forked from Imagelibrary/binutils-gdb
2400729ecf
This second patch introduces mfpr_float_ops, an new implementation of target_float_ops. This implements precise emulation of target floating-point formats using the MPFR library. This is then used to perform operations on types that do not match any host type. Note that use of MPFR is still not required. The patch adds a configure option --with-mpfr similar to --with-expat. If use of MPFR is disabled via the option or MPFR is not available, code will fall back to current behavior. This means that operations on types that do not match any host type will be implemented on the host long double type instead. A new test case verifies that we can correctly print the largest __float128 value now. gdb/ChangeLog: 2017-11-22 Ulrich Weigand <uweigand@de.ibm.com> * NEWS: Document use of GNU MPFR. * README: Likewise. * Makefile.in (LIBMPFR): Add define. (CLIBS): Add $(LIBMPFR). * configure.ac: Add --with-mpfr configure option. * configure: Regenerate. * config.in: Regenerate. * target-float.c [HAVE_LIBMPFR]: Include <mpfr.h>. (class mpfr_float_ops): New type. (mpfr_float_ops::from_target): Two new overloaded functions. (mpfr_float_ops::to_target): Likewise. (mpfr_float_ops::to_string): New function. (mpfr_float_ops::from_string): Likewise. (mpfr_float_ops::to_longest): Likewise. (mpfr_float_ops::from_longest): Likewise. (mpfr_float_ops::from_ulongest): Likewise. (mpfr_float_ops::to_host_double): Likewise. (mpfr_float_ops::from_host_double): Likewise. (mpfr_float_ops::convert): Likewise. (mpfr_float_ops::binop): Likewise. (mpfr_float_ops::compare): Likewise. (get_target_float_ops): Use mpfr_float_ops if available. gdb/doc/ChangeLog: 2017-11-22 Ulrich Weigand <uweigand@de.ibm.com> * gdb.texinfo (Requirements): Document use of GNU MPFR. gdb/testsuite/ChangeLog: 2017-11-22 Ulrich Weigand <uweigand@de.ibm.com> * gdb.base/float128.c (large128): New variable. * gdb.base/float128.exp: Add test to print largest __float128 value.
80 lines
2.8 KiB
Plaintext
80 lines
2.8 KiB
Plaintext
# Copyright 2016-2017 Free Software Foundation, Inc.
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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# This file is part of the gdb testsuite. It is intended to test that
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# gdb could correctly handle floating point constant with a suffix.
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standard_testfile .c
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proc do_compile { {opts {}} } {
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global srcdir subdir srcfile binfile
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set ccopts {debug quiet}
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foreach opt $opts {lappend ccopts "additional_flags=$opt"}
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gdb_compile "${srcdir}/${subdir}/${srcfile}" "$binfile" executable $ccopts
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}
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if { [do_compile] != "" && [do_compile {-mfloat128}] != "" } {
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untested "compiler can't handle __float128 type?"
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return -1
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}
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clean_restart ${binfile}
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if ![runto_main] then {
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perror "couldn't run to breakpoint"
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continue
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}
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# Run to the breakpoint at return.
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gdb_breakpoint [gdb_get_line_number "return"]
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gdb_continue_to_breakpoint "return"
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# Print the original value of ld and f128
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gdb_test "print ld" ".* = 1\\.375.*" "the original value of ld is 1.375"
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gdb_test "print f128" ".* = 2\\.375.*" "the original value of f128 is 2.375"
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# Test that gdb could correctly recognize float constant expression with a suffix.
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# FIXME: gdb does not yet recognize the GNU extension 'q' suffix for __float128 constants.
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gdb_test "print ld=-1.375l" ".* = -1\\.375.*" "try to change ld to -1.375 with 'print ld=-1.375l'"
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gdb_test "print f128=-2.375l" ".* = -2\\.375.*" "try to change f128 to -2.375 with 'print f128=-2.375l'"
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# Test that gdb could handle the above correctly with "set var" command.
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set test "set variable ld=10.375l"
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gdb_test_multiple "set var ld=10.375l" "$test" {
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-re "$gdb_prompt $" {
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pass "$test"
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}
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-re "Invalid number.*$gdb_prompt $" {
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fail "$test (do not recognize 10.375l)"
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}
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}
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set test "set variable f128=20.375l"
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gdb_test_multiple "set var f128=20.375l" "$test" {
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-re "$gdb_prompt $" {
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pass "$test"
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}
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-re "Invalid number.*$gdb_prompt $" {
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fail "$test (do not recognize 20.375l)"
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}
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}
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gdb_test "print ld" ".* = 10\\.375.*" "the value of ld is changed to 10.375"
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gdb_test "print f128" ".* = 20\\.375.*" "the value of f128 is changed to 20.375"
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# Test that we can correctly handle the largest IEEE-128 value
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gdb_test "print large128" ".* = 1\\.18973149535723176508575932662800702e\\+4932" "print large128"
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