[LoongArch] Mark ISD::FNEG as legal

Author: wangleiat

llvm/lib/Target/LoongArch/LoongArchISelLowering.cpp

@@ -270,6 +270,7 @@ LoongArchTargetLowering::LoongArchTargetLowering(const TargetMachine &TM,
       setOperationAction({ISD::FMUL, ISD::FDIV}, VT, Legal);
       setOperationAction(ISD::FMA, VT, Legal);
       setOperationAction(ISD::FSQRT, VT, Legal);
+      setOperationAction(ISD::FNEG, VT, Legal);
       setCondCodeAction({ISD::SETGE, ISD::SETGT, ISD::SETOGE, ISD::SETOGT,
                          ISD::SETUGE, ISD::SETUGT},
                         VT, Expand);
@@ -311,6 +312,7 @@ LoongArchTargetLowering::LoongArchTargetLowering(const TargetMachine &TM,
       setOperationAction({ISD::FMUL, ISD::FDIV}, VT, Legal);
       setOperationAction(ISD::FMA, VT, Legal);
       setOperationAction(ISD::FSQRT, VT, Legal);
+      setOperationAction(ISD::FNEG, VT, Legal);
       setCondCodeAction({ISD::SETGE, ISD::SETGT, ISD::SETOGE, ISD::SETOGT,
                          ISD::SETUGE, ISD::SETUGT},
                         VT, Expand);

llvm/lib/Target/LoongArch/LoongArchLASXInstrInfo.td

@@ -1605,6 +1605,10 @@ foreach vt = [v32i8, v16i16, v8i32, v4i64, v8f32, v4f64] in
   def  : Pat<(vt (vselect LASX256:$xa, LASX256:$xk, LASX256:$xj)),
              (XVBITSEL_V LASX256:$xj, LASX256:$xk, LASX256:$xa)>;
 
+// fneg
+def : Pat<(fneg (v8f32 LASX256:$xj)), (XVBITREVI_W LASX256:$xj, 31)>;
+def : Pat<(fneg (v4f64 LASX256:$xj)), (XVBITREVI_D LASX256:$xj, 63)>;
+
 } // Predicates = [HasExtLASX]
 
 /// Intrinsic pattern

llvm/lib/Target/LoongArch/LoongArchLSXInstrInfo.td

@@ -1712,6 +1712,10 @@ foreach vt = [v16i8, v8i16, v4i32, v2i64, v4f32, v2f64] in
   def  : Pat<(vt (vselect LSX128:$va, LSX128:$vk, LSX128:$vj)),
              (VBITSEL_V LSX128:$vj, LSX128:$vk, LSX128:$va)>;
 
+// fneg
+def : Pat<(fneg (v4f32 LSX128:$vj)), (VBITREVI_W LSX128:$vj, 31)>;
+def : Pat<(fneg (v2f64 LSX128:$vj)), (VBITREVI_D LSX128:$vj, 63)>;
+
 } // Predicates = [HasExtLSX]
 
 /// Intrinsic pattern

llvm/test/CodeGen/LoongArch/lasx/ir-instruction/fneg.ll

@@ -0,0 +1,29 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+; RUN: llc --mtriple=loongarch64 --mattr=+lasx < %s | FileCheck %s
+
+define void @fneg_v8f32(ptr %res, ptr %a0) nounwind {
+; CHECK-LABEL: fneg_v8f32:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    xvld $xr0, $a1, 0
+; CHECK-NEXT:    xvbitrevi.w $xr0, $xr0, 31
+; CHECK-NEXT:    xvst $xr0, $a0, 0
+; CHECK-NEXT:    ret
+entry:
+  %v0 = load <8 x float>, ptr %a0
+  %v1 = fneg <8 x float> %v0
+  store <8 x float> %v1, ptr %res
+  ret void
+}
+define void @fneg_v4f64(ptr %res, ptr %a0) nounwind {
+; CHECK-LABEL: fneg_v4f64:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    xvld $xr0, $a1, 0
+; CHECK-NEXT:    xvbitrevi.d $xr0, $xr0, 63
+; CHECK-NEXT:    xvst $xr0, $a0, 0
+; CHECK-NEXT:    ret
+entry:
+  %v0 = load <4 x double>, ptr %a0
+  %v1 = fneg <4 x double> %v0
+  store <4 x double> %v1, ptr %res
+  ret void
+}

llvm/test/CodeGen/LoongArch/lsx/ir-instruction/fneg.ll

@@ -0,0 +1,29 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+; RUN: llc --mtriple=loongarch64 --mattr=+lsx < %s | FileCheck %s
+
+define void @fneg_v4f32(ptr %res, ptr %a0) nounwind {
+; CHECK-LABEL: fneg_v4f32:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    vld $vr0, $a1, 0
+; CHECK-NEXT:    vbitrevi.w $vr0, $vr0, 31
+; CHECK-NEXT:    vst $vr0, $a0, 0
+; CHECK-NEXT:    ret
+entry:
+  %v0 = load <4 x float>, ptr %a0
+  %v1 = fneg <4 x float> %v0
+  store <4 x float> %v1, ptr %res
+  ret void
+}
+define void @fneg_v2f64(ptr %res, ptr %a0) nounwind {
+; CHECK-LABEL: fneg_v2f64:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    vld $vr0, $a1, 0
+; CHECK-NEXT:    vbitrevi.d $vr0, $vr0, 63
+; CHECK-NEXT:    vst $vr0, $a0, 0
+; CHECK-NEXT:    ret
+entry:
+  %v0 = load <2 x double>, ptr %a0
+  %v1 = fneg <2 x double> %v0
+  store <2 x double> %v1, ptr %res
+  ret void
+}