[PATCH] D81843: [ARM][FPEnv] Lowering of {get,set,reset}_fpenv

[John Brawn via Phabricator via llvm-commits]

john.brawn added inline comments.


================
Comment at: llvm/lib/Target/ARM/ARMISelLowering.cpp:6444-6472
+SDValue ARMTargetLowering::LowerGET_FPENV(SDValue Op, SelectionDAG &DAG) const {
+  SDLoc DL(Op);
+  SDValue Chain = Op->getOperand(0);
+  SDValue Ops[] = {Chain,
+                   DAG.getConstant(Intrinsic::arm_get_fpscr, DL, MVT::i32)};
+  SDValue FPSCR =
+      DAG.getNode(ISD::INTRINSIC_W_CHAIN, DL, {MVT::i32, MVT::Other}, Ops);
----------------
This could be done more simply by setting these nodes to Legal having tablegen patterns instead, e.g.

```
def : Pat<(get_fpenv), (VMRS)>;
def : Pat<(set_fpenv GPRnopc:$Rt), (VMSR GPRnopc:$Rt)>;
def : Pat<(reset_fpenv), (VMSR 0)>;
```
(though it requires get_fpenv etc. nodes being added to TargetSelectionDAG.td).


Repository:
  rG LLVM Github Monorepo

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  https://reviews.llvm.org/D81843/new/

https://reviews.llvm.org/D81843