Re: [PATCH, rs6000] enable early debug and disable switch for gimple folding
On Tue, 2017-08-08 at 17:31 -0500, Segher Boessenkool wrote:
> Hi!
>
> On Tue, Aug 08, 2017 at 04:14:56PM -0500, Will Schmidt wrote:
> > * config/rs6000/rs6000.c: rs6000_option_override_internal() Add
> > blurb
> > to indicate when early gimple folding has been disabled.
>
> * config/rs6000/rs6000.c (rs6000_option_override_internal): ...
>
>
> > rs6000_gimple_fold_builtin(): Add debug content.
>
> (rs6000_gimple_fold_builtin): ...
>
> > @@ -16157,10 +16161,26 @@ rs6000_gimple_fold_builtin (gimple_stmt_iterator
> > *gsi)
> >gcc_checking_assert (fndecl && DECL_BUILT_IN_CLASS (fndecl) ==
> > BUILT_IN_MD);
> >enum rs6000_builtins fn_code
> > = (enum rs6000_builtins) DECL_FUNCTION_CODE (fndecl);
> >tree arg0, arg1, lhs;
> >
> > + size_t uns_fncode = (size_t)fn_code;
>
> Space after cast. More of this in the rest of the patch.
>
> > + if (TARGET_DEBUG_BUILTIN)
> > + {
> > + fprintf (stderr, "rs6000_gimple_fold_builtin %d %s %s \n",
> > + fn_code,fn_name1,fn_name2);
>
> No space before \n, space after commas.
>
> > + if (rs6000_gimple_folding_disable)
> > + return false;
>
> One space indented too many there.
>
> > diff --git a/gcc/config/rs6000/rs6000.opt b/gcc/config/rs6000/rs6000.opt
> > index e94aa07..4372b00 100644
> > --- a/gcc/config/rs6000/rs6000.opt
> > +++ b/gcc/config/rs6000/rs6000.opt
> > @@ -146,10 +146,14 @@ Generate AltiVec instructions using little-endian
> > element order.
> >
> > maltivec=be
> > Target Report RejectNegative Var(rs6000_altivec_element_order, 2)
> > Generate AltiVec instructions using big-endian element order.
> >
> > +mgimple-folding=off
> > +Target Report RejectNegative Var(rs6000_gimple_folding_disable, 1)
> > +Disable early gimple folding of builtins.
>
> Please use -mgimple-folding instead, or better, -mfold-gimple, along
> with its no- variant? So no RejectNegative.
>
> It's probably easier to read if the internal var is the positive
> version, too?
Thanks for the review. (v2) incoming momentarily.
>
>
> Segher
>
Re: [PATCH, rs6000] enable early debug and disable switch for gimple folding
Hi!
On Tue, Aug 08, 2017 at 04:14:56PM -0500, Will Schmidt wrote:
> * config/rs6000/rs6000.c: rs6000_option_override_internal() Add blurb
> to indicate when early gimple folding has been disabled.
* config/rs6000/rs6000.c (rs6000_option_override_internal): ...
> rs6000_gimple_fold_builtin(): Add debug content.
(rs6000_gimple_fold_builtin): ...
> @@ -16157,10 +16161,26 @@ rs6000_gimple_fold_builtin (gimple_stmt_iterator
> *gsi)
>gcc_checking_assert (fndecl && DECL_BUILT_IN_CLASS (fndecl) ==
> BUILT_IN_MD);
>enum rs6000_builtins fn_code
> = (enum rs6000_builtins) DECL_FUNCTION_CODE (fndecl);
>tree arg0, arg1, lhs;
>
> + size_t uns_fncode = (size_t)fn_code;
Space after cast. More of this in the rest of the patch.
> + if (TARGET_DEBUG_BUILTIN)
> + {
> + fprintf (stderr, "rs6000_gimple_fold_builtin %d %s %s \n",
> +fn_code,fn_name1,fn_name2);
No space before \n, space after commas.
> + if (rs6000_gimple_folding_disable)
> + return false;
One space indented too many there.
> diff --git a/gcc/config/rs6000/rs6000.opt b/gcc/config/rs6000/rs6000.opt
> index e94aa07..4372b00 100644
> --- a/gcc/config/rs6000/rs6000.opt
> +++ b/gcc/config/rs6000/rs6000.opt
> @@ -146,10 +146,14 @@ Generate AltiVec instructions using little-endian
> element order.
