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Fix X86FastISel's address-mode folding to stay within the 

original basic block. This avoids trouble with examining
instructions in other basic blocks which haven't been
assigned registers yet.

llvm-svn: 106310
This commit is contained in:
Dan Gohman 2010-06-18 20:44:47 +00:00
parent a06c2f79fc
commit af4903d6ee
1 changed files with 6 additions and 0 deletions
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6
llvm/lib/Target/X86/X86FastISel.cpp
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@ -342,6 +342,12 @@ bool X86FastISel::X86SelectAddress(const Value *V, X86AddressMode &AM) {
const User *U = NULL;
unsigned Opcode = Instruction::UserOp1;
if (const Instruction *I = dyn_cast<Instruction>(V)) {
// Don't walk into other basic blocks; it's possible we haven't
// visited them yet, so the instructions may not yet be assigned
// virtual registers.
if (MBBMap[I->getParent()] != MBB)
return false;
Opcode = I->getOpcode();
U = I;
} else if (const ConstantExpr *C = dyn_cast<ConstantExpr>(V)) {