From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 2140) id CD18C3858031; Thu, 9 Dec 2021 05:05:33 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org CD18C3858031 Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit From: Alexandre Oliva To: gcc-cvs@gcc.gnu.org Subject: [gcc(refs/users/aoliva/heads/testme)] [PR100843] store by mult pieces: punt on max_len < min_len X-Act-Checkin: gcc X-Git-Author: Alexandre Oliva X-Git-Refname: refs/users/aoliva/heads/testme X-Git-Oldrev: af93386ffc18ca6c7d1949751ff97cc6ce092b2c X-Git-Newrev: 0709212ebe9f91ed686f2a5ea1ccfceba175fe53 Message-Id: <20211209050533.CD18C3858031@sourceware.org> Date: Thu, 9 Dec 2021 05:05:33 +0000 (GMT) X-BeenThere: gcc-cvs@gcc.gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Gcc-cvs mailing list List-Unsubscribe: , List-Archive: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 09 Dec 2021 05:05:33 -0000 https://gcc.gnu.org/g:0709212ebe9f91ed686f2a5ea1ccfceba175fe53 commit 0709212ebe9f91ed686f2a5ea1ccfceba175fe53 Author: Alexandre Oliva Date: Thu Dec 9 01:44:17 2021 -0300 [PR100843] store by mult pieces: punt on max_len < min_len Diff: --- gcc/builtins.c | 3 ++- gcc/testsuite/gcc.dg/pr100843.c | 8 ++++++++ 2 files changed, 10 insertions(+), 1 deletion(-) diff --git a/gcc/builtins.c b/gcc/builtins.c index 03829c03a5a..304d87dafb7 100644 --- a/gcc/builtins.c +++ b/gcc/builtins.c @@ -3963,7 +3963,8 @@ try_store_by_multiple_pieces (rtx to, rtx len, unsigned int ctz_len, else if (max_len == min_len) blksize = max_len; else - gcc_unreachable (); + /* Huh, max_len < min_len? Punt. See pr100843.c. */ + return false; if (min_len >= blksize) { min_len -= blksize; diff --git a/gcc/testsuite/gcc.dg/pr100843.c b/gcc/testsuite/gcc.dg/pr100843.c new file mode 100644 index 00000000000..695a2ec3f68 --- /dev/null +++ b/gcc/testsuite/gcc.dg/pr100843.c @@ -0,0 +1,8 @@ +/* { dg-do compile } */ +/* { dg-options "-O1 -w" } */ + +char c; +void *memset(); +void test_integer_conversion_memset(void *d) { + memset(d, '\0', c); +}