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substantially reduce indentation and simplify DAGCombiner::SimplifySelectOps.
no functionality change (step #1) git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@114436 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
parent
f41b75d85b
commit
1806161a0b
@ -6582,100 +6582,91 @@ bool DAGCombiner::SimplifySelectOps(SDNode *TheSelect, SDValue LHS,
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// If this is a select from two identical things, try to pull the operation
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// through the select.
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if (LHS.getOpcode() == RHS.getOpcode() && LHS.hasOneUse() && RHS.hasOneUse()){
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// If this is a load and the token chain is identical, replace the select
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// of two loads with a load through a select of the address to load from.
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// This triggers in things like "select bool X, 10.0, 123.0" after the FP
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// constants have been dropped into the constant pool.
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if (LHS.getOpcode() == ISD::LOAD &&
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if (LHS.getOpcode() != RHS.getOpcode() ||
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!LHS.hasOneUse() || !RHS.hasOneUse())
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return false;
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// If this is a load and the token chain is identical, replace the select
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// of two loads with a load through a select of the address to load from.
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// This triggers in things like "select bool X, 10.0, 123.0" after the FP
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// constants have been dropped into the constant pool.
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if (LHS.getOpcode() == ISD::LOAD) {
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LoadSDNode *LLD = cast<LoadSDNode>(LHS);
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LoadSDNode *RLD = cast<LoadSDNode>(RHS);
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// Token chains must be identical.
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if (LHS.getOperand(0) != RHS.getOperand(0) ||
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// Do not let this transformation reduce the number of volatile loads.
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!cast<LoadSDNode>(LHS)->isVolatile() &&
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!cast<LoadSDNode>(RHS)->isVolatile() &&
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// Token chains must be identical.
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LHS.getOperand(0) == RHS.getOperand(0)) {
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LoadSDNode *LLD = cast<LoadSDNode>(LHS);
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LoadSDNode *RLD = cast<LoadSDNode>(RHS);
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// If this is an EXTLOAD, the VT's must match.
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if (LLD->getMemoryVT() == RLD->getMemoryVT()) {
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LLD->isVolatile() || RLD->isVolatile() ||
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// If this is an EXTLOAD, the VT's must match.
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LLD->getMemoryVT() != RLD->getMemoryVT() ||
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// FIXME: this discards src value information. This is
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// over-conservative. It would be beneficial to be able to remember
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// both potential memory locations. Since we are discarding
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// src value info, don't do the transformation if the memory
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// locations are not in the default address space.
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unsigned LLDAddrSpace = 0, RLDAddrSpace = 0;
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if (const Value *LLDVal = LLD->getMemOperand()->getValue()) {
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if (const PointerType *PT = dyn_cast<PointerType>(LLDVal->getType()))
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LLDAddrSpace = PT->getAddressSpace();
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}
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if (const Value *RLDVal = RLD->getMemOperand()->getValue()) {
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if (const PointerType *PT = dyn_cast<PointerType>(RLDVal->getType()))
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RLDAddrSpace = PT->getAddressSpace();
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}
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SDValue Addr;
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if (LLDAddrSpace == 0 && RLDAddrSpace == 0) {
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if (TheSelect->getOpcode() == ISD::SELECT) {
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// Check that the condition doesn't reach either load. If so, folding
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// this will induce a cycle into the DAG.
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if ((!LLD->hasAnyUseOfValue(1) ||
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!LLD->isPredecessorOf(TheSelect->getOperand(0).getNode())) &&
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(!RLD->hasAnyUseOfValue(1) ||
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!RLD->isPredecessorOf(TheSelect->getOperand(0).getNode()))) {
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Addr = DAG.getNode(ISD::SELECT, TheSelect->getDebugLoc(),
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LLD->getBasePtr().getValueType(),
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TheSelect->getOperand(0), LLD->getBasePtr(),
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RLD->getBasePtr());
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}
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} else {
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// Check that the condition doesn't reach either load. If so, folding
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// this will induce a cycle into the DAG.
