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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
llvm/lib/CodeGen
TargetRegisterInfo.cpp

17
llvm/lib/CodeGen/TargetRegisterInfo.cpp
View File

@ -112,11 +112,18 @@ TargetRegisterInfo::getAllocatableClass(const TargetRegisterClass *RC) const {
if (!RC || RC->isAllocatable()) if (!RC || RC->isAllocatable())
return RC; return RC;
for (BitMaskClassIterator It(RC->getSubClassMask(), *this); It.isValid(); const unsigned *SubClass = RC->getSubClassMask();
++It) { for (unsigned Base = 0, BaseE = getNumRegClasses();
const TargetRegisterClass *SubRC = getRegClass(It.getID()); Base < BaseE; Base += 32) {
if (SubRC->isAllocatable()) unsigned Idx = Base;
return SubRC; 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; return nullptr;
} }