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* Spell "necessary" correctly 

* Print floating point values using C99 hexadecimal style FP if possible.
  This increases the number of floating point constants that may be emitted
  inline, and improves precision for global variable initializers which
  can not be emitted in integer form.

This fixes the Olden/Power benchmark with the CBE!!!!

llvm-svn: 9052
This commit is contained in:
Chris Lattner 2003-10-12 08:12:58 +00:00
parent 2e5cfa4fe8
commit 1d243169d9
1 changed files with 24 additions and 3 deletions
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27
llvm/lib/CWriter/Writer.cpp
View File

@ -23,6 +23,10 @@
#include <algorithm>
#include <sstream>
/* FIXME: This should be autoconf'd! */
#define HAS_C99_HEXADECIMAL_CONSTANTS 1
namespace {
class CWriter : public Pass, public InstVisitor<CWriter> {
std::ostream &Out;
@ -337,6 +341,16 @@ void CWriter::printConstantArray(ConstantArray *CPA) {
// only deal in IEEE FP).
//
static bool isFPCSafeToPrint(const ConstantFP *CFP) {
#if HAS_C99_HEXADECIMAL_CONSTANTS
char Buffer[100];
sprintf(Buffer, "%a", CFP->getValue());
if (!strncmp(Buffer, "0x", 2) ||
!strncmp(Buffer, "-0x", 3) ||
!strncmp(Buffer, "+0x", 3))
return atof(Buffer) == CFP->getValue();
return false;
#else
std::string StrVal = ftostr(CFP->getValue());
while (StrVal[0] == ' ')
@ -350,6 +364,7 @@ static bool isFPCSafeToPrint(const ConstantFP *CFP) {
// Reparse stringized version!
return atof(StrVal.c_str()) == CFP->getValue();
return false;
#endif
}
// printConstant - The LLVM Constant to C Constant converter.
@ -442,8 +457,14 @@ void CWriter::printConstant(Constant *CPV) {
Out << "(*(" << (FPC->getType() == Type::FloatTy ? "float" : "double")
<< "*)&FPConstant" << I->second << ")";
} else {
#if HAS_C99_HEXADECIMAL_CONSTANTS
// Print out the constant as a floating point number.
char Buffer[100];
sprintf(Buffer, "%a", FPC->getValue());
Out << Buffer << " /*" << FPC->getValue() << "*/ ";
#else
Out << ftostr(FPC->getValue());
#endif
}
break;
}
@ -1018,7 +1039,7 @@ void CWriter::visitUnwindInst(UnwindInst &I) {
emittedInvoke = true;
}
static bool isGotoCodeNeccessary(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
@ -1051,14 +1072,14 @@ void CWriter::printBranchToBlock(BasicBlock *CurBB, BasicBlock *Succ,
//
void CWriter::visitBranchInst(BranchInst &I) {
if (I.isConditional()) {
if (isGotoCodeNeccessary(I.getParent(), I.getSuccessor(0))) {
if (isGotoCodeNecessary(I.getParent(), I.getSuccessor(0))) {
Out << " if (";
writeOperand(I.getCondition());
Out << ") {\n";
printBranchToBlock(I.getParent(), I.getSuccessor(0), 2);
if (isGotoCodeNeccessary(I.getParent(), I.getSuccessor(1))) {
if (isGotoCodeNecessary(I.getParent(), I.getSuccessor(1))) {
Out << " } else {\n";
printBranchToBlock(I.getParent(), I.getSuccessor(1), 2);
}