The low word's opcode replaced, the half above bit 32 cleared.
1387def sm121LowerRegisterForm =
1388 (lambda unrestricted low : Nat .
1389 (lambda unrestricted opcode : Nat .
1390 (sm121LowerWithField (nat-modulo low sm121LowerHalfWordSpan) 1 sm121LowerOpcodeSpan opcode)))The compiler supplied declaration spans and resolved links from this source snapshot. This page does not assert that this file belongs to a checked closure.