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When generating code for X86 targets, make sure the fp control word is set

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to 64-bit precision, not 80 bits.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@18915 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2004-12-13 21:52:52 +00:00
parent f7d4f10a0d
commit 395fd5949b
2 changed files with 26 additions and 0 deletions
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13
lib/Target/CBackend/CBackend.cpp
View File

@ -214,6 +214,7 @@ namespace {
unsigned Indent);
void printIndexingExpression(Value *Ptr, gep_type_iterator I,
gep_type_iterator E);
void printCodeForMain();
};
}
@ -1127,6 +1128,9 @@ void CWriter::printFunction(Function &F) {
Out << "\n";
if (F.hasExternalLinkage() && F.getName() == "main")
printCodeForMain();
// print the basic blocks
for (Function::iterator BB = F.begin(), E = F.end(); BB != E; ++BB) {
if (Loop *L = LI->getLoopFor(BB)) {
@ -1140,6 +1144,15 @@ void CWriter::printFunction(Function &F) {
Out << "}\n\n";
}
void CWriter::printCodeForMain() {
// On X86, set the FP control word to 64-bits of precision instead of 80 bits.
Out << "#if defined(__GNUC__) && !defined(__llvm__)\n"
<< "#if defined(i386) || defined(__i386__) || defined(__i386)\n"
<< "{short FPCW;__asm__ (\"fnstcw %0\" : \"=m\" (*&FPCW));\n"
<< "FPCW=(FPCW&~0x300)|0x200;__asm__(\"fldcw %0\" :: \"m\" (*&FPCW));}\n"
<< "#endif\n#endif\n";
}
void CWriter::printLoop(Loop *L) {
Out << " do { /* Syntactic loop '" << L->getHeader()->getName()
<< "' to make GCC happy */\n";

13
lib/Target/CBackend/Writer.cpp
View File

@ -214,6 +214,7 @@ namespace {
unsigned Indent);
void printIndexingExpression(Value *Ptr, gep_type_iterator I,
gep_type_iterator E);
void printCodeForMain();
};
}
@ -1127,6 +1128,9 @@ void CWriter::printFunction(Function &F) {
Out << "\n";
if (F.hasExternalLinkage() && F.getName() == "main")
printCodeForMain();
// print the basic blocks
for (Function::iterator BB = F.begin(), E = F.end(); BB != E; ++BB) {
if (Loop *L = LI->getLoopFor(BB)) {
@ -1140,6 +1144,15 @@ void CWriter::printFunction(Function &F) {
Out << "}\n\n";
}
void CWriter::printCodeForMain() {
// On X86, set the FP control word to 64-bits of precision instead of 80 bits.
Out << "#if defined(__GNUC__) && !defined(__llvm__)\n"
<< "#if defined(i386) || defined(__i386__) || defined(__i386)\n"
<< "{short FPCW;__asm__ (\"fnstcw %0\" : \"=m\" (*&FPCW));\n"
<< "FPCW=(FPCW&~0x300)|0x200;__asm__(\"fldcw %0\" :: \"m\" (*&FPCW));}\n"
<< "#endif\n#endif\n";
}
void CWriter::printLoop(Loop *L) {
Out << " do { /* Syntactic loop '" << L->getHeader()->getName()
<< "' to make GCC happy */\n";