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Use MCRegUnitIterator to compute regsOverlap().

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The register unit lists are typically much shorter than the register
overlap lists, and the backing table for register units has better cache
locality because it is smaller.

This makes llc about 0.5% faster. The regsOverlap() function isn't that hot.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@157651 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen 2012-05-29 23:40:02 +00:00
parent f52baf72c1
commit 96feada378
1 changed files with 9 additions and 3 deletions
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12
include/llvm/Target/TargetRegisterInfo.h
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@ -337,9 +337,15 @@ public:
if (regA == regB) return true;
if (isVirtualRegister(regA) || isVirtualRegister(regB))
return false;
for (const uint16_t *regList = getOverlaps(regA)+1; *regList; ++regList) {
if (*regList == regB) return true;
}
// Regunits are numerically ordered. Find a common unit.
MCRegUnitIterator RUA(regA, this);
MCRegUnitIterator RUB(regB, this);
do {
if (*RUA == *RUB) return true;
if (*RUA < *RUB) ++RUA;
else ++RUB;
} while (RUA.isValid() && RUB.isValid());
return false;
}