Add a command line option to skip the delay slot filler pass entirely for Mips.

The purpose of this option is to silence error messages issued by machine
verifier passes and enable them to run to the end. If this option is not
provided, -verify-machineinstrs complains when it discovers there is a
non-terminator instruction (an instruction that is in a delay slot) after the
first terminator in a basic block.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@156790 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Target/Mips/MipsDelaySlotFiller.cpp b/lib/Target/Mips/MipsDelaySlotFiller.cpp
index debf2f1b85c1be6fa4c5efda926b9624b54c506a..382e90bf389b7c019cbca0152ecf62cc4a6ea587 100644 (file)
--- a/lib/Target/Mips/MipsDelaySlotFiller.cpp
+++ b/lib/Target/Mips/MipsDelaySlotFiller.cpp
@@ -36,6 +36,13 @@ static cl::opt<bool> EnableDelaySlotFiller(
   cl::desc("Fill the Mips delay slots useful instructions."),
   cl::Hidden);
 
+// This option can be used to silence complaints by machine verifier passes.
+static cl::opt<bool> SkipDelaySlotFiller(
+  "skip-mips-delay-filler",
+  cl::init(false),
+  cl::desc("Skip MIPS' delay slot filling pass."),
+  cl::Hidden);
+
 namespace {
   struct Filler : public MachineFunctionPass {
 
@@ -53,6 +60,9 @@ namespace {
 
     bool runOnMachineBasicBlock(MachineBasicBlock &MBB);
     bool runOnMachineFunction(MachineFunction &F) {
+      if (SkipDelaySlotFiller)
+        return false;
+
       bool Changed = false;
       for (MachineFunction::iterator FI = F.begin(), FE = F.end();
            FI != FE; ++FI)