--- Comment #16 from patchapp at dberlin dot org 2006-09-05 01:09 ---
Subject: Bug number PR 26069
A patch for this bug has been added to the patch tracker.
The mailing list url for the patch is
http://gcc.gnu.org/ml/gcc-patches/2006-09/msg00117.html
--
--- Comment #10 from pinskia at gcc dot gnu dot org 2006-08-26 06:41
---
(In reply to comment #8)
Richard, Roger's patch for VIEW_CONVERT_EXPR folding hit mainline now.
And VCE is documented as being undefined for types of different sizes.
maybe we can produce
--- Comment #11 from pinskia at gcc dot gnu dot org 2006-08-26 14:40
---
A related testcase is:
int f(short a)
{
unsigned short b = *(unsigned short*)a;
return b;
}
Which should be optimized into --
int f1(short a)
{
unsigned short b = a;
return b;
}
--
--- Comment #12 from pinskia at gcc dot gnu dot org 2006-08-26 16:41
---
A fix for this runs into another bug which I am about to file.
--
pinskia at gcc dot gnu dot org changed:
What|Removed |Added
--- Comment #13 from pinskia at gcc dot gnu dot org 2006-08-26 16:51
---
(In reply to comment #12)
A fix for this runs into another bug which I am about to file.
I did not file it but did send an email about the problem:
http://gcc.gnu.org/ml/gcc/2006-08/msg00510.html
--
--- Comment #14 from pinskia at gcc dot gnu dot org 2006-08-26 23:04
---
And I found a fix for that so trying to work on the orginal testcase again.
--
pinskia at gcc dot gnu dot org changed:
What|Removed |Added
--- Comment #15 from pinskia at gcc dot gnu dot org 2006-08-26 23:20
---
(In reply to comment #14)
And I found a fix for that so trying to work on the orginal testcase again.
Actually I am going to submit a patch for the problem in comment #11 and then I
will fix the rest of the bug
--- Comment #9 from mmitchel at gcc dot gnu dot org 2006-05-25 02:33
---
Will not be fixed in 4.1.1; adjust target milestone to 4.1.2.
--
mmitchel at gcc dot gnu dot org changed:
What|Removed |Added
--- Comment #8 from bonzini at gnu dot org 2006-04-18 16:22 ---
Richard, Roger's patch for VIEW_CONVERT_EXPR folding hit mainline now.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=26069
--- Comment #7 from mmitchel at gcc dot gnu dot org 2006-02-24 00:26
---
This issue will not be resolved in GCC 4.1.0; retargeted at GCC 4.1.1.
--
mmitchel at gcc dot gnu dot org changed:
What|Removed |Added
--
mmitchel at gcc dot gnu dot org changed:
What|Removed |Added
Priority|P3 |P2
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=26069
--- Comment #5 from rguenth at gcc dot gnu dot org 2006-02-06 10:34 ---
*** Bug 26116 has been marked as a duplicate of this bug. ***
--
rguenth at gcc dot gnu dot org changed:
What|Removed |Added
--- Comment #6 from gianni at mariani dot ws 2006-02-06 16:52 ---
Just another data point.
I tried both the original tell_endian() and the tell_endian_good() functions on
the MS Visual Studio 2003 compiler and both generated:
?tell_endian@@YADXZ:
0: b0 01
--- Comment #4 from rguenth at gcc dot gnu dot org 2006-02-03 11:55 ---
While propagating easily works, we don't fold VIEW_CONVERT_EXPR at all. I
remember a patch of Roger which did folding of vector constants or so, but
can't find it anymore.
--
--- Comment #3 from rguenth at gcc dot gnu dot org 2006-02-02 14:56 ---
One may be able to teach forwprop about this optimization, i.e. turn
x = 1;
x.0_3 = (char *) x;
D.1522_4 = *x.0_3;
into
D.1522_4 = VIEW_CONVERT_EXPR char (x);
if that has the right semantics. CCP fold
--- Comment #2 from pinskia at gcc dot gnu dot org 2006-02-02 05:19 ---
If you used GCC's extension of using an union as not violating aliasing rules,
it works there but does not with using the portable ways:
bool tell_endian() {
unsigned x = 1;
return *(char*)x;
}
bool
16 matches
Mail list logo
