From: Richard Henderson <rth@redhat.com>
Date: Thu, 11 Oct 2001 06:55:16 +0000 (-0700)
Subject: * combine.c (try_combine): Handle a SEQUENCE of one insn.
X-Git-Tag: prereleases/libstdc++-3.0.95~1685
X-Git-Url: https://gcc.gnu.org/git/?a=commitdiff_plain;h=7f16eed442ca3fe62781be3711e4fcd514f91769;p=gcc.git

* combine.c (try_combine): Handle a SEQUENCE of one insn.

From-SVN: r46177
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 1b06df2be1d3..90ff4bc645b9 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,12 @@
+2001-10-10  Richard Henderson  <rth@redhat.com>
+
+        * combine.c (try_combine): Handle a SEQUENCE of one insn.
+
+2001-10-10  Richard Henderson  <rth@redhat.com>
+
+	* langhooks.c: Include langhooks.h.
+	* Makefile.in (langhooks.o): Depend on it.
+
 Wed Oct 10 23:49:06 EDT 2001  John Wehle  (john@feith.com)
 
 	* rtlanal.c (noop_move_p): Insns with a REG_RETVAL note
diff --git a/gcc/combine.c b/gcc/combine.c
index 43b1b9e9a191..12225db3c12d 100644
--- a/gcc/combine.c
+++ b/gcc/combine.c
@@ -2132,6 +2132,12 @@ try_combine (i3, i2, i1, new_direct_jump_p)
 	    }
 	}
 
+      /* If we've split a jump pattern, we'll wind up with a sequence even
+	 with one instruction.  We can handle that below, so extract it.  */
+      if (m_split && GET_CODE (m_split) == SEQUENCE
+	  && XVECLEN (m_split, 0) == 1)
+	m_split = PATTERN (XVECEXP (m_split, 0, 0));
+
       if (m_split && GET_CODE (m_split) != SEQUENCE)
 	{
 	  insn_code_number = recog_for_combine (&m_split, i3, &new_i3_notes);