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GET /api/1.1/patches/2231931/?format=api
HTTP 200 OK
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Content-Type: application/json
Vary: Accept

{
    "id": 2231931,
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    "date": "2026-05-01T15:32:47",
    "name": "[v2] forwprop: allow more VPEs in simplify_vector_constructor () [PR122679]",
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        "name": "Artemiy Volkov",
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        ],
        "From": "Artemiy Volkov <artemiy.volkov@arm.com>",
        "To": "<gcc-patches@gcc.gnu.org>",
        "CC": "<rguenther@suse.de>, <andrew.pinski@oss.qualcomm.com>,\n <christophe.lyon@arm.com>, Artemiy Volkov <artemiy.volkov@arm.com>",
        "Subject": "[PATCH v2] forwprop: allow more VPEs in simplify_vector_constructor\n () [PR122679]",
        "Date": "Fri, 1 May 2026 15:32:47 +0000",
        "Message-ID": "<20260501153302.2595141-1-artemiy.volkov@arm.com>",
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    "content": "Hi,\n\nrespinning\nhttps://gcc.gnu.org/pipermail/gcc-patches/2026-January/706444.html with\nsubconditions of the new if statements reordered, so that the cheaper\ncheck is performed first.  OK for trunk?\n\nThanks,\nArtemiy\n\n------------------------>8---------------------\n\nCurrently, simplify_vector_constructor () tries to rewrite a CONSTRUCTOR\nexpression into a VEC_PERM_EXPR, as long as constructor elements all come\nfrom 1 or 2 source vectors.  While doing so, it protects against creating\nVEC_PERM_EXPRs unsupported by the target by calling can_vec_perm_const_p\n() before enacting the transformation and bailing when that returns false.\n\nHowever, we can instead allow those VEC_PERM_EXPRs to be created if we\nknow that a later vector lowering pass will legitimize them for us.  IOW,\nonly if the target doesn't support the resulting permute and the\nPROP_gimple_lvec property is already set, do we give up.  This patch\ninserts the required checks.\n\nThis also allows us to remove the unnecessary vect_int requirement\n(wrongly added in r16-5244-g5a2319b71e4d30) from forwprop-43.c.\n\n(Re-)regtested on aarch64, arm, and x86_64.\n\n\tPR tree-optimization/112679\n\ngcc/ChangeLog:\n\n\t* tree-ssa-forwprop.cc (simplify_vector_constructor): Check the\n\tPROP_gimple_lvec property before returning false.\n\ngcc/testsuite/ChangeLog:\n\n\t* gcc.dg/tree-ssa/forwprop-43.c: Remove the vect_int check.\n---\n gcc/testsuite/gcc.dg/tree-ssa/forwprop-43.c | 1 -\n gcc/tree-ssa-forwprop.cc                    | 6 ++++--\n 2 files changed, 4 insertions(+), 3 deletions(-)",
    "diff": "diff --git a/gcc/testsuite/gcc.dg/tree-ssa/forwprop-43.c b/gcc/testsuite/gcc.dg/tree-ssa/forwprop-43.c\nindex b144687261b..b7d069bb5b6 100644\n--- a/gcc/testsuite/gcc.dg/tree-ssa/forwprop-43.c\n+++ b/gcc/testsuite/gcc.dg/tree-ssa/forwprop-43.c\n@@ -1,7 +1,6 @@\n /* { dg-do compile } */\n /* { dg-options \"-O2 -fdump-tree-forwprop1 -Wno-psabi\" } */\n /* { dg-require-effective-target stdint_types } */\n-/* { dg-require-effective-target vect_int } */\n /* { dg-additional-options \"-fgimple\" } */\n /* { dg-additional-options \"-msse2\" { target ia32 } } */\n \ndiff --git a/gcc/tree-ssa-forwprop.cc b/gcc/tree-ssa-forwprop.cc\nindex f060275d72d..18b9221908b 100644\n--- a/gcc/tree-ssa-forwprop.cc\n+++ b/gcc/tree-ssa-forwprop.cc\n@@ -4246,7 +4246,8 @@ simplify_vector_constructor (gimple_stmt_iterator *gsi)\n \t\t\t   ? 0 : refnelts) + i);\n       vec_perm_indices indices (sel, orig[1] ? 2 : 1, refnelts);\n       machine_mode vmode = TYPE_MODE (perm_type);\n-      if (!can_vec_perm_const_p (vmode, vmode, indices))\n+      if ((cfun->curr_properties & PROP_gimple_lvec)\n+\t  && !can_vec_perm_const_p (vmode, vmode, indices))\n \treturn false;\n       mask_type = build_vector_type (ssizetype, refnelts);\n       tree op2 = vec_perm_indices_to_tree (mask_type, indices);\n@@ -4311,7 +4312,8 @@ simplify_vector_constructor (gimple_stmt_iterator *gsi)\n \t\t\t    ? elts[i].second + nelts : i);\n \t  vec_perm_indices indices (sel, 2, nelts);\n \t  machine_mode vmode = TYPE_MODE (type);\n-\t  if (!can_vec_perm_const_p (vmode, vmode, indices))\n+\t  if ((cfun->curr_properties & PROP_gimple_lvec)\n+\t      && !can_vec_perm_const_p (vmode, vmode, indices))\n \t    return false;\n \t  mask_type = build_vector_type (ssizetype, nelts);\n \t  blend_op2 = vec_perm_indices_to_tree (mask_type, indices);\n",
    "prefixes": [
        "v2"
    ]
}