Improve the heuristic to emit the alias if the number of hard-coded registers
are also greater than the alias.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@133038 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/utils/TableGen/AsmWriterEmitter.cpp b/utils/TableGen/AsmWriterEmitter.cpp
index 3eedf10..bfc63c0 100644
--- a/utils/TableGen/AsmWriterEmitter.cpp
+++ b/utils/TableGen/AsmWriterEmitter.cpp
@@ -842,6 +842,26 @@
return NumOps;
}
+static unsigned CountResultNumOperands(StringRef AsmString) {
+ unsigned NumOps = 0;
+ std::pair<StringRef, StringRef> ASM = AsmString.split('\t');
+
+ if (!ASM.second.empty()) {
+ size_t I = ASM.second.find('{');
+ StringRef Str = ASM.second;
+ if (I != StringRef::npos)
+ Str = ASM.second.substr(I, ASM.second.find('|', I));
+
+ ASM = Str.split(' ');
+
+ do {
+ ++NumOps;
+ ASM = ASM.second.split(' ');
+ } while (!ASM.second.empty());
+ }
+
+ return NumOps;
+}
void AsmWriterEmitter::EmitPrintAliasInstruction(raw_ostream &O) {
CodeGenTarget Target(Records);
@@ -887,9 +907,11 @@
II = Aliases.begin(), IE = Aliases.end(); II != IE; ++II) {
const CodeGenInstAlias *CGA = *II;
unsigned LastOpNo = CGA->ResultInstOperandIndex.size();
+ unsigned NumResultOps =
+ CountResultNumOperands(CGA->ResultInst->AsmString);
// Don't emit the alias if it has more operands than what it's aliasing.
- if (LastOpNo < CountNumOperands(CGA->AsmString))
+ if (NumResultOps < CountNumOperands(CGA->AsmString))
continue;
IAPrinter *IAP = new IAPrinter(AWI, CGA->Result->getAsString(),