divert(-1) dnl dnl m4 macros for gmp assembly code, shared by all CPUs. dnl dnl These macros are designed for use with any m4 and have been used on dnl GNU, FreeBSD, OpenBSD and SysV. dnl dnl GNU m4 and OpenBSD 2.7 m4 will give filenames and line numbers in error dnl messages. dnl Copyright (C) 1999, 2000 Free Software Foundation, Inc. dnl dnl This file is part of the GNU MP Library. dnl dnl The GNU MP Library is free software; you can redistribute it and/or dnl modify it under the terms of the GNU Lesser General Public License as dnl published by the Free Software Foundation; either version 2.1 of the dnl License, or (at your option) any later version. dnl dnl The GNU MP Library is distributed in the hope that it will be useful, dnl but WITHOUT ANY WARRANTY; without even the implied warranty of dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU dnl Lesser General Public License for more details. dnl dnl You should have received a copy of the GNU Lesser General Public dnl License along with the GNU MP Library; see the file COPYING.LIB. If dnl not, write to the Free Software Foundation, Inc., 59 Temple Place - dnl Suite 330, Boston, MA 02111-1307, USA. dnl Macros: dnl dnl Most new m4 specific macros have an "m4_" prefix to emphasise they're dnl m4 expansions. But new defining things like deflit() and defreg() are dnl named like the builtin define(), and forloop() is named following the dnl GNU m4 example on which it's based. dnl dnl GNU m4 with the -P option uses "m4_" as a prefix for builtins, but that dnl option isn't going to be used, so there's no conflict or confusion. dnl dnl dnl Comments in output: dnl dnl The m4 comment delimiters are left at # and \n, the normal assembler dnl commenting for most CPUs. m4 passes comment text through without dnl expanding macros in it, which is generally a good thing since it stops dnl unexpected expansions and possible resultant errors. dnl dnl But note that when a quoted string is being read, a # isn't special, so dnl apostrophes in comments in quoted strings must be avoided or they'll be dnl interpreted as a closing quote mark. But when the quoted text is dnl re-read # will still act like a normal comment, supressing macro dnl expansion. dnl dnl For example, dnl dnl # apostrophes in comments that're outside quotes are ok dnl # and using macro names like PROLOGUE is ok too dnl ... dnl ifdef(`PIC',` dnl # but apostrophes aren't ok inside quotes dnl # ^--wrong dnl ... dnl # though macro names like PROLOGUE are still ok dnl ... dnl ') dnl dnl If macro expansion in a comment is wanted, use `#' in the .asm (ie. a dnl quoted hash symbol), which will turn into # in the .s but get dnl expansions done on that line. This can make the .s more readable to dnl humans, but it won't make a blind bit of difference to the assembler. dnl dnl All the above applies, mutatis mutandis, when changecom() is used to dnl select @ ! ; or whatever other commenting. dnl dnl dnl Variations in m4 affecting gmp: dnl dnl $# - When a macro is called as "foo" with no brackets, BSD m4 sets $# dnl to 1, whereas GNU or SysV m4 set it to 0. In all cases though dnl "foo()" sets $# to 1. This is worked around in various places. dnl dnl len() - When "len()" is given an empty argument, BSD m4 evaluates to dnl nothing, whereas GNU, SysV, and the new OpenBSD, evaluate to 0. dnl See m4_length() below which works around this. dnl dnl translit() - GNU m4 accepts character ranges like A-Z, and the new dnl OpenBSD m4 does under option -g, but basic BSD and SysV don't. dnl dnl popdef() - in BSD and SysV m4 popdef() takes multiple arguments and dnl pops each, but GNU m4 only takes one argument. dnl dnl push back - BSD m4 has some limits on the amount of text that can be dnl pushed back. The limit is reasonably big and so long as macros dnl don't gratuitously duplicate big arguments it isn't a problem. dnl Normally an error message is given, but sometimes it just hangs. dnl dnl eval() &,|,^ - GNU and SysV m4 have bitwise operators &,|,^ available, dnl but BSD m4 doesn't (contrary to what the man page suggests) and dnl instead ^ is exponentiation. dnl dnl eval() ?: - The C ternary operator "?:" is available in BSD m4, but not dnl in SysV or GNU m4 (as of GNU m4 1.4 and betas of 1.5). dnl dnl eval() -2^31 - BSD m4 has a bug where an eval() resulting in -2^31 dnl (ie. -2147483648) gives "-(". Using -2147483648 within an dnl expression is ok, it just can't be a final result. "-(" will of dnl course upset parsing, with all sorts of strange effects. dnl dnl eval() <<,>> - SysV m4 doesn't support shift operators in eval() (on dnl SunOS 5.7 /usr/xpg4/m4 has them but /usr/ccs/m4 doesn't). See dnl m4_lshift() and m4_rshift() below