[AMDGPU][GlobalISel] Transform (fsub (fneg (fmul, x, y)), z) -> (fma (fneg x), y, (fneg z))

[matejam]

Summary

Instead of sub and mul instructions, use v_mad, v_mac or v_fma if fma
instructions are faster and are legal for the given architecture.
Combiner for a case that has one multiplication, which gets negated, and
from that the third argument is subtracted. This combiner will transform
that into two negations and one fma/fmad instruction.

[matejam]

Put back the accidentally deleted combiner from the list of combiners (load_or_combine).

[matejam]

Minor changes in CombinerHelper.cpp and in the tests.

[matejam]

Use mi_match for comparing instructions instead of comparing the opcodes.

[matejam]

Rebased.

[matejam]

Use m_MInstr instead of m_Reg in matching patterns (mi_match).
Instead of getting MachineInstr's, get only the Register values (no need for MachineInstr in this case).
Formatting and refactoring.

[matejam]

Use applyBuildFn instead of writing my own apply.

[matejam]

Changes in tests.

[mbrkusanin]

LGTM

[matejam]

Added missing comments and an FMA combiner group in table gen.

llvm/include/llvm/CodeGen/GlobalISel/CombinerHelper.h

public:
   //            -> (fmad x, y, (fmad (fpext u), (fpext v), z))
   bool matchCombineFAddFpExtFMulToFMadOrFMAAggressive(MachineInstr &MI,
                                                       BuildFnTy &MatchInfo);
 
   /// Transform (fsub (fmul x, y), z) -> (fma x, y, -z)
   ///           (fsub (fmul x, y), z) -> (fmad x, y, -z)
   bool matchCombineFSubFMulToFMadOrFMA(MachineInstr &MI, BuildFnTy &MatchInfo);
 
+  /// Transform (fsub (fneg (fmul, x, y)), z) -> (fma (fneg x), y, (fneg z))
+  ///           (fsub (fneg (fmul, x, y)), z) -> (fmad (fneg x), y, (fneg z))
+  bool matchCombineFSubFNegFMulToFMadOrFMA(MachineInstr &MI,
+                                           BuildFnTy &MatchInfo);
+
 private:
   /// Given a non-indexed load or store instruction \p MI, find an offset that
   /// can be usefully and legally folded into it as a post-indexing operation.
   ///
   /// \returns true if a candidate is found.
   bool findPostIndexCandidate(MachineInstr &MI, Register &Addr, Register &Base,
                               Register &Offset);
 

llvm/include/llvm/Target/GlobalISel/Combine.td

 //                                 -> (fmad x, y, -z)
 def combine_fsub_fmul_to_fmad_or_fma: GICombineRule<
   (defs root:$root, build_fn_matchinfo:$info),
   (match (wip_match_opcode G_FSUB):$root,
          [{ return Helper.matchCombineFSubFMulToFMadOrFMA(*${root},
                                                           ${info}); }]),
   (apply [{ Helper.applyBuildFn(*${root}, ${info}); }])>;
 
+// Transform (fsub (fneg (fmul, x, y)), z) -> (fma (fneg x), y, (fneg z))
+//           (fsub x, (fneg (fmul, y, z))) -> (fma y, z, x)
+def combine_fsub_fneg_fmul_to_fmad_or_fma: GICombineRule<
+  (defs root:$root, build_fn_matchinfo:$info),
+  (match (wip_match_opcode G_FSUB):$root,
+         [{ return Helper.matchCombineFSubFNegFMulToFMadOrFMA(*${root},
+                                                              ${info}); }]),
+  (apply [{ Helper.applyBuildFn(*${root}, ${info}); }])>;
+
 // FIXME: These should use the custom predicate feature once it lands.
 def undef_combines : GICombineGroup<[undef_to_fp_zero, undef_to_int_zero,
                                      undef_to_negative_one,
                                      binop_left_undef_to_zero,
                                      propagate_undef_any_op,
                                      propagate_undef_all_ops,
                                      propagate_undef_shuffle_mask,
                                      erase_undef_store]>;

 
 def select_combines : GICombineGroup<[select_undef_cmp, select_constant_cmp]>;
 
 def trivial_combines : GICombineGroup<[copy_prop, mul_to_shl, add_p2i_to_ptradd,
                                        mul_by_neg_one]>;
 
 def fma_combines : GICombineGroup<[combine_fadd_fmul_to_fmad_or_fma,
   combine_fadd_fpext_fmul_to_fmad_or_fma, combine_fadd_fma_fmul_to_fmad_or_fma,
-  combine_fadd_fpext_fma_fmul_to_fmad_or_fma,
-  combine_fsub_fmul_to_fmad_or_fma]>;
+  combine_fadd_fpext_fma_fmul_to_fmad_or_fma, combine_fsub_fmul_to_fmad_or_fma,
+  combine_fsub_fneg_fmul_to_fmad_or_fma]>;
 
