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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 

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.

llvm-svn: 47499
This commit is contained in:
Evan Cheng 2008-02-22 20:30:53 +00:00
parent c77f34daad
commit 52c15b3e6d
1 changed files with 1 additions and 1 deletions
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llvm/lib/CodeGen/RegAllocLocal.cpp
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@ -368,7 +368,7 @@ bool RALocal::isPhysRegAvailable(unsigned PhysReg) const {
// not free!
for (const unsigned *AliasSet = TRI->getAliasSet(PhysReg);
*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 true;
}