for workarounds. dnl dnl m4wrap() - in BSD m4, m4wrap() replaces any previous m4wrap() string, dnl in SysV m4 it appends to it, and in GNU m4 it prepends. See dnl m4wrap_prepend() below which brings uniformity to this. dnl dnl __file__,__line__ - GNU m4 and OpenBSD 2.7 m4 provide these, and dnl they're used here to make error messages more informative. GNU m4 dnl gives an unhelpful "NONE 0" in an m4wrap(), but that's worked dnl around. dnl dnl __file__ quoting - OpenBSD m4, unlike GNU m4, doesn't quote the dnl filename in __file__, so care should be taken that no macro has dnl the same name as a file, or an unwanted expansion will occur when dnl printing an error or warning. dnl dnl OpenBSD 2.6 m4 - this m4 rejects decimal constants containing an 8 or 9 dnl in eval(), making it pretty much unusable. This bug is confined dnl to version 2.6 (it's not in 2.5, and has been fixed in 2.7). dnl dnl SunOS /usr/bin/m4 - this m4 lacks a number of desired features, dnl including $# and $@, defn(), m4exit(), m4wrap(), pushdef(), dnl popdef(). /usr/5bin/m4 is a SysV style m4 which should always be dnl available, and "configure" will reject /usr/bin/m4 in favour of dnl /usr/5bin/m4 (if necessary). dnl dnl The sparc code actually has modest m4 requirements currently and dnl could manage with /usr/bin/m4, but there's no reason to put our dnl macros through contortions when /usr/5bin/m4 is available or GNU dnl m4 can be installed. ifdef(`__ASM_DEFS_M4_INCLUDED__', `m4_error(`asm-defs.m4 already included, dont include it twice ')m4exit(1)') define(`__ASM_DEFS_M4_INCLUDED__') dnl Detect and give a message about the unsuitable OpenBSD 2.6 m4. ifelse(eval(89),89,, `errprint( `This m4 doesnt accept 8 and/or 9 in constants in eval(), making it unusable. This is probably OpenBSD 2.6 m4 (September 1999). Upgrade to OpenBSD 2.7, or get a bug fix from the CVS (expr.c rev 1.9), or get GNU m4. Dont forget to configure with M4=/wherever/m4 if you install one of these in a directory not in $PATH. ')m4exit(1)') dnl Detect and give a message about the unsuitable SunOS /usr/bin/m4. dnl dnl Unfortunately this test doesn't work when m4 is run in the normal way dnl from mpn/Makefile with "m4 -DOPERATION_foo foo.asm", since the bad m4 dnl takes "-" in "-D..." to mean read stdin, so it will look like it just dnl hangs. But running "m4 asm-defs.m4" to try it out will work. dnl dnl We'd like to abort immediately on finding a problem, but unfortunately dnl the bad m4 doesn't have an m4exit(), nor does an invalid eval() kill dnl it. Unexpanded $#'s in some m4_assert_numargs() later on will comment dnl out some closing parentheses and kill it with "m4: arg stack overflow". define(m4_dollarhash_works_test,``$#'') ifelse(m4_dollarhash_works_test(x),1,, `errprint( `This m4 doesnt support $# and cant be used for GMP asm processing. If this is on SunOS, ./configure should choose /usr/5bin/m4 if you have that or can get it, otherwise install GNU m4. Dont forget to configure with M4=/wherever/m4 if you install in a directory not in $PATH. ')') undefine(`m4_dollarhash_works_test') dnl -------------------------------------------------------------------------- dnl Basic error handling things. dnl Usage: m4_dollarhash_1_if_noparen_p dnl dnl Expand to 1 if a call "foo" gives $# set to 1 (as opposed to 0 like GNU dnl and SysV m4 give). define(m4_dollarhash_1_if_noparen_test,`$#') define(m4_dollarhash_1_if_noparen_p, eval(m4_dollarhash_1_if_noparen_test==1)) undefine(`m4_dollarhash_1_if_noparen_test') dnl Usage: m4wrap_prepend(string) dnl dnl Prepend the given string to what will be exapanded under m4wrap at the dnl end of input. dnl dnl This macro exists to work around variations in m4wrap() behaviour in dnl the various m4s (notes at the start of this file). Don't use m4wrap() dnl directly since it will interfere with this scheme. define(m4wrap_prepend, m4_assert_numargs(1) `define(`m4wrap_string',`$1'defn(`m4wrap_string'))') m4wrap(`m4wrap_string') define(m4wrap_string,`') dnl Usage: m4_file_and_line dnl dnl Expand to the current file and line number, if the GNU m4 extensions dnl __file__ and __line__ are available. dnl dnl In GNU m4 1.4 at the end of input when m4wrap text is expanded, dnl __file__ is NONE and __line__ is 0, which is not a helpful thing to dnl print. If m4_file_seen() has been called to note the last file seen, dnl then that file at a big line number is used, otherwise "end of input" dnl is used (although "end of input" won't parse as an error message). define(m4_file_and_line, `ifdef(`__file__', `ifelse(__file__`'__line__,`NONE0', `ifdef(`m4_file_seen_last',`m4_file_seen_last: 999999: ',`end of input: ')', `__file__: __line__: ')')') dnl Usage: