMTargetMachine.cpp
+++ b/lib/CodeGen/LLVMTargetMachine.cpp
@@ -212,6 +212,12 @@ bool LLVMTargetMachine::addPassesToEmitMachineCode(PassManagerBase &PM,
   return false; // success!
 }
 
+static void printNoVerify(PassManagerBase &PM,
+                           const char *Banner) {
+  if (PrintMachineCode)
+    PM.add(createMachineFunctionPrinterPass(dbgs(), Banner));
+}
+
 static void printAndVerify(PassManagerBase &PM,
                            const char *Banner,
                            bool allowDoubleDefs = false) {
@@ -378,13 +384,13 @@ bool LLVMTargetMachine::addCommonCodeGenPasses(PassManagerBase &PM,
   // Branch folding must be run after regalloc and prolog/epilog insertion.
   if (OptLevel != CodeGenOpt::None && !DisableBranchFold) {
     PM.add(createBranchFoldingPass(getEnableTailMergeDefault()));
-    printAndVerify(PM, "After BranchFolding");
+    printNoVerify(PM, "After BranchFolding");
   }
 
   // Tail duplication.
   if (OptLevel != CodeGenOpt::None && !DisableTailDuplicate) {
     PM.add(createTailDuplicatePass(false));
-    printAndVerify(PM, "After TailDuplicate");
+    printNoVerify(PM, "After TailDuplicate");
   }
 
   PM.add(createGCMachineCodeAnalysisPass());
@@ -394,11 +400,11 @@ bool LLVMTargetMachine::addCommonCodeGenPasses(PassManagerBase &PM,
 
   if (OptLevel != CodeGenOpt::None && !DisableCodePlace) {
     PM.add(createCodePlacementOptPass());
-    printAndVerify(PM, "After CodePlacementOpt");
+    printNoVerify(PM, "After CodePlacementOpt");
   }
 
   if (addPreEmitPass(PM, OptLevel))
-    printAndVerify(PM, "After PreEmit passes");
+    printNoVerify(PM, "After PreEmit passes");
 
   return false;
 }
diff --git a/test/CodeGen/X86/2010-03-05-EFLAGS-Redef.ll b/test/CodeGen/X86/2010-03-05-EFLAGS-Redef.ll
new file mode 100644
index 0000000000..3cca10e268
--- /dev/null
+++ b/test/CodeGen/X86/2010-03-05-EFLAGS-Redef.ll
@@ -0,0 +1,49 @@
+; RUN: llc < %s -verify-machineinstrs
+;
+; This test case is transformed into a single basic block by the machine
+; branch folding pass. That makes a complete mess of the %EFLAGS liveness, but
+; we don't care about liveness this late anyway.
+
+target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"
+target triple = "x86_64-apple-darwin10.2"
+
+define i32 @main(i32 %argc, i8** nocapture %argv) ssp {
+entry:
+  br i1 undef, label %bb, label %bb2
+
+bb:                                               ; preds = %entry
+  br label %bb2
+
+bb2:                                              ; preds = %bb, %entry
+  br i1 undef, label %bb3, label %bb5
+
+bb3:                                              ; preds = %bb2
+  br label %bb5
+
+bb5:                                              ; preds = %bb3, %bb2
+  br i1 undef, label %bb.nph239, label %bb8
+
+bb.nph239:                                        ; preds = %bb5
+  unreachable
+
+bb8:                                              ; preds = %bb5
+  br i1 undef, label %bb.nph237, label %bb47
+
+bb.nph237:                                        ; preds = %bb8
+  unreachable
+
+bb47:                                             ; preds = %bb8
+  br i1 undef, label %bb49, label %bb48
+
+bb48:                                             ; preds = %bb47
+  unreachable
+
+bb49:                                             ; preds = %bb47
+  br i1 undef, label %bb51, label %bb50
+
+bb50:                                             ; preds = %bb49
+  ret i32 0
+
+bb51:                                             ; preds = %bb49
+  ret i32 0
+}