static bool SpeculativelyExecuteBB(BranchInst *BI, BasicBlock *BB1) {
// Only speculatively execution a single instruction (not counting the
// terminator) for now.
- if (BB1->size() != 2)
- return false;
+ BasicBlock::iterator BBI = BB1->begin();
+ ++BBI; // must have at least a terminator
+ if (BBI == BB1->end()) return false; // only one inst
+ ++BBI;
+ if (BBI != BB1->end()) return false; // more than 2 insts.
// Be conservative for now. FP select instruction can often be expensive.
Value *BrCond = BI->getCondition();
case Instruction::Shl:
case Instruction::LShr:
case Instruction::AShr:
- if (I->getOperand(0)->getType()->isFPOrFPVector())
- return false; // FP arithmetic might trap.
+ if (!I->getOperand(0)->getType()->isInteger())
+ // FP arithmetic might trap. Not worth doing for vector ops.
+ return false;
break; // These are all cheap and non-trapping instructions.
}