122 lines
4.5 KiB
Diff
122 lines
4.5 KiB
Diff
From 7d19d096292acac01d0fde4d99c3e49d69688e03 Mon Sep 17 00:00:00 2001
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From: Jan Beulich <jbeulich@suse.com>
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Date: Wed, 11 Aug 2021 08:32:54 +0200
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Subject: [PATCH] x86: introduce .hfloat directive
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This is to be able to generate data passed to {,V}CVTPH2PS and acted
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upon by AVX512-FP16 insns. To be able to also use the hex forms
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supported for other floating point formats, a small addition to the
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generic hex_float() is needed.
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Extend existing x86 testcases.
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diff --git a/gas/config/tc-i386.c b/gas/config/tc-i386.c
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index 0fa8b0d5a04..a9e36213390 100644
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--- a/gas/config/tc-i386.c
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+++ b/gas/config/tc-i386.c
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@@ -512,7 +512,7 @@ const char EXP_CHARS[] = "eE";
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/* Chars that mean this number is a floating point constant
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As in 0f12.456
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or 0d1.2345e12. */
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-const char FLT_CHARS[] = "fFdDxX";
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+const char FLT_CHARS[] = "fFdDxXhH";
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/* Tables for lexical analysis. */
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static char mnemonic_chars[256];
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@@ -1356,6 +1356,7 @@ const pseudo_typeS md_pseudo_table[] =
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{"ffloat", float_cons, 'f'},
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{"dfloat", float_cons, 'd'},
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{"tfloat", float_cons, 'x'},
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+ {"hfloat", float_cons, 'h'},
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{"value", cons, 2},
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{"slong", signed_cons, 4},
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{"noopt", s_ignore, 0},
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diff --git a/gas/doc/c-i386.texi b/gas/doc/c-i386.texi
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index 9058ad444b0..664237c75c9 100644
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--- a/gas/doc/c-i386.texi
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+++ b/gas/doc/c-i386.texi
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@@ -1313,18 +1313,21 @@ data type. Constructors build these data types into memory.
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@cindex @code{single} directive, i386
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@cindex @code{double} directive, i386
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@cindex @code{tfloat} directive, i386
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+@cindex @code{hfloat} directive, i386
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@cindex @code{float} directive, x86-64
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@cindex @code{single} directive, x86-64
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@cindex @code{double} directive, x86-64
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@cindex @code{tfloat} directive, x86-64
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+@cindex @code{hfloat} directive, x86-64
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@itemize @bullet
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@item
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Floating point constructors are @samp{.float} or @samp{.single},
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-@samp{.double}, and @samp{.tfloat} for 32-, 64-, and 80-bit formats.
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-These correspond to instruction mnemonic suffixes @samp{s}, @samp{l},
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-and @samp{t}. @samp{t} stands for 80-bit (ten byte) real. The 80387
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-only supports this format via the @samp{fldt} (load 80-bit real to stack
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-top) and @samp{fstpt} (store 80-bit real and pop stack) instructions.
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+@samp{.double}, @samp{.tfloat}, and @samp{.hfloat} for 32-, 64-, 80-, and
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+16-bit formats respectively. The former three correspond to instruction
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+mnemonic suffixes @samp{s}, @samp{l}, and @samp{t}. @samp{t} stands for
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+80-bit (ten byte) real. The 80387 only supports this format via the
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+@samp{fldt} (load 80-bit real to stack top) and @samp{fstpt} (store 80-bit
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+real and pop stack) instructions.
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@cindex @code{word} directive, i386
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@cindex @code{long} directive, i386
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diff --git a/gas/read.c b/gas/read.c
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index b8e845dd569..4170a254030 100644
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--- a/gas/read.c
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+++ b/gas/read.c
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@@ -4852,6 +4852,11 @@ hex_float (int float_type, char *bytes)
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switch (float_type)
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{
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+ case 'h':
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+ case 'H':
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+ length = 2;
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+ break;
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+
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case 'f':
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case 'F':
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case 's':
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diff --git a/gas/testsuite/gas/i386/fp-elf32.d b/gas/testsuite/gas/i386/fp-elf32.d
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index eefe84db310..d25eed8b8ef 100644
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--- a/gas/testsuite/gas/i386/fp-elf32.d
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+++ b/gas/testsuite/gas/i386/fp-elf32.d
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@@ -14,3 +14,4 @@ Contents of section .data:
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0060 00000000 00000080 fe3f0000 00000000 .*
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0070 00000080 fdbf0000 00000000 00000080 .*
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0080 ff030000 aaaaaaaa aaaaaaaa aaaaaaaa .*
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+ 0090 003c00c0 003c5555 55555555 55555555 .*
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diff --git a/gas/testsuite/gas/i386/fp-elf64.d b/gas/testsuite/gas/i386/fp-elf64.d
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index 0756aa1e36a..bdc8f86662e 100644
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--- a/gas/testsuite/gas/i386/fp-elf64.d
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+++ b/gas/testsuite/gas/i386/fp-elf64.d
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@@ -14,3 +14,4 @@ Contents of section .data:
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0060 00000000 00000080 fe3f0000 00000000 .*
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0070 00000000 00000080 fdbf0000 00000000 .*
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0080 00000000 00000080 ff030000 00000000 .*
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+ 0090 003c00c0 003c5555 55555555 55555555 .*
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diff --git a/gas/testsuite/gas/i386/fp.d b/gas/testsuite/gas/i386/fp.d
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index b93595ac8c3..65a5fccd6ee 100644
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--- a/gas/testsuite/gas/i386/fp.d
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+++ b/gas/testsuite/gas/i386/fp.d
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@@ -12,3 +12,4 @@ Contents of section .data:
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0050 ffffffff ffffffff ffffcccc cccccccc .*
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0060 00000000 00000080 fe3f0000 00000000 .*
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0070 0080fdbf 00000000 00000080 ff03aaaa .*
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+ 0080 003c00c0 003c5555 55555555 55555555 .*
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diff --git a/gas/testsuite/gas/i386/fp.s b/gas/testsuite/gas/i386/fp.s
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index 7fe642e5180..8976dd82f60 100644
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--- a/gas/testsuite/gas/i386/fp.s
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+++ b/gas/testsuite/gas/i386/fp.s
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@@ -29,3 +29,6 @@
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.dc.x 0x:bffd80
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.dcb.x 1, 0x:03ff80
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.p2align 4,0xaa
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+
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+ .hfloat 1, -2, 0x:3c00
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+ .p2align 4,0x55
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--
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2.33.0
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