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Really really bad local register allocator bug. On X86, it was never using ESI, EDI, and EBP because of a bug in RALocal::isPhysRegAvailable(). For example, when

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it checks if ESI is available, it then looks at registers aliases to ESI. SIL is marked -2 (not allocatable) but isPhysRegAvailable() incorrectly assumes it is in use and returns false for ESI.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47499 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng
2008-02-22 20:30:53 +00:00
parent 9af7090392
commit bcfa1ca976
1 changed files with 1 additions and 1 deletions
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2
lib/CodeGen/RegAllocLocal.cpp
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@ -368,7 +368,7 @@ bool RALocal::isPhysRegAvailable(unsigned PhysReg) const {
// not free! // not free!
for (const unsigned *AliasSet = TRI->getAliasSet(PhysReg); for (const unsigned *AliasSet = TRI->getAliasSet(PhysReg);
*AliasSet; ++AliasSet) *AliasSet; ++AliasSet)
if (PhysRegsUsed[*AliasSet] != -1) // Aliased register in use? if (PhysRegsUsed[*AliasSet] >= 0) // Aliased register in use?
return false; // Can't use this reg then. return false; // Can't use this reg then.
return true; return true;
} }