[VP][RISCV] Add vp.fabs intrinsic and RISC-V support.

[craig.topper]

Summary

Mostly just modeled after vp.fneg except there is a
"functional instruction" for fneg while fabs is always an
intrinsic.

[fakepaper56]

LGTM.

[frasercrmck]

Do we need a new test in expand-vp.ll? It seems that test has been forgotten about somewhat. There's no fneg in there. Maybe the expansion for that hasn't been implemented? Hard to keep track.

[craig.topper]

In D132793#3754985, @frasercrmck wrote:

Do we need a new test in expand-vp.ll? It seems that test has been forgotten about somewhat. There's no fneg in there. Maybe the expansion for that hasn't been implemented? Hard to keep track.

Doesn't look like fneg has been implemented in the the expand pass. I don't see any code for unary operations.

llvm/docs/LangRef.rst

 """"""""""
 
 Return the same value as a corresponding libm '``fma``' function but without
 trapping or setting ``errno``.
 
 When specified with the fast-math-flag 'afn', the result may be approximated
 using a less accurate calculation.
 
+.. _int_fabs:
+
 '``llvm.fabs.*``' Intrinsic
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 Syntax:
 """""""
 
 This is an overloaded intrinsic. You can use ``llvm.fabs`` on any
 floating-point or vector of floating-point type. Not all targets support
.. code-block:: llvm
 
       %r = call <4 x float> @llvm.vp.fneg.v4f32(<4 x float> %a, <4 x i1> %mask, i32 %evl)
       ;; For all lanes below %evl, %r is lane-wise equivalent to %also.r
 
       %t = fneg <4 x float> %a
       %also.r = select <4 x i1> %mask, <4 x float> %t, <4 x float> undef
 
 
+.. _int_vp_fabs:
+
+'``llvm.vp.fabs.*``' Intrinsics
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Syntax:
+"""""""
+This is an overloaded intrinsic.
+
+::
+
+      declare <16 x float>  @llvm.vp.fabs.v16f32 (<16 x float> <op>, <16 x i1> <mask>, i32 <vector_length>)
+      declare <vscale x 4 x float>  @llvm.vp.fabs.nxv4f32 (<vscale x 4 x float> <op>, <vscale x 4 x i1> <mask>, i32 <vector_length>)
+      declare <256 x double>  @llvm.vp.fabs.v256f64 (<256 x double> <op>, <256 x i1> <mask>, i32 <vector_length>)
+
+Overview:
+"""""""""
+
+Predicated floating-point absolute value of a vector of floating-point values.
+
+
+Arguments:
+""""""""""
+
+The first operand and the result have the same vector of floating-point type.
+The second operand is the vector mask and has the same number of elements as the
+result vector type. The third operand is the explicit vector length of the
+operation.
+
+Semantics:
+""""""""""
+
+The '``llvm.vp.fabs``' intrinsic performs floating-point absolute value
+(:ref:`fabs <int_fabs>`) of the first vector operand on each enabled lane.  The
+result on disabled lanes is undefined.
+
+Examples:
+"""""""""
+
+.. code-block:: llvm
+
+      %r = call <4 x float> @llvm.vp.fabs.v4f32(<4 x float> %a, <4 x i1> %mask, i32 %evl)
+      ;; For all lanes below %evl, %r is lane-wise equivalent to %also.r
+
+      %t = call <4 x float> @llvm.fabs.v4f32(<4 x float> %a)
+      %also.r = select <4 x i1> %mask, <4 x float> %t, <4 x float> undef
+
+
 .. _int_vp_fma:
 
 '``llvm.vp.fma.*``' Intrinsics
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 Syntax:
 """""""
 This is an overloaded intrinsic.

llvm/include/llvm/IR/Intrinsics.td

def int_vp_frem : DefaultAttrsIntrinsic<[ llvm_anyvector_ty ],
                              [ LLVMMatchType<0>,
                                LLVMMatchType<0>,
                                LLVMScalarOrSameVectorWidth<0, llvm_i1_ty>,
                                llvm_i32_ty]>;
   def int_vp_fneg : DefaultAttrsIntrinsic<[ llvm_anyvector_ty ],
                              [ LLVMMatchType<0>,
                                LLVMScalarOrSameVectorWidth<0, llvm_i1_ty>,
                                llvm_i32_ty]>;
+  def int_vp_fabs : DefaultAttrsIntrinsic<[ llvm_anyvector_ty ],
+                             [ LLVMMatchType<0>,
+                               LLVMScalarOrSameVectorWidth<0, llvm_i1_ty>,
+                               llvm_i32_ty]>;
   def int_vp_fma : DefaultAttrsIntrinsic<[ llvm_anyvector_ty ],
                              [ LLVMMatchType<0>,
                                LLVMMatchType<0>,
                                LLVMMatchType<0>,
                                LLVMScalarOrSameVectorWidth<0, llvm_i1_ty>,
                                llvm_i32_ty]>;
 
   // Casts

llvm/include/llvm/IR/VPIntrinsics.def

 
 #undef HELPER_REGISTER_BINARY_FP_VP
 
 // llvm.vp.fneg(x,mask,vlen)
 BEGIN_REGISTER_VP(vp_fneg, 1, 2, VP_FNEG, -1)
 VP_PROPERTY_FUNCTIONAL_OPC(FNeg)
 END_REGISTER_VP(vp_fneg, VP_FNEG)
 
+// llvm.vp.fabs(x,mask,vlen)
+BEGIN_REGISTER_VP(vp_fabs, 1, 2, VP_FABS, -1)
+END_REGISTER_VP(vp_fabs, VP_FABS)
+
 // llvm.vp.fma(x,y,z,mask,vlen)
 BEGIN_REGISTER_VP(vp_fma, 3, 4, VP_FMA, -1)
 VP_PROPERTY_CONSTRAINEDFP(1, 1, experimental_constrained_fma)
 END_REGISTER_VP(vp_fma, VP_FMA)
 
 ///// } Floating-Point Arithmetic
 
 ///// Type Casts {

llvm/lib/CodeGen/SelectionDAG/LegalizeVectorTypes.cpp

#endif
   case ISD::ABS:
   case ISD::BITREVERSE:
   case ISD::BSWAP:
   case ISD::CTLZ:
   case ISD::CTTZ:
   case ISD::CTLZ_ZERO_UNDEF:
   case ISD::CTTZ_ZERO_UNDEF:
   case ISD::CTPOP:
-  case ISD::FABS:
+  case ISD::FABS: case ISD::VP_FABS:
   case ISD::FCEIL:
   case ISD::FCOS:
   case ISD::FEXP:
   case ISD::FEXP2:
   case ISD::FFLOOR:
   case ISD::FLOG:
   case ISD::FLOG10:
   case ISD::FLOG2:
#include "llvm/IR/ConstrainedOps.def"
   case ISD::BITREVERSE:
   case ISD::BSWAP:
   case ISD::CTLZ:
   case ISD::CTLZ_ZERO_UNDEF:
   case ISD::CTPOP:
   case ISD::CTTZ:
   case ISD::CTTZ_ZERO_UNDEF:
   case ISD::FNEG: case ISD::VP_FNEG:
+  case ISD::VP_FABS:
   case ISD::FREEZE:
   case ISD::ARITH_FENCE:
   case ISD::FCANONICALIZE:
     Res = WidenVecRes_Unary(N);
     break;
   case ISD::FMA: case ISD::VP_FMA:
   case ISD::FSHL:
   case ISD::FSHR:

llvm/lib/Target/RISCV/RISCVISelLowering.cpp

static const unsigned IntegerVPOps[] = {
         ISD::VP_SHL,         ISD::VP_REDUCE_ADD,  ISD::VP_REDUCE_AND,
         ISD::VP_REDUCE_OR,   ISD::VP_REDUCE_XOR,  ISD::VP_REDUCE_SMAX,
         ISD::VP_REDUCE_SMIN, ISD::VP_REDUCE_UMAX, ISD::VP_REDUCE_UMIN,
         ISD::VP_MERGE,       ISD::VP_SELECT,      ISD::VP_FP_TO_SINT,
         ISD::VP_FP_TO_UINT,  ISD::VP_SETCC,       ISD::VP_SIGN_EXTEND,
         ISD::VP_ZERO_EXTEND, ISD::VP_TRUNCATE};
 
