Add -mevexrcig={rne|rd|ru|rz} option to x86 assembler.

It is used to control which value is encoded in rounding control bits
for SAE-only EVEX instructions.

gas/
	* config/tc-i386.c (evexrcig): New.
	(build_evex_prefix): Force rounding bits.
	(OPTION_MEVEXRCIG): New.
	(md_longopts): Add mevexrcig.
	(md_parse_option): Handle OPTION_MEVEXRCIG.
	(md_show_usage): Document mevexrcig.
	* doc/c-i386.texi (mevexrcig): Document new option.

gas/testsuite/
	* gas/i386/avx512dq-rcig.s: New.
	* gas/i386/avx512dq-rcigrd-intel.d: Likewise.
	* gas/i386/avx512dq-rcigrd.d: Likewise.
	* gas/i386/avx512dq-rcigrne-intel.d: Likewise.
	* gas/i386/avx512dq-rcigrne.d: Likewise.
	* gas/i386/avx512dq-rcigru-intel.d: Likewise.
	* gas/i386/avx512dq-rcigru.d: Likewise.
	* gas/i386/avx512dq-rcigrz-intel.d: Likewise.
	* gas/i386/avx512dq-rcigrz.d: Likewise.
	* gas/i386/avx512er-rcig.s: Likewise.
	* gas/i386/avx512er-rcigrd-intel.d: Likewise.
	* gas/i386/avx512er-rcigrd.d: Likewise.
	* gas/i386/avx512er-rcigrne-intel.d: Likewise.
	* gas/i386/avx512er-rcigrne.d: Likewise.
	* gas/i386/avx512er-rcigru-intel.d: Likewise.
	* gas/i386/avx512er-rcigru.d: Likewise.
	* gas/i386/avx512er-rcigrz-intel.d: Likewise.
	* gas/i386/avx512er-rcigrz.d: Likewise.
	* gas/i386/avx512f-rcig.s: Likewise.
	* gas/i386/avx512f-rcigrd-intel.d: Likewise.
	* gas/i386/avx512f-rcigrd.d: Likewise.
	* gas/i386/avx512f-rcigrne-intel.d: Likewise.
	* gas/i386/avx512f-rcigrne.d: Likewise.
	* gas/i386/avx512f-rcigru-intel.d: Likewise.
	* gas/i386/avx512f-rcigru.d: Likewise.
	* gas/i386/avx512f-rcigrz-intel.d: Likewise.
	* gas/i386/avx512f-rcigrz.d: Likewise.
	* gas/i386/x86-64-avx512dq-rcig.s: Likewise.
	* gas/i386/x86-64-avx512dq-rcigrd-intel.d: Likewise.
	* gas/i386/x86-64-avx512dq-rcigrd.d: Likewise.
	* gas/i386/x86-64-avx512dq-rcigrne-intel.d: Likewise.
	* gas/i386/x86-64-avx512dq-rcigrne.d: Likewise.
	* gas/i386/x86-64-avx512dq-rcigru-intel.d: Likewise.
	* gas/i386/x86-64-avx512dq-rcigru.d: Likewise.
	* gas/i386/x86-64-avx512dq-rcigrz-intel.d: Likewise.
	* gas/i386/x86-64-avx512dq-rcigrz.d: Likewise.
	* gas/i386/x86-64-avx512er-rcig.s: Likewise.
	* gas/i386/x86-64-avx512er-rcigrd-intel.d: Likewise.
	* gas/i386/x86-64-avx512er-rcigrd.d: Likewise.
	* gas/i386/x86-64-avx512er-rcigrne-intel.d: Likewise.
	* gas/i386/x86-64-avx512er-rcigrne.d: Likewise.
	* gas/i386/x86-64-avx512er-rcigru-intel.d: Likewise.
	* gas/i386/x86-64-avx512er-rcigru.d: Likewise.
	* gas/i386/x86-64-avx512er-rcigrz-intel.d: Likewise.
	* gas/i386/x86-64-avx512er-rcigrz.d: Likewise.
	* gas/i386/x86-64-avx512f-rcig.s: Likewise.
	* gas/i386/x86-64-avx512f-rcigrd-intel.d: Likewise.
	* gas/i386/x86-64-avx512f-rcigrd.d: Likewise.
	* gas/i386/x86-64-avx512f-rcigrne-intel.d: Likewise.
	* gas/i386/x86-64-avx512f-rcigrne.d: Likewise.
	* gas/i386/x86-64-avx512f-rcigru-intel.d: Likewise.
	* gas/i386/x86-64-avx512f-rcigru.d: Likewise.
	* gas/i386/x86-64-avx512f-rcigrz-intel.d: Likewise.
	* gas/i386/x86-64-avx512f-rcigrz.d: Likewise.
	* gas/i386/i386.exp: Run new tests.

1 files changed, 13 insertions, 0 deletions

diff --git a/gas/doc/c-i386.texi b/gas/doc/c-i386.texi
index 0c2e134..75cd6b1 100644
--- a/gas/doc/c-i386.texi
+++ b/gas/doc/c-i386.texi
@@ -303,6 +303,19 @@ single-thread computers
 @option{-momit-lock-prefix=@var{no}} will encode lock prefix as usual,
 which is the default.
 
+@cindex @samp{-mevexrcig=} option, i386
+@cindex @samp{-mevexrcig=} option, x86-64
+@item -mevexrcig=@var{rne}
+@itemx -mevexrcig=@var{rd}
+@itemx -mevexrcig=@var{ru}
+@itemx -mevexrcig=@var{rz}
+These options control how the assembler should encode SAE-only
+EVEX instructions.  @option{-mevexrcig=@var{rne}} will encode RC bits
+of EVEX instruction with 00, which is the default.
+@option{-mevexrcig=@var{rd}}, @option{-mevexrcig=@var{ru}}
+and @option{-mevexrcig=@var{rz}} will encode SAE-only EVEX instructions
+with 01, 10 and 11 RC bits, respectively.
+
 @end table
 @c man end