[{"id":3678656,"web_url":"http://patchwork.ozlabs.org/comment/3678656/","msgid":"","list_archive_url":null,"date":"2026-04-17T10:41:59","subject":"RE: [PATCH] vect: fix vectorization of non-gather elementwise loads:\n Unrestrict test cases [PR124037]","submitter":{"id":69689,"url":"http://patchwork.ozlabs.org/api/people/69689/","name":"Tamar Christina","email":"Tamar.Christina@arm.com"},"content":"> -----Original Message-----\n> From: Thomas Schwinge \n> Sent: 17 April 2026 09:47\n> To: Victor Do Nascimento ;\n> rdapp.gcc@gmail.com; Tamar Christina ;\n> rguenther@suse.de; gcc-patches@gcc.gnu.org\n> Subject: [PATCH] vect: fix vectorization of non-gather elementwise loads:\n> Unrestrict test cases [PR124037]\n> \n> Contrary to an earlier revision of them, in my understanding, the test cases\n> 'g++.dg/vect/vect-pr124037.cc', 'gcc.dg/vect/vect-pr124037.c' as added in\n> commit 4a30b45ffe3cb4ad2e35d73f1714f1a80e32edd7\n> \"vect: fix vectorization of non-gather elementwise loads [PR124037]\"\n> are no longer specific to early break vectorization, and the C++ one also\n> doesn't use 'mmap'.\n> \n\nThey're still early break related in that they are uncounted loops.\ni.e. in the C one the \"if (ptr->flag == 0)\" requires early break and the C++\none for (; ArgPtr->isNot(0); ++ArgPtr) needs early break too.\n\nThat said the guard on early break is indeed not needed as you say as with or\nWithout early break they shouldn't vectorize.\n\n> \tPR tree-optimization/124037\n> \tgcc/testsuite/\n> \t* g++.dg/vect/vect-pr124037.cc: Unrestrict.\n> \t* gcc.dg/vect/vect-pr124037.c: Likewise.\n> ---\n\nSo OK for trunk.\n\n> \n> Also, given that these are execution test cases, shouldn't they verify\n> what they compute, instead of just 'printf'ing?\n> \n\nThe C one uses mmap to add a protected page to see that the access\ndoesn't cross the page when it shouldn't. It doesn't compute anything\nit just checks pointer accesses.\n\nBut It's not immediately clear to me what the C++ one is checking and\ndoes seem to miss a result check.\n\nThanks,\nTamar\n\n> ---\n> gcc/testsuite/g++.dg/vect/vect-pr124037.cc | 2 --\n> gcc/testsuite/gcc.dg/vect/vect-pr124037.c | 2 +-\n> 2 files changed, 1 insertion(+), 3 deletions(-)\n> \n> diff --git a/gcc/testsuite/g++.dg/vect/vect-pr124037.cc\n> b/gcc/testsuite/g++.dg/vect/vect-pr124037.cc\n> index e25ba02ec9b0..d346871be7e3 100644\n> --- a/gcc/testsuite/g++.dg/vect/vect-pr124037.cc\n> +++ b/gcc/testsuite/g++.dg/vect/vect-pr124037.cc\n> @@ -1,6 +1,4 @@\n> /* PR tree-optimization/124037 */\n> -/* { dg-require-effective-target mmap } */\n> -/* { dg-require-effective-target vect_early_break } */\n> /* { dg-additional-options \"-std=c++11\" } */\n> \n> struct Token\n> diff --git a/gcc/testsuite/gcc.dg/vect/vect-pr124037.c\n> b/gcc/testsuite/gcc.dg/vect/vect-pr124037.c\n> index 3954e23f4566..f805d93ee898 100644\n> --- a/gcc/testsuite/gcc.dg/vect/vect-pr124037.c\n> +++ b/gcc/testsuite/gcc.dg/vect/vect-pr124037.c\n> @@ -1,6 +1,6 @@\n> /* PR tree-optimization/124037 */\n> /* { dg-require-effective-target mmap } */\n> -/* { dg-require-effective-target vect_early_break } */\n> +\n> #include \n> #include \n> #include \n> --\n> 2.34.1","headers":{"Return-Path":"","X-Original-To":["incoming@patchwork.ozlabs.org","gcc-patches@gcc.gnu.org"],"Delivered-To":["patchwork-incoming@legolas.ozlabs.org","gcc-patches@gcc.gnu.org"],"Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (1024-bit key;\n unprotected) header.d=arm.com header.i=@arm.com header.a=rsa-sha256\n header.s=selector1 header.b=UDnWg6Ag;\n\tdkim=pass (1024-bit key) header.d=arm.com header.i=@arm.com\n header.a=rsa-sha256 header.s=selector1 header.b=UDnWg6Ag;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=gcc.gnu.org\n (client-ip=38.145.34.32; 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