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if ((!LLD->hasAnyUseOfValue(1) ||
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(!LLD->isPredecessorOf(TheSelect->getOperand(0).getNode()) &&
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!LLD->isPredecessorOf(TheSelect->getOperand(1).getNode()))) &&
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(!RLD->hasAnyUseOfValue(1) ||
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(!RLD->isPredecessorOf(TheSelect->getOperand(0).getNode()) &&
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!RLD->isPredecessorOf(TheSelect->getOperand(1).getNode())))) {
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Addr = DAG.getNode(ISD::SELECT_CC, TheSelect->getDebugLoc(),
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LLD->getBasePtr().getValueType(),
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TheSelect->getOperand(0),
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TheSelect->getOperand(1),
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LLD->getBasePtr(), RLD->getBasePtr(),
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TheSelect->getOperand(4));
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}
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}
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}
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if (Addr.getNode()) {
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SDValue Load;
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if (LLD->getExtensionType() == ISD::NON_EXTLOAD) {
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Load = DAG.getLoad(TheSelect->getValueType(0),
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TheSelect->getDebugLoc(),
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LLD->getChain(),
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Addr, 0, 0,
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LLD->isVolatile(),
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LLD->isNonTemporal(),
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LLD->getAlignment());
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} else {
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Load = DAG.getExtLoad(LLD->getExtensionType(),
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TheSelect->getValueType(0),
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TheSelect->getDebugLoc(),
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LLD->getChain(), Addr, 0, 0,
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LLD->getMemoryVT(),
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LLD->isVolatile(),
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LLD->isNonTemporal(),
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LLD->getAlignment());
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}
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// Users of the select now use the result of the load.
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CombineTo(TheSelect, Load);
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// Users of the old loads now use the new load's chain. We know the
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// old-load value is dead now.
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CombineTo(LHS.getNode(), Load.getValue(0), Load.getValue(1));
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CombineTo(RHS.getNode(), Load.getValue(0), Load.getValue(1));
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return true;
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}
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LLD->getPointerInfo().getAddrSpace() != 0 ||
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RLD->getPointerInfo().getAddrSpace() != 0)
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return false;
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SDValue Addr;
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if (TheSelect->getOpcode() == ISD::SELECT) {
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// Check that the condition doesn't reach either load. If so, folding
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// this will induce a cycle into the DAG.
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if ((!LLD->hasAnyUseOfValue(1) ||
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!LLD->isPredecessorOf(TheSelect->getOperand(0).getNode())) &&
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(!RLD->hasAnyUseOfValue(1) ||
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!RLD->isPredecessorOf(TheSelect->getOperand(0).getNode()))) {
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Addr = DAG.getNode(ISD::SELECT, TheSelect->getDebugLoc(),
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LLD->getBasePtr().getValueType(),
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TheSelect->getOperand(0), LLD->getBasePtr(),
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RLD->getBasePtr());
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}
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} else { // Otherwise SELECT_CC
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// Check that the condition doesn't reach either load. If so, folding
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// this will induce a cycle into the DAG.
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if ((!LLD->hasAnyUseOfValue(1) ||
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(!LLD->isPredecessorOf(TheSelect->getOperand(0).getNode()) &&
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!LLD->isPredecessorOf(TheSelect->getOperand(1).getNode()))) &&
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(!RLD->hasAnyUseOfValue(1) ||
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(!RLD->isPredecessorOf(TheSelect->getOperand(0).getNode()) &&
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!RLD->isPredecessorOf(TheSelect->getOperand(1).getNode())))) {
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Addr = DAG.getNode(ISD::SELECT_CC, TheSelect->getDebugLoc(),
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LLD->getBasePtr().getValueType(),
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TheSelect->getOperand(0),
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TheSelect->getOperand(1),
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LLD->getBasePtr(), RLD->getBasePtr(),
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TheSelect->getOperand(4));
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}
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}
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if (Addr.getNode()) {
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SDValue Load;
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if (LLD->getExtensionType() == ISD::NON_EXTLOAD) {
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Load = DAG.getLoad(TheSelect->getValueType(0),
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TheSelect->getDebugLoc(),
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// FIXME: Discards pointer info.
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LLD->getChain(), Addr, MachinePointerInfo(),
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LLD->isVolatile(), LLD->isNonTemporal(),
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LLD->getAlignment());
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} else {
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Load = DAG.getExtLoad(LLD->getExtensionType(),
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TheSelect->getValueType(0),
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TheSelect->getDebugLoc(),
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// FIXME: Discards pointer info.
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LLD->getChain(), Addr, MachinePointerInfo(),
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LLD->getMemoryVT(), LLD->isVolatile(),
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LLD->isNonTemporal(), LLD->getAlignment());
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}
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// Users of the select now use the result of the load.
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CombineTo(TheSelect, Load);
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// Users of the old loads now use the new load's chain. We know the
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// old-load value is dead now.
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CombineTo(LHS.getNode(), Load.getValue(0), Load.getValue(1));
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CombineTo(RHS.getNode(), Load.getValue(0), Load.getValue(1));
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return true;
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}
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}
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