When you code an immediate operand, it has semantics beyond the generated code. An operand of -1 is signed and not equivalent to X'FFFF', even though they have the same value. The instruction is compare logical half half storage immediate, thus the assembler expects the immediate operand to be unsigned. I'd consider the message to be appropriate.
Maybe define a symbol with an appropriate and use it in the CLHHSI, e.g., HWMINUS1ASUNSIGNED EQU X'FFFF' -- Shmuel (Seymour J.) Metz http://mason.gmu.edu/~smetz3 ________________________________________ From: IBM Mainframe Assembler List [[email protected]] on behalf of Ed Jaffe [[email protected]] Sent: Wednesday, December 7, 2022 10:46 AM To: [email protected] Subject: CLHHSI TYPECHECK(MAGNITUDE) Annoyance We decided to replace many SS instructions with their SIL counterparts. One common case is frustrating. D501 C01E C020 CLC HWord,=H'-1' Is it negative one? A784 000C JE NegOne Branch if yes replaced with: E555 C01E FFFF CLHHSI HWord,-1 Is it negative one? A784 000C JE NegOne Branch if yes ** ASMA320W Immediate field operand may have incorrect sign or magnitude - -1 I totally understand the warning in this case: E555 C01E FFFF CLHHSI HWord,131071 Is it negative one? A784 000C JE NegOne Branch if yes ** ASMA320W Immediate field operand may have incorrect sign or magnitude - 131071 but I can't understand why -1 generates this warning. The provided value is validly within the range -32768 through 32767. We like TYPECHECK(MAGNITUDE) and quite literally assemble tens of millions of lines of code daily with it enabled and no such warnings are produced. So we're forced to use ACONTROL like this around this bizarre case: PUSH ACONTROL ACONTROL TYPECHECK(NOMAGNITUDE) E555 C01E FFFF CLHHSI HWord,-1 Is it negative one? A784 000C JE NegOne Branch if yes POP ACONTROL It seems a ridiculous misunderstanding on the part of the assembler... -- Phoenix Software International Edward E. Jaffe 831 Parkview Drive North El Segundo, CA 90245 https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.phoenixsoftware.com%2F&data=05%7C01%7Csmetz3%40gmu.edu%7Cb8e9bc93878545f5d50608dad86a6896%7C9e857255df574c47a0c00546460380cb%7C0%7C0%7C638060248795037186%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=nSiNwQLluMEbqXVV7FtvNW%2BoB3oVZmxt%2BQcNN%2Fmlc7k%3D&reserved=0 -------------------------------------------------------------------------------- This e-mail message, including any attachments, appended messages and the information contained therein, is for the sole use of the intended recipient(s). If you are not an intended recipient or have otherwise received this email message in error, any use, dissemination, distribution, review, storage or copying of this e-mail message and the information contained therein is strictly prohibited. If you are not an intended recipient, please contact the sender by reply e-mail and destroy all copies of this email message and do not otherwise utilize or retain this email message or any or all of the information contained therein. Although this email message and any attachments or appended messages are believed to be free of any virus or other defect that might affect any computer system into which it is received and opened, it is the responsibility of the recipient to ensure that it is virus free and no responsibility is accepted by the sender for any loss or damage arising in any way from its opening or use.
