From: Jakub Jelinek <jakub@redhat.com>
Date: Sat, 27 Jan 2018 06:28:15 +0000 (+0100)
Subject: re PR middle-end/84040 (compilation time of gcc.c-torture/compile/limits-blockid... 
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=0f06be5a06718ce7b670f4ffe9f971a830381757;p=gcc.git

re PR middle-end/84040 (compilation time of gcc.c-torture/compile/limits-blockid.c is 50x slower)

	PR middle-end/84040
	* sched-deps.c (sched_macro_fuse_insns): Return immediately for
	debug insns.

From-SVN: r257119
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index bcf3ffd079f..f2699e0c0d0 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2018-01-27  Jakub Jelinek  <jakub@redhat.com>
+
+	PR middle-end/84040
+	* sched-deps.c (sched_macro_fuse_insns): Return immediately for
+	debug insns.
+
 2018-01-26  Jim Wilson  <jimw@sifive.com>
 
 	* config/riscv/riscv.h (MAX_FIXED_MODE_SIZE): New.
diff --git a/gcc/sched-deps.c b/gcc/sched-deps.c
index 3971861e5ef..2d0199d5837 100644
--- a/gcc/sched-deps.c
+++ b/gcc/sched-deps.c
@@ -2834,10 +2834,16 @@ static void
 sched_macro_fuse_insns (rtx_insn *insn)
 {
   rtx_insn *prev;
+  /* No target hook would return true for debug insn as any of the
+     hook operand, and with very large sequences of only debug insns
+     where on each we call sched_macro_fuse_insns it has quadratic
+     compile time complexity.  */
+  if (DEBUG_INSN_P (insn))
+    return;
   prev = prev_nonnote_nondebug_insn (insn);
   if (!prev)
     return;
- 
+
   if (any_condjump_p (insn))
     {
       unsigned int condreg1, condreg2;