re PR target/57106 (-fcompare-debug failure with -O2 -fschedule-insns -funroll-all-loops)

	PR target/57106
	* config/i386/i386.c (add_parameter_dependencies): Add dependence
	between "first_arg" and "insn", not "last" and "insn".

testsuite/ChangeLog:

	PR target/57106
	* gcc.target/i386/pr57106.c: New test.

From-SVN: r198629

gcc/config/i386/i386.c

@@ -24662,7 +24662,7 @@ add_parameter_dependencies (rtx call, rtx head)
 	  /* Add output depdendence between two function arguments if chain
 	     of output arguments contains likely spilled HW registers.  */
 	  if (is_spilled)
-	    add_dependence (last, insn, REG_DEP_OUTPUT);
+	    add_dependence (first_arg, insn, REG_DEP_OUTPUT);
 	  first_arg = last = insn;
 	}
       else
@@ -41355,7 +41355,8 @@ ix86_enum_va_list (int idx, const char **pname, tree *ptree)
 #undef TARGET_SCHED_ADJUST_PRIORITY
 #define TARGET_SCHED_ADJUST_PRIORITY ix86_adjust_priority
 #undef TARGET_SCHED_DEPENDENCIES_EVALUATION_HOOK
-#define TARGET_SCHED_DEPENDENCIES_EVALUATION_HOOK ix86_dependencies_evaluation_hook
+#define TARGET_SCHED_DEPENDENCIES_EVALUATION_HOOK \
+  ix86_dependencies_evaluation_hook
 
 /* The size of the dispatch window is the total number of bytes of
    object code allowed in a window.  */

gcc/testsuite/gcc.target/i386/pr57106.c

+/* { dg-do compile } */
+/* { dg-options "-O2 -fschedule-insns -funroll-all-loops -fcompare-debug" } */
+
+typedef void block128_f (int *, int);
+
+void
+foo (int *out, int *iv, block128_f block)
+{
+  while (1)
+    {
+      *out = *out ^ *iv;
+      block (out, *out);
+      iv = out;
+    }
+}