https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109927#c21
From 6178fddd3e0957fbb8bcfc443fef172691b7640b Mon Sep 17 00:00:00 2001
From: Tamar Christina <tamar.christina@arm.com>
Date: Fri, 5 May 2023 13:35:17 +0100
Subject: [PATCH 01/15] match.pd: don't emit label if not needed
This is a small QoL codegen improvement for match.pd to not emit labels when
they are not needed. The codegen is nice and there is a small (but consistent)
improvement in compile time.
gcc/ChangeLog:
PR bootstrap/84402
* genmatch.cc (dt_simplify::gen_1): Only emit labels if used.
(cherry picked from commit 580cda3c2799b1f8323af770e52f1eb0fa204718)
---
gcc/genmatch.cc | 30 ++++++++++++++++++++++--------
1 file changed, 22 insertions(+), 8 deletions(-)
diff --git a/gcc/genmatch.cc b/gcc/genmatch.cc
index c1023d921fca..9ecd0a462b4f 100644
--- a/gcc/genmatch.cc
+++ b/gcc/genmatch.cc
@@ -3354,6 +3354,7 @@ dt_simplify::gen_1 (FILE *f, int indent, bool gimple, operand *result)
char local_fail_label[256];
snprintf (local_fail_label, 256, "next_after_fail%u", ++fail_label_cnt);
fail_label = local_fail_label;
+ bool needs_label = false;
/* Analyze captures and perform early-outs on the incoming arguments
that cover cases we cannot handle. */
@@ -3368,6 +3369,7 @@ dt_simplify::gen_1 (FILE *f, int indent, bool gimple, operand *result)
fprintf_indent (f, indent,
"if (TREE_SIDE_EFFECTS (_p%d)) goto %s;\n",
i, fail_label);
+ needs_label = true;
if (verbose >= 1)
warning_at (as_a <expr *> (s->match)->ops[i]->location,
"forcing toplevel operand to have no "
@@ -3383,6 +3385,7 @@ dt_simplify::gen_1 (FILE *f, int indent, bool gimple, operand *result)
fprintf_indent (f, indent,
"if (TREE_SIDE_EFFECTS (captures[%d])) "
"goto %s;\n", i, fail_label);
+ needs_label = true;
if (verbose >= 1)
warning_at (cinfo.info[i].c->location,
"forcing captured operand to have no "
@@ -3425,7 +3428,10 @@ dt_simplify::gen_1 (FILE *f, int indent, bool gimple, operand *result)
}
if (s->kind == simplify::SIMPLIFY)
- fprintf_indent (f, indent, "if (UNLIKELY (!dbg_cnt (match))) goto %s;\n", fail_label);
+ {
+ fprintf_indent (f, indent, "if (UNLIKELY (!dbg_cnt (match))) goto %s;\n", fail_label);
+ needs_label = true;
+ }
fprintf_indent (f, indent, "if (UNLIKELY (dump_file && (dump_flags & TDF_FOLDING))) "
"fprintf (dump_file, \"%s ",
@@ -3498,9 +3504,12 @@ dt_simplify::gen_1 (FILE *f, int indent, bool gimple, operand *result)
"res_op->resimplify (%s, valueize);\n",
!e->force_leaf ? "lseq" : "NULL");
if (e->force_leaf)
- fprintf_indent (f, indent,
- "if (!maybe_push_res_to_seq (res_op, NULL)) "
- "goto %s;\n", fail_label);
+ {
+ fprintf_indent (f, indent,
+ "if (!maybe_push_res_to_seq (res_op, NULL)) "
+ "goto %s;\n", fail_label);
+ needs_label = true;
+ }
}
}
else if (result->type == operand::OP_CAPTURE
@@ -3556,9 +3565,12 @@ dt_simplify::gen_1 (FILE *f, int indent, bool gimple, operand *result)
continue;
if (cinfo.info[i].result_use_count
> cinfo.info[i].match_use_count)
- fprintf_indent (f, indent,
- "if (! tree_invariant_p (captures[%d])) "
- "goto %s;\n", i, fail_label);
+ {
+ fprintf_indent (f, indent,
+ "if (! tree_invariant_p (captures[%d])) "
+ "goto %s;\n", i, fail_label);
+ needs_label = true;
+ }
}
for (unsigned j = 0; j < e->ops.length (); ++j)
{
@@ -3609,6 +3621,7 @@ dt_simplify::gen_1 (FILE *f, int indent, bool gimple, operand *result)
{
fprintf_indent (f, indent, "if (!_r)\n");
fprintf_indent (f, indent, " goto %s;\n", fail_label);
+ needs_label = true;
}
}
}
@@ -3649,7 +3662,8 @@ dt_simplify::gen_1 (FILE *f, int indent, bool gimple, operand *result)
}
indent -= 2;
fprintf_indent (f, indent, "}\n");
- fprintf (f, "%s:;\n", fail_label);
+ if (needs_label)
+ fprintf (f, "%s:;\n", fail_label);
fail_label = NULL;
}
--
2.44.0
