"Bingfeng Mei" <b...@broadcom.com> writes: > Here the bitpos = 0, bitsize = 52. HOST_WIDE_INT for our processor > is 32, though 64-bit long long type is supported. The marked > statement produces a mask of 0xfffff, thus causes the upper 32-bit > removed later. Is this a potential bug, or did I miss something?
gcc requires that the size of HOST_WIDE_INT be at least as large as BITS_PER_WORD. In your case BITS_PER_WORD is presumably 64; if it is not, then the condition at the start of optimize_bitfield_assignment_op should have returned false immediately. See need_64bit_hwint in config.gcc. Ian
