gdb/testsuite/gdb.dwarf2/dw2-bfloat16.exp

# Copyright 2021-2024 Free Software Foundation, Inc.

# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
#
# This test checks if GDB can identify bfloat16 and IEEE half float types and
# print them correctly.
#
load_lib dwarf.exp

# This test can only be run on targets which support DWARF-2 and use gas.
require dwarf2_support

standard_testfile .c -dw.S

# Make some DWARF for the test.
# 0x4049 is the equivalent of 3.141 for bfloat16.
# 0x4248 is the equivalent of 3.1406 for IEEE half float.
set asm_file [standard_output_file $srcfile2]
Dwarf::assemble $asm_file {
    global srcdir subdir srcfile

    cu {} {
	DW_TAG_compile_unit {
                {DW_AT_language @DW_LANG_C}
                {DW_AT_name     $srcfile}
                {DW_AT_comp_dir /tmp}
        } {
	    declare_labels bf16_type fp16_type \
		bf16_var fp16_var

            bf16_type: DW_TAG_base_type {
                {DW_AT_name __bf16}
		{encoding @DW_ATE_float}
                {DW_AT_byte_size 2 DW_FORM_sdata}
            }

            fp16_type: DW_TAG_base_type {
                {DW_AT_name __fp16}
		{encoding @DW_ATE_float}
                {DW_AT_byte_size 2 DW_FORM_sdata}
            }

	    bf16_var: DW_TAG_variable {
		{DW_AT_name "bf16_1"}
		{DW_AT_type :${bf16_type}}
		{DW_AT_const_value 0x4049 DW_FORM_sdata}
	    }

	    fp16_var: DW_TAG_variable {
		{DW_AT_name "fp16_1"}
		{DW_AT_type :${fp16_type}}
		{DW_AT_const_value 0x4248 DW_FORM_sdata}
	    }
	}
    }
}

if { [prepare_for_testing "failed to prepare" ${testfile} \
	  [list $srcfile $asm_file] {nodebug}] } {
    return -1
}

if ![runto_main] {
    return -1
}

# Make sure we can print both types correctly.
gdb_test "print bf16_1" " = 3.141"
gdb_test "print fp16_1" " = 3.1406"

#
# Test that 'x/hf' correctly handles "half float".
#

set bytes {0x48 0x42}
set endian [get_endianness]
if {$endian == "big"} {
    set bytes [lreverse $bytes]
}

gdb_test_no_output "set var \$s = (unsigned char *) &storage" \
    "set convenience variable"
gdb_test "print/x \$s\[0\] = [lindex $bytes 0]" \
    " = $hex" "set first element"
gdb_test "print/x \$s\[1\] = [lindex $bytes 1]" \
    " = $hex" "set second element"
gdb_test "print *(__fp16 *) \$s" " = 3\\.1406" \
    "print float16 value"
gdb_test "x/hf \$s" "$hex <storage>:\[ \t\]*3\\.1406" \
    "examine float16 value"