1 files changed, 13 insertions, 0 deletions
diff --git a/gcc/expr.c b/gcc/expr.c
index 50a2035..82c0371 100644
--- a/gcc/expr.c
+++ b/gcc/expr.c
@@ -8423,6 +8423,19 @@ expand_expr_real_1 (tree exp, rtx target, enum machine_mode tmode,
     expand_decl_rtl:
       gcc_assert (decl_rtl);
       decl_rtl = copy_rtx (decl_rtl);
+      /* Record writes to register variables.  */
+      if (modifier == EXPAND_WRITE && REG_P (decl_rtl)
+	  && REGNO (decl_rtl) < FIRST_PSEUDO_REGISTER)
+	{
+	    int i = REGNO (decl_rtl);
+	    int nregs = hard_regno_nregs[i][GET_MODE (decl_rtl)];
+	    while (nregs)
+	      {
+		SET_HARD_REG_BIT (crtl->asm_clobbers, i);
+		i++;
+		nregs--;
+	      }
+	}
 
       /* Ensure variable marked as used even if it doesn't go through
 	 a parser.  If it hasn't be used yet, write out an external