[issue41721] xlc: add -qalias=noansi -qmaxmem=-1

2020-09-05 Thread Stefan Krah 


Change by Stefan Krah :


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resolution:  -> fixed
stage: patch review -> resolved
status: open -> closed

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[issue41721] xlc: add -qalias=noansi -qmaxmem=-1

2020-09-04 Thread Stefan Krah 


Stefan Krah  added the comment:


New changeset fb050d0d60f38dc9b6c30df1864020a92981be5b by Miss Islington (bot) 
in branch '3.9':
bpo-41721: Add xlc options (GH-22097)
https://github.com/python/cpython/commit/fb050d0d60f38dc9b6c30df1864020a92981be5b


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[issue41721] xlc: add -qalias=noansi -qmaxmem=-1

2020-09-04 Thread Stefan Krah 


Stefan Krah  added the comment:

The code example is for 64-bit Linux with sizeof(long) == sizeof(long long).

It also works on 32-bit xlc with int/long.

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[issue41721] xlc: add -qalias=noansi -qmaxmem=-1

2020-09-04 Thread miss-islington 


Change by miss-islington :


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nosy: +miss-islington
nosy_count: 2.0 -> 3.0
pull_requests: +21184
pull_request: https://github.com/python/cpython/pull/22097

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[issue41721] xlc: add -qalias=noansi -qmaxmem=-1

2020-09-04 Thread Stefan Krah 


Stefan Krah  added the comment:


New changeset 84a7917b4c9afec07575065cffa143b91fe98c14 by Stefan Krah in branch 
'master':
bpo-41721: Add xlc options (GH-22096)
https://github.com/python/cpython/commit/84a7917b4c9afec07575065cffa143b91fe98c14


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[issue41721] xlc: add -qalias=noansi -qmaxmem=-1

2020-09-04 Thread Stefan Krah 


Stefan Krah  added the comment:

-qmaxmem=-1 is added to disable verbose remarks.

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[issue41721] xlc: add -qalias=noansi -qmaxmem=-1

2020-09-04 Thread Stefan Krah 


Stefan Krah  added the comment:

We would also need -fwrapv to be safe, but I cannot find an equivalent
option for xlc.

The Intel compiler had a similar failure to #40244 that was resolved
by -fwrapv (see #40223).

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[issue41721] xlc: add -qalias=noansi -qmaxmem=-1

2020-09-04 Thread Stefan Krah 


New submission from Stefan Krah :

At least the xlc version on AIX 7.1 has aggressive optimizations even
with -O:

 
#include 
#include 


static int
f(long *a, long long *b)
{
 int t = *a;
 *b = 0;  // cannot change *a
 return *a - t;   // can be folded to zero
}

int
main(void)
{
long a = 10;

printf("%d\n", f(&a, (long long *)&a));

return 0;
}




$ xlc -O -o alias alias.c
$ ./alias
0
$ 
$ xlc -O -qalias=noansi -o alias alias.c
$ ./alias
-10

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components: +Build
type:  -> behavior
versions: +Python 3.10, Python 3.9

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[issue41721] xlc: add -qalias=noansi -qmaxmem=-1

2020-09-04 Thread Stefan Krah 


Change by Stefan Krah :


--
keywords: +patch
pull_requests: +21183
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/22096

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[issue41721] xlc: add -qalias=noansi -qmaxmem=-1

2020-09-04 Thread Stefan Krah 


Change by Stefan Krah :


--
nosy: David.Edelsohn, skrah
priority: normal
severity: normal
status: open
title: xlc: add -qalias=noansi -qmaxmem=-1

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