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Implement a float16 directive for assembling 16 bit IEEE 754 floating point numbers for the AArch64 assembler.
The syntax of the directive is:
.float16 <0-n decimal numbers>
e.g.
.float16 0.5
.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.
gas * config/tc-aarch64.c: Add float16 directive and add "Hh" to
acceptable float characters.
* 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.
This commit is contained in:
Barnaby Wilks
Nick Clifton
parent
a051e2f3e0
commit
b20d385926
@ -1,3 +1,13 @@
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2019-08-22 Barnaby Wilks <barnaby.wilks@arm.com>
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* config/tc-aarch64.c: Add float16 directive and add "Hh" to
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acceptable float characters.
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* doc/c-aarch64.texi: Documentation for float16 directive.
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* testsuite/gas/aarch64/float16-be.d: New test.
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* testsuite/gas/aarch64/float16-le.d: New test.
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* testsuite/gas/aarch64/float16.s: New test.
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* NEWS: Add NEWS entry.
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2019-08-22 Kyrylo Tkachov <kyrylo.tkachov@arm.com>
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* testsuite/gas/aarch64/sysreg-4.d: Update expected disassembly for
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13
gas/NEWS
13
gas/NEWS
@ -3,10 +3,10 @@
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* Add support for the Armv8.1-M Mainline and M-profile Vector Extension (MVE)
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instructions.
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* For MIPS, Add -m[no-]fix-loongson3-llsc option to fix (or not) Loongson3 LLSC
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Errata. Add a --enable-mips-fix-loongson3-llsc=[yes|no] configure time option
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to set the default behavior. Set the default if the configure option is not used
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to "no".
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* For MIPS, Add -m[no-]fix-loongson3-llsc option to fix (or not) Loongson3
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LLSC Errata. Add a --enable-mips-fix-loongson3-llsc=[yes|no] configure
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time option to set the default behavior. Set the default if the configure
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option is not used to "no".
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* Add support for the Arm Cortex-A76AE, Cortex-A77 and Cortex-M35P
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processors.
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@ -14,6 +14,11 @@
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* Add support for the AArch64 Cortex-A34, Cortex-A65, Cortex-A65AE,
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Cortex-A76AE, and Cortex-A77 processors.
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* Add .float16 directive for both Arm and AArch64 to allow encoding of 16-bit
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floating point literals. Add .float16_format directive and
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-mfp16-format=[ieee|alternative] option for Arm to control the format of the
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encoding.
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Changes in 2.32:
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* Add -mvexwig=[0|1] option to x86 assembler to control encoding of
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@ -529,7 +529,7 @@ const char EXP_CHARS[] = "eE";
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/* As in 0f12.456 */
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/* or 0d1.2345e12 */
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const char FLT_CHARS[] = "rRsSfFdDxXeEpP";
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const char FLT_CHARS[] = "rRsSfFdDxXeEpPhH";
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/* Prefix character that indicates the start of an immediate value. */
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#define is_immediate_prefix(C) ((C) == '#')
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@ -2106,6 +2106,7 @@ const pseudo_typeS md_pseudo_table[] = {
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{"dword", s_aarch64_elf_cons, 8},
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{"variant_pcs", s_variant_pcs, 0},
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#endif
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{"float16", float_cons, 'h'},
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{0, 0, 0}
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};
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@ -358,6 +358,14 @@ The @code{.even} directive aligns the output on the next even byte
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boundary.
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@c FFFFFFFFFFFFFFFFFFFFFFFFFF
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@cindex @code{.float16} directive, AArch64
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@item .float16 @var{value [,...,value_n]}
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Place the half precision floating point representation of one or more
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floating-point values into the current section.
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The format used to encode the floating point values is always the
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IEEE 754-2008 half precision floating point format.
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@c GGGGGGGGGGGGGGGGGGGGGGGGGG
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@c HHHHHHHHHHHHHHHHHHHHHHHHHH
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@c IIIIIIIIIIIIIIIIIIIIIIIIII
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11
gas/testsuite/gas/aarch64/float16-be.d
Normal file
11
gas/testsuite/gas/aarch64/float16-be.d
Normal file
@ -0,0 +1,11 @@
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# name: Big endian float16 literals (IEEE 754 format)
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# source: float16.s
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# objdump: -s --section=.data
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# as: -mbig-endian
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.*: +file format .*
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Contents of section \.data:
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0000 4a002fdf 1c197bff 000103ff 04003c00.*
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0010 3c017fff 7c00fc00 00008000 bc00bbe7.*
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0020 fbff4200 4a00603e.*
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11
gas/testsuite/gas/aarch64/float16-le.d
Normal file
11
gas/testsuite/gas/aarch64/float16-le.d
Normal file
@ -0,0 +1,11 @@
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# name: Little endian float16 literals (IEEE 754 format)
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# source: float16.s
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# objdump: -s --section=.data
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# as: -mlittle-endian
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.*: +file format .*
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Contents of section \.data:
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0000 004adf2f 191cff7b 0100ff03 0004003c.*
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0010 013cff7f 007c00fc 00000080 00bce7bb.*
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0020 fffb0042 004a3e60.*
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19
gas/testsuite/gas/aarch64/float16.s
Normal file
19
gas/testsuite/gas/aarch64/float16.s
Normal file
@ -0,0 +1,19 @@
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.data
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.float16 12.0
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.float16 0.123
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.float16 0.004
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.float16 65504
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.float16 5.9605e-8
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.float16 6.0976e-5
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.float16 6.1035e-5
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.float16 1
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.float16 1.001
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.float16 NaN
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.float16 +Inf
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.float16 -Inf
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.float16 +0
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.float16 -0
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.float16 -1
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.float16 -0.98765
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.float16 -65504
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.float16 3.0, 12.0, 543.123
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