 def all_combines : GICombineGroup<[trivial_combines, insert_vec_elt_combines,
     extract_vec_elt_combines, combines_for_extload,
     combine_indexed_load_store, undef_combines, identity_combines, phi_combines,
     simplify_add_to_sub, hoist_logic_op_with_same_opcode_hands,
     reassocs, ptr_add_immed_chain,
     shl_ashr_to_sext_inreg, sext_inreg_of_load,
     width_reduction_combines, select_combines,

llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp

MatchInfo = [=, &MI](MachineIRBuilder &B) {
           {NegY, RHS->getOperand(2).getReg(), LHS->getOperand(0).getReg()});
     };
     return true;
   }
 
   return false;
 }
 
+bool CombinerHelper::matchCombineFSubFNegFMulToFMadOrFMA(
+    MachineInstr &MI, std::function<void(MachineIRBuilder &)> &MatchInfo) {
+  assert(MI.getOpcode() == TargetOpcode::G_FSUB);
+
+  bool AllowFusionGlobally, HasFMAD, Aggressive;
+  if (!canCombineFMadOrFMA(MI, AllowFusionGlobally, HasFMAD, Aggressive))
+    return false;
+
+  Register LHSReg = MI.getOperand(1).getReg();
+  Register RHSReg = MI.getOperand(2).getReg();
+  LLT DstTy = MRI.getType(MI.getOperand(0).getReg());
+
+  unsigned PreferredFusedOpcode =
+      HasFMAD ? TargetOpcode::G_FMAD : TargetOpcode::G_FMA;
+
+  MachineInstr *FMulMI;
+  // fold (fsub (fneg (fmul x, y)), z) -> (fma (fneg x), y, (fneg z))
+  if (mi_match(LHSReg, MRI, m_GFNeg(m_MInstr(FMulMI))) &&
+      (Aggressive || (MRI.hasOneNonDBGUse(LHSReg) &&
+                      MRI.hasOneNonDBGUse(FMulMI->getOperand(0).getReg()))) &&
+      isContractableFMul(*FMulMI, AllowFusionGlobally)) {
+    MatchInfo = [=, &MI](MachineIRBuilder &B) {
+      Register NegX =
+          B.buildFNeg(DstTy, FMulMI->getOperand(1).getReg()).getReg(0);
+      Register NegZ = B.buildFNeg(DstTy, RHSReg).getReg(0);
+      B.buildInstr(PreferredFusedOpcode, {MI.getOperand(0).getReg()},
+                   {NegX, FMulMI->getOperand(2).getReg(), NegZ});
+    };
+    return true;
+  }
+
+  // fold (fsub x, (fneg (fmul, y, z))) -> (fma y, z, x)
+  if (mi_match(RHSReg, MRI, m_GFNeg(m_MInstr(FMulMI))) &&
+      (Aggressive || (MRI.hasOneNonDBGUse(RHSReg) &&
+                      MRI.hasOneNonDBGUse(FMulMI->getOperand(0).getReg()))) &&
+      isContractableFMul(*FMulMI, AllowFusionGlobally)) {
+    MatchInfo = [=, &MI](MachineIRBuilder &B) {
+      B.buildInstr(PreferredFusedOpcode, {MI.getOperand(0).getReg()},
+                   {FMulMI->getOperand(1).getReg(),
+                    FMulMI->getOperand(2).getReg(), LHSReg});
+    };
+    return true;
+  }
+
+  return false;
+}
+
 bool CombinerHelper::tryCombine(MachineInstr &MI) {
   if (tryCombineCopy(MI))
     return true;
   if (tryCombineExtendingLoads(MI))
     return true;
   if (tryCombineIndexedLoadStore(MI))
     return true;
   return false;
 }

