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nios2: Add -mcustom-fpu-cfg=fph2

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The new -mcustom-fpu-cfg=fph2 option variant is useful to build a
multilib for the "Nios II Floating Point Hardware 2 Component":

https://www.intel.com/content/dam/www/programmable/us/en/pdfs/literature/ug/ug_nios2_custom_instruction.pdf

Directly using the corresponding -mcustom-insn=N options for this
floating-point unit leads to a combinatorial explosion in the potential
count of multilibs which may break the build.

gcc/

	* config/nios2/nios2.c (NIOS2_FPU_CONFIG_NUM): Adjust value.
	(nios2_init_fpu_configs): Provide register values for new
	-mcustom-fpu-cfg=fph2 option variant.
	* doc/invoke.texi (-mcustom-fpu-cfg=fph2): Document new option
	variant.
This commit is contained in:
Sebastian Huber 2021-01-14 19:09:36 +01:00
parent 7e02426ba0
commit 42f4e23992
2 changed files with 50 additions and 1 deletions
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23
gcc/config/nios2/nios2.c
View file

@ -1208,7 +1208,7 @@ struct nios2_fpu_config
int code[n2fpu_code_num];
};
#define NIOS2_FPU_CONFIG_NUM 3
#define NIOS2_FPU_CONFIG_NUM 4
static struct nios2_fpu_config custom_fpu_config[NIOS2_FPU_CONFIG_NUM];
static void
@ -1252,6 +1252,27 @@ nios2_init_fpu_configs (void)
cfg->code[n2fpu_fsubs] = 254;
cfg->code[n2fpu_fdivs] = 255;
NEXT_FPU_CONFIG;
cfg->name = "fph2";
cfg->code[n2fpu_fabss] = 224;
cfg->code[n2fpu_fnegs] = 225;
cfg->code[n2fpu_fcmpnes] = 226;
cfg->code[n2fpu_fcmpeqs] = 227;
cfg->code[n2fpu_fcmpges] = 228;
cfg->code[n2fpu_fcmpgts] = 229;
cfg->code[n2fpu_fcmples] = 230;
cfg->code[n2fpu_fcmplts] = 231;
cfg->code[n2fpu_fmaxs] = 232;
cfg->code[n2fpu_fmins] = 233;
cfg->code[n2fpu_round] = 248;
cfg->code[n2fpu_fixsi] = 249;
cfg->code[n2fpu_floatis] = 250;
cfg->code[n2fpu_fsqrts] = 251;
cfg->code[n2fpu_fmuls] = 252;
cfg->code[n2fpu_fadds] = 253;
cfg->code[n2fpu_fsubs] = 254;
cfg->code[n2fpu_fdivs] = 255;
#undef NEXT_FPU_CONFIG
gcc_assert (i == NIOS2_FPU_CONFIG_NUM);
}

28
gcc/doc/invoke.texi
View file

@ -26121,6 +26121,26 @@ Currently, the following sets are defined:
-mcustom-fdivs=255 @gol
-fsingle-precision-constant}
@option{-mcustom-fpu-cfg=fph2} is equivalent to:
@gccoptlist{-mcustom-fabss=224 @gol
-mcustom-fnegs=225 @gol
-mcustom-fcmpnes=226 @gol
-mcustom-fcmpeqs=227 @gol
-mcustom-fcmpges=228 @gol
-mcustom-fcmpgts=229 @gol
-mcustom-fcmples=230 @gol
-mcustom-fcmplts=231 @gol
-mcustom-fmaxs=232 @gol
-mcustom-fmins=233 @gol
-mcustom-round=248 @gol
-mcustom-fixsi=249 @gol
-mcustom-floatis=250 @gol
-mcustom-fsqrts=251 @gol
-mcustom-fmuls=252 @gol
-mcustom-fadds=253 @gol
-mcustom-fsubs=254 @gol
-mcustom-fdivs=255 @gol}
Custom instruction assignments given by individual
@option{-mcustom-@var{insn}=} options override those given by
@option{-mcustom-fpu-cfg=}, regardless of the
@ -26131,6 +26151,14 @@ configuration by using the @code{target("custom-fpu-cfg=@var{name}")}
function attribute (@pxref{Function Attributes})
or pragma (@pxref{Function Specific Option Pragmas}).
The name @var{fph2} is an abbreviation for @emph{Nios II Floating Point
Hardware 2 Component}. Please note that the custom instructions enabled by
@option{-mcustom-fmins=233} and @option{-mcustom-fmaxs=234} are only generated
if @option{-ffinite-math-only} is specified. The custom instruction enabled by
@option{-mcustom-round=248} is only generated if @option{-fno-math-errno} is
specified. In contrast to the other configurations,
@option{-fsingle-precision-constant} is not set.
@end table
These additional @samp{-m} options are available for the Altera Nios II