Hi Joe,
You are forgetting that '=H' creates a storage area of a half-byte,
which is addressed by the RX Instruction.
Here is what happens:
Active Usings: None
Loc Object Code Addr1 Addr2 Stmt Source
Statement HLASM R6.0 2021/10/23 20.37
000000 00000 0000A 1 TEST CSECT
R:F 00000 2 USING *,15
000000 4820 F008 00008 3 LH 2,=H'-5'
4 END
000008 FFFB 5 =H'-5'
Regards,
David
On 2021-10-23 20:18, Joe Monk wrote:
OK then explain this:
LH is an RX format instruction. What are the D, X and B values if the
second operand is simply =H'-5'?
Joe
On Sat, Oct 23, 2021 at 6:49 PM Paul Gilmartin <
[email protected]> wrote:
On Sat, 23 Oct 2021 18:36:54 -0500, Joe Monk wrote:
LH is an RX instruction.
So, LH 3,=H'-5' would give an addressing exception, no? Because the second
operand is treated as coming from storage? So that would be a negative
address?
No.
If you said LH 3,0(=H'-5',2), that would give you ITEM+5?
You have a bad use-versus-mention conflation. The value of an
object is not the address of that object.
<https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fen.wikipedia.org%2Fwiki%2FUse%25E2%2580%2593mention_distinction&data=04%7C01%7C%7C5e84fc92bdc04108c95108d99683ec8e%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637706315699635719%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=vdAJBoVajwyo3xC%2FjxfrXB94px9%2FVKJNgGIexK%2Fc2WA%3D&reserved=0>
On Sat, Oct 23, 2021 at 6:01 PM Bernd Oppolzer wrote:
LA 2,ITEM+10
LH 3,=H'-5'
LA 2,0(2,3)
will put the address ITEM+5 in register 2, at least in AMODE 24/31?
I agree.
-- gil
----------------------------------------------------------------------
For IBM-MAIN subscribe / signoff / archive access instructions,
send email to [email protected] with the message: INFO IBM-MAIN
----------------------------------------------------------------------
For IBM-MAIN subscribe / signoff / archive access instructions,
send email to [email protected] with the message: INFO IBM-MAIN
.
----------------------------------------------------------------------
For IBM-MAIN subscribe / signoff / archive access instructions,
send email to [email protected] with the message: INFO IBM-MAIN
