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Fix pr3954. The register scavenger asserts for inline assembly with

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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).


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@68714 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bob Wilson
2009-04-09 17:16:43 +00:00
parent 37831d0a12
commit d9df501704
12 changed files with 47 additions and 42 deletions
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8
include/llvm/CodeGen/MachineInstr.h
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@@ -241,9 +241,11 @@ public:
/// none is found.
int findFirstPredOperandIdx() const;
/// isRegReDefinedByTwoAddr - Given the index of a register def operand,
/// check if the register def is a re-definition due to two addr elimination.
bool isRegReDefinedByTwoAddr(unsigned DefIdx) const;
/// isRegTiedToUseOperand - Given the index of a register def operand,
/// check if the register def is tied to a source operand, due to either
/// two-address elimination or inline assembly constraints. Returns the
/// first tied use operand index by reference is UseOpIdx is not null.
bool isRegTiedToUseOperand(unsigned DefOpIdx, unsigned *UseOpIdx = 0);
/// isRegTiedToDefOperand - Return true if the use operand of the specified
/// index is tied to an def operand. It also returns the def operand index by