The contents of a storage location is a bunch of bits. Signed or not is
an interpretation of the instruction accessing the location. LH will
sign-expand a halfword, so it was treated as signed; LLH does not sign
extend, so the same bunch of bits are now taken as unsigned.
I don't wish to be labeled as a troll, but it seems to me that you have
got the architecture topsy-turvy.
On 03/29/2016 12:18 AM, Ngan, Robert wrote:
For non-relocatable values, the range of Y values is the same as a signed
halfword.
In my case, I want unsigned values so I can't use Y.
I ended up coding:
DC AL2(expr)
DS 0XL(65536-expr) ASSERT: expr was not truncated
-----Original Message-----
From: IBM Mainframe Assembler List [mailto:[email protected]] On
Behalf Of Robert Netzlof
Sent: Saturday, March 26, 2016 11:59
To: [email protected]
Subject: Re: Generating warning for AL2 expression truncation?
On 3/26/16, Steve Smith <[email protected]> wrote:
Well, it seems to me that the lack of any message on the AL2 is a bug.
Correct me if I'm wrong, but I think Y-cons are signed...
H type constants, yes.
Y type constants, no.
They are address constants, addresses cannot be negative.
They date from the dawn of time, when there were 32K and smaller 360's abroad
in the land.
--
Bob Netzlof a/k/a Sweet Old Bob
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