Fix pr3954. The register scavenger asserts for inline assembly with

register destinations that are tied to source operands.  The
TargetInstrDescr::findTiedToSrcOperand method silently fails for inline
assembly.  The existing MachineInstr::isRegReDefinedByTwoAddr was very
close to doing what is needed, so this revision makes a few changes to
that method and also renames it to isRegTiedToUseOperand (for consistency
with the very similar isRegTiedToDefOperand and because it handles both
two-address instructions and inline assembly with tied registers).

llvm-svn: 68714

1 files changed, 0 insertions, 13 deletions

diff --git a/llvm/lib/Target/TargetInstrInfo.cpp b/llvm/lib/Target/TargetInstrInfo.cpp
index 10a5cdb6247..1bdeef40097 100644
--- a/llvm/lib/Target/TargetInstrInfo.cpp
+++ b/llvm/lib/Target/TargetInstrInfo.cpp
@@ -16,19 +16,6 @@
 #include "llvm/DerivedTypes.h"
 using namespace llvm;
 
-/// findTiedToSrcOperand - Returns the operand that is tied to the specified
-/// dest operand. Returns -1 if there isn't one.
-int TargetInstrDesc::findTiedToSrcOperand(unsigned OpNum) const {
-  for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
-    if (i == OpNum)
-      continue;
-    if (getOperandConstraint(i, TOI::TIED_TO) == (int)OpNum)
-      return i;
-  }
-  return -1;
-}
-
-
 TargetInstrInfo::TargetInstrInfo(const TargetInstrDesc* Desc,
                                  unsigned numOpcodes)
   : Descriptors(Desc), NumOpcodes(numOpcodes) {