>
> maltivec=be
> Target Report RejectNegative Var(rs6000_altivec_element_order, 2)
> Generate AltiVec instructions using big-endian element order.
>
> +mgimple-folding=off
> +Target Report RejectNegative Var(rs6000_gimple_folding_disable, 1)
> +Disable early gimple folding of builtins.
Please use -mgimple-folding instead, or better, -mfold-gimple, along
with its no- variant? So no RejectNegative.
It's probably easier to read if the internal var is the positive
version, too?
Segher
[PATCH, rs6000] enable early debug and disable switch for gimple folding
Hi,
[PATCH, rs6000] enable early debug and disable switch for gimple folding
Enable debug options related to gimple folding for the rs6000 target.
Adds some output to the existing -mdebug=builtin option
Add a -mgimple-folding=off option to disable the early rs6000 gimple folding.
OK for trunk?
Thanks,
-Will
[gcc]
2017-08-08 Will Schmidt
* config/rs6000/rs6000.c: rs6000_option_override_internal() Add blurb
to indicate when early gimple folding has been disabled.
rs6000_gimple_fold_builtin(): Add debug content.
diff --git a/gcc/config/rs6000/rs6000.c b/gcc/config/rs6000/rs6000.c
index 1fb9861..0466fd0 100644
--- a/gcc/config/rs6000/rs6000.c
+++ b/gcc/config/rs6000/rs6000.c
@@ -4180,10 +4180,14 @@ rs6000_option_override_internal (bool global_init_p)
{
warning (0, N_("-maltivec=le not allowed for big-endian targets"));
rs6000_altivec_element_order = 0;
}
+ if (rs6000_gimple_folding_disable)
+ fprintf (stderr,
+ "gimple folding of rs6000 builtins has been disabled.\n");
+
/* Add some warnings for VSX. */
if (TARGET_VSX)
{
const char *msg = NULL;
if (!TARGET_HARD_FLOAT || !TARGET_SINGLE_FLOAT || !TARGET_DOUBLE_FLOAT)
@@ -16157,10 +16161,26 @@ rs6000_gimple_fold_builtin (gimple_stmt_iterator *gsi)
gcc_checking_assert (fndecl && DECL_BUILT_IN_CLASS (fndecl) == BUILT_IN_MD);
enum rs6000_builtins fn_code
= (enum rs6000_builtins) DECL_FUNCTION_CODE (fndecl);
tree arg0, arg1, lhs;
+ size_t uns_fncode = (size_t)fn_code;
+ enum insn_code icode = rs6000_builtin_info[uns_fncode].icode;
+ const char *fn_name1 = rs6000_builtin_info[uns_fncode].name;
+ const char *fn_name2 = ((icode != CODE_FOR_nothing)
+ ? get_insn_name ((int)icode)
+ : "nothing");
+
+ if (TARGET_DEBUG_BUILTIN)
+ {
+ fprintf (stderr, "rs6000_gimple_fold_builtin %d %s %s \n",
+ fn_code,fn_name1,fn_name2);
+ }
+
+ if (rs6000_gimple_folding_disable)
+ return false;
+
/* Generic solution to prevent gimple folding of code without a LHS. */
if (!gimple_call_lhs (stmt))
return false;
switch (fn_code)
@@ -16516,10 +16536,13 @@ rs6000_gimple_fold_builtin (gimple_stmt_iterator *gsi)
gsi_insert_seq_before (gsi, stmts, GSI_SAME_STMT);
update_call_from_tree (gsi, res);
return true;
}
default:
+ if (TARGET_DEBUG_BUILTIN)
+ fprintf (stderr, "gimple builtin intrinsic not matched:%d %s %s \n",
+ fn_code,fn_name1,fn_name2);
break;
}
return false;
}
diff --git a/gcc/config/rs6000/rs6000.opt b/gcc/config/rs6000/rs6000.opt
index e94aa07..4372b00 100644
--- a/gcc/config/rs6000/rs6000.opt
+++ b/gcc/config/rs6000/rs6000.opt
@@ -146,10 +146,14 @@ Generate AltiVec instructions using little-endian element
order.
maltivec=be
Target Report RejectNegative Var(rs6000_altivec_element_order, 2)
Generate AltiVec instructions using big-endian element order.
+mgimple-folding=off
+Target Report RejectNegative Var(rs6000_gimple_folding_disable, 1)
+Disable early gimple folding of builtins.
+
mhard-dfp
Target Report Mask(DFP) Var(rs6000_isa_flags)
Use decimal floating point instructions.
mmulhw
