Revert "[ARM][FPEnv] Lowering of fpenv intrinsics"

This reverts commit d62f040.
Some cuda buildbots start failing.

Author: spavloff

llvm/include/llvm/Target/TargetSelectionDAG.td

@@ -617,9 +617,6 @@ def strict_uint_to_fp : SDNode<"ISD::STRICT_UINT_TO_FP",
 def strict_fsetcc  : SDNode<"ISD::STRICT_FSETCC",  SDTSetCC, [SDNPHasChain]>;
 def strict_fsetccs : SDNode<"ISD::STRICT_FSETCCS", SDTSetCC, [SDNPHasChain]>;
 
-def get_fpenv      : SDNode<"ISD::GET_FPENV", SDTGetFPStateOp, [SDNPHasChain]>;
-def set_fpenv      : SDNode<"ISD::SET_FPENV", SDTSetFPStateOp, [SDNPHasChain]>;
-def reset_fpenv    : SDNode<"ISD::RESET_FPENV", SDTNone, [SDNPHasChain]>;
 def get_fpmode     : SDNode<"ISD::GET_FPMODE", SDTGetFPStateOp, [SDNPHasChain]>;
 def set_fpmode     : SDNode<"ISD::SET_FPMODE", SDTSetFPStateOp, [SDNPHasChain]>;
 def reset_fpmode   : SDNode<"ISD::RESET_FPMODE", SDTNone, [SDNPHasChain]>;

llvm/lib/Target/ARM/ARMISelLowering.cpp

@@ -1411,9 +1411,6 @@ ARMTargetLowering::ARMTargetLowering(const TargetMachine &TM,
     setOperationAction(ISD::BITCAST, MVT::i64, Custom);
     setOperationAction(ISD::GET_ROUNDING, MVT::i32, Custom);
     setOperationAction(ISD::SET_ROUNDING, MVT::Other, Custom);
-    setOperationAction(ISD::GET_FPENV, MVT::i32, Legal);
-    setOperationAction(ISD::SET_FPENV, MVT::i32, Legal);
-    setOperationAction(ISD::RESET_FPENV, MVT::Other, Legal);
   }
 
   // We want to custom lower some of our intrinsics.

llvm/lib/Target/ARM/ARMInstrVFP.td

@@ -2670,11 +2670,6 @@ def : Pat<(f32 (vfp_f32f16imm:$imm)),
   let Predicates = [HasFullFP16];
 }
 
-// Floating-point environment management.
-def : Pat<(get_fpenv), (VMRS)>;
-def : Pat<(set_fpenv GPRnopc:$Rt), (VMSR GPRnopc:$Rt)>;
-def : Pat<(reset_fpenv), (VMSR 0)>;
-
 //===----------------------------------------------------------------------===//
 // Assembler aliases.
 //

llvm/test/CodeGen/ARM/fpenv.ll

@@ -79,16 +79,6 @@ entry:
   ret i32 %fpenv
 }
 
-define i32 @get_fpenv_02() nounwind {
-; CHECK-LABEL: get_fpenv_02:
-; CHECK:       @ %bb.0: @ %entry
-; CHECK-NEXT:    vmrs r0, fpscr
-; CHECK-NEXT:    mov pc, lr
-entry:
-  %fpenv = call i32 @llvm.get.fpenv.i32()
-  ret i32 %fpenv
-}
-
 define void @set_fpenv_01(i32 %fpenv) #0 {
 ; CHECK-LABEL: set_fpenv_01:
 ; CHECK:       @ %bb.0: @ %entry
@@ -107,16 +97,6 @@ entry:
   ret void
 }
 
-define void @set_fpenv_02(i32 %fpenv) nounwind {
-; CHECK-LABEL: set_fpenv_02:
-; CHECK:       @ %bb.0: @ %entry
-; CHECK-NEXT:    vmsr fpscr, r0
-; CHECK-NEXT:    mov pc, lr
-entry:
-  call void @llvm.set.fpenv.i32(i32 %fpenv)
-  ret void
-}
-
 define void @reset_fpenv_01() #0 {
 ; CHECK-LABEL: reset_fpenv_01:
 ; CHECK:       @ %bb.0: @ %entry
@@ -131,16 +111,6 @@ entry:
   ret void
 }
 
-define void @reset_fpenv_02() nounwind {
-; CHECK-LABEL: reset_fpenv_02:
-; CHECK:       @ %bb.0: @ %entry
-; CHECK-NEXT:    vmsr fpscr, #0
-; CHECK-NEXT:    mov pc, lr
-entry:
-  call void @llvm.reset.fpenv()
-  ret void
-}
-
 attributes #0 = { nounwind "use-soft-float"="true" }
 
 declare void @llvm.set.rounding(i32)