On 06/30/2017 08:39 AM, Pranith Kumar wrote:
Clang generates the following warning on aarch64 host:CC util/cacheinfo.o /home/pranith/qemu/util/cacheinfo.c:121:48: warning: value size does not match register size specified by the constraint and modifier [-Wasm-operand-widths] asm volatile("mrs\t%0, ctr_el0" : "=r"(ctr)); ^ /home/pranith/qemu/util/cacheinfo.c:121:28: note: use constraint modifier "w" asm volatile("mrs\t%0, ctr_el0" : "=r"(ctr)); ^~ %w0
That is an absolutely stupid warning. There's long precedent for the compiler choosing the prefix for you based on the type of the argument.
Constraint modifier 'w' is not (yet?) accepted by gcc. Fix this by increasing the ctr size.
Certainly it is -- since the beginning of time. r~
