Re: Miscompilation (gcc + inline asmb)
On 15/08/2021 18:34, BERTRAND Joël wrote: > I remember I have used uECC a long time ago without this kind of bug. I > have rebuilt the same code (with uECC_avr defined), but I have compiled > this library not with gcc 11.1.0, but with 5.4.0. Just curious - what is the difference in the assembler output in each case? -Ian
Re: Miscompilation (gcc + inline asmb)
Some news. I remember I have used uECC a long time ago without this kind of bug. I have rebuilt the same code (with uECC_avr defined), but I have compiled this library not with gcc 11.1.0, but with 5.4.0. And I obtain : simavr -t -m atmega1284 -f 1600 test2.elf Loaded 18710 .text at address 0x0 Loaded 416 .data Init... Init alea... Init random_ecc... 93A980352F127448C19FB0213622B13D5FEFC07CA4E6EA3A22234E7F0D9634FF8F2854B25A6E70F9E2063AB47040A341B54D39FD4845FB6D86CA33C8CFB5E308... 93A980352F127448C19FB0213622B13D5FEFC07CA4E6EA3A22234E7F0D9634FF8F2854B25A6E70F9E2063AB47040A341B54D39FD4845FB6D86CA33C8CFB5E308... Done... Now the question ;-) Did I find a bug or does gcc 11 need a special build option to compile uECC ? Best regards, JB
Re: Miscompilation (gcc + inline asmb)
Some news. I remember I have used uECC a long time ago without this kind of bug. I have rebuilt the same code (with uECC_avr defined), but I have compiled this library not with gcc 11.1.0, but with 5.4.0. And I obtain : simavr -t -m atmega1284 -f 1600 test2.elf Loaded 18710 .text at address 0x0 Loaded 416 .data Init... Init alea... Init random_ecc... 93A980352F127448C19FB0213622B13D5FEFC07CA4E6EA3A22234E7F0D9634FF8F2854B25A6E70F9E2063AB47040A341B54D39FD4845FB6D86CA33C8CFB5E308... 93A980352F127448C19FB0213622B13D5FEFC07CA4E6EA3A22234E7F0D9634FF8F2854B25A6E70F9E2063AB47040A341B54D39FD4845FB6D86CA33C8CFB5E308... Done... Now the question ;-) Did I find a bug or does gcc 11 need a special build option to compile uECC ? Best regards, JB
Re: Miscompilation (gcc + inline asmb)
Some news. I have uploaded a simple example at https://hilbert.systella.fr/public/test_uecc.tar.gz This tarball contains minimal code to trigger this issue, makefile and two asmb output : - ok.asm - ko.asm ok.asm runs as expected and was built with #define uECC_PLATFORM uECC_arch_other in uECC.h. ko.asm doesn't run as expected and was built with #define uECC_PLATFORM uECC_avr Help will be welcome... Best regards, JB
