re PR middle-end/79909 (ICE error: invalid rtl sharing found in the insn on ppc64le)

	PR rtl-optimization/79909
	* combine.c (try_combine): Use simplify_replace_rtx on individual
	CALL_INSN_FUNCTION_USAGE elements instead of replace_rtx on copy_rtx
	of the whole CALL_INSN_FUNCTION_USAGE.

	* gcc.target/powerpc/pr79909.c: New test.

From-SVN: r246023

gcc/ChangeLog

 2017-03-10  Jakub Jelinek  <jakub@redhat.com>
 
+	PR rtl-optimization/79909
+	* combine.c (try_combine): Use simplify_replace_rtx on individual
+	CALL_INSN_FUNCTION_USAGE elements instead of replace_rtx on copy_rtx
+	of the whole CALL_INSN_FUNCTION_USAGE.
+
 	PR tree-optimization/79972
 	* gimple-ssa-warn-alloca.c (alloca_call_type): Only call
 	get_range_info on SSA_NAMEs.  Formatting fixes.

gcc/combine.c

@@ -4293,26 +4293,25 @@ try_combine (rtx_insn *i3, rtx_insn *i2, rtx_insn *i1, rtx_insn *i0,
 
     if (CALL_P (i3) && CALL_INSN_FUNCTION_USAGE (i3))
       {
-	rtx call_usage = CALL_INSN_FUNCTION_USAGE (i3);
-
-	reset_used_flags (call_usage);
-	call_usage = copy_rtx (call_usage);
-
-	if (substed_i2)
+	for (rtx link = CALL_INSN_FUNCTION_USAGE (i3); link;
+	     link = XEXP (link, 1))
 	  {
-	    /* I2SRC must still be meaningful at this point.  Some splitting
-	       operations can invalidate I2SRC, but those operations do not
-	       apply to calls.  */
-	    gcc_assert (i2src);
-	    replace_rtx (call_usage, i2dest, i2src);
+	    if (substed_i2)
+	      {
+		/* I2SRC must still be meaningful at this point.  Some
+		   splitting operations can invalidate I2SRC, but those
+		   operations do not apply to calls.  */
+		gcc_assert (i2src);
+		XEXP (link, 0) = simplify_replace_rtx (XEXP (link, 0),
+						       i2dest, i2src);
+	      }
+	    if (substed_i1)
+	      XEXP (link, 0) = simplify_replace_rtx (XEXP (link, 0),
+						     i1dest, i1src);
+	    if (substed_i0)
+	      XEXP (link, 0) = simplify_replace_rtx (XEXP (link, 0),
+						     i0dest, i0src);
 	  }
-
-	if (substed_i1)
-	  replace_rtx (call_usage, i1dest, i1src);
-	if (substed_i0)
-	  replace_rtx (call_usage, i0dest, i0src);
-
-	CALL_INSN_FUNCTION_USAGE (i3) = call_usage;
       }
 
     if (undobuf.other_insn)

gcc/testsuite/ChangeLog

 2017-03-10  Jakub Jelinek  <jakub@redhat.com>
 
+	PR rtl-optimization/79909
+	* gcc.target/powerpc/pr79909.c: New test.
+
 	PR tree-optimization/79972
 	* gcc.dg/pr79972.c: New test.
 

gcc/testsuite/gcc.target/powerpc/pr79909.c

+/* PR rtl-optimization/79909 */
+/* { dg-do compile } */
+/* { dg-options "-O2 -mxl-compat" } */
+
+typedef float T __attribute__ ((mode (TD)));
+T b, c, d, e, f, g;
+void bar (T, T, T, T, T, T);
+
+void
+foo (void)
+{
+  bar (e, b, f, c, g, d);
+}