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Simplify RegScavenger::FindUnusedReg.

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- Drop the Candidates argument and fix all callers. Now that RegScavenger
  tracks available registers accurately, there is no need to restict the
  search.
- Make sure that no aliases of the found register are in use. This was a potential bug.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@79369 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen
2009-08-18 21:14:54 +00:00
parent 1123135dbf
commit c0823fe7c6
6 changed files with 13 additions and 51 deletions
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10
include/llvm/CodeGen/RegisterScavenging.h
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@@ -98,15 +98,9 @@ public:
/// getRegsUsed - return all registers currently in use in used.
void getRegsUsed(BitVector &used, bool includeReserved);
/// FindUnusedReg - Find a unused register of the specified register class
/// from the specified set of registers. It return 0 is none is found.
unsigned FindUnusedReg(const TargetRegisterClass *RegClass,
const BitVector &Candidates) const;
/// FindUnusedReg - Find a unused register of the specified register class.
/// Exclude callee saved registers if directed. It return 0 is none is found.
unsigned FindUnusedReg(const TargetRegisterClass *RegClass,
bool ExCalleeSaved = false) const;
/// Return 0 if none is found.
unsigned FindUnusedReg(const TargetRegisterClass *RegClass) const;
/// setScavengingFrameIndex / getScavengingFrameIndex - accessor and setter of
/// ScavengingFrameIndex.