[flang-commits] [flang] [mlir] [Flang][MLIR] Add `!$omp unroll` and `omp.unroll_heuristic` (PR #144785)

[Michael Kruse via flang-commits]

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@@ -0,0 +1,39 @@
+! RUN: %flang_fc1 -emit-hlfir -fopenmp -fopenmp-version=51 -o - %s 2>&1 | FileCheck %s
+
+
+subroutine omp_unroll_heuristic01(lb, ub, inc)
+  integer res, i, lb, ub, inc
+
+  !$omp unroll
+  do i = lb, ub, inc
+    res = i
+  end do
+  !$omp end unroll
+
+end subroutine omp_unroll_heuristic01
+
+
+!CHECK-LABEL: func.func @_QPomp_unroll_heuristic01(
+!CHECK:      %c0_i32 = arith.constant 0 : i32
----------------
Meinersbur wrote:

This is not possible in MLIR: SSA value names are always automatically generated and cannot be user-provided. In this case there is a special handler for `arith.constant` that generates the name out of `c` (for constant), the value of the constant (`0`), and the type (`i32`). Without such a special handler, the value are just numbers. For values of type `omp.cli` I also defined such a special handler that generates names based on the nesting, see `NewCliOp::getAsmResultNames`.

https://github.com/llvm/llvm-project/pull/144785