[AMDGPU] Automate creation of byte_sel dags. NFCI. (#140155)

llvm/lib/Target/AMDGPU/SIInstrInfo.td

diff --git a/llvm/lib/Target/AMDGPU/SIInstrInfo.td b/llvm/lib/Target/AMDGPU/SIInstrInfo.td
index 47ee0a7..84a6aea 100644
--- a/llvm/lib/Target/AMDGPU/SIInstrInfo.td
+++ b/llvm/lib/Target/AMDGPU/SIInstrInfo.td
@@ -1293,6 +1293,7 @@
 def ByteSel : NamedIntOperand<"byte_sel"> {
   let Validator = "isUInt<2>";
 }
+def ByteSel0 : DefaultOperand<ByteSel, 0>;
 
 let PrintMethod = "printBitOp3" in
 def BitOp3 : NamedIntOperand<"bitop3">;
@@ -1971,7 +1972,8 @@
 class getIns64 <RegisterOperand Src0RC, RegisterOperand Src1RC,
                 RegisterOperand Src2RC, int NumSrcArgs,
                 bit HasClamp, bit HasModifiers, bit HasSrc2Mods, bit HasOMod,
-                Operand Src0Mod, Operand Src1Mod, Operand Src2Mod> {
+                Operand Src0Mod, Operand Src1Mod, Operand Src2Mod,
+                bit HasFP8ByteSel = 0, bit HasFP8DstByteSel = 0> {
   dag src0 = !if(!ge(NumSrcArgs, 1),
                  !if (HasModifiers,
                       (ins Src0Mod:$src0_modifiers, Src0RC:$src0),
@@ -1987,20 +1989,29 @@
                       (ins Src2Mod:$src2_modifiers, Src2RC:$src2),
                       (ins Src2RC:$src2)),
                  (ins));
-  dag clamp = !if(HasClamp, (ins Clamp0:$clamp), (ins));
+  // If there is vdst_in after clamp with HasFP8DstByteSel we cannot use
+  // Clamp0 with default value, all default operands must be at the end.
+  dag clamp = !if(HasClamp, !if(HasFP8DstByteSel, (ins Clamp:$clamp),
+                                                  (ins Clamp0:$clamp)),
+                            (ins));
   dag omod = !if(HasOMod, (ins omod0:$omod), (ins));
+  dag bytesel = !if(HasFP8ByteSel,
+                    !con(!if(HasFP8DstByteSel, (ins VGPR_32:$vdst_in), (ins)),
+                         (ins ByteSel0:$byte_sel)),
+                    (ins));
 
-  dag ret = !con(src0, src1, src2, clamp, omod);
+  dag ret = !con(src0, src1, src2, clamp, omod, bytesel);
 }
 
 class getInsVOP3Base<RegisterOperand Src0RC, RegisterOperand Src1RC,
                 RegisterOperand Src2RC, int NumSrcArgs,
                 bit HasClamp, bit HasModifiers, bit HasSrc2Mods, bit HasOMod,
-                Operand Src0Mod, Operand Src1Mod, Operand Src2Mod, bit HasOpSel> {
+                Operand Src0Mod, Operand Src1Mod, Operand Src2Mod, bit HasOpSel,
+                bit HasFP8ByteSel = 0, bit HasFP8DstByteSel = 0> {
   // getInst64 handles clamp and omod. implicit mutex between vop3p and omod
   dag base = getIns64 <Src0RC, Src1RC, Src2RC, NumSrcArgs,
                 HasClamp, HasModifiers, HasSrc2Mods, HasOMod,
-                Src0Mod, Src1Mod, Src2Mod>.ret;
+                Src0Mod, Src1Mod, Src2Mod, HasFP8ByteSel, HasFP8DstByteSel>.ret;
   dag opsel = (ins op_sel0:$op_sel);
   dag ret = !con(base, !if(HasOpSel, opsel, (ins)));
 }
@@ -2612,7 +2623,8 @@
   field dag Ins32 = getIns32<Src0RC32, Src1RC32, NumSrcArgs>.ret;
   field dag Ins64 = getIns64<Src0RC64, Src1RC64, Src2RC64, NumSrcArgs,
                              HasClamp, HasModifiers, HasSrc2Mods,
-                             HasOMod, Src0Mod, Src1Mod, Src2Mod>.ret;
+                             HasOMod, Src0Mod, Src1Mod, Src2Mod,
+                             HasFP8ByteSel, HasFP8DstByteSel>.ret;
   field dag InsVOP3P = getInsVOP3P<Src0RC64, Src1RC64, Src2RC64,
                                    NumSrcArgs, HasClamp, HasOpSel, HasNeg,
                                    Src0PackedMod, Src1PackedMod, Src2PackedMod>.ret;
@@ -2630,7 +2642,8 @@
                                  Src0ModDPP, Src1ModDPP, Src2ModDPP>.ret;
   defvar InsVOP3DPPBase = getInsVOP3Base<Src0VOP3DPP, Src1VOP3DPP,
                   Src2VOP3DPP, NumSrcArgs, HasClamp, HasModifiers, HasSrc2Mods, HasOMod,
-                  Src0ModVOP3DPP, Src1ModVOP3DPP, Src2ModVOP3DPP, HasOpSel>.ret;
+                  Src0ModVOP3DPP, Src1ModVOP3DPP, Src2ModVOP3DPP, HasOpSel,
+                  HasFP8ByteSel, HasFP8DstByteSel>.ret;
   defvar InsVOP3PDPPBase = getInsVOP3P<Src0VOP3DPP, Src1VOP3DPP,
                   Src2VOP3DPP, NumSrcArgs, HasClamp, HasOpSel, HasNeg,
                   Src0ModVOP3DPP, Src1ModVOP3DPP, Src2ModVOP3DPP>.ret;