     static const unsigned FloatingPointVPOps[] = {
-        ISD::VP_FADD,        ISD::VP_FSUB,
-        ISD::VP_FMUL,        ISD::VP_FDIV,
-        ISD::VP_FNEG,        ISD::VP_FMA,
-        ISD::VP_REDUCE_FADD, ISD::VP_REDUCE_SEQ_FADD,
-        ISD::VP_REDUCE_FMIN, ISD::VP_REDUCE_FMAX,
-        ISD::VP_MERGE,       ISD::VP_SELECT,
-        ISD::VP_SINT_TO_FP,  ISD::VP_UINT_TO_FP,
-        ISD::VP_SETCC,       ISD::VP_FP_ROUND,
-        ISD::VP_FP_EXTEND};
+        ISD::VP_FADD,        ISD::VP_FSUB,        ISD::VP_FMUL,
+        ISD::VP_FDIV,        ISD::VP_FNEG,        ISD::VP_FABS,
+        ISD::VP_FMA,         ISD::VP_REDUCE_FADD, ISD::VP_REDUCE_SEQ_FADD,
+        ISD::VP_REDUCE_FMIN, ISD::VP_REDUCE_FMAX, ISD::VP_MERGE,
+        ISD::VP_SELECT,      ISD::VP_SINT_TO_FP,  ISD::VP_UINT_TO_FP,
+        ISD::VP_SETCC,       ISD::VP_FP_ROUND,    ISD::VP_FP_EXTEND};
 
     static const unsigned IntegerVecReduceOps[] = {
         ISD::VECREDUCE_ADD,  ISD::VECREDUCE_AND,  ISD::VECREDUCE_OR,
         ISD::VECREDUCE_XOR,  ISD::VECREDUCE_SMAX, ISD::VECREDUCE_SMIN,
         ISD::VECREDUCE_UMAX, ISD::VECREDUCE_UMIN};
 
     static const unsigned FloatingPointVecReduceOps[] = {
         ISD::VECREDUCE_FADD, ISD::VECREDUCE_SEQ_FADD, ISD::VECREDUCE_FMIN,
SDValue RISCVTargetLowering::LowerOperation(SDValue Op,
   case ISD::VP_FSUB:
     return lowerVPOp(Op, DAG, RISCVISD::FSUB_VL, /*HasMergeOp*/ true);
   case ISD::VP_FMUL:
     return lowerVPOp(Op, DAG, RISCVISD::FMUL_VL, /*HasMergeOp*/ true);
   case ISD::VP_FDIV:
     return lowerVPOp(Op, DAG, RISCVISD::FDIV_VL, /*HasMergeOp*/ true);
   case ISD::VP_FNEG:
     return lowerVPOp(Op, DAG, RISCVISD::FNEG_VL);
+  case ISD::VP_FABS:
+    return lowerVPOp(Op, DAG, RISCVISD::FABS_VL);
   case ISD::VP_FMA:
     return lowerVPOp(Op, DAG, RISCVISD::VFMADD_VL);
   case ISD::VP_SIGN_EXTEND:
   case ISD::VP_ZERO_EXTEND:
     if (Op.getOperand(0).getSimpleValueType().getVectorElementType() == MVT::i1)
       return lowerVPExtMaskOp(Op, DAG);
     return lowerVPOp(Op, DAG,
                      Op.getOpcode() == ISD::VP_SIGN_EXTEND

llvm/lib/Target/RISCV/RISCVInstrInfoVVLPatterns.td

 foreach vti = AllFloatVectors in {
   // 14.8. Vector Floating-Point Square-Root Instruction
   def : Pat<(riscv_fsqrt_vl (vti.Vector vti.RegClass:$rs2), (vti.Mask true_mask),
                             VLOpFrag),
             (!cast<Instruction>("PseudoVFSQRT_V_"# vti.LMul.MX)
                  vti.RegClass:$rs2, GPR:$vl, vti.Log2SEW)>;
 
   // 14.12. Vector Floating-Point Sign-Injection Instructions
-  def : Pat<(riscv_fabs_vl (vti.Vector vti.RegClass:$rs), (vti.Mask true_mask),
+  def : Pat<(riscv_fabs_vl (vti.Vector vti.RegClass:$rs), (vti.Mask V0),
                            VLOpFrag),
-            (!cast<Instruction>("PseudoVFSGNJX_VV_"# vti.LMul.MX)
-                 vti.RegClass:$rs, vti.RegClass:$rs, GPR:$vl, vti.Log2SEW)>;
+            (!cast<Instruction>("PseudoVFSGNJX_VV_"# vti.LMul.MX #"_MASK")
+                 (vti.Vector (IMPLICIT_DEF)), vti.RegClass:$rs,
+                 vti.RegClass:$rs, (vti.Mask V0), GPR:$vl, vti.Log2SEW,
+                 TAIL_AGNOSTIC)>;
   // Handle fneg with VFSGNJN using the same input for both operands.
   def : Pat<(riscv_fneg_vl (vti.Vector vti.RegClass:$rs), (vti.Mask V0),
                            VLOpFrag),
             (!cast<Instruction>("PseudoVFSGNJN_VV_"# vti.LMul.MX #"_MASK")
                  (vti.Vector (IMPLICIT_DEF)), vti.RegClass:$rs,
                  vti.RegClass:$rs, (vti.Mask V0), GPR:$vl, vti.Log2SEW,
                  TAIL_AGNOSTIC)>;
 

