re PR inline-asm/84941 (internal compiler error: in reg_overlap_mentioned_p, at…

re PR inline-asm/84941 (internal compiler error: in reg_overlap_mentioned_p, at rtlanal.c:1870 (reg_overlap_mentioned_p()/match_asm_constraints_1()))

	PR inline-asm/84941
	* function.c (match_asm_constraints_1): Don't do the optimization
	if input isn't a REG, SUBREG, MEM or constant.

	* gcc.dg/pr84941.c: New test.

From-SVN: r258764

gcc/ChangeLog

+2018-03-22  Jakub Jelinek  <jakub@redhat.com>
+
+	PR inline-asm/84941
+	* function.c (match_asm_constraints_1): Don't do the optimization
+	if input isn't a REG, SUBREG, MEM or constant.
+
 2018-03-22  Tom de Vries  <tom@codesourcery.com>
 
 	PR tree-optimization/84956

gcc/function.c

@@ -6662,7 +6662,9 @@ match_asm_constraints_1 (rtx_insn *insn, rtx *p_sets, int noutputs)
       if (! REG_P (output)
 	  || rtx_equal_p (output, input)
 	  || (GET_MODE (input) != VOIDmode
-	      && GET_MODE (input) != GET_MODE (output)))
+	      && GET_MODE (input) != GET_MODE (output))
+	  || !(REG_P (input) || SUBREG_P (input)
+	       || MEM_P (input) || CONSTANT_P (input)))
 	continue;
 
       /* We can't do anything if the output is also used as input,

gcc/testsuite/ChangeLog

+2018-03-22  Jakub Jelinek  <jakub@redhat.com>
+
+	PR inline-asm/84941
+	* gcc.dg/pr84941.c: New test.
+
 2018-03-22  Tom de Vries  <tom@codesourcery.com>
 
 	PR tree-optimization/84956

gcc/testsuite/gcc.dg/pr84941.c

+/* PR inline-asm/84941 */
+/* { dg-do compile } */
+/* { dg-options "-O2" } */
+
+void
+foo (void)
+{
+  short *b[1] = { 0 };
+  asm volatile ("" : "=m,m" (b), "=r,r" (b) : "1,p" (b));
+}