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[PATCH, rs6000] enable early debug and disable switch for gimple folding
- From: Will Schmidt <will_schmidt at vnet dot ibm dot com>
- To: GCC Patches <gcc-patches at gcc dot gnu dot org>
- Cc: Segher Boessenkool <segher at kernel dot crashing dot org>, Richard Biener <richard dot guenther at gmail dot com>, Bill Schmidt <wschmidt at linux dot vnet dot ibm dot com>, David Edelsohn <dje dot gcc at gmail dot com>
- Date: Tue, 08 Aug 2017 16:14:56 -0500
- Subject: [PATCH, rs6000] enable early debug and disable switch for gimple folding
- Authentication-results: sourceware.org; auth=none
- Reply-to: will_schmidt at vnet dot ibm dot com
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 <will_schmidt@vnet.ibm.com>
* 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