llvm/test/CodeGen/RISCV/rvv/fixed-vectors-vfabs-vp.ll

+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+; RUN: llc -mtriple=riscv32 -mattr=+d,+zfh,+experimental-zvfh,+v -target-abi=ilp32d -riscv-v-vector-bits-min=128 \
+; RUN:   -verify-machineinstrs < %s | FileCheck %s
+; RUN: llc -mtriple=riscv64 -mattr=+d,+zfh,+experimental-zvfh,+v -target-abi=lp64d -riscv-v-vector-bits-min=128 \
+; RUN:   -verify-machineinstrs < %s | FileCheck %s
+
+declare <2 x half> @llvm.vp.fabs.v2f16(<2 x half>, <2 x i1>, i32)
+
+define <2 x half> @vfabs_vv_v2f16(<2 x half> %va, <2 x i1> %m, i32 zeroext %evl) {
+; CHECK-LABEL: vfabs_vv_v2f16:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    vsetvli zero, a0, e16, mf4, ta, mu
+; CHECK-NEXT:    vfabs.v v8, v8, v0.t
+; CHECK-NEXT:    ret
+  %v = call <2 x half> @llvm.vp.fabs.v2f16(<2 x half> %va, <2 x i1> %m, i32 %evl)
+  ret <2 x half> %v
+}
+
+define <2 x half> @vfabs_vv_v2f16_unmasked(<2 x half> %va, i32 zeroext %evl) {
+; CHECK-LABEL: vfabs_vv_v2f16_unmasked:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    vsetvli zero, a0, e16, mf4, ta, mu
+; CHECK-NEXT:    vfabs.v v8, v8
+; CHECK-NEXT:    ret
+  %head = insertelement <2 x i1> poison, i1 true, i32 0
+  %m = shufflevector <2 x i1> %head, <2 x i1> poison, <2 x i32> zeroinitializer
+  %v = call <2 x half> @llvm.vp.fabs.v2f16(<2 x half> %va, <2 x i1> %m, i32 %evl)
+  ret <2 x half> %v
+}
+
+declare <4 x half> @llvm.vp.fabs.v4f16(<4 x half>, <4 x i1>, i32)
+
+define <4 x half> @vfabs_vv_v4f16(<4 x half> %va, <4 x i1> %m, i32 zeroext %evl) {
+; CHECK-LABEL: vfabs_vv_v4f16:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    vsetvli zero, a0, e16, mf2, ta, mu
+; CHECK-NEXT:    vfabs.v v8, v8, v0.t
+; CHECK-NEXT:    ret
+  %v = call <4 x half> @llvm.vp.fabs.v4f16(<4 x half> %va, <4 x i1> %m, i32 %evl)
+  ret <4 x half> %v
+}
+
+define <4 x half> @vfabs_vv_v4f16_unmasked(<4 x half> %va, i32 zeroext %evl) {
+; CHECK-LABEL: vfabs_vv_v4f16_unmasked:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    vsetvli zero, a0, e16, mf2, ta, mu
+; CHECK-NEXT:    vfabs.v v8, v8
+; CHECK-NEXT:    ret
+  %head = insertelement <4 x i1> poison, i1 true, i32 0
+  %m = shufflevector <4 x i1> %head, <4 x i1> poison, <4 x i32> zeroinitializer
+  %v = call <4 x half> @llvm.vp.fabs.v4f16(<4 x half> %va, <4 x i1> %m, i32 %evl)
+  ret <4 x half> %v
+}
+
+declare <8 x half> @llvm.vp.fabs.v8f16(<8 x half>, <8 x i1>, i32)
+
+define <8 x half> @vfabs_vv_v8f16(<8 x half> %va, <8 x i1> %m, i32 zeroext %evl) {
+; CHECK-LABEL: vfabs_vv_v8f16:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    vsetvli zero, a0, e16, m1, ta, mu
+; CHECK-NEXT:    vfabs.v v8, v8, v0.t
+; CHECK-NEXT:    ret
+  %v = call <8 x half> @llvm.vp.fabs.v8f16(<8 x half> %va, <8 x i1> %m, i32 %evl)
+  ret <8 x half> %v
+}
+
+define <8 x half> @vfabs_vv_v8f16_unmasked(<8 x half> %va, i32 zeroext %evl) {
+; CHECK-LABEL: vfabs_vv_v8f16_unmasked:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    vsetvli zero, a0, e16, m1, ta, mu
+; CHECK-NEXT:    vfabs.v v8, v8
+; CHECK-NEXT:    ret
+  %head = insertelement <8 x i1> poison, i1 true, i32 0
+  %m = shufflevector <8 x i1> %head, <8 x i1> poison, <8 x i32> zeroinitializer
+  %v = call <8 x half> @llvm.vp.fabs.v8f16(<8 x half> %va, <8 x i1> %m, i32 %evl)
+  ret <8 x half> %v
+}
+
+declare <16 x half> @llvm.vp.fabs.v16f16(<16 x half>, <16 x i1>, i32)
+
+define <16 x half> @vfabs_vv_v16f16(<16 x half> %va, <16 x i1> %m, i32 zeroext %evl) {
+; CHECK-LABEL: vfabs_vv_v16f16:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    vsetvli zero, a0, e16, m2, ta, mu
+; CHECK-NEXT:    vfabs.v v8, v8, v0.t
+; CHECK-NEXT:    ret
+  %v = call <16 x half> @llvm.vp.fabs.v16f16(<16 x half> %va, <16 x i1> %m, i32 %evl)
+  ret <16 x half> %v
+}
+
+define <16 x half> @vfabs_vv_v16f16_unmasked(<16 x half> %va, i32 zeroext %evl) {
+; CHECK-LABEL: vfabs_vv_v16f16_unmasked:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    vsetvli zero, a0, e16, m2, ta, mu
+; CHECK-NEXT:    vfabs.v v8, v8
+; CHECK-NEXT:    ret
+  %head = insertelement <16 x i1> poison, i1 true, i32 0
+  %m = shufflevector <16 x i1> %head, <16 x i1> poison, <16 x i32> zeroinitializer
+  %v = call <16 x half> @llvm.vp.fabs.v16f16(<16 x half> %va, <16 x i1> %m, i32 %evl)
+  ret <16 x half> %v
+}
+
+declare <2 x float> @llvm.vp.fabs.v2f32(<2 x float>, <2 x i1>, i32)
+
+define <2 x float> @vfabs_vv_v2f32(<2 x float> %va, <2 x i1> %m, i32 zeroext %evl) {
+; CHECK-LABEL: vfabs_vv_v2f32:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    vsetvli zero, a0, e32, mf2, ta, mu
+; CHECK-NEXT:    vfabs.v v8, v8, v0.t
+; CHECK-NEXT:    ret
+  %v = call <2 x float> @llvm.vp.fabs.v2f32(<2 x float> %va, <2 x i1> %m, i32 %evl)
+  ret <2 x float> %v
+}
+
+define <2 x float> @vfabs_vv_v2f32_unmasked(<2 x float> %va, i32 zeroext %evl) {
+; CHECK-LABEL: vfabs_vv_v2f32_unmasked:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    vsetvli zero, a0, e32, mf2, ta, mu
+; CHECK-NEXT:    vfabs.v v8, v8
+; CHECK-NEXT:    ret
+  %head = insertelement <2 x i1> poison, i1 true, i32 0
+  %m = shufflevector <2 x i1> %head, <2 x i1> poison, <2 x i32> zeroinitializer
+  %v = call <2 x float> @llvm.vp.fabs.v2f32(<2 x float> %va, <2 x i1> %m, i32 %evl)
+  ret <2 x float> %v
+}
+
+declare <4 x float> @llvm.vp.fabs.v4f32(<4 x float>, <4 x i1>, i32)
+
+define <4 x float> @vfabs_vv_v4f32(<4 x float> %va, <4 x i1> %m, i32 zeroext %evl) {
+; CHECK-LABEL: vfabs_vv_v4f32:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    vsetvli zero, a0, e32, m1, ta, mu
+; CHECK-NEXT:    vfabs.v v8, v8, v0.t
+; CHECK-NEXT:    ret
+  %v = call <4 x float> @llvm.vp.fabs.v4f32(<4 x float> %va, <4 x i1> %m, i32 %evl)
+  ret <4 x float> %v
+}
+
+define <4 x float> @vfabs_vv_v4f32_unmasked(<4 x float> %va, i32 zeroext %evl) {
+; CHECK-LABEL: vfabs_vv_v4f32_unmasked:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    vsetvli zero, a0, e32, m1, ta, mu
+; CHECK-NEXT:    vfabs.v v8, v8
+; CHECK-NEXT:    ret
+  %head = insertelement <4 x i1> poison, i1 true, i32 0
+  %m = shufflevector <4 x i1> %head, <4 x i1> poison, <4 x i32> zeroinitializer
+  %v = call <4 x float> @llvm.vp.fabs.v4f32(<4 x float> %va, <4 x i1> %m, i32 %evl)
+  ret <4 x float> %v
+}
+
+declare <8 x float> @llvm.vp.fabs.v8f32(<8 x float>, <8 x i1>, i32)
+
+define <8 x float> @vfabs_vv_v8f32(<8 x float> %va, <8 x i1> %m, i32 zeroext %evl) {
+; CHECK-LABEL: vfabs_vv_v8f32:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    vsetvli zero, a0, e32, m2, ta, mu
+; CHECK-NEXT:    vfabs.v v8, v8, v0.t
+; CHECK-NEXT:    ret
+  %v = call <8 x float> @llvm.vp.fabs.v8f32(<8 x float> %va, <8 x i1> %m, i32 %evl)
+  ret <8 x float> %v
+}
+
+define <8 x float> @vfabs_vv_v8f32_unmasked(<8 x float> %va, i32 zeroext %evl) {
+; CHECK-LABEL: vfabs_vv_v8f32_unmasked:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    vsetvli zero, a0, e32, m2, ta, mu
+; CHECK-NEXT:    vfabs.v v8, v8
+; CHECK-NEXT:    ret
+  %head = insertelement <8 x i1> poison, i1 true, i32 0
+  %m = shufflevector <8 x i1> %head, <8 x i1> poison, <8 x i32> zeroinitializer
+  %v = call <8 x float> @llvm.vp.fabs.v8f32(<8 x float> %va, <8 x i1> %m, i32 %evl)
+  ret <8 x float> %v
+}
+
+declare <16 x float> @llvm.vp.fabs.v16f32(<16 x float>, <16 x i1>, i32)
+
+define <16 x float> @vfabs_vv_v16f32(<16 x float> %va, <16 x i1> %m, i32 zeroext %evl) {
+; CHECK-LABEL: vfabs_vv_v16f32:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    vsetvli zero, a0, e32, m4, ta, mu
+; CHECK-NEXT:    vfabs.v v8, v8, v0.t
+; CHECK-NEXT:    ret
