public inbox for gcc-bugs@sourceware.org help / color / mirror / Atom feed
From: "hjl.tools at gmail dot com" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug target/67995] New: __attribute__ ((target("arch=XXX"))) enables unsupported ISA Date: Fri, 16 Oct 2015 18:33:00 -0000 [thread overview] Message-ID: <bug-67995-4@http.gcc.gnu.org/bugzilla/> (raw) https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67995 Bug ID: 67995 Summary: __attribute__ ((target("arch=XXX"))) enables unsupported ISA Product: gcc Version: 5.3.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: target Assignee: unassigned at gcc dot gnu.org Reporter: hjl.tools at gmail dot com Target Milestone: --- [hjl@gnu-6 pr67985]$ cat r.i unsigned int __attribute__ ((target("arch=core2"))) __x86_rdrand(void) { unsigned int retries = 100; unsigned int val; while (__builtin_ia32_rdrand32_step(&val) == 0) if (--retries == 0) return 0; return val; } [hjl@gnu-6 pr67985]$ /export/build/gnu/gcc-test/build-x86_64-linux/gcc/xgcc -B/export/build/gnu/gcc-test/build-x86_64-linux/gcc/ -O2 -march=haswell -S -o r.s r.i [hjl@gnu-6 pr67985]$ cat r.s .file "r.i" .text .p2align 4,,15 .globl __x86_rdrand .type __x86_rdrand, @function __x86_rdrand: .LFB0: .cfi_startproc movl $100, %eax movl $1, %ecx jmp .L2 .p2align 4 .L4: subl $1, %eax je .L8 .L2: rdrand %edx movl %edx, -4(%rsp) cmovc %ecx, %edx testl %edx, %edx je .L4 movl -4(%rsp), %eax .L8: ret .cfi_endproc .LFE0: .size __x86_rdrand, .-__x86_rdrand .ident "GCC: (GNU) 6.0.0 20151016 (experimental)" .section .note.GNU-stack,"",@progbits [hjl@gnu-6 pr67985]$ There should be a warning since rdrand isn't supported on Intel Core 2.
next reply other threads:[~2015-10-16 18:33 UTC|newest] Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top 2015-10-16 18:33 hjl.tools at gmail dot com [this message] 2015-10-16 18:56 ` [Bug target/67995] " hjl.tools at gmail dot com 2015-10-17 13:02 ` hjl.tools at gmail dot com 2015-10-19 11:18 ` hjl at gcc dot gnu.org 2015-10-19 11:46 ` hjl.tools at gmail dot com
Reply instructions: You may reply publicly to this message via plain-text email using any one of the following methods: * Save the following mbox file, import it into your mail client, and reply-to-all from there: mbox Avoid top-posting and favor interleaved quoting: https://en.wikipedia.org/wiki/Posting_style#Interleaved_style * Reply using the --to, --cc, and --in-reply-to switches of git-send-email(1): git send-email \ --in-reply-to=bug-67995-4@http.gcc.gnu.org/bugzilla/ \ --to=gcc-bugzilla@gcc.gnu.org \ --cc=gcc-bugs@gcc.gnu.org \ /path/to/YOUR_REPLY https://kernel.org/pub/software/scm/git/docs/git-send-email.html * If your mail client supports setting the In-Reply-To header via mailto: links, try the mailto: linkBe sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions for how to clone and mirror all data and code used for this inbox; as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).