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Revert "[TargetRegisterInfo] Refactor the code to use BitMaskClassIterator." 

This reverts commit r265734.
Looks like ASan is not happy about it.
http://lab.llvm.org:8011/builders/sanitizer-x86_64-linux-fast/builds/11741

Looking.

llvm-svn: 265755
This commit is contained in:
Quentin Colombet 2016-04-08 00:03:51 +00:00
parent dcf5cf6a29
commit e0a7ffa6cb
1 changed files with 12 additions and 5 deletions
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17
llvm/lib/CodeGen/TargetRegisterInfo.cpp
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@ -112,11 +112,18 @@ TargetRegisterInfo::getAllocatableClass(const TargetRegisterClass *RC) const {
if (!RC || RC->isAllocatable())
return RC;
for (BitMaskClassIterator It(RC->getSubClassMask(), *this); It.isValid();
++It) {
const TargetRegisterClass *SubRC = getRegClass(It.getID());
if (SubRC->isAllocatable())
return SubRC;
const unsigned *SubClass = RC->getSubClassMask();
for (unsigned Base = 0, BaseE = getNumRegClasses();
Base < BaseE; Base += 32) {
unsigned Idx = Base;
for (unsigned Mask = *SubClass++; Mask; Mask >>= 1) {
unsigned Offset = countTrailingZeros(Mask);
const TargetRegisterClass *SubRC = getRegClass(Idx + Offset);
if (SubRC->isAllocatable())
return SubRC;
Mask >>= Offset;
Idx += Offset + 1;
}
}
return nullptr;
}