================
@@ -5902,6 +5914,92 @@ Register
LoongArchTargetLowering::getExceptionSelectorRegister(
return LoongArch::R5;
}
+//===----------------------------------------------------------------------===//
+// Target Optimization Hooks
+//===----------------------------------------------------------------------===//
+
+static int getEstimateRefinementSteps(EVT VT,
+ const LoongArchSubtarget &Subtarget) {
+ // Feature FRECIPE instrucions relative accuracy is 2^-14.
+ // IEEE float has 23 digits and double has 52 digits.
+ int RefinementSteps = VT.getScalarType() == MVT::f64 ? 2 : 1;
+ return RefinementSteps;
+}
+
+SDValue LoongArchTargetLowering::getSqrtEstimate(SDValue Operand,
+ SelectionDAG &DAG, int
Enabled,
+ int &RefinementSteps,
+ bool &UseOneConstNR,
+ bool Reciprocal) const {
+ if (Subtarget.hasFrecipe()) {
+ SDLoc DL(Operand);
+ EVT VT = Operand.getValueType();
+ unsigned Opcode;
+
+ if (VT == MVT::f32) {
+ Opcode = LoongArchISD::FRSQRTE_S;
+ } else if (VT == MVT::f64 && Subtarget.hasBasicD()) {
+ Opcode = LoongArchISD::FRSQRTE_D;
+ } else if (VT == MVT::v4f32 && Subtarget.hasExtLSX()) {
+ Opcode = LoongArchISD::VFRSQRTE_S;
+ } else if (VT == MVT::v2f64 && Subtarget.hasExtLSX()) {
+ Opcode = LoongArchISD::VFRSQRTE_D;
+ } else if (VT == MVT::v8f32 && Subtarget.hasExtLASX()) {
+ Opcode = LoongArchISD::XVFRSQRTE_S;
+ } else if (VT == MVT::v4f64 && Subtarget.hasExtLASX()) {
+ Opcode = LoongArchISD::XVFRSQRTE_D;
+ } else {
+ return SDValue();
+ }
+
+ UseOneConstNR = false;
+ if (RefinementSteps == ReciprocalEstimate::Unspecified)
+ RefinementSteps = getEstimateRefinementSteps(VT, Subtarget);
+
+ SDValue Estimate = DAG.getNode(Opcode, DL, VT, Operand);
+ if (Reciprocal) {
----------------
SixWeining wrote:
Useless `{}`.
https://github.com/llvm/llvm-project/pull/109917
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