m4_errprint_commas(arg,...) dnl dnl The same as errprint(), but commas are printed between arguments dnl instead of spaces. define(m4_errprint_commas, `errprint(`$1')dnl ifelse(eval($#>1),1,`errprint(`,')m4_errprint_commas(shift($@))')') dnl Usage: m4_error(args...) dnl m4_warning(args...) dnl dnl Print an error message, using m4_errprint_commas, prefixed with the dnl current filename and line number (if available). m4_error sets up to dnl give an error exit at the end of processing, m4_warning just prints. dnl These macros are the recommended way to print errors. dnl dnl The arguments here should be quoted in the usual way to prevent them dnl being expanded when the macro call is read. (m4_error takes care not dnl to do any further expansion.) dnl dnl For example, dnl dnl m4_error(`some error message dnl ') dnl dnl which prints dnl dnl foo.asm:123: some error message dnl dnl or if __file__ and __line__ aren't available dnl dnl some error message dnl dnl The "file:line:" format is a basic style, used by gcc and GNU m4, so dnl emacs and other editors will recognise it in their normal error message dnl parsing. define(m4_warning, `m4_errprint_commas(m4_file_and_line`'$@)') define(m4_error, `define(`m4_error_occurred',1)m4_warning($@)') define(`m4_error_occurred',0) dnl This m4wrap_prepend() is first, so it'll be executed last. m4wrap_prepend( `ifelse(m4_error_occurred,1, `m4_error(`Errors occurred during m4 processing ')m4exit(1)')') dnl Usage: m4_assert_numargs(num) dnl dnl Put this unquoted on a line on its own at the start of a macro dnl definition to add some code to check that num many arguments get passed dnl to the macro. For example, dnl dnl define(foo, dnl m4_assert_numargs(2) dnl `something `$1' and `$2' blah blah') dnl dnl Then a call like foo(one,two,three) will provoke an error like dnl dnl file:10: foo expected 2 arguments, got 3 arguments dnl dnl Here are some calls and how many arguments they're interpreted as passing. dnl dnl foo(abc,def) 2 dnl foo(xyz) 1 dnl foo() 0 dnl foo -1 dnl dnl The -1 for no parentheses at all means a macro that's meant to be used dnl that way can be checked with m4_assert_numargs(-1). For example, dnl dnl define(SPECIAL_SUFFIX, dnl m4_assert_numargs(-1) dnl `ifdef(`FOO',`_foo',`_bar')') dnl dnl But as an alternative see also deflit() below where parenthesized dnl expressions following a macro are passed through to the output. dnl dnl Note that in BSD m4 there's no way to differentiate calls "foo" and dnl "foo()", so in BSD m4 the distinction between the two isn't enforced. dnl (In GNU and SysV m4 it can be checked, and is.) dnl m4_assert_numargs is able to check its own arguments by calling dnl assert_numargs_internal directly. dnl dnl m4_doublequote($`'0) expands to ``$0'', whereas ``$`'0'' would expand dnl to `$`'0' and do the wrong thing, and likewise for $1. The same is dnl done in other assert macros. dnl dnl $`#' leaves $# in the new macro being defined, and stops # being dnl interpreted as a comment character. dnl dnl `dnl ' means an explicit dnl isn't necessary when m4_assert_numargs is dnl used. The space means that if there is a dnl it'll still work. dnl Usage: m4_doublequote(x) expands to ``x'' define(m4_doublequote, `m4_assert_numargs_internal(`$0',1,$#,len(`$1'))``$1''') define(m4_assert_numargs, `m4_assert_numargs_internal(`$0',1,$#,len(`$1'))dnl `m4_assert_numargs_internal'(m4_doublequote($`'0),$1,$`#',`len'(m4_doublequote($`'1)))`dnl '') dnl Called: m4_assert_numargs_internal(`macroname',wantargs,$#,len(`$1')) define(m4_assert_numargs_internal, `m4_assert_numargs_internal_check(`$1',`$2',m4_numargs_count(`$3',`$4'))') dnl Called: m4_assert_numargs_internal_check(`macroname',wantargs,gotargs) dnl dnl If m4_dollarhash_1_if_noparen_p (BSD m4) then gotargs can be 0 when it dnl should be -1. If wantargs is -1 but gotargs is 0 and the two can't be dnl distinguished then it's allowed to pass. dnl define(m4_assert_numargs_internal_check, `ifelse(eval($2 == $3 || ($2==-1 && $3==0 && m4_dollarhash_1_if_noparen_p)),0, `m4_error(`$1 expected 'm4_Narguments(`$2')`, got 'm4_Narguments(`$3') )')') dnl Called: m4_numargs_count($#,len(`$1')) dnl If $#==0 then -1 args, if $#==1 but len(`$1')==0 then 0 args, otherwise dnl $# args. define(m4_numargs_count, `ifelse($1,0, -1, `ifelse(eval($1==1 && $2-0==0),1, 0, $1)')') dnl Usage: m4_Narguments(N) dnl "$1 argument" or "$1 arguments" with the plural according to $1. define(m4_Narguments, `$1 argument`'ifelse(`$1',1,,s)') dnl -------------------------------------------------------------------------- dnl Additional error checking things. dnl Usage: m4_file_seen() dnl dnl Record __file__ for the benefit of m4_file_and_line in m4wrap