llvm/lib/Target/AMDGPU/VOP1Instructions.td

diff --git a/llvm/lib/Target/AMDGPU/VOP1Instructions.td b/llvm/lib/Target/AMDGPU/VOP1Instructions.td
index f885de3..7fdd951 100644
--- a/llvm/lib/Target/AMDGPU/VOP1Instructions.td
+++ b/llvm/lib/Target/AMDGPU/VOP1Instructions.td
@@ -674,17 +674,6 @@
   let HasClamp = 0;
   let HasOMod = 0;
   let HasModifiers = 0;
-
-  defvar bytesel = (ins ByteSel:$byte_sel);
-  let Ins64 = !con(getIns64<Src0RC64, Src1RC64, Src2RC64, NumSrcArgs,
-                            HasClamp, HasModifiers, HasSrc2Mods,
-                            HasOMod, Src0Mod, Src1Mod, Src2Mod>.ret,
-                   bytesel);
-  let InsVOP3Base = !con(getInsVOP3Base<Src0VOP3DPP, Src1VOP3DPP, Src2VOP3DPP,
-                                        NumSrcArgs, HasClamp, HasModifiers, HasSrc2Mods,
-                                        HasOMod, Src0ModVOP3DPP, Src1ModVOP3DPP,
-                                        Src2ModVOP3DPP, HasOpSel>.ret,
-                         bytesel);
 }
 
 let SubtargetPredicate = isGFX12Plus, OtherPredicates = [HasFP8ConversionInsts],

llvm/lib/Target/AMDGPU/VOP3Instructions.td

diff --git a/llvm/lib/Target/AMDGPU/VOP3Instructions.td b/llvm/lib/Target/AMDGPU/VOP3Instructions.td
index a7b90b9..0252c4f 100644
--- a/llvm/lib/Target/AMDGPU/VOP3Instructions.td
+++ b/llvm/lib/Target/AMDGPU/VOP3Instructions.td
@@ -593,6 +593,7 @@
   let HasExtVOP3DPP = 1;
   let HasOpSel = 1;
   let HasFP8DstByteSel = 1;
+  let HasFP8ByteSel = 0; // It works as a dst-bytesel, but does not have byte_sel operand.
   let AsmVOP3OpSel = !subst(", $src2_modifiers", "",
                             getAsmVOP3OpSel<3, HasClamp, HasOMod,
                                             HasSrc0FloatMods, HasSrc1FloatMods,
@@ -607,16 +608,6 @@
   VOP3_Profile<VOPProfile<[i32, SrcVT, i32, untyped]>> {
   let HasFP8DstByteSel = 1;
   let HasClamp = 0;
-  defvar bytesel = (ins VGPR_32:$vdst_in, ByteSel:$byte_sel);
-  let Ins64 = !con(getIns64<Src0RC64, Src1RC64, Src2RC64, NumSrcArgs,
-                            HasClamp, HasModifiers, HasSrc2Mods,
-                            HasOMod, Src0Mod, Src1Mod, Src2Mod>.ret,
-                   bytesel);
-  let InsVOP3Base = !con(
-    getInsVOP3Base<Src0VOP3DPP, Src1VOP3DPP,
-                   Src2VOP3DPP, NumSrcArgs, HasClamp, HasModifiers, HasSrc2Mods, HasOMod,
-                   Src0ModVOP3DPP, Src1ModVOP3DPP, Src2ModVOP3DPP, HasOpSel>.ret,
-    bytesel);
 }
 
 def IsPow2Plus1: PatLeaf<(i32 imm), [{