[PATCH][binutils][AArch64][3/3] Add support for float16 (IEEE format) for AArch64 backend.
Thu Aug 8 16:28:00 GMT 2019
This is an updated patch to include documentation and a NEWS entry for this patch series. (The original patch
is here https://sourceware.org/ml/binutils/2019-07/msg00117.html).
This is part of a patch series that implements a directive for assembling 16-bit floating point constants for Arm and AArch64.
This patch includes a NEWS entry that covers the changes made in this AArch64 patch and the previous Arm patch.
This patch implements a float16 directive for assembling 16 bit IEEE 754 floating point numbers
The syntax of the directive is:
.float16 <0-n decimal numbers>
.float16 10.2, NaN, 452.09
The floats will always be encoded using the binary16 format as described in the
IEEE 754-2008 standard. There is no need to support Arm's alternative half-precision
format since AArch64 only supports the IEEE format.
Added testcases to verify the correct encoding (for big and little endian targets) and cross-referenced the encodings with
GCC's __fp16 type to ensure consistency.
Cross compiled and regtested on aarch64-none-elf and aarch64-none-linux-gnu with no issues.
I don't have write access, so if it's OK then could someone commit on my behalf?
2019-08-01 Barnaby Wilks <firstname.lastname@example.org>
* config/tc-aarch64.c: Add float16 directive and add "Hh" to acceptable float
* doc/c-aarch64.texi: Documentation for float16 directive.
* testsuite/gas/aarch64/float16-be.d: New test.
* testsuite/gas/aarch64/float16-le.d: New test.
* testsuite/gas/aarch64/float16.s: New test.
* NEWS: Add NEWS entry.
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