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Simplify CCState's use of register aliases.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121806 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen 2010-12-14 23:28:01 +00:00
parent 597faa8f1f
commit eb7464ebda
1 changed files with 3 additions and 5 deletions
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8
lib/CodeGen/CallingConvLower.cpp
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@ -51,11 +51,9 @@ void CCState::HandleByVal(unsigned ValNo, MVT ValVT,
/// MarkAllocated - Mark a register and all of its aliases as allocated. /// MarkAllocated - Mark a register and all of its aliases as allocated.
void CCState::MarkAllocated(unsigned Reg) { void CCState::MarkAllocated(unsigned Reg) {
UsedRegs[Reg/32] |= 1 << (Reg&31); for (const unsigned *Alias = TRI.getOverlaps(Reg);
unsigned Reg = *Alias; ++Alias)
if (const unsigned *RegAliases = TRI.getAliasSet(Reg)) UsedRegs[Reg/32] |= 1 << (Reg&31);
for (; (Reg = *RegAliases); ++RegAliases)
UsedRegs[Reg/32] |= 1 << (Reg&31);
} }
/// AnalyzeFormalArguments - Analyze an array of argument values, /// AnalyzeFormalArguments - Analyze an array of argument values,