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Add new command line switch --no-construct-floats

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This commit is contained in:
Nick Clifton 2000-07-14 22:23:33 +00:00
parent fe794dc69d
commit 119d663aa4
3 changed files with 63 additions and 6 deletions
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14
gas/ChangeLog
View file

@ -1,3 +1,17 @@
2000-07-14 Nick Clifton <nickc@cygnus.com>
* config/tc-mips.c (mips_disable_float_construction): New
static variable. Set to true if doubles should not be
constructed by loading two single width fp registers with
halves of the value.
(mips_ip): Test mips_disable_float_construction.
(md_longopts): Add command line switches --construct-floats
and --no-construct-floats.
(md_parse_option): Parse new command line options.
(md_show_usage): Describe new command line options.
* doc/c-mips.texi: Document new command line options.
2000-07-13 Koundinya K <kk@ddeorg.soft.net>
* configure.in: Remove the test /usr/dde for mips-*-sysv4*MP*

40
gas/config/tc-mips.c
View file

@ -313,6 +313,14 @@ static int mips_big_got;
instructions. */
static int mips_trap;
/* 1 if double width floating point constants should not be constructed
by a assembling two single width halves into two single width floating
point registers which just happen to alias the double width destination
register. On some architectures this aliasing can be disabled by a bit
in the status register, and the settin gof this bit cannot be determined
automatically at assemble time. */
static int mips_disable_float_construction;
/* Non-zero if any .set noreorder directives were used. */
static int mips_any_noreorder;
@ -7601,6 +7609,7 @@ mips_ip (str, ip)
imm_expr.X_add_number = bfd_getb32 (temp);
}
else if (length > 4
&& ! mips_disable_float_construction
&& ((temp[0] == 0 && temp[1] == 0)
|| (temp[2] == 0 && temp[3] == 0))
&& ((temp[4] == 0 && temp[5] == 0)
@ -8826,6 +8835,10 @@ struct option md_longopts[] = {
{"mcpu", required_argument, NULL, OPTION_MCPU},
#define OPTION_MEMBEDDED_PIC (OPTION_MD_BASE + 6)
{"membedded-pic", no_argument, NULL, OPTION_MEMBEDDED_PIC},
#define OPTION_CALL_SHARED (OPTION_MD_BASE + 7)
#define OPTION_NON_SHARED (OPTION_MD_BASE + 8)
#define OPTION_TRAP (OPTION_MD_BASE + 9)
{"trap", no_argument, NULL, OPTION_TRAP},
{"no-break", no_argument, NULL, OPTION_TRAP},
@ -8848,16 +8861,21 @@ struct option md_longopts[] = {
{"m4100", no_argument, NULL, OPTION_M4100},
#define OPTION_NO_M4100 (OPTION_MD_BASE + 18)
{"no-m4100", no_argument, NULL, OPTION_NO_M4100},
#define OPTION_XGOT (OPTION_MD_BASE + 19)
#define OPTION_32 (OPTION_MD_BASE + 20)
#define OPTION_64 (OPTION_MD_BASE + 21)
#define OPTION_MIPS16 (OPTION_MD_BASE + 22)
{"mips16", no_argument, NULL, OPTION_MIPS16},
#define OPTION_NO_MIPS16 (OPTION_MD_BASE + 23)
{"no-mips16", no_argument, NULL, OPTION_NO_MIPS16},
#define OPTION_M3900 (OPTION_MD_BASE + 26)
{"m3900", no_argument, NULL, OPTION_M3900},
#define OPTION_NO_M3900 (OPTION_MD_BASE + 27)
{"no-m3900", no_argument, NULL, OPTION_NO_M3900},
#define OPTION_MABI (OPTION_MD_BASE + 38)
{"mabi", required_argument, NULL, OPTION_MABI},
@ -8866,11 +8884,6 @@ struct option md_longopts[] = {
#define OPTION_NO_M7000_HILO_FIX (OPTION_MD_BASE + 40)
{"no-fix-7000", no_argument, NULL, OPTION_NO_M7000_HILO_FIX},
#define OPTION_CALL_SHARED (OPTION_MD_BASE + 7)
#define OPTION_NON_SHARED (OPTION_MD_BASE + 8)
#define OPTION_XGOT (OPTION_MD_BASE + 19)
#define OPTION_32 (OPTION_MD_BASE + 20)
#define OPTION_64 (OPTION_MD_BASE + 21)
#ifdef OBJ_ELF
{"KPIC", no_argument, NULL, OPTION_CALL_SHARED},
{"xgot", no_argument, NULL, OPTION_XGOT},
@ -8885,6 +8898,12 @@ struct option md_longopts[] = {
{"mgp32", no_argument, NULL, OPTION_GP32},
{"mgp64", no_argument, NULL, OPTION_GP64},
#define OPTION_CONSTRUCT_FLOATS (OPTION_MD_BASE + 43)
{"construct-floats", no_argument, NULL, OPTION_CONSTRUCT_FLOATS},
#define OPTION_NO_CONSTRUCT_FLOATS (OPTION_MD_BASE + 44)
{"no-construct-floats", no_argument, NULL, OPTION_NO_CONSTRUCT_FLOATS},
{NULL, no_argument, NULL, 0}
};
size_t md_longopts_size = sizeof(md_longopts);
@ -8896,6 +8915,14 @@ md_parse_option (c, arg)
{
switch (c)
{
case OPTION_CONSTRUCT_FLOATS:
mips_disable_float_construction = 0;
break;
case OPTION_NO_CONSTRUCT_FLOATS:
mips_disable_float_construction = 1;
break;
case OPTION_TRAP:
mips_trap = 1;
break;
@ -9338,6 +9365,7 @@ MIPS options:\n\
fprintf(stream, _("\
-O0 remove unneeded NOPs, do not swap branches\n\
-O remove unneeded NOPs and swap branches\n\
--[no-]construct-floats [dis]allow floating point values to be constructed\n\
--trap, --no-break trap exception on div by 0 and mult overflow\n\
--break, --no-trap break exception on div by 0 and mult overflow\n"));
#ifdef OBJ_ELF

15
gas/doc/c-mips.texi
View file

@ -151,6 +151,21 @@ other assemblers, which use it to turn off C style preprocessing. With
@sc{gnu} @code{@value{AS}}, there is no need for @samp{-nocpp}, because the
@sc{gnu} assembler itself never runs the C preprocessor.
@item --construct-floats
@itemx --no-construct-floats
@cindex --construct-floats
@cindex --no-construct-floats
The @code{--no-construct-floats} option disables the construction of
double width floating point constants by loading the two halves of the
value into the two single width floating point registers that make up
the double width register. This feature is useful if the processor
support the FR bit in its status register, and this bit is known (by
the programmer) to be set. This bit prevents the aliasing of the double
width register by the single width registers.
By default @code {--construct-floats} is selected, allowing construction
of these floating point constants.
@item --trap
@itemx --no-break
@c FIXME! (1) reflect these options (next item too) in option summaries;