return TargetLowering::findRepresentativeClass(TRI, VT);
}
+bool HexagonTargetLowering::shouldReduceLoadWidth(SDNode *Load,
+ ISD::LoadExtType ExtTy, EVT NewVT) const {
+ auto *L = cast<LoadSDNode>(Load);
+ std::pair<SDValue,int> BO = getBaseAndOffset(L->getBasePtr());
+ // Small-data object, do not shrink.
+ if (BO.first.getOpcode() == HexagonISD::CONST32_GP)
+ return false;
+ if (GlobalAddressSDNode *GA = dyn_cast<GlobalAddressSDNode>(BO.first)) {
+ auto &HTM = static_cast<const HexagonTargetMachine&>(getTargetMachine());
+ const auto *GO = dyn_cast_or_null<const GlobalObject>(GA->getGlobal());
+ return !GO || !HTM.getObjFileLowering()->isGlobalInSmallSection(GO, HTM);
+ }
+ return true;
+}
+
Value *HexagonTargetLowering::emitLoadLinked(IRBuilder<> &Builder, Value *Addr,
AtomicOrdering Ord) const {
BasicBlock *BB = Builder.GetInsertBlock();
SDValue getPICJumpTableRelocBase(SDValue Table, SelectionDAG &DAG)
const override;
+ bool shouldReduceLoadWidth(SDNode *Load, ISD::LoadExtType ExtTy,
+ EVT NewVT) const override;
+
// Handling of atomic RMW instructions.
Value *emitLoadLinked(IRBuilder<> &Builder, Value *Addr,
AtomicOrdering Ord) const override;
--- /dev/null
+; RUN: llc -march=hexagon -hexagon-small-data-threshold=8 < %s | FileCheck %s
+; CHECK: = memd(gp+#g0)
+; If an object will be placed in .sdata, do not shrink any references to it.
+; In this case, g0 must be loaded via memd.
+
+target triple = "hexagon"
+
+@g0 = common global i64 0, align 8
+
+define i32 @f0() #0 {
+entry:
+ %v0 = load i64, i64* @g0, align 8
+ %v1 = trunc i64 %v0 to i8
+ %v2 = zext i8 %v1 to i32
+ ret i32 %v2
+}
+
+attributes #0 = { nounwind "target-cpu"="hexagonv60" "target-features"="+small-data" }
+