Xi Ruoyao via Gcc-patches <gcc-patches@gcc.gnu.org> 于2021年8月28日周六 下午3:09写道：
>
> On Fri, 2021-08-27 at 15:36 -0600, Jeff Law wrote:
>
> > It's easier when someone has to debug the code later.
> > enums show up in debug output by default, while #defines do not.
>
> > >
> > > switch (mips_isa)
> > > {
> > > case MIPS_ISA_MIPS1: return "mips1";
> > > // ...
> > > }
> > >
> > > It looks better, and (maybe) generates better code. Just my 2 cents
> > > though.
>
> > Coding standards would have that as
> >
> > switch (mips_isa)
> > {
> > case MIPS_ISA_MIPS_1:
> > return "mips1";
> > ...
> > }
>
> There is some existing code using "case ... : return ..." in one line in
> mips.c, so I thought it was standard :(.
>
> > Presumably .module is supported by all reasonably modern versions of
> > GAS?
>
> It's added by the commit in binutils-gdb:
>
> > commit 919731affbef19fcad8dddb0a595bb05755cb345
> > Author: mfortune <matthew.fort...@imgtec.com>
> > Date: Tue May 20 13:28:20 2014 +0100
> >
> > Add MIPS .module directive
> >
>
> So it should be supported since binutils-2.25.
>
> If we want to support old binutils we'll need something like "-fno-mips-
> module-directive" and "--without-mips-module-directive". My suggestion
> is just bumping the binutils requirement for mips*-*-*.
>
There is a macro, HAVE_AS_DOT_MODULE, so that we can just use it.
#ifdef HAVE_AS_DOT_MODULE
/* Record the FP ABI. See below for comments. */
if (TARGET_NO_FLOAT)
#ifdef HAVE_AS_GNU_ATTRIBUTE
fputs ("\t.gnu_attribute 4, 0\n", asm_out_file);
#else
;
#endif
else if (!TARGET_HARD_FLOAT_ABI)
fputs ("\t.module\tsoftfloat\n", asm_out_file);
else if (!TARGET_DOUBLE_FLOAT)
fputs ("\t.module\tsinglefloat\n", asm_out_file);
else if (TARGET_FLOATXX)
fputs ("\t.module\tfp=xx\n", asm_out_file);
else if (TARGET_FLOAT64)
fputs ("\t.module\tfp=64\n", asm_out_file);
else
fputs ("\t.module\tfp=32\n", asm_out_file);
if (TARGET_ODD_SPREG)
fputs ("\t.module\toddspreg\n", asm_out_file);
else
fputs ("\t.module\tnooddspreg\n", asm_out_file);
#else
Thank you for your help.
>
