Recent versions of Solaris/x86 as (based on Studio 12.6 fbe) support
AVX512 insns, but with a caveat as explained in as(1):
-xbrace_comment=yes
The assembler treats the text within the braces {} as comments. If
you want the text within braces to be treated as regular AVX512
instruction, place the text within double braces {{}}.
This was done for backwards compatibility reasons, it seems. To have
full compatiblity with gas syntax, one needs to pass
-xbrace_comment=no. The following patch checks if the assembler used
supports that option and passes it on if so.
Bootstrapped without regressions on i386-pc-solaris2.1[01]. Will
install shortly and backport to the gcc-7 and gcc-6 branches.
Rainer
--
-----------------------------------------------------------------------------
Rainer Orth, Center for Biotechnology, Bielefeld University
2016-12-16 Rainer Orth <r...@cebitec.uni-bielefeld.de>
* configure.ac (gcc_cv_as_ix86_xbrace_comment): Check if assembler
supports -xbrace_comment option.
* configure: Regenerate.
* config.in: Regenerate.
* config/i386/sol2.h (ASM_XBRACE_COMMENT_SPEC): Define.
(ASM_CPU_SPEC): Use it.
# HG changeset patch
# Parent bbb7e8e9e5d2b76cd92a4ae42703471b2a14f898
Use -xbrace_comment=no with recent Solaris/x86 as
diff --git a/gcc/config/i386/sol2.h b/gcc/config/i386/sol2.h
--- a/gcc/config/i386/sol2.h
+++ b/gcc/config/i386/sol2.h
@@ -65,8 +65,16 @@ along with GCC; see the file COPYING3.
#define ASM_CPU64_DEFAULT_SPEC "-xarch=generic64"
#endif
+/* Since Studio 12.6, as needs -xbrace_comment=no so its AVX512 syntax is
+ fully compatible with gas. */
+#ifdef HAVE_AS_XBRACE_COMMENT_OPTION
+#define ASM_XBRACE_COMMENT_SPEC "-xbrace_comment=no"
+#else
+#define ASM_XBRACE_COMMENT_SPEC ""
+#endif
+
#undef ASM_CPU_SPEC
-#define ASM_CPU_SPEC "%(asm_cpu_default)"
+#define ASM_CPU_SPEC "%(asm_cpu_default) " ASM_XBRACE_COMMENT_SPEC
/* Don't include ASM_PIC_SPEC. While the Solaris 10+ assembler accepts -K PIC,
it gives many warnings:
diff --git a/gcc/configure.ac b/gcc/configure.ac
--- a/gcc/configure.ac
+++ b/gcc/configure.ac
@@ -4033,6 +4033,11 @@ foo: nop
;;
esac
+ gcc_GAS_CHECK_FEATURE([-xbrace_comment], gcc_cv_as_ix86_xbrace_comment,,
+ [-xbrace_comment=no], [.text],,
+ [AC_DEFINE(HAVE_AS_XBRACE_COMMENT_OPTION, 1,
+ [Define if your assembler supports -xbrace_comment option.])])
+
# Test if the assembler supports the section flag 'e' for specifying
# an excluded section.
gcc_GAS_CHECK_FEATURE([.section with e], gcc_cv_as_section_has_e,