llvm/test/CodeGen/AMDGPU/GlobalISel/combine-fma-sub-neg-mul.ll

+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+; RUN: llc -global-isel -march=amdgcn -mcpu=gfx900 < %s | FileCheck -check-prefix=GFX9 %s
+; RUN: llc -global-isel -march=amdgcn -mcpu=gfx900 -fp-contract=fast < %s | FileCheck -check-prefix=GFX9-CONTRACT %s
+; RUN: llc -global-isel -march=amdgcn -mcpu=gfx900 --denormal-fp-math=preserve-sign < %s | FileCheck -check-prefix=GFX9-DENORM %s
+; RUN: llc -global-isel -march=amdgcn -mcpu=gfx1010 < %s | FileCheck -check-prefix=GFX10 %s
+; RUN: llc -global-isel -march=amdgcn -mcpu=gfx1010 -fp-contract=fast < %s | FileCheck -check-prefix=GFX10-CONTRACT %s
+; RUN: llc -global-isel -march=amdgcn -mcpu=gfx1010 --denormal-fp-math=preserve-sign < %s | FileCheck -check-prefix=GFX10-DENORM %s
+
+; fold (fsub (fneg (fmul, x, y)), z) -> (fma (fneg x), y, (fneg z))
+define float @test_f32_sub_ext_neg_mul(float %x, float %y, float %z) {
+; GFX9-LABEL: test_f32_sub_ext_neg_mul:
+; GFX9:       ; %bb.0: ; %entry
+; GFX9-NEXT:    s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0)
+; GFX9-NEXT:    v_mul_f32_e64 v0, v0, -v1
+; GFX9-NEXT:    v_sub_f32_e32 v0, v0, v2
+; GFX9-NEXT:    s_setpc_b64 s[30:31]
+;
+; GFX9-CONTRACT-LABEL: test_f32_sub_ext_neg_mul:
+; GFX9-CONTRACT:       ; %bb.0: ; %entry
+; GFX9-CONTRACT-NEXT:    s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0)
+; GFX9-CONTRACT-NEXT:    v_fma_f32 v0, v0, -v1, -v2
+; GFX9-CONTRACT-NEXT:    s_setpc_b64 s[30:31]
+;
+; GFX9-DENORM-LABEL: test_f32_sub_ext_neg_mul:
+; GFX9-DENORM:       ; %bb.0: ; %entry
+; GFX9-DENORM-NEXT:    s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0)
+; GFX9-DENORM-NEXT:    v_mad_f32 v0, v0, -v1, -v2
+; GFX9-DENORM-NEXT:    s_setpc_b64 s[30:31]
+;
+; GFX10-LABEL: test_f32_sub_ext_neg_mul:
+; GFX10:       ; %bb.0: ; %entry
+; GFX10-NEXT:    s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0)
+; GFX10-NEXT:    s_waitcnt_vscnt null, 0x0
+; GFX10-NEXT:    v_mul_f32_e64 v0, v0, -v1
+; GFX10-NEXT:    v_sub_f32_e32 v0, v0, v2
+; GFX10-NEXT:    s_setpc_b64 s[30:31]
+;
+; GFX10-CONTRACT-LABEL: test_f32_sub_ext_neg_mul:
+; GFX10-CONTRACT:       ; %bb.0: ; %entry
+; GFX10-CONTRACT-NEXT:    s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0)
+; GFX10-CONTRACT-NEXT:    s_waitcnt_vscnt null, 0x0
+; GFX10-CONTRACT-NEXT:    v_fma_f32 v0, v0, -v1, -v2
+; GFX10-CONTRACT-NEXT:    s_setpc_b64 s[30:31]
+;
+; GFX10-DENORM-LABEL: test_f32_sub_ext_neg_mul:
+; GFX10-DENORM:       ; %bb.0: ; %entry
+; GFX10-DENORM-NEXT:    s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0)
+; GFX10-DENORM-NEXT:    s_waitcnt_vscnt null, 0x0
+; GFX10-DENORM-NEXT:    v_mad_f32 v0, v0, -v1, -v2
+; GFX10-DENORM-NEXT:    s_setpc_b64 s[30:31]
+entry:
+  %a = fmul float %x, %y
+  %b = fneg float %a
+  %c = fsub float %b, %z
+  ret float %c
+}
+
+define half @test_f16_sub_ext_neg_mul(half %x, half %y, half %z) {
+; GFX9-LABEL: test_f16_sub_ext_neg_mul:
+; GFX9:       ; %bb.0: ; %entry
+; GFX9-NEXT:    s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0)
+; GFX9-NEXT:    v_mul_f16_e64 v0, v0, -v1
+; GFX9-NEXT:    v_add_f16_e64 v0, v0, -v2
+; GFX9-NEXT:    s_setpc_b64 s[30:31]
