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Remove RegisterScavenger::isSuperRegUsed(). This completely reverses the mistaken commit r77904.

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Now there is no special treatment of instructions that redefine part of a
super-register. Instead, the super-register is marked with <imp-use,kill> and
<imp-def>. For instance, from LowerSubregs on ARM:

subreg: CONVERTING: %Q1<def> = INSERT_SUBREG %Q1<undef>, %D1<kill>, 5
subreg: %D2<def> = FCPYD %D1<kill>, 14, %reg0, %Q1<imp-def>

subreg: CONVERTING: %Q1<def> = INSERT_SUBREG %Q1, %D0<kill>, 6
subreg: %D3<def> = FCPYD %D0<kill>, 14, %reg0, %Q1<imp-use,kill>, %Q1<imp-def>

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@78466 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen
2009-08-08 13:19:10 +00:00
parent dffb051c21
commit 9390cd0e86
3 changed files with 9 additions and 41 deletions
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3
include/llvm/CodeGen/RegisterScavenging.h
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@@ -112,9 +112,6 @@ public:
bool isUsed(unsigned Reg) const { return !RegsAvailable[Reg]; }
bool isUnused(unsigned Reg) const { return RegsAvailable[Reg]; }
/// isSuperRegUsed - Test if a super register is currently being used.
bool isSuperRegUsed(unsigned Reg) const;
/// getRegsUsed - return all registers currently in use in used.
void getRegsUsed(BitVector &used, bool includeReserved);