AMDGPU: Consolidiate f16 med3 patterns (#97399)

Author: arsenm

llvm/lib/Target/AMDGPU/AMDGPU.td

@@ -2013,6 +2013,7 @@ def HasVOP3PInsts : Predicate<"Subtarget->hasVOP3PInsts()">,
   AssemblerPredicate<(all_of FeatureVOP3P)>;
 
 def NotHasMed3_16 : Predicate<"!Subtarget->hasMed3_16()">;
+def HasMed3_16 : Predicate<"Subtarget->hasMed3_16()">;
 
 def HasMinMaxDenormModes : Predicate<"Subtarget->supportsMinMaxDenormModes()">;
 def NotHasMinMaxDenormModes : Predicate<"!Subtarget->supportsMinMaxDenormModes()">;

llvm/lib/Target/AMDGPU/SIInstructions.td

@@ -3534,16 +3534,6 @@ multiclass FPMed3Pat<ValueType vt,
               DSTCLAMP.NONE, DSTOMOD.NONE)>;
 }
 
-class FP16Med3Pat<ValueType vt,
-                Instruction med3Inst> : GCNPat<
-  (fmaxnum_like_nnan (fminnum_like (VOP3Mods vt:$src0, i32:$src0_mods),
-                                   (VOP3Mods vt:$src1, i32:$src1_mods)),
-           (fminnum_like (fmaxnum_like (VOP3Mods vt:$src0, i32:$src0_mods),
-                                       (VOP3Mods vt:$src1, i32:$src1_mods)),
-                         (vt (VOP3Mods vt:$src2, i32:$src2_mods)))),
-  (med3Inst $src0_mods, $src0, $src1_mods, $src1, $src2_mods, $src2, DSTCLAMP.NONE)
->;
-
 multiclass Int16Med3Pat<Instruction med3Inst,
                         SDPatternOperator min,
                         SDPatternOperator max> {
@@ -3566,6 +3556,10 @@ multiclass Int16Med3Pat<Instruction med3Inst,
 
 defm : FPMed3Pat<f32, V_MED3_F32_e64>;
 
+let SubtargetPredicate = HasMed3_16 in {
+defm : FPMed3Pat<f16, V_MED3_F16_e64>;
+}
+
 class
 IntMinMaxPat<Instruction minmaxInst, SDPatternOperator min_or_max,
              SDPatternOperator max_or_min_oneuse> : AMDGPUPat <
@@ -3611,7 +3605,6 @@ def : FPMinCanonMaxPat<V_MAXMIN_F16_e64, f16, fminnum_like, fmaxnum_like_oneuse>
 }
 
 let OtherPredicates = [isGFX9Plus] in {
-def : FP16Med3Pat<f16, V_MED3_F16_e64>;
 defm : Int16Med3Pat<V_MED3_I16_e64, smin, smax>;
 defm : Int16Med3Pat<V_MED3_U16_e64, umin, umax>;
 } // End Predicates = [isGFX9Plus]