+;
+; GFX9-CONTRACT-LABEL: test_f16_sub_ext_neg_mul:
+; GFX9-CONTRACT:       ; %bb.0: ; %entry
+; GFX9-CONTRACT-NEXT:    s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0)
+; GFX9-CONTRACT-NEXT:    s_mov_b32 s4, 0x8000
+; GFX9-CONTRACT-NEXT:    v_xor_b32_e32 v1, s4, v1
+; GFX9-CONTRACT-NEXT:    v_xor_b32_e32 v2, s4, v2
+; GFX9-CONTRACT-NEXT:    v_fma_f16 v0, v0, v1, v2
+; GFX9-CONTRACT-NEXT:    s_setpc_b64 s[30:31]
+;
+; GFX9-DENORM-LABEL: test_f16_sub_ext_neg_mul:
+; GFX9-DENORM:       ; %bb.0: ; %entry
+; GFX9-DENORM-NEXT:    s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0)
+; GFX9-DENORM-NEXT:    v_mad_legacy_f16 v0, v0, -v1, -v2
+; GFX9-DENORM-NEXT:    s_setpc_b64 s[30:31]
+;
+; GFX10-LABEL: test_f16_sub_ext_neg_mul:
+; GFX10:       ; %bb.0: ; %entry
+; GFX10-NEXT:    s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0)
+; GFX10-NEXT:    s_waitcnt_vscnt null, 0x0
+; GFX10-NEXT:    v_mul_f16_e64 v0, v0, -v1
+; GFX10-NEXT:    v_add_f16_e64 v0, v0, -v2
+; GFX10-NEXT:    s_setpc_b64 s[30:31]
+;
+; GFX10-CONTRACT-LABEL: test_f16_sub_ext_neg_mul:
+; GFX10-CONTRACT:       ; %bb.0: ; %entry
+; GFX10-CONTRACT-NEXT:    s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0)
+; GFX10-CONTRACT-NEXT:    s_waitcnt_vscnt null, 0x0
+; GFX10-CONTRACT-NEXT:    s_mov_b32 s4, 0x8000
+; GFX10-CONTRACT-NEXT:    v_xor_b32_e32 v1, s4, v1
+; GFX10-CONTRACT-NEXT:    v_xor_b32_e32 v2, s4, v2
+; GFX10-CONTRACT-NEXT:    v_fma_f16 v0, v0, v1, v2
+; GFX10-CONTRACT-NEXT:    s_setpc_b64 s[30:31]
+;
+; GFX10-DENORM-LABEL: test_f16_sub_ext_neg_mul:
+; GFX10-DENORM:       ; %bb.0: ; %entry
+; GFX10-DENORM-NEXT:    s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0)
+; GFX10-DENORM-NEXT:    s_waitcnt_vscnt null, 0x0
+; GFX10-DENORM-NEXT:    v_mul_f16_e64 v0, v0, -v1
+; GFX10-DENORM-NEXT:    v_add_f16_e64 v0, v0, -v2
+; GFX10-DENORM-NEXT:    s_setpc_b64 s[30:31]
+entry:
+  %a = fmul half %x, %y
+  %b = fneg half %a
+  %c = fsub half %b, %z
+  ret half %c
+}
+
+define double @test_f64_sub_ext_neg_mul(double %x, double %y, double %z) {
+; GFX9-LABEL: test_f64_sub_ext_neg_mul:
+; GFX9:       ; %bb.0: ; %entry
+; GFX9-NEXT:    s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0)
+; GFX9-NEXT:    v_mul_f64 v[0:1], v[0:1], v[2:3]
+; GFX9-NEXT:    v_add_f64 v[0:1], -v[0:1], -v[4:5]
+; GFX9-NEXT:    s_setpc_b64 s[30:31]
+;
+; GFX9-CONTRACT-LABEL: test_f64_sub_ext_neg_mul:
+; GFX9-CONTRACT:       ; %bb.0: ; %entry
+; GFX9-CONTRACT-NEXT:    s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0)
+; GFX9-CONTRACT-NEXT:    v_fma_f64 v[0:1], -v[0:1], v[2:3], -v[4:5]
+; GFX9-CONTRACT-NEXT:    s_setpc_b64 s[30:31]
+;
+; GFX9-DENORM-LABEL: test_f64_sub_ext_neg_mul:
+; GFX9-DENORM:       ; %bb.0: ; %entry
+; GFX9-DENORM-NEXT:    s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0)
+; GFX9-DENORM-NEXT:    v_mul_f64 v[0:1], v[0:1], v[2:3]
+; GFX9-DENORM-NEXT:    v_add_f64 v[0:1], -v[0:1], -v[4:5]
+; GFX9-DENORM-NEXT:    s_setpc_b64 s[30:31]
+;
+; GFX10-LABEL: test_f64_sub_ext_neg_mul:
+; GFX10:       ; %bb.0: ; %entry
+; GFX10-NEXT:    s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0)
+; GFX10-NEXT:    s_waitcnt_vscnt null, 0x0