+  %v = call <16 x float> @llvm.vp.fabs.v16f32(<16 x float> %va, <16 x i1> %m, i32 %evl)
+  ret <16 x float> %v
+}
+
+define <16 x float> @vfabs_vv_v16f32_unmasked(<16 x float> %va, i32 zeroext %evl) {
+; CHECK-LABEL: vfabs_vv_v16f32_unmasked:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    vsetvli zero, a0, e32, m4, ta, mu
+; CHECK-NEXT:    vfabs.v v8, v8
+; CHECK-NEXT:    ret
+  %head = insertelement <16 x i1> poison, i1 true, i32 0
+  %m = shufflevector <16 x i1> %head, <16 x i1> poison, <16 x i32> zeroinitializer
+  %v = call <16 x float> @llvm.vp.fabs.v16f32(<16 x float> %va, <16 x i1> %m, i32 %evl)
+  ret <16 x float> %v
+}
+
+declare <2 x double> @llvm.vp.fabs.v2f64(<2 x double>, <2 x i1>, i32)
+
+define <2 x double> @vfabs_vv_v2f64(<2 x double> %va, <2 x i1> %m, i32 zeroext %evl) {
+; CHECK-LABEL: vfabs_vv_v2f64:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    vsetvli zero, a0, e64, m1, ta, mu
+; CHECK-NEXT:    vfabs.v v8, v8, v0.t
+; CHECK-NEXT:    ret
+  %v = call <2 x double> @llvm.vp.fabs.v2f64(<2 x double> %va, <2 x i1> %m, i32 %evl)
+  ret <2 x double> %v
+}
+
+define <2 x double> @vfabs_vv_v2f64_unmasked(<2 x double> %va, i32 zeroext %evl) {
+; CHECK-LABEL: vfabs_vv_v2f64_unmasked:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    vsetvli zero, a0, e64, m1, ta, mu
+; CHECK-NEXT:    vfabs.v v8, v8
+; CHECK-NEXT:    ret
+  %head = insertelement <2 x i1> poison, i1 true, i32 0
+  %m = shufflevector <2 x i1> %head, <2 x i1> poison, <2 x i32> zeroinitializer
+  %v = call <2 x double> @llvm.vp.fabs.v2f64(<2 x double> %va, <2 x i1> %m, i32 %evl)
+  ret <2 x double> %v
+}
+
+declare <4 x double> @llvm.vp.fabs.v4f64(<4 x double>, <4 x i1>, i32)
+
+define <4 x double> @vfabs_vv_v4f64(<4 x double> %va, <4 x i1> %m, i32 zeroext %evl) {
+; CHECK-LABEL: vfabs_vv_v4f64:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    vsetvli zero, a0, e64, m2, ta, mu
+; CHECK-NEXT:    vfabs.v v8, v8, v0.t
+; CHECK-NEXT:    ret
+  %v = call <4 x double> @llvm.vp.fabs.v4f64(<4 x double> %va, <4 x i1> %m, i32 %evl)
+  ret <4 x double> %v
+}
+
+define <4 x double> @vfabs_vv_v4f64_unmasked(<4 x double> %va, i32 zeroext %evl) {
+; CHECK-LABEL: vfabs_vv_v4f64_unmasked:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    vsetvli zero, a0, e64, m2, ta, mu
+; CHECK-NEXT:    vfabs.v v8, v8
+; CHECK-NEXT:    ret
+  %head = insertelement <4 x i1> poison, i1 true, i32 0
+  %m = shufflevector <4 x i1> %head, <4 x i1> poison, <4 x i32> zeroinitializer
+  %v = call <4 x double> @llvm.vp.fabs.v4f64(<4 x double> %va, <4 x i1> %m, i32 %evl)
+  ret <4 x double> %v
+}
+
+declare <8 x double> @llvm.vp.fabs.v8f64(<8 x double>, <8 x i1>, i32)
+
+define <8 x double> @vfabs_vv_v8f64(<8 x double> %va, <8 x i1> %m, i32 zeroext %evl) {
+; CHECK-LABEL: vfabs_vv_v8f64:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    vsetvli zero, a0, e64, m4, ta, mu
+; CHECK-NEXT:    vfabs.v v8, v8, v0.t
+; CHECK-NEXT:    ret
+  %v = call <8 x double> @llvm.vp.fabs.v8f64(<8 x double> %va, <8 x i1> %m, i32 %evl)
+  ret <8 x double> %v
+}
+
+define <8 x double> @vfabs_vv_v8f64_unmasked(<8 x double> %va, i32 zeroext %evl) {
+; CHECK-LABEL: vfabs_vv_v8f64_unmasked:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    vsetvli zero, a0, e64, m4, ta, mu
+; CHECK-NEXT:    vfabs.v v8, v8
+; CHECK-NEXT:    ret
+  %head = insertelement <8 x i1> poison, i1 true, i32 0
+  %m = shufflevector <8 x i1> %head, <8 x i1> poison, <8 x i32> zeroinitializer
+  %v = call <8 x double> @llvm.vp.fabs.v8f64(<8 x double> %va, <8 x i1> %m, i32 %evl)
+  ret <8 x double> %v
+}
+
+declare <15 x double> @llvm.vp.fabs.v15f64(<15 x double>, <15 x i1>, i32)
+
+define <15 x double> @vfabs_vv_v15f64(<15 x double> %va, <15 x i1> %m, i32 zeroext %evl) {
+; CHECK-LABEL: vfabs_vv_v15f64:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    vsetvli zero, a0, e64, m8, ta, mu
+; CHECK-NEXT:    vfabs.v v8, v8, v0.t
+; CHECK-NEXT:    ret
+  %v = call <15 x double> @llvm.vp.fabs.v15f64(<15 x double> %va, <15 x i1> %m, i32 %evl)
+  ret <15 x double> %v
+}
+
+define <15 x double> @vfabs_vv_v15f64_unmasked(<15 x double> %va, i32 zeroext %evl) {
+; CHECK-LABEL: vfabs_vv_v15f64_unmasked:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    vsetvli zero, a0, e64, m8, ta, mu
+; CHECK-NEXT:    vfabs.v v8, v8
+; CHECK-NEXT:    ret
+  %head = insertelement <15 x i1> poison, i1 true, i32 0
+  %m = shufflevector <15 x i1> %head, <15 x i1> poison, <15 x i32> zeroinitializer
+  %v = call <15 x double> @llvm.vp.fabs.v15f64(<15 x double> %va, <15 x i1> %m, i32 %evl)
+  ret <15 x double> %v
+}
+
+declare <16 x double> @llvm.vp.fabs.v16f64(<16 x double>, <16 x i1>, i32)
+
+define <16 x double> @vfabs_vv_v16f64(<16 x double> %va, <16 x i1> %m, i32 zeroext %evl) {
+; CHECK-LABEL: vfabs_vv_v16f64:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    vsetvli zero, a0, e64, m8, ta, mu
+; CHECK-NEXT:    vfabs.v v8, v8, v0.t
+; CHECK-NEXT:    ret
+  %v = call <16 x double> @llvm.vp.fabs.v16f64(<16 x double> %va, <16 x i1> %m, i32 %evl)
+  ret <16 x double> %v
+}
+
+define <16 x double> @vfabs_vv_v16f64_unmasked(<16 x double> %va, i32 zeroext %evl) {
+; CHECK-LABEL: vfabs_vv_v16f64_unmasked:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    vsetvli zero, a0, e64, m8, ta, mu
+; CHECK-NEXT:    vfabs.v v8, v8
+; CHECK-NEXT:    ret
+  %head = insertelement <16 x i1> poison, i1 true, i32 0
+  %m = shufflevector <16 x i1> %head, <16 x i1> poison, <16 x i32> zeroinitializer
+  %v = call <16 x double> @llvm.vp.fabs.v16f64(<16 x double> %va, <16 x i1> %m, i32 %evl)
+  ret <16 x double> %v
+}
+
+declare <32 x double> @llvm.vp.fabs.v32f64(<32 x double>, <32 x i1>, i32)
+
+define <32 x double> @vfabs_vv_v32f64(<32 x double> %va, <32 x i1> %m, i32 zeroext %evl) {
+; CHECK-LABEL: vfabs_vv_v32f64:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    vmv1r.v v24, v0
+; CHECK-NEXT:    li a1, 0
+; CHECK-NEXT:    vsetivli zero, 2, e8, mf4, ta, mu
+; CHECK-NEXT:    addi a2, a0, -16
+; CHECK-NEXT:    vslidedown.vi v0, v0, 2
+; CHECK-NEXT:    bltu a0, a2, .LBB26_2
+; CHECK-NEXT:  # %bb.1:
+; CHECK-NEXT:    mv a1, a2
+; CHECK-NEXT:  .LBB26_2:
+; CHECK-NEXT:    vsetvli zero, a1, e64, m8, ta, mu
+; CHECK-NEXT:    li a1, 16
+; CHECK-NEXT:    vfabs.v v16, v16, v0.t
+; CHECK-NEXT:    bltu a0, a1, .LBB26_4
+; CHECK-NEXT:  # %bb.3:
+; CHECK-NEXT:    li a0, 16
+; CHECK-NEXT:  .LBB26_4:
+; CHECK-NEXT:    vsetvli zero, a0, e64, m8, ta, mu
+; CHECK-NEXT:    vmv1r.v v0, v24
+; CHECK-NEXT:    vfabs.v v8, v8, v0.t
+; CHECK-NEXT:    ret
+  %v = call <32 x double> @llvm.vp.fabs.v32f64(<32 x double> %va, <32 x i1> %m, i32 %evl)
+  ret <32 x double> %v
+}
+
+define <32 x double> @vfabs_vv_v32f64_unmasked(<32 x double> %va, i32 zeroext %evl) {
+; CHECK-LABEL: vfabs_vv_v32f64_unmasked:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    addi a1, a0, -16
+; CHECK-NEXT:    li a2, 0
+; CHECK-NEXT:    bltu a0, a1, .LBB27_2
+; CHECK-NEXT:  # %bb.1:
+; CHECK-NEXT:    mv a2, a1
+; CHECK-NEXT:  .LBB27_2:
+; CHECK-NEXT:    vsetvli zero, a2, e64, m8, ta, mu
+; CHECK-NEXT:    li a1, 16
+; CHECK-NEXT:    vfabs.v v16, v16
+; CHECK-NEXT:    bltu a0, a1, .LBB27_4
+; CHECK-NEXT:  # %bb.3:
+; CHECK-NEXT:    li a0, 16
+; CHECK-NEXT:  .LBB27_4:
+; CHECK-NEXT:    vsetvli zero, a0, e64, m8, ta, mu
+; CHECK-NEXT:    vfabs.v v8, v8
+; CHECK-NEXT:    ret
+  %head = insertelement <32 x i1> poison, i1 true, i32 0
+  %m = shufflevector <32 x i1> %head, <32 x i1> poison, <32 x i32> zeroinitializer
+  %v = call <32 x double> @llvm.vp.fabs.v32f64(<32 x double> %va, <32 x i1> %m, i32 %evl)
+  ret <32 x double> %v
+}

