From: Segher Boessenkool <segher@kernel.crashing.org>
Date: Fri, 3 Nov 2017 00:19:06 +0000 (+0100)
Subject: combine: Print insns we try to combine
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=f53bd856482af56a7af70bbae243f0c2af296b0e;p=gcc.git

combine: Print insns we try to combine

This adds some extra debug info to the dump file for combine: print
the insns that are input to try_combine.  I was worried printing more
will make the dump file only harder to read, but especially the info
from the REG_DEAD notes is invaluable.


	* combine (try_combine): Print the insns input to try_combine to the
	dump file.

From-SVN: r254365
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index d7a6f39287a..7502184f7db 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2017-11-02  Segher Boessenkool  <segher@kernel.crashing.org>
+
+	* combine (try_combine): Print the insns input to try_combine to the
+	dump file.
+
 2017-11-02  Steve Ellcey  <sellcey@cavium.com>
 
 	PR target/79868
diff --git a/gcc/combine.c b/gcc/combine.c
index 968e6871e99..eab10c599a6 100644
--- a/gcc/combine.c
+++ b/gcc/combine.c
@@ -2771,6 +2771,13 @@ try_combine (rtx_insn *i3, rtx_insn *i2, rtx_insn *i1, rtx_insn *i0,
       else
 	fprintf (dump_file, "\nTrying %d -> %d:\n",
 		 INSN_UID (i2), INSN_UID (i3));
+
+      if (i0)
+	dump_insn_slim (dump_file, i0);
+      if (i1)
+	dump_insn_slim (dump_file, i1);
+      dump_insn_slim (dump_file, i2);
+      dump_insn_slim (dump_file, i3);
     }
 
   /* If multiple insns feed into one of I2 or I3, they can be in any