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$ X86VMS$ cc/version
VSI C x86-64 X7.4-843 (GEM 50XB9) on OpenVMS x86_64 V9.2-1
$ CC /DECC /STAND=RELAXED_ANSI /PREFIX=ALL /NAMES=AS_IS /OPTIMIZE
/NODEBUG /WARNING=(NOINFORM,DISABLE=(PREOPTW)) /FLOAT=IEEE /IEEE=DENORM
/DEFINE=(WASD_VMS_V7,SESOLA,WATCH_CAT=1,WATCH_MOD=0,WASD_ACME=1,WASD_GETSPI=1)
/OBJ=[.obj_X86_64]Error Error.c
LLVM ERROR: Cannot encode high byte register in REX-prefixed instruction