llvm/test/CodeGen/RISCV/rvv/vfabs-vp.ll

+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+; RUN: llc -mtriple=riscv32 -mattr=+d,+zfh,+experimental-zvfh,+v -target-abi=ilp32d \
+; RUN:     -verify-machineinstrs < %s | FileCheck %s
+; RUN: llc -mtriple=riscv64 -mattr=+d,+zfh,+experimental-zvfh,+v -target-abi=lp64d \
+; RUN:     -verify-machineinstrs < %s | FileCheck %s
+
+declare <vscale x 1 x half> @llvm.vp.fabs.nxv1f16(<vscale x 1 x half>, <vscale x 1 x i1>, i32)
+
+define <vscale x 1 x half> @vfabs_vv_nxv1f16(<vscale x 1 x half> %va, <vscale x 1 x i1> %m, i32 zeroext %evl) {
+; CHECK-LABEL: vfabs_vv_nxv1f16:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    vsetvli zero, a0, e16, mf4, ta, mu
+; CHECK-NEXT:    vfabs.v v8, v8, v0.t
+; CHECK-NEXT:    ret
+  %v = call <vscale x 1 x half> @llvm.vp.fabs.nxv1f16(<vscale x 1 x half> %va, <vscale x 1 x i1> %m, i32 %evl)
+  ret <vscale x 1 x half> %v
+}
+
+define <vscale x 1 x half> @vfabs_vv_nxv1f16_unmasked(<vscale x 1 x half> %va, i32 zeroext %evl) {
+; CHECK-LABEL: vfabs_vv_nxv1f16_unmasked:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    vsetvli zero, a0, e16, mf4, ta, mu
+; CHECK-NEXT:    vfabs.v v8, v8
+; CHECK-NEXT:    ret
+  %head = insertelement <vscale x 1 x i1> poison, i1 true, i32 0
+  %m = shufflevector <vscale x 1 x i1> %head, <vscale x 1 x i1> poison, <vscale x 1 x i32> zeroinitializer
+  %v = call <vscale x 1 x half> @llvm.vp.fabs.nxv1f16(<vscale x 1 x half> %va, <vscale x 1 x i1> %m, i32 %evl)
+  ret <vscale x 1 x half> %v
+}
+
+declare <vscale x 2 x half> @llvm.vp.fabs.nxv2f16(<vscale x 2 x half>, <vscale x 2 x i1>, i32)
+
+define <vscale x 2 x half> @vfabs_vv_nxv2f16(<vscale x 2 x half> %va, <vscale x 2 x i1> %m, i32 zeroext %evl) {
+; CHECK-LABEL: vfabs_vv_nxv2f16:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    vsetvli zero, a0, e16, mf2, ta, mu
+; CHECK-NEXT:    vfabs.v v8, v8, v0.t
+; CHECK-NEXT:    ret
+  %v = call <vscale x 2 x half> @llvm.vp.fabs.nxv2f16(<vscale x 2 x half> %va, <vscale x 2 x i1> %m, i32 %evl)
+  ret <vscale x 2 x half> %v
+}
+
+define <vscale x 2 x half> @vfabs_vv_nxv2f16_unmasked(<vscale x 2 x half> %va, i32 zeroext %evl) {
+; CHECK-LABEL: vfabs_vv_nxv2f16_unmasked:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    vsetvli zero, a0, e16, mf2, ta, mu
+; CHECK-NEXT:    vfabs.v v8, v8
+; CHECK-NEXT:    ret
+  %head = insertelement <vscale x 2 x i1> poison, i1 true, i32 0
+  %m = shufflevector <vscale x 2 x i1> %head, <vscale x 2 x i1> poison, <vscale x 2 x i32> zeroinitializer
+  %v = call <vscale x 2 x half> @llvm.vp.fabs.nxv2f16(<vscale x 2 x half> %va, <vscale x 2 x i1> %m, i32 %evl)
+  ret <vscale x 2 x half> %v
+}
+
+declare <vscale x 4 x half> @llvm.vp.fabs.nxv4f16(<vscale x 4 x half>, <vscale x 4 x i1>, i32)
+
+define <vscale x 4 x half> @vfabs_vv_nxv4f16(<vscale x 4 x half> %va, <vscale x 4 x i1> %m, i32 zeroext %evl) {
+; CHECK-LABEL: vfabs_vv_nxv4f16:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    vsetvli zero, a0, e16, m1, ta, mu
+; CHECK-NEXT:    vfabs.v v8, v8, v0.t
+; CHECK-NEXT:    ret
+  %v = call <vscale x 4 x half> @llvm.vp.fabs.nxv4f16(<vscale x 4 x half> %va, <vscale x 4 x i1> %m, i32 %evl)
+  ret <vscale x 4 x half> %v
+}
+
+define <vscale x 4 x half> @vfabs_vv_nxv4f16_unmasked(<vscale x 4 x half> %va, i32 zeroext %evl) {
+; CHECK-LABEL: vfabs_vv_nxv4f16_unmasked:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    vsetvli zero, a0, e16, m1, ta, mu
+; CHECK-NEXT:    vfabs.v v8, v8
+; CHECK-NEXT:    ret
+  %head = insertelement <vscale x 4 x i1> poison, i1 true, i32 0
+  %m = shufflevector <vscale x 4 x i1> %head, <vscale x 4 x i1> poison, <vscale x 4 x i32> zeroinitializer
+  %v = call <vscale x 4 x half> @llvm.vp.fabs.nxv4f16(<vscale x 4 x half> %va, <vscale x 4 x i1> %m, i32 %evl)
+  ret <vscale x 4 x half> %v
+}
+
+declare <vscale x 8 x half> @llvm.vp.fabs.nxv8f16(<vscale x 8 x half>, <vscale x 8 x i1>, i32)
+
+define <vscale x 8 x half> @vfabs_vv_nxv8f16(<vscale x 8 x half> %va, <vscale x 8 x i1> %m, i32 zeroext %evl) {
+; CHECK-LABEL: vfabs_vv_nxv8f16:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    vsetvli zero, a0, e16, m2, ta, mu
+; CHECK-NEXT:    vfabs.v v8, v8, v0.t
+; CHECK-NEXT:    ret
+  %v = call <vscale x 8 x half> @llvm.vp.fabs.nxv8f16(<vscale x 8 x half> %va, <vscale x 8 x i1> %m, i32 %evl)
+  ret <vscale x 8 x half> %v
+}
+
+define <vscale x 8 x half> @vfabs_vv_nxv8f16_unmasked(<vscale x 8 x half> %va, i32 zeroext %evl) {
+; CHECK-LABEL: vfabs_vv_nxv8f16_unmasked:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    vsetvli zero, a0, e16, m2, ta, mu
+; CHECK-NEXT:    vfabs.v v8, v8
+; CHECK-NEXT:    ret
+  %head = insertelement <vscale x 8 x i1> poison, i1 true, i32 0
+  %m = shufflevector <vscale x 8 x i1> %head, <vscale x 8 x i1> poison, <vscale x 8 x i32> zeroinitializer
+  %v = call <vscale x 8 x half> @llvm.vp.fabs.nxv8f16(<vscale x 8 x half> %va, <vscale x 8 x i1> %m, i32 %evl)
+  ret <vscale x 8 x half> %v
+}
+
+declare <vscale x 16 x half> @llvm.vp.fabs.nxv16f16(<vscale x 16 x half>, <vscale x 16 x i1>, i32)
+
+define <vscale x 16 x half> @vfabs_vv_nxv16f16(<vscale x 16 x half> %va, <vscale x 16 x i1> %m, i32 zeroext %evl) {
+; CHECK-LABEL: vfabs_vv_nxv16f16:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    vsetvli zero, a0, e16, m4, ta, mu
+; CHECK-NEXT:    vfabs.v v8, v8, v0.t
+; CHECK-NEXT:    ret
+  %v = call <vscale x 16 x half> @llvm.vp.fabs.nxv16f16(<vscale x 16 x half> %va, <vscale x 16 x i1> %m, i32 %evl)
+  ret <vscale x 16 x half> %v
+}
+
+define <vscale x 16 x half> @vfabs_vv_nxv16f16_unmasked(<vscale x 16 x half> %va, i32 zeroext %evl) {
+; CHECK-LABEL: vfabs_vv_nxv16f16_unmasked:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    vsetvli zero, a0, e16, m4, ta, mu
+; CHECK-NEXT:    vfabs.v v8, v8
+; CHECK-NEXT:    ret
+  %head = insertelement <vscale x 16 x i1> poison, i1 true, i32 0
+  %m = shufflevector <vscale x 16 x i1> %head, <vscale x 16 x i1> poison, <vscale x 16 x i32> zeroinitializer
+  %v = call <vscale x 16 x half> @llvm.vp.fabs.nxv16f16(<vscale x 16 x half> %va, <vscale x 16 x i1> %m, i32 %evl)
+  ret <vscale x 16 x half> %v
+}
+
+declare <vscale x 32 x half> @llvm.vp.fabs.nxv32f16(<vscale x 32 x half>, <vscale x 32 x i1>, i32)
+
+define <vscale x 32 x half> @vfabs_vv_nxv32f16(<vscale x 32 x half> %va, <vscale x 32 x i1> %m, i32 zeroext %evl) {
+; CHECK-LABEL: vfabs_vv_nxv32f16:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    vsetvli zero, a0, e16, m8, ta, mu
+; CHECK-NEXT:    vfabs.v v8, v8, v0.t
+; CHECK-NEXT:    ret
+  %v = call <vscale x 32 x half> @llvm.vp.fabs.nxv32f16(<vscale x 32 x half> %va, <vscale x 32 x i1> %m, i32 %evl)
+  ret <vscale x 32 x half> %v
+}
+
+define <vscale x 32 x half> @vfabs_vv_nxv32f16_unmasked(<vscale x 32 x half> %va, i32 zeroext %evl) {
+; CHECK-LABEL: vfabs_vv_nxv32f16_unmasked:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    vsetvli zero, a0, e16, m8, ta, mu
+; CHECK-NEXT:    vfabs.v v8, v8
+; CHECK-NEXT:    ret
+  %head = insertelement <vscale x 32 x i1> poison, i1 true, i32 0
