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Print all PHI copies for successor blocks before the terminator, whether it be a conditional branch or switch.

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llvm-svn: 13430
This commit is contained in:
Chris Lattner 2004-05-09 03:42:48 +00:00
parent 0efd1cb264
commit 99b7c2b532
1 changed files with 23 additions and 10 deletions
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21
lib/Target/CBackend/Writer.cpp
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@ -27,6 +27,7 @@
#include "llvm/Analysis/ConstantsScanner.h"
#include "llvm/Transforms/Scalar.h"
#include "llvm/Support/CallSite.h"
#include "llvm/Support/CFG.h"
#include "llvm/Support/GetElementPtrTypeIterator.h"
#include "llvm/Support/InstVisitor.h"
#include "llvm/Support/Mangler.h"
@ -162,6 +163,8 @@ namespace {
void outputLValue(Instruction *I) {
Out << " " << Mang->getValueName(I) << " = ";
}
void printPHICopiesForSuccessors(BasicBlock *CurBlock,
unsigned Indent);
void printBranchToBlock(BasicBlock *CurBlock, BasicBlock *SuccBlock,
unsigned Indent);
void printIndexingExpression(Value *Ptr, gep_type_iterator I,
@ -1035,6 +1038,8 @@ void CWriter::visitReturnInst(ReturnInst &I) {
}
void CWriter::visitSwitchInst(SwitchInst &SI) {
printPHICopiesForSuccessors(SI.getParent(), 0);
Out << " switch (";
writeOperand(SI.getOperand(0));
Out << ") {\n default:\n";
@ -1061,7 +1066,7 @@ void CWriter::visitUnwindInst(UnwindInst &I) {
assert(0 && "Lowerinvoke pass didn't work!");
}
bool isGotoCodeNecessary(BasicBlock *From, BasicBlock *To) {
static bool isGotoCodeNecessary(BasicBlock *From, BasicBlock *To) {
// If PHI nodes need copies, we need the copy code...
if (isa<PHINode>(To->front()) ||
From->getNext() != To) // Not directly successor, need goto
@ -1071,17 +1076,23 @@ bool isGotoCodeNecessary(BasicBlock *From, BasicBlock *To) {
return false;
}
void CWriter::printBranchToBlock(BasicBlock *CurBB, BasicBlock *Succ,
void CWriter::printPHICopiesForSuccessors(BasicBlock *CurBlock,
unsigned Indent) {
for (BasicBlock::iterator I = Succ->begin();
for (succ_iterator SI = succ_begin(CurBlock), E = succ_end(CurBlock);
SI != E; ++SI)
for (BasicBlock::iterator I = SI->begin();
PHINode *PN = dyn_cast<PHINode>(I); ++I) {
// now we have to do the printing
Out << std::string(Indent, ' ');
Out << " " << Mang->getValueName(I) << "__PHI_TEMPORARY = ";
writeOperand(PN->getIncomingValue(PN->getBasicBlockIndex(CurBB)));
writeOperand(PN->getIncomingValue(PN->getBasicBlockIndex(CurBlock)));
Out << "; /* for PHI node */\n";
}
}
void CWriter::printBranchToBlock(BasicBlock *CurBB, BasicBlock *Succ,
unsigned Indent) {
if (CurBB->getNext() != Succ ||
isa<InvokeInst>(CurBB->getTerminator()) ||
isa<SwitchInst>(CurBB->getTerminator())) {
@ -1095,6 +1106,8 @@ void CWriter::printBranchToBlock(BasicBlock *CurBB, BasicBlock *Succ,
// that immediately succeeds the current one.
//
void CWriter::visitBranchInst(BranchInst &I) {
printPHICopiesForSuccessors(I.getParent(), 0);
if (I.isConditional()) {
if (isGotoCodeNecessary(I.getParent(), I.getSuccessor(0))) {
Out << " if (";