+; GFX10-NEXT:    v_mul_f64 v[0:1], v[0:1], v[2:3]
+; GFX10-NEXT:    v_add_f64 v[0:1], -v[0:1], -v[4:5]
+; GFX10-NEXT:    s_setpc_b64 s[30:31]
+;
+; GFX10-CONTRACT-LABEL: test_f64_sub_ext_neg_mul:
+; GFX10-CONTRACT:       ; %bb.0: ; %entry
+; GFX10-CONTRACT-NEXT:    s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0)
+; GFX10-CONTRACT-NEXT:    s_waitcnt_vscnt null, 0x0
+; GFX10-CONTRACT-NEXT:    v_fma_f64 v[0:1], -v[0:1], v[2:3], -v[4:5]
+; GFX10-CONTRACT-NEXT:    s_setpc_b64 s[30:31]
+;
+; GFX10-DENORM-LABEL: test_f64_sub_ext_neg_mul:
+; GFX10-DENORM:       ; %bb.0: ; %entry
+; GFX10-DENORM-NEXT:    s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0)
+; GFX10-DENORM-NEXT:    s_waitcnt_vscnt null, 0x0
+; GFX10-DENORM-NEXT:    v_mul_f64 v[0:1], v[0:1], v[2:3]
+; GFX10-DENORM-NEXT:    v_add_f64 v[0:1], -v[0:1], -v[4:5]
+; GFX10-DENORM-NEXT:    s_setpc_b64 s[30:31]
+entry:
+  %a = fmul double %x, %y
+  %b = fneg double %a
+  %c = fsub double %b, %z
+  ret double %c
+}
+
+; fold (fsub (fneg (fmul, x, y)), z) -> (fma (fneg x), y, (fneg z))
+define <4 x float> @test_v4f32_sub_ext_neg_mul(<4 x float> %x, <4 x float> %y, <4 x float> %z) {
+; GFX9-LABEL: test_v4f32_sub_ext_neg_mul:
+; GFX9:       ; %bb.0: ; %entry
+; GFX9-NEXT:    s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0)
+; GFX9-NEXT:    v_mul_f32_e64 v0, v0, -v4
+; GFX9-NEXT:    v_mul_f32_e64 v1, v1, -v5
+; GFX9-NEXT:    v_mul_f32_e64 v2, v2, -v6
+; GFX9-NEXT:    v_mul_f32_e64 v3, v3, -v7
+; GFX9-NEXT:    v_sub_f32_e32 v0, v0, v8
+; GFX9-NEXT:    v_sub_f32_e32 v1, v1, v9
+; GFX9-NEXT:    v_sub_f32_e32 v2, v2, v10
+; GFX9-NEXT:    v_sub_f32_e32 v3, v3, v11
+; GFX9-NEXT:    s_setpc_b64 s[30:31]
+;
+; GFX9-CONTRACT-LABEL: test_v4f32_sub_ext_neg_mul:
+; GFX9-CONTRACT:       ; %bb.0: ; %entry
+; GFX9-CONTRACT-NEXT:    s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0)
+; GFX9-CONTRACT-NEXT:    v_fma_f32 v0, v0, -v4, -v8
+; GFX9-CONTRACT-NEXT:    v_fma_f32 v1, v1, -v5, -v9
+; GFX9-CONTRACT-NEXT:    v_fma_f32 v2, v2, -v6, -v10
+; GFX9-CONTRACT-NEXT:    v_fma_f32 v3, v3, -v7, -v11
+; GFX9-CONTRACT-NEXT:    s_setpc_b64 s[30:31]
+;
+; GFX9-DENORM-LABEL: test_v4f32_sub_ext_neg_mul:
+; GFX9-DENORM:       ; %bb.0: ; %entry
+; GFX9-DENORM-NEXT:    s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0)
+; GFX9-DENORM-NEXT:    v_mad_f32 v0, v0, -v4, -v8
+; GFX9-DENORM-NEXT:    v_mad_f32 v1, v1, -v5, -v9
+; GFX9-DENORM-NEXT:    v_mad_f32 v2, v2, -v6, -v10
+; GFX9-DENORM-NEXT:    v_mad_f32 v3, v3, -v7, -v11
+; GFX9-DENORM-NEXT:    s_setpc_b64 s[30:31]
+;
+; GFX10-LABEL: test_v4f32_sub_ext_neg_mul:
+; GFX10:       ; %bb.0: ; %entry
+; GFX10-NEXT:    s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0)
+; GFX10-NEXT:    s_waitcnt_vscnt null, 0x0
+; GFX10-NEXT:    v_mul_f32_e64 v0, v0, -v4
+; GFX10-NEXT:    v_mul_f32_e64 v1, v1, -v5
+; GFX10-NEXT:    v_mul_f32_e64 v2, v2, -v6
+; GFX10-NEXT:    v_mul_f32_e64 v3, v3, -v7
+; GFX10-NEXT:    v_sub_f32_e32 v0, v0, v8
+; GFX10-NEXT:    v_sub_f32_e32 v1, v1, v9
+; GFX10-NEXT:    v_sub_f32_e32 v2, v2, v10
+; GFX10-NEXT:    v_sub_f32_e32 v3, v3, v11
+; GFX10-NEXT:    s_setpc_b64 s[30:31]
+;
+; GFX10-CONTRACT-LABEL: test_v4f32_sub_ext_neg_mul:
