Hi Bernd
We had several PMR's about the C++ compiler and the compiler team
reacted always
very fast and competently (maybe as they are in Canada ;-) )
On 5/19/2010 9:21 AM, Bernd Oppolzer wrote:
Hello David,
which version of the compiler did generate the MVC instructions?
was this with or without the INITAUTO option?
We use the z/OS v1.6 version, and this version only generates the MVI,
not the MVCs.
We will not use INITAUTO due to serious performance degradation.
At the moment, management discusses the strategy to follow:
a) opening a PMR with IBM, and, if IBM agrees and changes their
compilers,
recompiling all our C programs
b) accepting the behaviour of the IBM C compilers and examining
all our sources, changing all partial structure initializations to
memset and, again,
recompiling all our C programs
Kind regards
Bernd
David Crayford schrieb:
Are you sure there isn't an MVC after the MVI?
I rely on that kind of initialization all the time and have never had
a problem. A quick test program shows the correct behavior.
If this is not working as the ANSI standard I suggest you open a PMR.
To circumvent the problem compile with INITAUTO(0).
* *
struct F *
{ * int
a; * char
string[20]; * short
s; *
};
* * struct F f =
{0}; LA r0,0
ST r0,f.F.a(,r4,2016) MVI
f(r4,2020),0 MVC f(23,r4,2021),f(r4,2020)
Compiled with CHECKOUT compiler option generates the following message.
INFORMATIONAL CCN3447 DOC.C(F1):14 The member(s) starting from
"string" will be initialized with a default value of 0.
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