lower-subreg.c (resolve_clobber): If the clobber has a LIBCALL note, just delete the insn.

	* lower-subreg.c (resolve_clobber): If the clobber has a LIBCALL
	note, just delete the insn.

From-SVN: r127273

2 files changed, 14 insertions, 0 deletions

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 9e0e4bffc9d..fa267ee2c7f 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2007-08-07  Ian Lance Taylor  <iant@google.com>
+
+	* lower-subreg.c (resolve_clobber): If the clobber has a LIBCALL
+	note, just delete the insn.
+
 2007-08-07  Andreas Schwab  <schwab@suse.de>
 
 	PR bootstrap/32973
diff --git a/gcc/lower-subreg.c b/gcc/lower-subreg.c
index 4cb2ca8cabe..288566d87b5 100644
--- a/gcc/lower-subreg.c
+++ b/gcc/lower-subreg.c
@@ -906,6 +906,15 @@ resolve_clobber (rtx pat, rtx insn)
   if (!resolve_reg_p (reg) && !resolve_subreg_p (reg))
     return false;
 
+  /* If this clobber has a REG_LIBCALL note, then it is the initial
+     clobber added by emit_no_conflict_block.  We were able to
+     decompose the register, so we no longer need the clobber.  */
+  if (find_reg_note (insn, REG_LIBCALL, NULL_RTX) != NULL_RTX)
+    {
+      delete_insn (insn);
+      return true;
+    }
+
   orig_mode = GET_MODE (reg);
   words = GET_MODE_SIZE (orig_mode);
   words = (words + UNITS_PER_WORD - 1) / UNITS_PER_WORD;