[AMDGPU] Change predicate for fma/fmac legacy

[rampitec]

Summary

I do not exactly like the use of a negative predicate to
enable instructions' support. Change HasNoMadMacF32Insts
with HasFmaLegacy32.

[arsenm]

I don't think this should move towards less fine grained predicates. You could rename to HasFmacLegacy

[rampitec]

Changed predicate to HasFmaLegacy.

[foad]

Sorry to bikeshed, but I think HasFmaLegacyF32 would be a better name. This has nothing to do with the v_fma_legacy_f16 instruction, which has a completely kind of "legacy" behaviour. OK with that change.

[rampitec]

Renamed to HasFmaLegacyF32 as suggested by Jay.

llvm/lib/Target/AMDGPU/AMDGPU.td

 def HasNoSMemTimeInst : Predicate<"!Subtarget->hasSMemTimeInst()">;
 
 def HasPkFmacF16Inst : Predicate<"Subtarget->hasPkFmacF16Inst()">,
   AssemblerPredicate<(all_of FeaturePkFmacF16Inst)>;
 
 def HasMadMacF32Insts : Predicate<"Subtarget->hasMadMacF32Insts()">,
   AssemblerPredicate<(all_of FeatureMadMacF32Insts)>;
 
+def HasFmaLegacy : Predicate<"Subtarget->hasGFX10_3Insts()">,
+  AssemblerPredicate<(any_of FeatureGFX10_3Insts)>;
+
 def HasAtomicFaddInsts : Predicate<"Subtarget->hasAtomicFaddInsts()">,
   AssemblerPredicate<(all_of FeatureAtomicFaddInsts)>;
 
-def HasNoMadMacF32Insts : Predicate<"!Subtarget->hasMadMacF32Insts()">,
-  AssemblerPredicate<(all_of (not FeatureMadMacF32Insts))>;
-
 def HasDsSrc2Insts : Predicate<"!Subtarget->hasDsSrc2Insts()">,
   AssemblerPredicate<(all_of FeatureDsSrc2Insts)>;
 
 def HasOffset3fBug : Predicate<"!Subtarget->hasOffset3fBug()">,
   AssemblerPredicate<(all_of FeatureOffset3fBug)>;
 
 def EnableLateCFGStructurize : Predicate<
   "EnableLateStructurizeCFG">;

llvm/lib/Target/AMDGPU/SIInstructions.td

def : GCNPat <
                                     (VOP3NoMods f32:$src1)),
                  (VOP3NoMods f32:$src2))),
       (V_MAC_LEGACY_F32_e64 SRCMODS.NONE, $src0, SRCMODS.NONE, $src1,
                             SRCMODS.NONE, $src2, DSTCLAMP.NONE, DSTOMOD.NONE)
 >;
 
 // Don't allow source modifiers. If there are any source modifiers then it's
 // better to select fma instead of fmac.
-let SubtargetPredicate = HasNoMadMacF32Insts in
+let SubtargetPredicate = HasFmaLegacy in
 def : GCNPat <
       (f32 (int_amdgcn_fma_legacy (VOP3NoMods f32:$src0),
                                   (VOP3NoMods f32:$src1),
                                   (VOP3NoMods f32:$src2))),
       (V_FMAC_LEGACY_F32_e64 SRCMODS.NONE, $src0, SRCMODS.NONE, $src1,
                              SRCMODS.NONE, $src2, DSTCLAMP.NONE, DSTOMOD.NONE)
 >;
 

llvm/lib/Target/AMDGPU/VOP2Instructions.td

 let Constraints = "$vdst = $src2",
     DisableEncoding = "$src2",
     isConvertibleToThreeAddress = 1,
     isCommutable = 1 in
 defm V_FMAC_F32 : VOP2Inst <"v_fmac_f32", VOP_MAC_F32>;
 
 } // End SubtargetPredicate = HasDLInsts
 
-let SubtargetPredicate = HasNoMadMacF32Insts in {
+let SubtargetPredicate = HasFmaLegacy in {
 
 let Constraints = "$vdst = $src2",
     DisableEncoding = "$src2",
     isConvertibleToThreeAddress = 1,
     isCommutable = 1 in
 defm V_FMAC_LEGACY_F32 : VOP2Inst <"v_fmac_legacy_f32", VOP_MAC_LEGACY_F32>;
 
-} // End SubtargetPredicate = HasNoMadMacF32Insts
+} // End SubtargetPredicate = HasFmaLegacy
 
 let Constraints = "$vdst = $src2",
       DisableEncoding="$src2",
       isConvertibleToThreeAddress = 1,
       isCommutable = 1,
       IsDOT = 1 in {
   let SubtargetPredicate = HasDot5Insts in
     defm V_DOT2C_F32_F16 : VOP2Inst<"v_dot2c_f32_f16", VOP_DOT_ACC_F32_V2F16>;

llvm/lib/Target/AMDGPU/VOP3Instructions.td

 let isCommutable = 1 in {
 
 let mayRaiseFPException = 0 in {
 let SubtargetPredicate = HasMadMacF32Insts in {
 def V_MAD_LEGACY_F32 : VOP3Inst <"v_mad_legacy_f32", VOP3_Profile<VOP_F32_F32_F32_F32>>;
 def V_MAD_F32 : VOP3Inst <"v_mad_f32", VOP3_Profile<VOP_F32_F32_F32_F32>, fmad>;
 } // End SubtargetPredicate = HasMadMacInsts
 
-let SubtargetPredicate = HasNoMadMacF32Insts in
+let SubtargetPredicate = HasFmaLegacy in
 def V_FMA_LEGACY_F32 : VOP3Inst <"v_fma_legacy_f32",
                                  VOP3_Profile<VOP_F32_F32_F32_F32>,
                                  int_amdgcn_fma_legacy>;
 }
 
 def V_MAD_I32_I24 : VOP3Inst <"v_mad_i32_i24", VOP3_Profile<VOP_I32_I32_I32_I32, VOP3_CLAMP>>;
 def V_MAD_U32_U24 : VOP3Inst <"v_mad_u32_u24", VOP3_Profile<VOP_I32_I32_I32_I32, VOP3_CLAMP>>;
 def V_FMA_F32 : VOP3Inst <"v_fma_f32", VOP3_Profile<VOP_F32_F32_F32_F32>, any_fma>;