[Mlir-commits] [mlir] [mlir][Vector] Teach how to materialize UB constant to Vector (PR #125596)

[Andrzej Warzyński]

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@@ -1255,8 +1255,8 @@ func.func @extract_poison_idx(%arg0: vector<16xf32>) -> f32 {
   return %0 : f32
 }
 // CHECK-LABEL: @extract_poison_idx
-//       CHECK:   %[[IDX:.*]] = llvm.mlir.constant(-1 : i64) : i64
-//       CHECK:   llvm.extractelement {{.*}}[%[[IDX]] : i64] : vector<16xf32>
+//       CHECK:   %[[UB:.*]] = ub.poison : f32
+//       CHECK:   return %[[UB]] : f32
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banach-space wrote:

Could you use this opportunity and rename:
*  `@extract_poison_idx`, as 
* `@extract_scalar_from_vec_1d_f32_poison_idx`

This way we would maintain consistent naming. 

Also, is there a test with poison idx when extracting form something rank > 1?

https://github.com/llvm/llvm-project/pull/125596