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Generalize the SDOperand->SDOperand form of

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SelectionDAG::ReplaceAllUsesWith to handle replacement of
an SDOperand with *any* sdoperand, not just one for a node with
a single result.  Note that this has a horrible FIXME'd hack in it
to work around PR1975.  This should be removed when PR1975 is fixed.

llvm-svn: 46674
This commit is contained in:
Chris Lattner 2008-02-03 03:35:22 +00:00
parent df36b95e00
commit 096fa73683
1 changed files with 16 additions and 17 deletions
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33
lib/CodeGen/SelectionDAG/SelectionDAG.cpp
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@ -3173,14 +3173,18 @@ SDNode *SelectionDAG::getTargetNode(unsigned Opcode,
/// ReplaceAllUsesWith - Modify anything using 'From' to use 'To' instead.
/// This can cause recursive merging of nodes in the DAG.
///
/// This version assumes From/To have a single result value.
/// This version assumes From has a single result value.
///
void SelectionDAG::ReplaceAllUsesWith(SDOperand FromN, SDOperand ToN,
void SelectionDAG::ReplaceAllUsesWith(SDOperand FromN, SDOperand To,
std::vector<SDNode*> *Deleted) {
SDNode *From = FromN.Val, *To = ToN.Val;
assert(From->getNumValues() == 1 && To->getNumValues() == 1 &&
SDNode *From = FromN.Val;
// FIXME: This works around a dag isel emitter bug.
if (From->getNumValues() == 1 && FromN.ResNo != 0)
return; // FIXME: THIS IS BOGUS
assert(From->getNumValues() == 1 && FromN.ResNo == 0 &&
"Cannot replace with this method!");
assert(From != To && "Cannot replace uses of with self");
assert(From != To.Val && "Cannot replace uses of with self");
while (!From->use_empty()) {
// Process users until they are all gone.
@ -3193,8 +3197,8 @@ void SelectionDAG::ReplaceAllUsesWith(SDOperand FromN, SDOperand ToN,
I != E; ++I)
if (I->Val == From) {
From->removeUser(U);
I->Val = To;
To->addUser(U);
*I = To;
To.Val->addUser(U);
}
// Now that we have modified U, add it back to the CSE maps. If it already
@ -3219,10 +3223,8 @@ void SelectionDAG::ReplaceAllUsesWith(SDNode *From, SDNode *To,
assert(From != To && "Cannot replace uses of with self");
assert(From->getNumValues() == To->getNumValues() &&
"Cannot use this version of ReplaceAllUsesWith!");
if (From->getNumValues() == 1) { // If possible, use the faster version.
ReplaceAllUsesWith(SDOperand(From, 0), SDOperand(To, 0), Deleted);
return;
}
if (From->getNumValues() == 1) // If possible, use the faster version.
return ReplaceAllUsesWith(SDOperand(From, 0), SDOperand(To, 0), Deleted);
while (!From->use_empty()) {
// Process users until they are all gone.
@ -3258,11 +3260,8 @@ void SelectionDAG::ReplaceAllUsesWith(SDNode *From, SDNode *To,
void SelectionDAG::ReplaceAllUsesWith(SDNode *From,
const SDOperand *To,
std::vector<SDNode*> *Deleted) {
if (From->getNumValues() == 1 && To[0].Val->getNumValues() == 1) {
// Degenerate case handled above.
ReplaceAllUsesWith(SDOperand(From, 0), To[0], Deleted);
return;
}
if (From->getNumValues() == 1) // Handle the simple case efficiently.
return ReplaceAllUsesWith(SDOperand(From, 0), To[0], Deleted);
while (!From->use_empty()) {
// Process users until they are all gone.
@ -3298,7 +3297,7 @@ void SelectionDAG::ReplaceAllUsesOfValueWith(SDOperand From, SDOperand To,
std::vector<SDNode*> *Deleted) {
assert(From != To && "Cannot replace a value with itself");
// Handle the simple, trivial, case efficiently.
if (From.Val->getNumValues() == 1 && To.Val->getNumValues() == 1) {
if (From.Val->getNumValues() == 1) {
ReplaceAllUsesWith(From, To, Deleted);
return;
}