2014-06-07 15:21 GMT+08:00 Sandeep Kumar Singh <Sandeep.Singh2@xxxxxxxx>: > Hi, > > I need some help, > > The GNURX toolchain align wrong labels with option falign-labels=n, where n > is number of bytes. As per GCC manual, the GNU RX toolchain should align as > given below, The relationship between -falign-labels and expected .balign > output supposed to be: > -falign-labels=4 --> .balign 4 > -falign-labels=8 --> .balign 8 > -falign-labels=16 --> .balign 16 > > However, listed pseudo code was the like (without any optimization): > -falign-labels=1 --> .balign 2 > -falign-labels=4 --> .balign 16 > -falign-labels=8 --> .balign 256 > -falign-labels=16 --> .balign 65536 > In gcc/config/rx/rx.h, it uses align_labels to implement LABEL_ALIGN(x): #define LABEL_ALIGN(x) (align_labels ? align_labels : rx_align_for_label (x, 3)) Refer to GCC Internal "17.21.10 Assembler Commands for Alignment", the alignment is the value with log base 2. Therefore, align_labels = 1 --> alignment 2^1 = 2 align_labels = 4 --> alignment 2^4 = 16 align_labels = 8 --> alignment 2^8 = 256 align_labels = 16 --> alignment 2^16 = 65536 I think that is why you got those results. You can try to use align_labels_log to see if it generates the alignment results that you expect. But I am not sure if the change is correct to rx port, so I include rx maintainer, Nick Clifton, in the CC list, to see if he has any comment for your question. Best regards, jasonwucj
