diff --git a/gcc/reg-stack.cc b/gcc/reg-stack.cc
index fd03250..95e0e61 100644
--- a/gcc/reg-stack.cc
+++ b/gcc/reg-stack.cc
@@ -1073,7 +1073,8 @@ move_for_stack_reg (rtx_insn *insn, stack_ptr regstack, rtx pat)
 	      break;
 
 	  /* The destination must be dead, or life analysis is borked.  */
-	  gcc_assert (get_hard_regnum (regstack, dest) < FIRST_STACK_REG);
+	  gcc_assert (get_hard_regnum (regstack, dest) < FIRST_STACK_REG
+		      || any_malformed_asm);
 
 	  /* If the source is not live, this is yet another case of
 	     uninitialized variables.  Load up a NaN instead.  */
diff --git a/gcc/testsuite/g++.dg/ext/pr106877.C b/gcc/testsuite/g++.dg/ext/pr106877.C
new file mode 100644
index 0000000..6bffed9
--- /dev/null
+++ b/gcc/testsuite/g++.dg/ext/pr106877.C
@@ -0,0 +1,13 @@
+// PR target/106877
+// { dg-do compile { target i?86-*-* x86_64-*-* } }
+// { dg-options "-O1 -m16 -mtune=sandybridge -flive-range-shrinkage -fno-dce" }
+
+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));
+    }
+}