Re: [CAUTION - External Sender] Re: gcc relies on RISC-V vcompress instruction undefined behaviour

Hi Richard, > Please file a bugreport so this issue doesn't get lost. I was struggling to reproduce it on a recent toolchain, but I managed to take one of the gcc test cases and recreate it I think. I submitted https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117383 Thanks, Anton

gcc relies on RISC-V vcompress instruction undefined behaviour

Hi, I think gcc is relying on undefined behaviour with the vcompress instruction. Unfortunately my test case isn't reproducing on mainline, but gcc looks to use the fields between the last mask selected field and vl while setting tail agnostic. This thread explains how vcompress is different in t