+  %m = shufflevector <vscale x 32 x i1> %head, <vscale x 32 x i1> poison, <vscale x 32 x i32> zeroinitializer
+  %v = call <vscale x 32 x half> @llvm.vp.fabs.nxv32f16(<vscale x 32 x half> %va, <vscale x 32 x i1> %m, i32 %evl)
+  ret <vscale x 32 x half> %v
+}
+
+declare <vscale x 1 x float> @llvm.vp.fabs.nxv1f32(<vscale x 1 x float>, <vscale x 1 x i1>, i32)
+
+define <vscale x 1 x float> @vfabs_vv_nxv1f32(<vscale x 1 x float> %va, <vscale x 1 x i1> %m, i32 zeroext %evl) {
+; CHECK-LABEL: vfabs_vv_nxv1f32:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    vsetvli zero, a0, e32, mf2, ta, mu
+; CHECK-NEXT:    vfabs.v v8, v8, v0.t
+; CHECK-NEXT:    ret
+  %v = call <vscale x 1 x float> @llvm.vp.fabs.nxv1f32(<vscale x 1 x float> %va, <vscale x 1 x i1> %m, i32 %evl)
+  ret <vscale x 1 x float> %v
+}
+
+define <vscale x 1 x float> @vfabs_vv_nxv1f32_unmasked(<vscale x 1 x float> %va, i32 zeroext %evl) {
+; CHECK-LABEL: vfabs_vv_nxv1f32_unmasked:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    vsetvli zero, a0, e32, mf2, ta, mu
+; CHECK-NEXT:    vfabs.v v8, v8
+; CHECK-NEXT:    ret
+  %head = insertelement <vscale x 1 x i1> poison, i1 true, i32 0
+  %m = shufflevector <vscale x 1 x i1> %head, <vscale x 1 x i1> poison, <vscale x 1 x i32> zeroinitializer
+  %v = call <vscale x 1 x float> @llvm.vp.fabs.nxv1f32(<vscale x 1 x float> %va, <vscale x 1 x i1> %m, i32 %evl)
+  ret <vscale x 1 x float> %v
+}
+
+declare <vscale x 2 x float> @llvm.vp.fabs.nxv2f32(<vscale x 2 x float>, <vscale x 2 x i1>, i32)
+
+define <vscale x 2 x float> @vfabs_vv_nxv2f32(<vscale x 2 x float> %va, <vscale x 2 x i1> %m, i32 zeroext %evl) {
+; CHECK-LABEL: vfabs_vv_nxv2f32:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    vsetvli zero, a0, e32, m1, ta, mu
+; CHECK-NEXT:    vfabs.v v8, v8, v0.t
+; CHECK-NEXT:    ret
+  %v = call <vscale x 2 x float> @llvm.vp.fabs.nxv2f32(<vscale x 2 x float> %va, <vscale x 2 x i1> %m, i32 %evl)
+  ret <vscale x 2 x float> %v
+}
+
+define <vscale x 2 x float> @vfabs_vv_nxv2f32_unmasked(<vscale x 2 x float> %va, i32 zeroext %evl) {
+; CHECK-LABEL: vfabs_vv_nxv2f32_unmasked:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    vsetvli zero, a0, e32, m1, ta, mu
+; CHECK-NEXT:    vfabs.v v8, v8
+; CHECK-NEXT:    ret
+  %head = insertelement <vscale x 2 x i1> poison, i1 true, i32 0
+  %m = shufflevector <vscale x 2 x i1> %head, <vscale x 2 x i1> poison, <vscale x 2 x i32> zeroinitializer
+  %v = call <vscale x 2 x float> @llvm.vp.fabs.nxv2f32(<vscale x 2 x float> %va, <vscale x 2 x i1> %m, i32 %evl)
+  ret <vscale x 2 x float> %v
+}
+
+declare <vscale x 4 x float> @llvm.vp.fabs.nxv4f32(<vscale x 4 x float>, <vscale x 4 x i1>, i32)
+
+define <vscale x 4 x float> @vfabs_vv_nxv4f32(<vscale x 4 x float> %va, <vscale x 4 x i1> %m, i32 zeroext %evl) {
+; CHECK-LABEL: vfabs_vv_nxv4f32:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    vsetvli zero, a0, e32, m2, ta, mu
+; CHECK-NEXT:    vfabs.v v8, v8, v0.t
+; CHECK-NEXT:    ret
+  %v = call <vscale x 4 x float> @llvm.vp.fabs.nxv4f32(<vscale x 4 x float> %va, <vscale x 4 x i1> %m, i32 %evl)
+  ret <vscale x 4 x float> %v
+}
+
+define <vscale x 4 x float> @vfabs_vv_nxv4f32_unmasked(<vscale x 4 x float> %va, i32 zeroext %evl) {
+; CHECK-LABEL: vfabs_vv_nxv4f32_unmasked:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    vsetvli zero, a0, e32, m2, ta, mu
+; CHECK-NEXT:    vfabs.v v8, v8
+; CHECK-NEXT:    ret
+  %head = insertelement <vscale x 4 x i1> poison, i1 true, i32 0
+  %m = shufflevector <vscale x 4 x i1> %head, <vscale x 4 x i1> poison, <vscale x 4 x i32> zeroinitializer
+  %v = call <vscale x 4 x float> @llvm.vp.fabs.nxv4f32(<vscale x 4 x float> %va, <vscale x 4 x i1> %m, i32 %evl)
+  ret <vscale x 4 x float> %v
+}
+
+declare <vscale x 8 x float> @llvm.vp.fabs.nxv8f32(<vscale x 8 x float>, <vscale x 8 x i1>, i32)
+
+define <vscale x 8 x float> @vfabs_vv_nxv8f32(<vscale x 8 x float> %va, <vscale x 8 x i1> %m, i32 zeroext %evl) {
+; CHECK-LABEL: vfabs_vv_nxv8f32:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    vsetvli zero, a0, e32, m4, ta, mu
+; CHECK-NEXT:    vfabs.v v8, v8, v0.t
+; CHECK-NEXT:    ret
+  %v = call <vscale x 8 x float> @llvm.vp.fabs.nxv8f32(<vscale x 8 x float> %va, <vscale x 8 x i1> %m, i32 %evl)
+  ret <vscale x 8 x float> %v
+}
+
+define <vscale x 8 x float> @vfabs_vv_nxv8f32_unmasked(<vscale x 8 x float> %va, i32 zeroext %evl) {
+; CHECK-LABEL: vfabs_vv_nxv8f32_unmasked:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    vsetvli zero, a0, e32, m4, ta, mu
+; CHECK-NEXT:    vfabs.v v8, v8
+; CHECK-NEXT:    ret
+  %head = insertelement <vscale x 8 x i1> poison, i1 true, i32 0
+  %m = shufflevector <vscale x 8 x i1> %head, <vscale x 8 x i1> poison, <vscale x 8 x i32> zeroinitializer
+  %v = call <vscale x 8 x float> @llvm.vp.fabs.nxv8f32(<vscale x 8 x float> %va, <vscale x 8 x i1> %m, i32 %evl)
+  ret <vscale x 8 x float> %v
+}
+
+declare <vscale x 16 x float> @llvm.vp.fabs.nxv16f32(<vscale x 16 x float>, <vscale x 16 x i1>, i32)
+
+define <vscale x 16 x float> @vfabs_vv_nxv16f32(<vscale x 16 x float> %va, <vscale x 16 x i1> %m, i32 zeroext %evl) {
+; CHECK-LABEL: vfabs_vv_nxv16f32:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    vsetvli zero, a0, e32, m8, ta, mu
+; CHECK-NEXT:    vfabs.v v8, v8, v0.t
+; CHECK-NEXT:    ret
+  %v = call <vscale x 16 x float> @llvm.vp.fabs.nxv16f32(<vscale x 16 x float> %va, <vscale x 16 x i1> %m, i32 %evl)
+  ret <vscale x 16 x float> %v
+}
+
+define <vscale x 16 x float> @vfabs_vv_nxv16f32_unmasked(<vscale x 16 x float> %va, i32 zeroext %evl) {
+; CHECK-LABEL: vfabs_vv_nxv16f32_unmasked:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    vsetvli zero, a0, e32, m8, ta, mu
+; CHECK-NEXT:    vfabs.v v8, v8
+; CHECK-NEXT:    ret
+  %head = insertelement <vscale x 16 x i1> poison, i1 true, i32 0
+  %m = shufflevector <vscale x 16 x i1> %head, <vscale x 16 x i1> poison, <vscale x 16 x i32> zeroinitializer
+  %v = call <vscale x 16 x float> @llvm.vp.fabs.nxv16f32(<vscale x 16 x float> %va, <vscale x 16 x i1> %m, i32 %evl)
+  ret <vscale x 16 x float> %v
+}
+
+declare <vscale x 1 x double> @llvm.vp.fabs.nxv1f64(<vscale x 1 x double>, <vscale x 1 x i1>, i32)
+
+define <vscale x 1 x double> @vfabs_vv_nxv1f64(<vscale x 1 x double> %va, <vscale x 1 x i1> %m, i32 zeroext %evl) {
+; CHECK-LABEL: vfabs_vv_nxv1f64:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    vsetvli zero, a0, e64, m1, ta, mu
+; CHECK-NEXT:    vfabs.v v8, v8, v0.t
+; CHECK-NEXT:    ret
+  %v = call <vscale x 1 x double> @llvm.vp.fabs.nxv1f64(<vscale x 1 x double> %va, <vscale x 1 x i1> %m, i32 %evl)
+  ret <vscale x 1 x double> %v
+}
+
+define <vscale x 1 x double> @vfabs_vv_nxv1f64_unmasked(<vscale x 1 x double> %va, i32 zeroext %evl) {
+; CHECK-LABEL: vfabs_vv_nxv1f64_unmasked:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    vsetvli zero, a0, e64, m1, ta, mu
+; CHECK-NEXT:    vfabs.v v8, v8
+; CHECK-NEXT:    ret
+  %head = insertelement <vscale x 1 x i1> poison, i1 true, i32 0
+  %m = shufflevector <vscale x 1 x i1> %head, <vscale x 1 x i1> poison, <vscale x 1 x i32> zeroinitializer
