bool visitICmpInst(ICmpInst& inst) { // errs() << "got icmp instruction! " << inst << '\n'; bool changed = false; if (inst.getPredicate() == CmpInst::ICMP_EQ) { assert(inst.getNumOperands() == 2); if (inst.getOperand(1) == processing) { inst.swapOperands(); changed = true; any_changes = true; } assert(dyn_cast<Instruction>(inst.getOperand(0)) == processing); Value* other = inst.getOperand(1); if (isa<ConstantPointerNull>(other)) { if (VERBOSITY("opt") >= 2) { errs() << inst << '\n'; errs() << "replacing with false!\n"; } Value* new_value = ConstantInt::getFalse(other->getContext()); inst.replaceAllUsesWith(new_value); inst.eraseFromParent(); changed = true; any_changes = true; } } return changed; }
bool AMDGPUCodeGenPrepare::promoteUniformOpToI32(ICmpInst &I) const { assert(needsPromotionToI32(I.getOperand(0)->getType()) && "I does not need promotion to i32"); IRBuilder<> Builder(&I); Builder.SetCurrentDebugLocation(I.getDebugLoc()); Type *I32Ty = getI32Ty(Builder, I.getOperand(0)->getType()); Value *ExtOp0 = nullptr; Value *ExtOp1 = nullptr; Value *NewICmp = nullptr; if (I.isSigned()) { ExtOp0 = Builder.CreateSExt(I.getOperand(0), I32Ty); ExtOp1 = Builder.CreateSExt(I.getOperand(1), I32Ty); } else { ExtOp0 = Builder.CreateZExt(I.getOperand(0), I32Ty); ExtOp1 = Builder.CreateZExt(I.getOperand(1), I32Ty); } NewICmp = Builder.CreateICmp(I.getPredicate(), ExtOp0, ExtOp1); I.replaceAllUsesWith(NewICmp); I.eraseFromParent(); return true; }
bool GambasPass::runOnFunction(Function &F){ IRBuilder<> Builder(F.getContext()); bool changed = false; for(Function::iterator BB = F.begin(), E = F.end(); BB != E; ++BB) { for(BasicBlock::iterator I = BB->begin(), E = BB->end(); I != E; ){ ICmpInst* ICI = dyn_cast<ICmpInst>(I); CallInst* CI = dyn_cast<CallInst>(I++); if (ICI && ICI->hasMetadata() && ICI->getMetadata("unref_slt") && dyn_cast<LoadInst>(ICI->getOperand(0))){ ICI->replaceAllUsesWith(ConstantInt::get(ICI->getType(), false)); ICI->eraseFromParent(); changed = true; continue; } if (!CI) continue; Function* callee = CI->getCalledFunction(); if (callee == NULL || !callee->isDeclaration()) continue; StringRef name = callee->getName(); if (name == "JR_release_variant" || name == "JR_borrow_variant"){ ConstantInt* vtype_int = dyn_cast<ConstantInt>(CI->getArgOperand(0)); if (!vtype_int) continue; uint64_t vtype = vtype_int->getZExtValue(); if (TYPE_is_string(vtype) || TYPE_is_object(vtype)) continue; CI->eraseFromParent(); changed = true; } else if (name == FUNCTION_NAME(__finite)){ ConstantFP* op = dyn_cast<ConstantFP>(CI->getArgOperand(0)); if (!op) continue; int val = __finite(op->getValueAPF().convertToDouble()); Constant* res = ConstantInt::get(CI->getType(), val); CI->replaceAllUsesWith(res); CI->eraseFromParent(); changed = true; } else if (name == FUNCTION_NAME(__isnan)){ ConstantFP* op = dyn_cast<ConstantFP>(CI->getArgOperand(0)); if (!op) continue; int val = __isnan(op->getValueAPF().convertToDouble()); Constant* res = ConstantInt::get(CI->getType(), val); CI->replaceAllUsesWith(res); CI->eraseFromParent(); changed = true; } else if (name == FUNCTION_NAME(__isinf)){ ConstantFP* op = dyn_cast<ConstantFP>(CI->getArgOperand(0)); if (!op) continue; int val = __isinf(op->getValueAPF().convertToDouble()); Constant* res = ConstantInt::get(CI->getType(), val); CI->replaceAllUsesWith(res); CI->eraseFromParent(); changed = true; } } } return changed; }