GlobalISel: support translating va_arg
Since (say) i128 and [16 x i8] map to the same type in generic MIR, we also
need to attach the required alignment info.
llvm-svn: 295254
diff --git a/llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp b/llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp
index c5ac42f..e80dac1 100644
--- a/llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp
+++ b/llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp
@@ -906,6 +906,18 @@
return true;
}
+bool IRTranslator::translateVAArg(const User &U, MachineIRBuilder &MIRBuilder) {
+ // FIXME: We may need more info about the type. Because of how LLT works,
+ // we're completely discarding the i64/double distinction here (amongst
+ // others). Fortunately the ABIs I know of where that matters don't use va_arg
+ // anyway but that's not guaranteed.
+ MIRBuilder.buildInstr(TargetOpcode::G_VAARG)
+ .addDef(getOrCreateVReg(U))
+ .addUse(getOrCreateVReg(*U.getOperand(0)))
+ .addImm(DL->getABITypeAlignment(U.getType()));
+ return true;
+}
+
bool IRTranslator::translatePHI(const User &U, MachineIRBuilder &MIRBuilder) {
const PHINode &PI = cast<PHINode>(U);
auto MIB = MIRBuilder.buildInstr(TargetOpcode::PHI);