+; GFX10-CONTRACT:       ; %bb.0: ; %entry
+; GFX10-CONTRACT-NEXT:    s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0)
+; GFX10-CONTRACT-NEXT:    s_waitcnt_vscnt null, 0x0
+; GFX10-CONTRACT-NEXT:    v_fma_f32 v0, v0, -v4, -v8
+; GFX10-CONTRACT-NEXT:    v_fma_f32 v1, v1, -v5, -v9
+; GFX10-CONTRACT-NEXT:    v_fma_f32 v2, v2, -v6, -v10
+; GFX10-CONTRACT-NEXT:    v_fma_f32 v3, v3, -v7, -v11
+; GFX10-CONTRACT-NEXT:    s_setpc_b64 s[30:31]
+;
+; GFX10-DENORM-LABEL: test_v4f32_sub_ext_neg_mul:
+; GFX10-DENORM:       ; %bb.0: ; %entry
+; GFX10-DENORM-NEXT:    s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0)
+; GFX10-DENORM-NEXT:    s_waitcnt_vscnt null, 0x0
+; GFX10-DENORM-NEXT:    v_mad_f32 v0, v0, -v4, -v8
+; GFX10-DENORM-NEXT:    v_mad_f32 v1, v1, -v5, -v9
+; GFX10-DENORM-NEXT:    v_mad_f32 v2, v2, -v6, -v10
+; GFX10-DENORM-NEXT:    v_mad_f32 v3, v3, -v7, -v11
+; GFX10-DENORM-NEXT:    s_setpc_b64 s[30:31]
+entry:
+  %a = fmul <4 x float> %x, %y
+  %b = fneg <4 x float> %a
+  %c = fsub <4 x float> %b, %z
+  ret <4 x float> %c
+}
+
+define <4 x half> @test_v4f16_sub_ext_neg_mul(<4 x half> %x, <4 x half> %y, <4 x half> %z) {
+; GFX9-LABEL: test_v4f16_sub_ext_neg_mul:
+; GFX9:       ; %bb.0: ; %entry
+; GFX9-NEXT:    s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0)
+; GFX9-NEXT:    v_pk_mul_f16 v0, v0, v2 neg_lo:[0,1] neg_hi:[0,1]
+; GFX9-NEXT:    v_pk_mul_f16 v1, v1, v3 neg_lo:[0,1] neg_hi:[0,1]
+; GFX9-NEXT:    v_add_f16_e64 v2, v0, -v4
+; GFX9-NEXT:    v_add_f16_sdwa v0, v0, -v4 dst_sel:WORD_1 dst_unused:UNUSED_PAD src0_sel:WORD_1 src1_sel:WORD_1
+; GFX9-NEXT:    v_add_f16_e64 v3, v1, -v5
+; GFX9-NEXT:    v_add_f16_sdwa v1, v1, -v5 dst_sel:WORD_1 dst_unused:UNUSED_PAD src0_sel:WORD_1 src1_sel:WORD_1
+; GFX9-NEXT:    v_mov_b32_e32 v4, 0xffff
+; GFX9-NEXT:    v_and_or_b32 v0, v2, v4, v0
+; GFX9-NEXT:    v_and_or_b32 v1, v3, v4, v1
+; GFX9-NEXT:    s_setpc_b64 s[30:31]
+;
+; GFX9-CONTRACT-LABEL: test_v4f16_sub_ext_neg_mul:
+; GFX9-CONTRACT:       ; %bb.0: ; %entry
+; GFX9-CONTRACT-NEXT:    s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0)
+; GFX9-CONTRACT-NEXT:    v_pk_fma_f16 v0, v0, v2, v4 neg_lo:[0,1,1] neg_hi:[0,1,1]
+; GFX9-CONTRACT-NEXT:    v_pk_fma_f16 v1, v1, v3, v5 neg_lo:[0,1,1] neg_hi:[0,1,1]
+; GFX9-CONTRACT-NEXT:    s_setpc_b64 s[30:31]
+;
+; GFX9-DENORM-LABEL: test_v4f16_sub_ext_neg_mul:
+; GFX9-DENORM:       ; %bb.0: ; %entry
+; GFX9-DENORM-NEXT:    s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0)
+; GFX9-DENORM-NEXT:    v_pk_mul_f16 v0, v0, v2 neg_lo:[0,1] neg_hi:[0,1]
+; GFX9-DENORM-NEXT:    v_pk_mul_f16 v1, v1, v3 neg_lo:[0,1] neg_hi:[0,1]
+; GFX9-DENORM-NEXT:    v_add_f16_e64 v2, v0, -v4
+; GFX9-DENORM-NEXT:    v_add_f16_sdwa v0, v0, -v4 dst_sel:WORD_1 dst_unused:UNUSED_PAD src0_sel:WORD_1 src1_sel:WORD_1
+; GFX9-DENORM-NEXT:    v_add_f16_e64 v3, v1, -v5
+; GFX9-DENORM-NEXT:    v_add_f16_sdwa v1, v1, -v5 dst_sel:WORD_1 dst_unused:UNUSED_PAD src0_sel:WORD_1 src1_sel:WORD_1
+; GFX9-DENORM-NEXT:    v_mov_b32_e32 v4, 0xffff
+; GFX9-DENORM-NEXT:    v_and_or_b32 v0, v2, v4, v0
+; GFX9-DENORM-NEXT:    v_and_or_b32 v1, v3, v4, v1
+; GFX9-DENORM-NEXT:    s_setpc_b64 s[30:31]
+;