text. dnl The basic __file__ macro comes out quoted, like `foo.asm', and dnl m4_file_seen_last is defined like that too. dnl dnl This only needs to be used with something that could generate an error dnl message in m4wrap text. The x86 PROLOGUE is the only such at the dnl moment (at end of input its m4wrap checks for missing EPILOGUE). A few dnl include()s can easily trick this scheme, but you'd expect an EPILOGUE dnl in the same file as the PROLOGUE. define(m4_file_seen, m4_assert_numargs(0) `ifelse(__file__,`NONE',, `define(`m4_file_seen_last',m4_doublequote(__file__))')') dnl Usage: m4_assert_onearg() dnl dnl Put this, unquoted, at the start of a macro definition to add some code dnl to check that one argument is passed to the macro, but with that dnl argument allowed to be empty. For example, dnl dnl define(foo, dnl m4_assert_onearg() dnl `blah blah $1 blah blah') dnl dnl Calls "foo(xyz)" or "foo()" are accepted. A call "foo(xyz,abc)" fails. dnl A call "foo" fails too, but BSD m4 can't detect this case (GNU and SysV dnl m4 can). define(m4_assert_onearg, m4_assert_numargs(0) `m4_assert_onearg_internal'(m4_doublequote($`'0),$`#')`dnl ') dnl Called: m4_assert_onearg(`macroname',$#) define(m4_assert_onearg_internal, `ifelse($2,1,, `m4_error(`$1 expected 1 argument, got 'm4_Narguments(`$2') )')') dnl Usage: m4_assert_numargs_range(low,high) dnl dnl Put this, unquoted, at the start of a macro definition to add some code dnl to check that between low and high many arguments get passed to the dnl macro. For example, dnl dnl define(foo, dnl m4_assert_numargs_range(3,5) dnl `mandatory $1 $2 $3 optional $4 $5 end') dnl dnl See m4_assert_numargs() for more info. define(m4_assert_numargs_range, m4_assert_numargs(2) ``m4_assert_numargs_range_internal'(m4_doublequote($`'0),$1,$2,$`#',`len'(m4_doublequote($`'1)))`dnl '') dnl Called: m4_assert_numargs_range_internal(`name',low,high,$#,len(`$1')) define(m4_assert_numargs_range_internal, m4_assert_numargs(5) `m4_assert_numargs_range_check(`$1',`$2',`$3',m4_numargs_count(`$4',`$5'))') dnl Called: m4_assert_numargs_range_check(`name',low,high,gotargs) dnl dnl If m4_dollarhash_1_if_noparen_p (BSD m4) then gotargs can be 0 when it dnl should be -1. To ensure a `high' of -1 works, a fudge is applied to dnl gotargs if it's 0 and the 0 and -1 cases can't be distinguished. dnl define(m4_assert_numargs_range_check, m4_assert_numargs(4) `ifelse(eval($2 <= $4 && ($4 - ($4==0 && m4_dollarhash_1_if_noparen_p) <= $3)),0, `m4_error(`$1 expected $2 to $3 arguments, got 'm4_Narguments(`$4') )')') dnl Usage: m4_assert_defined(symbol) dnl dnl Put this unquoted on a line of its own at the start of a macro dnl definition to add some code to check that the given symbol is defined dnl when the macro is used. For example, dnl dnl define(foo, dnl m4_assert_defined(`FOO_PREFIX') dnl `FOO_PREFIX whatever') dnl dnl This is a convenient way to check that the user or ./configure or dnl whatever has defined the things needed by a macro, as opposed to dnl silently generating garbage. define(m4_assert_defined, m4_assert_numargs(1) ``m4_assert_defined_internal'(m4_doublequote($`'0),``$1'')`dnl '') dnl Called: m4_assert_defined_internal(`macroname',`define_required') define(m4_assert_defined_internal, m4_assert_numargs(2) `ifdef(`$2',, `m4_error(`$1 needs $2 defined ')')') dnl Usage: m4_not_for_expansion(`SYMBOL') dnl define_not_for_expansion(`SYMBOL') dnl dnl m4_not_for_expansion turns SYMBOL, if defined, into something which dnl will give an error if expanded. For example, dnl dnl m4_not_for_expansion(`PIC') dnl dnl define_not_for_expansion is the same, but always makes a definition. dnl dnl These are for symbols that should be tested with ifdef(`FOO',...) dnl rather than be expanded as such. They guard against accidentally dnl omitting the quotes, as in ifdef(FOO,...). Note though that they only dnl catches this when FOO is defined, so be sure to test code both with and dnl without each definition. define(m4_not_for_expansion, m4_assert_numargs(1) `ifdef(`$1',`define_not_for_expansion(`$1')')') define(define_not_for_expansion, m4_assert_numargs(1) `ifelse(defn(`$1'),,, `m4_error(``$1' has a non-empty value, maybe it shouldnt be munged with m4_not_for_expansion() ')')dnl define(`$1',`m4_not_for_expansion_internal(`$1')')') define(m4_not_for_expansion_internal, `m4_error(``$1' is not meant to be expanded, perhaps you mean `ifdef(`$1',...)' ')') dnl -------------------------------------------------------------------------- dnl Various generic m4 things. dnl Usage: m4_ifdef_anyof_p(`symbol',...) dnl dnl Expand to 1 if any of the symbols in the argument list are defined, or dnl to 0 if not. define(m4_ifdef_anyof_p, `ifelse(eval($#<=1 && m4_length(`$1')==0),1, 0, `ifdef(`$1', 1, `m4_ifdef_anyof_p(shift($@))')')') dnl Usage: m4_length(string) dnl dnl Determine the length of a string. This is the same as len(), but dnl always expands to a number, working around the BSD len() which dnl evaluates to nothing given an empty argument. define(m4_length, m4_assert_onearg() `eval(len(`$1')-0)') dnl Usage: m4_stringequal_p(x,y) dnl dnl Expand to 1 or 0 according as strings x and y are equal or not. define(m4_stringequal_p, `ifelse(`$1',`$2',1,0)') dnl Usage: m4_incr_or_decr(n,last) dnl dnl Do an incr(n) or decr(n), whichever is in the direction of "last". dnl Both n and last must be numbers of course. define(m4_incr_or_decr, m4_assert_numargs(2) `ifelse(eval($1<$2),1,incr($1),decr($1))') dnl Usage: forloop(i, first, last, statement) dnl dnl Based on GNU m4 examples/forloop.m4, but extended. dnl dnl statement is expanded repeatedly, with i successively defined as dnl dnl first, first+1, ..., last-1, last dnl dnl Or if first > last, then it's dnl dnl first, first-1, ..., last+1, last dnl dnl If first == last, then one expansion is done. dnl dnl A pushdef/popdef of i is done to preserve any previous definition (or dnl lack of definition). first and last are eval()ed and so can be dnl expressions. dnl dnl forloop_first is defined to 1 on the first iteration, 0 on the rest. dnl forloop_last is defined to 1 on the last iteration, 0 on the others. dnl Nested forloops are allowed, in which case forloop_first and dnl forloop_last apply to the innermost loop that's open. dnl dnl A simple example, dnl dnl forloop(i, 1, 2*2+1, `dnl dnl iteration number i ... ifelse(forloop_first,1,FIRST) dnl ') dnl "i" and "statement" are carefully quoted, but "first" and "last" are dnl just plain numbers once eval()ed. define(`forloop', m4_assert_numargs(4) `pushdef(`$1',eval(`$2'))dnl pushdef(`forloop_first',1)dnl pushdef(`forloop_last',0)dnl forloop_internal(`$1',eval(`$3'),`$4')`'dnl popdef(`forloop_first')dnl popdef(`forloop_last')dnl popdef(`$1')') dnl Called: forloop_internal(`var',last,statement) define(`forloop_internal', m4_assert_numargs(3) `ifelse($1,$2, `define(`forloop_last',1)$3', `$3`'dnl define(`forloop_first',0)dnl define(`$1',m4_incr_or_decr($1,$2))dnl forloop_internal(`$1',$2,`$3')')') dnl Usage: m4_toupper(x) dnl m4_tolower(x) dnl dnl Convert the argument string to upper or lower case, respectively. dnl Only one argument accepted. dnl dnl BSD m4 doesn't take ranges like a-z in translit(), so the full alphabet dnl is written out. define(m4_alphabet_lower, `abcdefghijklmnopqrstuvwxyz') define(m4_alphabet_upper, `ABCDEFGHIJKLMNOPQRSTUVWXYZ') define(m4_toupper, m4_assert_onearg() `translit(`$1', m4_alphabet_lower, m4_alphabet_upper)') define(m4_tolower, m4_assert_onearg() `translit(`$1', m4_alphabet_upper, m4_alphabet_lower)') dnl Usage: m4_empty_if_zero(x) dnl dnl Evaluate to x, or to nothing if x is 0. x is eval()ed and so can be an dnl expression. dnl dnl This is useful for x86 addressing mode displacements since forms like dnl (%ebx) are one byte shorter than 0(%ebx). A macro `foo' for use as dnl foo(%ebx) could be defined with the following so it'll be empty if the dnl expression comes out zero. dnl dnl deflit(`foo', `m4_empty_if_zero(a+b*4-c)') dnl dnl Naturally this shouldn't be done if, say, a computed jump depends on dnl the code being a particular size. define(m4_empty_if_zero, m4_assert_onearg() `ifelse(eval($1),0,,eval($1))') dnl Usage: m4_log2(x) dnl dnl Calculate a logarithm to base 2. dnl x must be an integral power of 2, between 2**0 and 2**30. dnl x is eval()ed, so it can be an expression. dnl An error results if x is invalid. dnl dnl 2**31 isn't supported, because an unsigned 2147483648 is out of range dnl of a 32-bit signed int. Also, the bug in BSD m4 where an eval() dnl resulting in 2147483648 (or -2147483648 as the case may be) gives `-(' dnl means tests like eval(1<<31==(x)) would be necessary, but that then dnl gives an unattractive explosion of eval() error messages if x isn't dnl numeric. define(m4_log2, m4_assert_numargs(1) `m4_log2_internal(0,1,eval(`$1'))') dnl Called: m4_log2_internal(n,2**n,target) define(m4_log2_internal, m4_assert_numargs(3) `ifelse($2,$3,$1, `ifelse($1,30, `m4_error(`m4_log2() argument too big or not a power of two: $3 ')', `m4_log2_internal(incr($1),eval(2*$2),$3)')')') dnl Usage: m4_div2_towards_zero dnl dnl m4 division is probably whatever a C signed division is, and C doesn't dnl specify what rounding gets used on negatives, so this expression forces dnl a rounding towards zero. define(m4_div2_towards_zero, m4_assert_numargs(1) `eval((($1) + ((($1)<0) & ($1))) / 2)') dnl Usage: m4_lshift(n,count) dnl