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Use a shared function for a common operation.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@156441 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen 2012-05-08 23:27:30 +00:00
parent a80f2d1f97
commit f191b43103
1 changed files with 5 additions and 26 deletions
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31
lib/Target/TargetRegisterInfo.cpp
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@ -143,17 +143,7 @@ TargetRegisterInfo::getCommonSubClass(const TargetRegisterClass *A,
// Register classes are ordered topologically, so the largest common
// sub-class it the common sub-class with the smallest ID.
const unsigned *SubA = A->getSubClassMask();
const unsigned *SubB = B->getSubClassMask();
// We could start the search from max(A.ID, B.ID), but we are only going to
// execute 2-3 iterations anyway.
for (unsigned Base = 0, BaseE = getNumRegClasses(); Base < BaseE; Base += 32)
if (unsigned Common = *SubA++ & *SubB++)
return getRegClass(Base + CountTrailingZeros_32(Common));
// No common sub-class exists.
return NULL;
return firstCommonClass(A->getSubClassMask(), B->getSubClassMask(), this);
}
const TargetRegisterClass *
@ -166,21 +156,10 @@ TargetRegisterInfo::getMatchingSuperRegClass(const TargetRegisterClass *A,
// Find Idx in the list of super-register indices.
const uint32_t *Mask = 0;
for (SuperRegClassIterator RCI(B, this); RCI.isValid(); ++RCI)
if (RCI.getSubReg() == Idx) {
Mask = RCI.getMask();
break;
}
if (!Mask)
return 0;
// The bit mask contains all register classes that are projected into B by
// Idx. Find a class that is also a sub-class of A.
const uint32_t *SC = A->getSubClassMask();
// Find the first common register class in TV and SC.
for (unsigned Base = 0, BaseE = getNumRegClasses(); Base < BaseE; Base += 32)
if (unsigned Common = *Mask++ & *SC++)
return getRegClass(Base + CountTrailingZeros_32(Common));
if (RCI.getSubReg() == Idx)
// The bit mask contains all register classes that are projected into B
// by Idx. Find a class that is also a sub-class of A.
return firstCommonClass(RCI.getMask(), A->getSubClassMask(), this);
return 0;
}