RPCS3/llvm-mirror
1
0
Fork 0
mirror of https://github.com/RPCS3/llvm-mirror.git synced 2024-10-20 19:42:54 +02:00
Code Issues Projects Releases Wiki Activity

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

Browse Source 
to 64-bit precision, not 80 bits.

llvm-svn: 18915
This commit is contained in:
Chris Lattner 2004-12-13 21:52:52 +00:00
parent 10f69abc85
commit 0e9a9d2098
1 changed files with 13 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

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";