m4_rshift(n,count) dnl dnl Calculate n shifted left or right by count many bits. Both n and count dnl are eval()ed and so can be expressions. dnl dnl Negative counts are allowed and mean a shift in the opposite direction. dnl Negative n is allowed and right shifts will be arithmetic (meaning dnl divide by 2**count, rounding towards zero, also meaning the sign bit is dnl duplicated). dnl dnl Use these macros instead of << and >> in eval() since the basic ccs dnl SysV m4 doesn't have those operators. define(m4_rshift, m4_assert_numargs(2) `m4_lshift(`$1',-(`$2'))') define(m4_lshift, m4_assert_numargs(2) `m4_lshift_internal(eval(`$1'),eval(`$2'))') define(m4_lshift_internal, m4_assert_numargs(2) `ifelse(eval($2-0==0),1,$1, `ifelse(eval($2>0),1, `m4_lshift_internal(eval($1*2),decr($2))', `m4_lshift_internal(m4_div2_towards_zero($1),incr($2))')')') dnl Usage: deflit(name,value) dnl dnl Like define(), but "name" expands like a literal, rather than taking dnl arguments. For example "name(%eax)" expands to "value(%eax)". dnl dnl Limitations: dnl dnl $ characters in the value part must have quotes to stop them looking dnl like macro parameters. For example, deflit(reg,`123+$`'4+567'). See dnl defreg() below for handling simple register definitions like $7 etc. dnl dnl "name()" is turned into "name", unfortunately. In GNU and SysV m4 an dnl error is generated when this happens, but in BSD m4 it will happen dnl silently. The problem is that in BSD m4 $# is 1 in both "name" or dnl "name()", so there's no way to differentiate them. Because we want dnl plain "name" to turn into plain "value", we end up with "name()" dnl turning into plain "value" too. dnl dnl "name(foo)" will lose any whitespace after commas in "foo", for example dnl "disp(%eax, %ecx)" would become "128(%eax,%ecx)". dnl dnl These parentheses oddities shouldn't matter in assembler text, but if dnl they do the suggested workaround is to write "name ()" or "name (foo)" dnl to stop the parentheses looking like a macro argument list. If a space dnl isn't acceptable in the output, then write "name`'()" or "name`'(foo)". dnl The `' is stripped when read, but again stops the parentheses looking dnl like parameters. dnl Quoting for deflit_emptyargcheck is similar to m4_assert_numargs. The dnl stuff in the ifelse gives a $#, $1 and $@ evaluated in the new macro dnl created, not in deflit. define(deflit, m4_assert_numargs(2) `define(`$1', `deflit_emptyargcheck'(``$1'',$`#',m4_doublequote($`'1))`dnl $2`'dnl ifelse(eval($'`#>1 || m4_length('m4_doublequote($`'1)`)!=0),1,($'`@))')') dnl Called: deflit_emptyargcheck(macroname,$#,`$1') define(deflit_emptyargcheck, `ifelse(eval($2==1 && !m4_dollarhash_1_if_noparen_p && m4_length(`$3')==0),1, `m4_error(`dont use a deflit as $1() because it loses the brackets (see deflit in asm-incl.m4 for more information) ')')') dnl Usage: m4_assert(`expr') dnl dnl Test a compile-time requirement with an m4 expression. The expression dnl should be quoted, and will be eval()ed and expected to be non-zero. dnl For example, dnl dnl m4_assert(`FOO*2+6 < 14') define(m4_assert, m4_assert_numargs(1) `ifelse(eval($1),1,, `m4_error(`assertion failed: $1 ')')') dnl -------------------------------------------------------------------------- dnl Various assembler things, not specific to any particular CPU. dnl dnl Usage: include_mpn(`filename') dnl dnl Like include(), but adds a path to the mpn source directory. For dnl example, dnl dnl include_mpn(`sparc64/addmul_1h.asm') define(include_mpn, m4_assert_numargs(1) m4_assert_defined(`CONFIG_TOP_SRCDIR') `include(CONFIG_TOP_SRCDIR`/mpn/$1')') dnl Usage: C comment ... dnl dnl "C" works like a FORTRAN-style comment character. This can be used for dnl comments to the right of assembly instructions, where just dnl would dnl remove the linefeed, and concatenate adjacent lines. dnl dnl "C" and/or "dnl" are useful when an assembler doesn't support comments, dnl or where different assemblers for a particular CPU have different dnl comment styles. The intermediate ".s" files will end up with no dnl comments, just code. dnl dnl Using "C" is not intended to cause offence to anyone who doesn't like dnl FORTRAN; but if that happens it's an unexpected bonus. define(C, ` dnl') dnl Various possible defines passed from the Makefile that are to be tested dnl with ifdef() rather than be expanded. m4_not_for_expansion(`PIC') dnl aors_n m4_not_for_expansion(`OPERATION_add_n') m4_not_for_expansion(`OPERATION_sub_n') dnl aorsmul_n m4_not_for_expansion(`OPERATION_addmul_1') m4_not_for_expansion(`OPERATION_submul_1') dnl logops_n