re PR inline-asm/84683 (internal compiler error: in move_for_stack_reg, at reg-stack.c:1173)

	PR inline-asm/84683
	* reg-stack.c (move_for_stack_reg): If any_malformed_asm, avoid
	assertion failure.

	* g++.dg/ext/pr84683.C: New test.

From-SVN: r258273

gcc/ChangeLog

 2018-03-06  Jakub Jelinek  <jakub@redhat.com>
 
+	PR inline-asm/84683
+	* reg-stack.c (move_for_stack_reg): If any_malformed_asm, avoid
+	assertion failure.
+
 	PR tree-optimization/84687
 	* omp-simd-clone.c (simd_clone_create): Clear DECL_BUILT_IN_CLASS
 	on new_node->decl.

gcc/reg-stack.c

@@ -1170,7 +1170,8 @@ move_for_stack_reg (rtx_insn *insn, stack_ptr regstack, rtx pat)
 	  && XINT (SET_SRC (XVECEXP (pat, 0, 1)), 1) == UNSPEC_TAN)
 	emit_swap_insn (insn, regstack, dest);
       else
-	gcc_assert (get_hard_regnum (regstack, dest) < FIRST_STACK_REG);
+	gcc_assert (get_hard_regnum (regstack, dest) < FIRST_STACK_REG
+		    || any_malformed_asm);
 
       gcc_assert (regstack->top < REG_STACK_SIZE);
 

gcc/testsuite/ChangeLog

 2018-03-06  Jakub Jelinek  <jakub@redhat.com>
 
+	PR inline-asm/84683
+	* g++.dg/ext/pr84683.C: New test.
+
 	PR tree-optimization/84687
 	* gcc.dg/pr84687.c: New test.
 

gcc/testsuite/g++.dg/ext/pr84683.C

+// PR inline-asm/84683
+// { dg-do compile { target i?86-*-* x86_64-*-* } }
+// { dg-options "-O2" }
+
+void
+foo (float b, double c)
+{
+  for (int e = 0; e < 2; e++)
+    {
+      asm volatile ("" : "+f" (c));	// { dg-error "must specify a single register" }
+      asm ("" : "+rm" (c = b));
+    }
+}