@@ -17314,8 +17314,9 @@ rs6000_adjust_atomic_subword (rtx orig_mem, rtx *pshift, rtx *pmask)
shift = gen_reg_rtx (SImode);
addr = gen_lowpart (SImode, addr);
emit_insn (gen_rlwinm (shift, addr, GEN_INT (3), GEN_INT (shift_mask)));
- shift = expand_simple_binop (SImode, XOR, shift, GEN_INT (shift_mask),
- shift, 1, OPTAB_LIB_WIDEN);
+ if (WORDS_BIG_ENDIAN)
+ shift = expand_simple_binop (SImode, XOR, shift, GEN_INT (shift_mask),
+ shift, 1, OPTAB_LIB_WIDEN);
*pshift = shift;
/* Mask for insertion. */