For now, restrict FastISel to instructions that only involve one
register class.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@55008 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/utils/TableGen/FastISelEmitter.cpp b/utils/TableGen/FastISelEmitter.cpp
index 31e0d19..b434c15 100644
--- a/utils/TableGen/FastISelEmitter.cpp
+++ b/utils/TableGen/FastISelEmitter.cpp
@@ -62,7 +62,8 @@
///
bool initialize(TreePatternNode *InstPatNode,
const CodeGenTarget &Target,
- MVT::SimpleValueType VT) {
+ MVT::SimpleValueType VT,
+ const CodeGenRegisterClass *DstRC) {
for (unsigned i = 0, e = InstPatNode->getNumChildren(); i != e; ++i) {
TreePatternNode *Op = InstPatNode->getChild(i);
if (!Op->isLeaf())
@@ -82,6 +83,9 @@
const CodeGenRegisterClass *RC = &Target.getRegisterClass(OpLeafRec);
if (!RC)
return false;
+ // For now, all the operands must have the same register class.
+ if (DstRC != RC)
+ return false;
// For now, all the operands must have the same type.
if (Op->getTypeNum(0) != VT)
return false;
@@ -230,7 +234,7 @@
// Check all the operands.
OperandsSignature Operands;
- if (!Operands.initialize(InstPatNode, Target, VT))
+ if (!Operands.initialize(InstPatNode, Target, VT, DstRC))
continue;
// If it's not a known signature, ignore it.