[clang] [llvm] [mlir] [AMDGPU] add clamp immediate operand to WMMA iu8 intrinsic (PR #171069)

[Muhammad Abdul via cfe-commits]

================
@@ -1665,6 +1665,13 @@ Value *CodeGenFunction::EmitAMDGPUBuiltinExpr(unsigned 
BuiltinID,
     if (AppendFalseForOpselArg)
       Args.push_back(Builder.getFalse());
 
+    if (BuiltinID == AMDGPU::BI__builtin_amdgcn_wmma_i32_16x16x64_iu8) {
+      if (Args.size() == 7)
----------------
0xzre wrote:

Forcing an 8th arg immediately would break downstream code just as @arsenm 
mentioned here 
https://github.com/llvm/llvm-project/pull/171069#pullrequestreview-3552446843

Maybe what we need is to make clamp required later in a transition plan 🤔 

https://github.com/llvm/llvm-project/pull/171069
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