+; GFX10-LABEL: test_v4f16_sub_ext_neg_mul:
+; GFX10:       ; %bb.0: ; %entry
+; GFX10-NEXT:    s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0)
+; GFX10-NEXT:    s_waitcnt_vscnt null, 0x0
+; GFX10-NEXT:    v_pk_mul_f16 v0, v0, v2 neg_lo:[0,1] neg_hi:[0,1]
+; GFX10-NEXT:    v_pk_mul_f16 v1, v1, v3 neg_lo:[0,1] neg_hi:[0,1]
+; GFX10-NEXT:    v_add_f16_e64 v2, v0, -v4
+; GFX10-NEXT:    v_add_f16_sdwa v0, v0, -v4 dst_sel:WORD_1 dst_unused:UNUSED_PAD src0_sel:WORD_1 src1_sel:WORD_1
+; GFX10-NEXT:    v_add_f16_e64 v3, v1, -v5
+; GFX10-NEXT:    v_mov_b32_e32 v4, 0xffff
+; GFX10-NEXT:    v_add_f16_sdwa v1, v1, -v5 dst_sel:WORD_1 dst_unused:UNUSED_PAD src0_sel:WORD_1 src1_sel:WORD_1
+; GFX10-NEXT:    v_and_or_b32 v0, v2, v4, v0
+; GFX10-NEXT:    v_and_or_b32 v1, v3, v4, v1
+; GFX10-NEXT:    s_setpc_b64 s[30:31]
+;
+; GFX10-CONTRACT-LABEL: test_v4f16_sub_ext_neg_mul:
+; GFX10-CONTRACT:       ; %bb.0: ; %entry
+; GFX10-CONTRACT-NEXT:    s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0)
+; GFX10-CONTRACT-NEXT:    s_waitcnt_vscnt null, 0x0
+; GFX10-CONTRACT-NEXT:    v_pk_fma_f16 v0, v0, v2, v4 neg_lo:[0,1,1] neg_hi:[0,1,1]
+; GFX10-CONTRACT-NEXT:    v_pk_fma_f16 v1, v1, v3, v5 neg_lo:[0,1,1] neg_hi:[0,1,1]
+; GFX10-CONTRACT-NEXT:    s_setpc_b64 s[30:31]
+;
+; GFX10-DENORM-LABEL: test_v4f16_sub_ext_neg_mul:
+; GFX10-DENORM:       ; %bb.0: ; %entry
+; GFX10-DENORM-NEXT:    s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0)
+; GFX10-DENORM-NEXT:    s_waitcnt_vscnt null, 0x0
+; GFX10-DENORM-NEXT:    v_pk_mul_f16 v0, v0, v2 neg_lo:[0,1] neg_hi:[0,1]
+; GFX10-DENORM-NEXT:    v_pk_mul_f16 v1, v1, v3 neg_lo:[0,1] neg_hi:[0,1]
+; GFX10-DENORM-NEXT:    v_add_f16_e64 v2, v0, -v4
+; GFX10-DENORM-NEXT:    v_add_f16_sdwa v0, v0, -v4 dst_sel:WORD_1 dst_unused:UNUSED_PAD src0_sel:WORD_1 src1_sel:WORD_1
+; GFX10-DENORM-NEXT:    v_add_f16_e64 v3, v1, -v5
+; GFX10-DENORM-NEXT:    v_mov_b32_e32 v4, 0xffff
+; GFX10-DENORM-NEXT:    v_add_f16_sdwa v1, v1, -v5 dst_sel:WORD_1 dst_unused:UNUSED_PAD src0_sel:WORD_1 src1_sel:WORD_1
+; GFX10-DENORM-NEXT:    v_and_or_b32 v0, v2, v4, v0
+; GFX10-DENORM-NEXT:    v_and_or_b32 v1, v3, v4, v1
+; GFX10-DENORM-NEXT:    s_setpc_b64 s[30:31]
+entry:
+  %a = fmul <4 x half> %x, %y
+  %b = fneg <4 x half> %a
+  %c = fsub <4 x half> %b, %z
+  ret <4 x half> %c
+}
+
+define <4 x double> @test_v4f64_sub_ext_neg_mul(<4 x double> %x, <4 x double> %y, <4 x double> %z) {
+; GFX9-LABEL: test_v4f64_sub_ext_neg_mul:
+; GFX9:       ; %bb.0: ; %entry
+; GFX9-NEXT:    s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0)
+; GFX9-NEXT:    v_mul_f64 v[0:1], v[0:1], v[8:9]
+; GFX9-NEXT:    v_mul_f64 v[2:3], v[2:3], v[10:11]
+; GFX9-NEXT:    v_mul_f64 v[4:5], v[4:5], v[12:13]
+; GFX9-NEXT:    v_mul_f64 v[6:7], v[6:7], v[14:15]
+; GFX9-NEXT:    v_add_f64 v[0:1], -v[0:1], -v[16:17]
+; GFX9-NEXT:    v_add_f64 v[2:3], -v[2:3], -v[18:19]
+; GFX9-NEXT:    v_add_f64 v[4:5], -v[4:5], -v[20:21]
+; GFX9-NEXT:    v_add_f64 v[6:7], -v[6:7], -v[22:23]
+; GFX9-NEXT:    s_setpc_b64 s[30:31]
+;
+; GFX9-CONTRACT-LABEL: test_v4f64_sub_ext_neg_mul:
+; GFX9-CONTRACT:       ; %bb.0: ; %entry
+; GFX9-CONTRACT-NEXT:    s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0)
