https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88739
--- Comment #23 from John Dong <dongjianqiang2 at huawei dot com> ---
diff -urp a/gcc/expr.c b/gcc/expr.c
--- a/gcc/expr.c 2019-01-09 03:19:03.750205982 +0800
+++ b/gcc/expr.c 2019-01-09 03:38:23.414174738 +0800
@@ -10760,6 +10760,16 @@ expand_expr_real_1 (tree exp, rtx target
&& GET_MODE_CLASS (ext_mode) == MODE_INT)
reversep = TYPE_REVERSE_STORAGE_ORDER (type);
+ int modePrecision = GET_MODE_PRECISION (TYPE_MODE (TREE_TYPE
(tem)));
+ int typePrecision = TYPE_PRECISION (TREE_TYPE (tem));
+ int shiftSize = modePrecision - typePrecision;
+ rtx regTarget = gen_reg_rtx (GET_MODE (op0));
+
+ if (shiftSize && REG_P (op0))
+ op0 = expand_shift (LSHIFT_EXPR, GET_MODE (op0), op0,
+ shiftSize, regTarget,
+ TYPE_UNSIGNED (TREE_TYPE (tem)));
+
op0 = extract_bit_field (op0, bitsize, bitpos, unsignedp,
(modifier == EXPAND_STACK_PARM
? NULL_RTX : target),
Tried to fix the bug when expand.
