On 07/06/2021 01.39, Rasmus Villemoes wrote: > memory". Replacing with a call to an extern function marked pure does > indeed cause gcc to cache the value of y*z, so in theory this should be > possible, if one could convince gcc to "trust me, this really is a pure > function". Don't know why I didn't think to check before sending, but FWIW clang doesn't need convincing, it already takes the __pure at face value and caches y*z. Rasmus
