[clang] [llvm] [AMDGPU] Add builtins for wave reduction intrinsics (PR #127013)

[via llvm-commits]

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@@ -277,16 +277,31 @@ def : GCNPat <(vt (int_amdgcn_set_inactive vt:$src, vt:$inactive)),
 def : GCNPat<(i32 (int_amdgcn_set_inactive_chain_arg i32:$src, i32:$inactive)),
     (V_SET_INACTIVE_B32 0, VGPR_32:$src, 0, VGPR_32:$inactive, (IMPLICIT_DEF))>;
 
-let usesCustomInserter = 1, hasSideEffects = 0, mayLoad = 0, mayStore = 0, Uses = [EXEC] in {
-  def WAVE_REDUCE_UMIN_PSEUDO_U32 : VPseudoInstSI <(outs SGPR_32:$sdst),
-    (ins VSrc_b32: $src, VSrc_b32:$strategy),
-    [(set i32:$sdst, (int_amdgcn_wave_reduce_umin i32:$src, i32:$strategy))]> {
+// clang-format off
+defvar int_amdgcn_wave_reduce_ = "int_amdgcn_wave_reduce_";
+multiclass
+    AMDGPUWaveReducePseudoGenerator<string Op, string DataType, string Size> {
+  let usesCustomInserter = 1, hasSideEffects = 0, mayLoad = 0, mayStore = 0, Uses = [EXEC] in {
+    def !toupper(Op) #"_PSEUDO_" #DataType #Size
+        : VPseudoInstSI<(outs SGPR_32 : $sdst),
+                        (ins VSrc_b32 : $src, VSrc_b32 : $strategy),
+                        [(set i32 : $sdst, (!cast<AMDGPUWaveReduce>(int_amdgcn_wave_reduce_ #Op) i32 : $src, i32 : $strategy))]> {}
   }
+}
+// clang-format on
----------------
easyonaadit wrote:

tablegen has started getting formatted by `clang-format`.
This was getting tedious to read, so I put this in.

https://github.com/llvm/llvm-project/pull/127013