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Added support for the llvm.readio and llvm.writeio intrinsics.

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On x86, memory operations occur in-order, so these are just lowered into
volatile loads and stores.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12936 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
John Criswell 2004-04-13 22:13:14 +00:00
parent 82c5a9990f
commit e5a4c15da6
2 changed files with 58 additions and 0 deletions
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29
lib/Target/X86/InstSelectSimple.cpp
View File

@ -1541,6 +1541,35 @@ void ISel::LowerUnknownIntrinsicFunctionCalls(Function &F) {
case Intrinsic::writeport:
// We directly implement these intrinsics
break;
case Intrinsic::readio: {
// On X86, memory operations are in-order. Lower this intrinsic
// into a volatile load.
Instruction *Before = CI->getPrev();
LoadInst * LI = new LoadInst (CI->getOperand(1), "", true, CI);
CI->replaceAllUsesWith (LI);
BB->getInstList().erase (CI);
if (Before) { // Move iterator to instruction after call
I = Before; ++I;
} else {
I = BB->begin();
}
break;
}
case Intrinsic::writeio: {
// On X86, memory operations are in-order. Lower this intrinsic
// into a volatile store.
Instruction *Before = CI->getPrev();
StoreInst * LI = new StoreInst (CI->getOperand(1),
CI->getOperand(2), true, CI);
CI->replaceAllUsesWith (LI);
BB->getInstList().erase (CI);
if (Before) { // Move iterator to instruction after call
I = Before; ++I;
} else {
I = BB->begin();
}
break;
}
default:
// All other intrinsic calls we must lower.
Instruction *Before = CI->getPrev();

29
lib/Target/X86/X86ISelSimple.cpp
View File

@ -1541,6 +1541,35 @@ void ISel::LowerUnknownIntrinsicFunctionCalls(Function &F) {
case Intrinsic::writeport:
// We directly implement these intrinsics
break;
case Intrinsic::readio: {
// On X86, memory operations are in-order. Lower this intrinsic
// into a volatile load.
Instruction *Before = CI->getPrev();
LoadInst * LI = new LoadInst (CI->getOperand(1), "", true, CI);
CI->replaceAllUsesWith (LI);
BB->getInstList().erase (CI);
if (Before) { // Move iterator to instruction after call
I = Before; ++I;
} else {
I = BB->begin();
}
break;
}
case Intrinsic::writeio: {
// On X86, memory operations are in-order. Lower this intrinsic
// into a volatile store.
Instruction *Before = CI->getPrev();
StoreInst * LI = new StoreInst (CI->getOperand(1),
CI->getOperand(2), true, CI);
CI->replaceAllUsesWith (LI);
BB->getInstList().erase (CI);
if (Before) { // Move iterator to instruction after call
I = Before; ++I;
} else {
I = BB->begin();
}
break;
}
default:
// All other intrinsic calls we must lower.
Instruction *Before = CI->getPrev();