[MachineOutliner] Check for explicit uses of LR/W30 in MI operands

Before, the outliner would grab ADRPs that used LR/W30. This patch fixes
that by checking for explicit uses of those registers before the special-casing
for ADRPs.

This also adds a test that ensures that those sorts of ADRPs won't be outlined.

llvm-svn: 330783

1 files changed, 5 insertions, 0 deletions

diff --git a/llvm/lib/Target/AArch64/AArch64InstrInfo.cpp b/llvm/lib/Target/AArch64/AArch64InstrInfo.cpp
index 5732dbe7b01..6de4bb2143d 100644
--- a/llvm/lib/Target/AArch64/AArch64InstrInfo.cpp
+++ b/llvm/lib/Target/AArch64/AArch64InstrInfo.cpp
@@ -5061,6 +5061,11 @@ AArch64InstrInfo::getOutliningType(MachineBasicBlock::iterator &MIT,
     if (MOP.isCPI() || MOP.isJTI() || MOP.isCFIIndex() || MOP.isFI() ||
         MOP.isTargetIndex())
       return MachineOutlinerInstrType::Illegal;
+
+    // If it uses LR or W30 explicitly, then don't touch it.
+    if (MOP.isReg() && !MOP.isImplicit() &&
+        (MOP.getReg() == AArch64::LR || MOP.getReg() == AArch64::W30))
+      return MachineOutlinerInstrType::Illegal;
   }
 
   // Special cases for instructions that can always be outlined, but will fail