+; GFX9-CONTRACT-NEXT:    v_fma_f64 v[0:1], -v[0:1], v[8:9], -v[16:17]
+; GFX9-CONTRACT-NEXT:    v_fma_f64 v[2:3], -v[2:3], v[10:11], -v[18:19]
+; GFX9-CONTRACT-NEXT:    v_fma_f64 v[4:5], -v[4:5], v[12:13], -v[20:21]
+; GFX9-CONTRACT-NEXT:    v_fma_f64 v[6:7], -v[6:7], v[14:15], -v[22:23]
+; GFX9-CONTRACT-NEXT:    s_setpc_b64 s[30:31]
+;
+; GFX9-DENORM-LABEL: test_v4f64_sub_ext_neg_mul:
+; GFX9-DENORM:       ; %bb.0: ; %entry
+; GFX9-DENORM-NEXT:    s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0)
+; GFX9-DENORM-NEXT:    v_mul_f64 v[0:1], v[0:1], v[8:9]
+; GFX9-DENORM-NEXT:    v_mul_f64 v[2:3], v[2:3], v[10:11]
+; GFX9-DENORM-NEXT:    v_mul_f64 v[4:5], v[4:5], v[12:13]
+; GFX9-DENORM-NEXT:    v_mul_f64 v[6:7], v[6:7], v[14:15]
+; GFX9-DENORM-NEXT:    v_add_f64 v[0:1], -v[0:1], -v[16:17]
+; GFX9-DENORM-NEXT:    v_add_f64 v[2:3], -v[2:3], -v[18:19]
+; GFX9-DENORM-NEXT:    v_add_f64 v[4:5], -v[4:5], -v[20:21]
+; GFX9-DENORM-NEXT:    v_add_f64 v[6:7], -v[6:7], -v[22:23]
+; GFX9-DENORM-NEXT:    s_setpc_b64 s[30:31]
+;
+; GFX10-LABEL: test_v4f64_sub_ext_neg_mul:
+; GFX10:       ; %bb.0: ; %entry
+; GFX10-NEXT:    s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0)
+; GFX10-NEXT:    s_waitcnt_vscnt null, 0x0
+; GFX10-NEXT:    v_mul_f64 v[0:1], v[0:1], v[8:9]
+; GFX10-NEXT:    v_mul_f64 v[2:3], v[2:3], v[10:11]
+; GFX10-NEXT:    v_mul_f64 v[4:5], v[4:5], v[12:13]
+; GFX10-NEXT:    v_mul_f64 v[6:7], v[6:7], v[14:15]
+; GFX10-NEXT:    v_add_f64 v[0:1], -v[0:1], -v[16:17]
+; GFX10-NEXT:    v_add_f64 v[2:3], -v[2:3], -v[18:19]
+; GFX10-NEXT:    v_add_f64 v[4:5], -v[4:5], -v[20:21]
+; GFX10-NEXT:    v_add_f64 v[6:7], -v[6:7], -v[22:23]
+; GFX10-NEXT:    s_setpc_b64 s[30:31]
+;
+; GFX10-CONTRACT-LABEL: test_v4f64_sub_ext_neg_mul:
+; GFX10-CONTRACT:       ; %bb.0: ; %entry
+; GFX10-CONTRACT-NEXT:    s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0)
+; GFX10-CONTRACT-NEXT:    s_waitcnt_vscnt null, 0x0
+; GFX10-CONTRACT-NEXT:    v_fma_f64 v[0:1], -v[0:1], v[8:9], -v[16:17]
+; GFX10-CONTRACT-NEXT:    v_fma_f64 v[2:3], -v[2:3], v[10:11], -v[18:19]
+; GFX10-CONTRACT-NEXT:    v_fma_f64 v[4:5], -v[4:5], v[12:13], -v[20:21]
+; GFX10-CONTRACT-NEXT:    v_fma_f64 v[6:7], -v[6:7], v[14:15], -v[22:23]
+; GFX10-CONTRACT-NEXT:    s_setpc_b64 s[30:31]
+;
+; GFX10-DENORM-LABEL: test_v4f64_sub_ext_neg_mul:
+; GFX10-DENORM:       ; %bb.0: ; %entry
+; GFX10-DENORM-NEXT:    s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0)
+; GFX10-DENORM-NEXT:    s_waitcnt_vscnt null, 0x0
+; GFX10-DENORM-NEXT:    v_mul_f64 v[0:1], v[0:1], v[8:9]
+; GFX10-DENORM-NEXT:    v_mul_f64 v[2:3], v[2:3], v[10:11]
+; GFX10-DENORM-NEXT:    v_mul_f64 v[4:5], v[4:5], v[12:13]
+; GFX10-DENORM-NEXT:    v_mul_f64 v[6:7], v[6:7], v[14:15]
+; GFX10-DENORM-NEXT:    v_add_f64 v[0:1], -v[0:1], -v[16:17]
+; GFX10-DENORM-NEXT:    v_add_f64 v[2:3], -v[2:3], -v[18:19]
+; GFX10-DENORM-NEXT:    v_add_f64 v[4:5], -v[4:5], -v[20:21]
+; GFX10-DENORM-NEXT:    v_add_f64 v[6:7], -v[6:7], -v[22:23]
+; GFX10-DENORM-NEXT:    s_setpc_b64 s[30:31]
+entry:
+  %a = fmul <4 x double> %x, %y
+  %b = fneg <4 x double> %a
+  %c = fsub <4 x double> %b, %z
+  ret <4 x double> %c
+}