+  %v = call <vscale x 1 x double> @llvm.vp.fabs.nxv1f64(<vscale x 1 x double> %va, <vscale x 1 x i1> %m, i32 %evl)
+  ret <vscale x 1 x double> %v
+}
+
+declare <vscale x 2 x double> @llvm.vp.fabs.nxv2f64(<vscale x 2 x double>, <vscale x 2 x i1>, i32)
+
+define <vscale x 2 x double> @vfabs_vv_nxv2f64(<vscale x 2 x double> %va, <vscale x 2 x i1> %m, i32 zeroext %evl) {
+; CHECK-LABEL: vfabs_vv_nxv2f64:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    vsetvli zero, a0, e64, m2, ta, mu
+; CHECK-NEXT:    vfabs.v v8, v8, v0.t
+; CHECK-NEXT:    ret
+  %v = call <vscale x 2 x double> @llvm.vp.fabs.nxv2f64(<vscale x 2 x double> %va, <vscale x 2 x i1> %m, i32 %evl)
+  ret <vscale x 2 x double> %v
+}
+
+define <vscale x 2 x double> @vfabs_vv_nxv2f64_unmasked(<vscale x 2 x double> %va, i32 zeroext %evl) {
+; CHECK-LABEL: vfabs_vv_nxv2f64_unmasked:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    vsetvli zero, a0, e64, m2, ta, mu
+; CHECK-NEXT:    vfabs.v v8, v8
+; CHECK-NEXT:    ret
+  %head = insertelement <vscale x 2 x i1> poison, i1 true, i32 0
+  %m = shufflevector <vscale x 2 x i1> %head, <vscale x 2 x i1> poison, <vscale x 2 x i32> zeroinitializer
+  %v = call <vscale x 2 x double> @llvm.vp.fabs.nxv2f64(<vscale x 2 x double> %va, <vscale x 2 x i1> %m, i32 %evl)
+  ret <vscale x 2 x double> %v
+}
+
+declare <vscale x 4 x double> @llvm.vp.fabs.nxv4f64(<vscale x 4 x double>, <vscale x 4 x i1>, i32)
+
+define <vscale x 4 x double> @vfabs_vv_nxv4f64(<vscale x 4 x double> %va, <vscale x 4 x i1> %m, i32 zeroext %evl) {
+; CHECK-LABEL: vfabs_vv_nxv4f64:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    vsetvli zero, a0, e64, m4, ta, mu
+; CHECK-NEXT:    vfabs.v v8, v8, v0.t
+; CHECK-NEXT:    ret
+  %v = call <vscale x 4 x double> @llvm.vp.fabs.nxv4f64(<vscale x 4 x double> %va, <vscale x 4 x i1> %m, i32 %evl)
+  ret <vscale x 4 x double> %v
+}
+
+define <vscale x 4 x double> @vfabs_vv_nxv4f64_unmasked(<vscale x 4 x double> %va, i32 zeroext %evl) {
+; CHECK-LABEL: vfabs_vv_nxv4f64_unmasked:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    vsetvli zero, a0, e64, m4, ta, mu
+; CHECK-NEXT:    vfabs.v v8, v8
+; CHECK-NEXT:    ret
+  %head = insertelement <vscale x 4 x i1> poison, i1 true, i32 0
+  %m = shufflevector <vscale x 4 x i1> %head, <vscale x 4 x i1> poison, <vscale x 4 x i32> zeroinitializer
+  %v = call <vscale x 4 x double> @llvm.vp.fabs.nxv4f64(<vscale x 4 x double> %va, <vscale x 4 x i1> %m, i32 %evl)
+  ret <vscale x 4 x double> %v
+}
+
+declare <vscale x 7 x double> @llvm.vp.fabs.nxv7f64(<vscale x 7 x double>, <vscale x 7 x i1>, i32)
+
+define <vscale x 7 x double> @vfabs_vv_nxv7f64(<vscale x 7 x double> %va, <vscale x 7 x i1> %m, i32 zeroext %evl) {
+; CHECK-LABEL: vfabs_vv_nxv7f64:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    vsetvli zero, a0, e64, m8, ta, mu
+; CHECK-NEXT:    vfabs.v v8, v8, v0.t
+; CHECK-NEXT:    ret
+  %v = call <vscale x 7 x double> @llvm.vp.fabs.nxv7f64(<vscale x 7 x double> %va, <vscale x 7 x i1> %m, i32 %evl)
+  ret <vscale x 7 x double> %v
+}
+
+define <vscale x 7 x double> @vfabs_vv_nxv7f64_unmasked(<vscale x 7 x double> %va, i32 zeroext %evl) {
+; CHECK-LABEL: vfabs_vv_nxv7f64_unmasked:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    vsetvli zero, a0, e64, m8, ta, mu
+; CHECK-NEXT:    vfabs.v v8, v8
+; CHECK-NEXT:    ret
+  %head = insertelement <vscale x 7 x i1> poison, i1 true, i32 0
+  %m = shufflevector <vscale x 7 x i1> %head, <vscale x 7 x i1> poison, <vscale x 7 x i32> zeroinitializer
+  %v = call <vscale x 7 x double> @llvm.vp.fabs.nxv7f64(<vscale x 7 x double> %va, <vscale x 7 x i1> %m, i32 %evl)
+  ret <vscale x 7 x double> %v
+}
+
+declare <vscale x 8 x double> @llvm.vp.fabs.nxv8f64(<vscale x 8 x double>, <vscale x 8 x i1>, i32)
+
+define <vscale x 8 x double> @vfabs_vv_nxv8f64(<vscale x 8 x double> %va, <vscale x 8 x i1> %m, i32 zeroext %evl) {
+; CHECK-LABEL: vfabs_vv_nxv8f64:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    vsetvli zero, a0, e64, m8, ta, mu
+; CHECK-NEXT:    vfabs.v v8, v8, v0.t
+; CHECK-NEXT:    ret
+  %v = call <vscale x 8 x double> @llvm.vp.fabs.nxv8f64(<vscale x 8 x double> %va, <vscale x 8 x i1> %m, i32 %evl)
+  ret <vscale x 8 x double> %v
+}
+
+define <vscale x 8 x double> @vfabs_vv_nxv8f64_unmasked(<vscale x 8 x double> %va, i32 zeroext %evl) {
+; CHECK-LABEL: vfabs_vv_nxv8f64_unmasked:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    vsetvli zero, a0, e64, m8, ta, mu
+; CHECK-NEXT:    vfabs.v v8, v8
+; CHECK-NEXT:    ret
+  %head = insertelement <vscale x 8 x i1> poison, i1 true, i32 0
+  %m = shufflevector <vscale x 8 x i1> %head, <vscale x 8 x i1> poison, <vscale x 8 x i32> zeroinitializer
+  %v = call <vscale x 8 x double> @llvm.vp.fabs.nxv8f64(<vscale x 8 x double> %va, <vscale x 8 x i1> %m, i32 %evl)
+  ret <vscale x 8 x double> %v
+}
+
+; Test splitting.
+declare <vscale x 16 x double> @llvm.vp.fabs.nxv16f64(<vscale x 16 x double>, <vscale x 16 x i1>, i32)
+
+define <vscale x 16 x double> @vfabs_vv_nxv16f64(<vscale x 16 x double> %va, <vscale x 16 x i1> %m, i32 zeroext %evl) {
+; CHECK-LABEL: vfabs_vv_nxv16f64:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    vmv1r.v v24, v0
+; CHECK-NEXT:    li a2, 0
+; CHECK-NEXT:    csrr a1, vlenb
+; CHECK-NEXT:    srli a4, a1, 3
+; CHECK-NEXT:    vsetvli a3, zero, e8, mf4, ta, mu
+; CHECK-NEXT:    sub a3, a0, a1
+; CHECK-NEXT:    vslidedown.vx v0, v0, a4
+; CHECK-NEXT:    bltu a0, a3, .LBB32_2
+; CHECK-NEXT:  # %bb.1:
+; CHECK-NEXT:    mv a2, a3
+; CHECK-NEXT:  .LBB32_2:
+; CHECK-NEXT:    vsetvli zero, a2, e64, m8, ta, mu
+; CHECK-NEXT:    vfabs.v v16, v16, v0.t
+; CHECK-NEXT:    bltu a0, a1, .LBB32_4
+; CHECK-NEXT:  # %bb.3:
+; CHECK-NEXT:    mv a0, a1
+; CHECK-NEXT:  .LBB32_4:
+; CHECK-NEXT:    vsetvli zero, a0, e64, m8, ta, mu
+; CHECK-NEXT:    vmv1r.v v0, v24
+; CHECK-NEXT:    vfabs.v v8, v8, v0.t
+; CHECK-NEXT:    ret
+  %v = call <vscale x 16 x double> @llvm.vp.fabs.nxv16f64(<vscale x 16 x double> %va, <vscale x 16 x i1> %m, i32 %evl)
+  ret <vscale x 16 x double> %v
+}
+
+define <vscale x 16 x double> @vfabs_vv_nxv16f64_unmasked(<vscale x 16 x double> %va, i32 zeroext %evl) {
+; CHECK-LABEL: vfabs_vv_nxv16f64_unmasked:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    csrr a1, vlenb
+; CHECK-NEXT:    mv a2, a0
+; CHECK-NEXT:    bltu a0, a1, .LBB33_2
+; CHECK-NEXT:  # %bb.1:
+; CHECK-NEXT:    mv a2, a1
+; CHECK-NEXT:  .LBB33_2:
+; CHECK-NEXT:    li a3, 0
+; CHECK-NEXT:    vsetvli zero, a2, e64, m8, ta, mu
+; CHECK-NEXT:    sub a1, a0, a1
+; CHECK-NEXT:    vfabs.v v8, v8
+; CHECK-NEXT:    bltu a0, a1, .LBB33_4
+; CHECK-NEXT:  # %bb.3:
+; CHECK-NEXT:    mv a3, a1
+; CHECK-NEXT:  .LBB33_4:
+; CHECK-NEXT:    vsetvli zero, a3, e64, m8, ta, mu
+; CHECK-NEXT:    vfabs.v v16, v16
+; CHECK-NEXT:    ret
+  %head = insertelement <vscale x 16 x i1> poison, i1 true, i32 0
+  %m = shufflevector <vscale x 16 x i1> %head, <vscale x 16 x i1> poison, <vscale x 16 x i32> zeroinitializer
+  %v = call <vscale x 16 x double> @llvm.vp.fabs.nxv16f64(<vscale x 16 x double> %va, <vscale x 16 x i1> %m, i32 %evl)
+  ret <vscale x 16 x double> %v
+}