m4_not_for_expansion(`OPERATION_and_n') m4_not_for_expansion(`OPERATION_andn_n') m4_not_for_expansion(`OPERATION_nand_n') m4_not_for_expansion(`OPERATION_ior_n') m4_not_for_expansion(`OPERATION_iorn_n') m4_not_for_expansion(`OPERATION_nior_n') m4_not_for_expansion(`OPERATION_xor_n') m4_not_for_expansion(`OPERATION_xnor_n') dnl popham m4_not_for_expansion(`OPERATION_popcount') m4_not_for_expansion(`OPERATION_hamdist') dnl Usage: m4_config_gmp_mparam(`symbol') dnl dnl Check that `symbol' is defined. If it isn't, issue an error and dnl terminate immediately. The error message explains that the symbol dnl should be in config.m4, copied from gmp-mparam.h. dnl dnl Processing is terminated immediately since missing something like dnl KARATSUBA_SQR_THRESHOLD can lead to infinite loops with endless error dnl messages. define(m4_config_gmp_mparam, m4_assert_numargs(1) `ifdef(`$1',, `m4_error(`$1 is not defined. "configure" should have extracted this from gmp-mparam.h and put it in config.m4, but somehow this has failed. ')m4exit(1)')') dnl Usage: defreg(name,reg) dnl dnl Give a name to a $ style register. For example, dnl dnl defreg(foo,$12) dnl dnl defreg() inserts an extra pair of quotes after the $ so that it's not dnl interpreted as an m4 macro parameter, ie. foo is actually $`'12. m4 dnl strips those quotes when foo is expanded. dnl dnl deflit() is used to make the new definition, so it will expand dnl literally even if followed by parentheses ie. foo(99) will become dnl $12(99). (But there's nowhere that would be used is there?) dnl dnl When making further definitions from existing defreg() macros, remember dnl to use defreg() again to protect the $ in the new definitions too. For dnl example, dnl dnl defreg(a0,$4) dnl defreg(a1,$5) dnl ... dnl dnl defreg(PARAM_DST,a0) dnl dnl This is only because a0 is expanding at the time the PARAM_DST dnl definition is made, leaving a literal $4 that must be re-quoted. On dnl the other hand in something like the following ra is only expanded when dnl ret is used and its $`'31 protection will have its desired effect at dnl that time. dnl dnl defreg(ra,$31) dnl ... dnl define(ret,`j ra') dnl dnl Note that only $n forms are meant to be used here, and something like dnl 128($30) doesn't get protected and will come out wrong. define(defreg, m4_assert_numargs(2) `deflit(`$1', substr(`$2',0,1)``''substr(`$2',1))') dnl Usage: m4_instruction_wrapper(num) dnl dnl Put this, unquoted, on a line on its own, at the start of a macro dnl that's a wrapper around an assembler instruction. It adds code to give dnl a descriptive error message if the macro is invoked without arguments. dnl dnl For example, suppose jmp needs to be wrapped, dnl dnl define(jmp, dnl m4_instruction_wrapper() dnl m4_assert_numargs(1) dnl `.byte 0x42 dnl .long $1 dnl nop') dnl dnl The point of m4_instruction_wrapper is to get a better error message dnl than m4_assert_numargs would give if jmp is accidentally used as plain dnl "jmp foo" instead of the intended "jmp( foo)". "jmp()" with no dnl argument also provokes the error message. dnl dnl m4_instruction_wrapper should only be used with wrapped instructions dnl that take arguments, since obviously something meant to be used as dnl plain "ret", say, doesn't want to give an error when used that way. define(m4_instruction_wrapper, m4_assert_numargs(0) ``m4_instruction_wrapper_internal'(m4_doublequote($`'0),dnl m4_doublequote(ifdef(`__file__',__file__,`the m4 sources')),dnl $`#',m4_doublequote($`'1))`dnl'') dnl Called: m4_instruction_wrapper_internal($0,`filename',$#,$1) define(m4_instruction_wrapper_internal, `ifelse(eval($3<=1 && m4_length(`$4')==0),1, `m4_error(`$1 is a macro replacing that instruction and needs arguments, see $2 for details ')')') dnl Usage: UNROLL_LOG2, UNROLL_MASK, UNROLL_BYTES dnl CHUNK_LOG2, CHUNK_MASK, CHUNK_BYTES dnl dnl When code supports a variable amount of loop unrolling, the convention dnl is to define UNROLL_COUNT to the number of limbs processed per loop. dnl When testing code this can be varied to see how much the loop overhead dnl is costing. For example, dnl dnl deflit(UNROLL_COUNT, 32) dnl dnl If the forloop() generating the unrolled loop has a pattern processing dnl more than one limb, the convention is to express this with CHUNK_COUNT. dnl For example, dnl dnl deflit(CHUNK_COUNT, 2) dnl dnl The LOG2, MASK and BYTES definitions below are derived from these COUNT dnl definitions. If COUNT is redefined, the LOG2, MASK and BYTES follow dnl the new definition automatically. dnl dnl LOG2 is the log base 2 of COUNT. MASK is COUNT-1, which can be used as dnl a bit mask. BYTES is BYTES_PER_MP_LIMB*COUNT, the number of bytes dnl processed in each unrolled loop. dnl dnl BYTES_PER_MP_LIMB is defined in a CPU specific m4 include file. It dnl exists