re PR middle-end/53698 (ICE: in plus_constant, at explow.c:88 with -O -mx32 -maddress-mode=long -fno-tree-dominator-opts)

gcc/
	PR middle-end/53698
	* expr.c (expand_expr_addr_expr_1): Convert to tmode before
	performing an addition.

gcc/testsuite/
	PR middle-end/53698
	* gcc.target/i386/pr53698.c: New test.

From-SVN: r188725