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VCVT between f16 and f32 is an Advanced SIMD instruction.
Not all the VCVT alternatives need neon, hence the check for neon is in
the encode function.
The check on neon for VCVT.f16.f32 (and vice versa) is missing.
vshcmd: > echo 'vcvt.f16.f32 d1, q1' | gas/as-new -mfpu=vfpxd -march=armv8.5-a -
testdir [15:59:10] $
Also, the handling of the condition code behaves differently to other
SIMD instructions -- no error message is produced when assembling an
instruction with a condition code suffix despite the arm encoding not
allowing a condition code. (n.b. the actual binary produced is
independent of the suffix).
The instruction should be treated similarly to VSUBL that has the same
caveat of "must be unconditional" describing the {<c>} symbol. vcvt
half-precision to single precision found in F6.1.58 in the ARM
Architecture Reference Manual issue C.a, vsubl found in F6.1.240 in
the ARM Architecture Reference Manual issue C.a
2018-11-06 Matthew Malcomson <matthew.malcomson@arm.com>
* config/tc-arm.c (do_neon_cvt_1): Add check for neon and condition
codes to half-precision conversion.
* testsuite/gas/arm/neon-cond-bad-inc.s: Check vcvteq disallowed.
* testsuite/gas/arm/neon-cond-bad.l: Likewise.
* testsuite/gas/arm/neon-cond-bad_t2.d: Check vcvteq allowed in IT
block.
* testsuite/gas/arm/vfp-bad.l: Ensure vcvt doesn't work without neon.
* testsuite/gas/arm/vfp-bad.s: Likewise.
README for GNU development tools This directory contains various GNU compilers, assemblers, linkers, debuggers, etc., plus their support routines, definitions, and documentation. If you are receiving this as part of a GDB release, see the file gdb/README. If with a binutils release, see binutils/README; if with a libg++ release, see libg++/README, etc. That'll give you info about this package -- supported targets, how to use it, how to report bugs, etc. It is now possible to automatically configure and build a variety of tools with one command. To build all of the tools contained herein, run the ``configure'' script here, e.g.: ./configure make To install them (by default in /usr/local/bin, /usr/local/lib, etc), then do: make install (If the configure script can't determine your type of computer, give it the name as an argument, for instance ``./configure sun4''. You can use the script ``config.sub'' to test whether a name is recognized; if it is, config.sub translates it to a triplet specifying CPU, vendor, and OS.) If you have more than one compiler on your system, it is often best to explicitly set CC in the environment before running configure, and to also set CC when running make. For example (assuming sh/bash/ksh): CC=gcc ./configure make A similar example using csh: setenv CC gcc ./configure make Much of the code and documentation enclosed is copyright by the Free Software Foundation, Inc. See the file COPYING or COPYING.LIB in the various directories, for a description of the GNU General Public License terms under which you can copy the files. REPORTING BUGS: Again, see gdb/README, binutils/README, etc., for info on where and how to report problems.