only so the BYTES definitions here can be common to all CPUs. dnl In the actual code for a given CPU, an explicit 4 or 8 may as well be dnl used because the code is only for a particular CPU, it doesn't need to dnl be general. dnl dnl Note that none of these macros do anything except give conventional dnl names to commonly used things. You still have to write your own dnl expressions for a forloop() and the resulting address displacements. dnl Something like the following would be typical for 4 bytes per limb. dnl dnl forloop(`i',0,UNROLL_COUNT-1,` dnl deflit(`disp',eval(i*4)) dnl ... dnl ') dnl dnl Or when using CHUNK_COUNT, dnl dnl forloop(`i',0,UNROLL_COUNT/CHUNK_COUNT-1,` dnl deflit(`disp0',eval(i*CHUNK_COUNT*4)) dnl deflit(`disp1',eval(disp0+4)) dnl ... dnl ') dnl dnl Clearly `i' can be run starting from 1, or from high to low or whatever dnl best suits. deflit(UNROLL_LOG2, m4_assert_defined(`UNROLL_COUNT') `m4_log2(UNROLL_COUNT)') deflit(UNROLL_MASK, m4_assert_defined(`UNROLL_COUNT') `eval(UNROLL_COUNT-1)') deflit(UNROLL_BYTES, m4_assert_defined(`UNROLL_COUNT') m4_assert_defined(`BYTES_PER_MP_LIMB') `eval(UNROLL_COUNT * BYTES_PER_MP_LIMB)') deflit(CHUNK_LOG2, m4_assert_defined(`CHUNK_COUNT') `m4_log2(CHUNK_COUNT)') deflit(CHUNK_MASK, m4_assert_defined(`CHUNK_COUNT') `eval(CHUNK_COUNT-1)') deflit(CHUNK_BYTES, m4_assert_defined(`CHUNK_COUNT') m4_assert_defined(`BYTES_PER_MP_LIMB') `eval(CHUNK_COUNT * BYTES_PER_MP_LIMB)') dnl Usage: MPN(name) dnl dnl Add MPN_PREFIX to a name. dnl MPN_PREFIX defaults to "__gmpn_" if not defined. ifdef(`MPN_PREFIX',, `define(`MPN_PREFIX',`__gmpn_')') define(MPN, m4_assert_numargs(1) `MPN_PREFIX`'$1') dnl Usage: mpn_add_n, etc dnl dnl Convenience definitions using MPN(), like the #defines in gmp.h. Each dnl function that might be implemented in assembler is here. define(define_mpn, m4_assert_numargs(1) `define(`mpn_$1',`MPN(`$1')')') define_mpn(add) define_mpn(add_1) define_mpn(add_n) define_mpn(add_nc) define_mpn(addmul_1) define_mpn(addmul_1c) define_mpn(addsub_n) define_mpn(addsub_nc) define_mpn(and_n) define_mpn(andn_n) define_mpn(bdivmod) define_mpn(cmp) define_mpn(com_n) define_mpn(copyd) define_mpn(copyi) define_mpn(divexact_by3c) define_mpn(divrem) define_mpn(divrem_1) define_mpn(divrem_1c) define_mpn(divrem_2) define_mpn(divrem_classic) define_mpn(divrem_newton) define_mpn(dump) define_mpn(gcd) define_mpn(gcd_1) define_mpn(gcdext) define_mpn(get_str) define_mpn(hamdist) define_mpn(invert_limb) define_mpn(ior_n) define_mpn(iorn_n) define_mpn(kara_mul_n) define_mpn(kara_sqr_n) define_mpn(lshift) define_mpn(lshiftc) define_mpn(mod_1) define_mpn(mod_1c) define_mpn(mul) define_mpn(mul_1) define_mpn(mul_1c) define_mpn(mul_basecase) define_mpn(mul_n) define_mpn(perfect_square_p) define_mpn(popcount) define_mpn(preinv_mod_1) define_mpn(nand_n) define_mpn(nior_n) define_mpn(random) define_mpn(random2) define_mpn(rshift) define_mpn(rshiftc) define_mpn(scan0) define_mpn(scan1) define_mpn(set_str) define_mpn(sqr_basecase) define_mpn(sub_n) define_mpn(sqrtrem) define_mpn(sub) define_mpn(sub_1) define_mpn(sub_n) define_mpn(sub_nc) define_mpn(submul_1) define_mpn(submul_1c) define_mpn(toom3_mul_n) define_mpn(toom3_sqr_n) define_mpn(umul_ppmm) define_mpn(udiv_qrnnd) define_mpn(xnor_n) define_mpn(xor_n) define(`ASM_START', `') define(`PROLOGUE', ` TEXT ALIGN(4) GLOBL GSYM_PREFIX`$1' TYPE(GSYM_PREFIX`$1',`function') GSYM_PREFIX`$1':') define(`EPILOGUE', ` SIZE(GSYM_PREFIX`$1',.-GSYM_PREFIX`$1')') dnl LSYM_PREFIX might be L$, so defn() must be used to quote it or the L dnl will expand as the L macro, an infinite recursion. define(`L',`defn(`LSYM_PREFIX')$1') define(`INT32', ` ALIGN(4) $1: W32 $2 ') define(`INT64', ` ALIGN(8) $1: W32 $2 W32 $3 ') dnl Usage: ALIGN(bytes) dnl dnl Emit a ".align" directive. The alignment is specified in bytes, and dnl will normally need to be a power of 2. The actual ".align" generated dnl is either bytes or logarithmic according to what ./configure detects. dnl dnl ALIGN_FILL_0x90, if defined and equal to "yes", means a ", 0x90" should dnl be appended (this is for x86). define(ALIGN, m4_assert_numargs(1) m4_assert_defined(`ALIGN_LOGARITHMIC') `.align ifelse(ALIGN_LOGARITHMIC,yes,`m4_log2($1)',`eval($1)')dnl ifelse(ALIGN_FILL_0x90,yes,`, 0x90')') dnl Usage: MULFUNC_PROLOGUE(function function...) dnl dnl A dummy macro which is grepped for by ./configure to know what dnl functions a multi-function file is providing. Use this if there aren't dnl explicit PROLOGUE()s for each possible function. dnl dnl Multiple MULFUNC_PROLOGUEs can be used, or just one with the function dnl names separated by spaces. define(`MULFUNC_PROLOGUE', m4_assert_numargs(1) `') divert`'dnl