Re: [RFC][PATCH 1/2] lto: Fix streaming of loop->can_be_parallel [PR125717]

[Dhruv Chawla]

On 17/06/26 13:47, Richard Biener wrote:

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On Wed, Jun 17, 2026 at 8:26 AM <dhr...@nvidia.com> wrote:

From: Dhruv Chawla <dhr...@nvidia.com>

The can_be_parallel flag was not being streamed out, so any frontend
setting the flag (via annot_expr_parallel_kind) would not observe it doing
anything when LTO was enabled.

Bootstrapped and regtested on aarch64-linux-gnu.

OK.

Thanks, committed as r17-1612-g4cede4b0f48e07.

--
Regards,
Dhruv

Signed-off-by: Dhruv Chawla <dhr...@nvidia.com>

gcc/ChangeLog:

         PR fortran/125717
         * lto-streamer-in.cc (input_cfg): Stream loop->can_be_parallel in.
         * lto-streamer-out.cc (output_cfg): Stream loop->can_be_parallel out.
---
  gcc/lto-streamer-in.cc  | 1 +
  gcc/lto-streamer-out.cc | 1 +
  2 files changed, 2 insertions(+)

diff --git a/gcc/lto-streamer-in.cc b/gcc/lto-streamer-in.cc
index ee2fa2affbc..92f83ebbbb0 100644
--- a/gcc/lto-streamer-in.cc
+++ b/gcc/lto-streamer-in.cc
@@ -1140,6 +1140,7 @@ input_cfg (class lto_input_block *ib, class data_in 
*data_in,
        loop->dont_vectorize = streamer_read_hwi (ib);
        loop->force_vectorize = streamer_read_hwi (ib);
        loop->finite_p = streamer_read_hwi (ib);
+      loop->can_be_parallel = streamer_read_hwi (ib);
        loop->simduid = stream_read_tree (ib, data_in);

        place_new_loop (fn, loop);
diff --git a/gcc/lto-streamer-out.cc b/gcc/lto-streamer-out.cc
index f2feefc1532..87f9612b3d7 100644
--- a/gcc/lto-streamer-out.cc
+++ b/gcc/lto-streamer-out.cc
@@ -2220,6 +2220,7 @@ output_cfg (struct output_block *ob, struct function *fn)
        streamer_write_hwi (ob, loop->dont_vectorize);
        streamer_write_hwi (ob, loop->force_vectorize);
        streamer_write_hwi (ob, loop->finite_p);
+      streamer_write_hwi (ob, loop->can_be_parallel);
        stream_write_tree (ob, loop->simduid, true);
      }

--
2.43.0