llvm/unittests/IR/VPIntrinsicTest.cpp

std::unique_ptr<Module> createVPDeclarationModule() {
 
     const char *BinaryFPOpcodes[] = {"fadd", "fsub", "fmul", "fdiv", "frem"};
     for (const char *BinaryFPOpcode : BinaryFPOpcodes)
       Str << " declare <8 x float> @llvm.vp." << BinaryFPOpcode
           << ".v8f32(<8 x float>, <8 x float>, <8 x i1>, i32) ";
 
     Str << " declare <8 x float> @llvm.vp.fneg.v8f32(<8 x float>, <8 x i1>, "
            "i32)";
+    Str << " declare <8 x float> @llvm.vp.fabs.v8f32(<8 x float>, <8 x i1>, "
+           "i32)";
     Str << " declare <8 x float> @llvm.vp.fma.v8f32(<8 x float>, <8 x float>, "
            "<8 x float>, <8 x i1>, i32) ";
 
     Str << " declare void @llvm.vp.store.v8i32.p0v8i32(<8 x i32>, <8 x i32>*, "
            "<8 x i1>, i32) ";
     Str << "declare void "
            "@llvm.experimental.vp.strided.store.v8i32.i32(<8 x i32>, "
            "i32*, i32, <8 x i1>, i32) ";