* [Bug other/63395] Cygwin vs Cygwin64 Floating Point Discrepancy
[not found] <bug-63395-4@http.gcc.gnu.org/bugzilla/>
@ 2014-09-27 20:59 ` bernardwidynski at gmail dot com
2014-09-27 21:00 ` bernardwidynski at gmail dot com
` (10 subsequent siblings)
11 siblings, 0 replies; 12+ messages in thread
From: bernardwidynski at gmail dot com @ 2014-09-27 20:59 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63395
--- Comment #1 from bernardwidynski at gmail dot com ---
Created attachment 33591
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=33591&action=edit
Cygwin output file
^ permalink raw reply [flat|nested] 12+ messages in thread* [Bug other/63395] Cygwin vs Cygwin64 Floating Point Discrepancy
[not found] <bug-63395-4@http.gcc.gnu.org/bugzilla/>
2014-09-27 20:59 ` [Bug other/63395] Cygwin vs Cygwin64 Floating Point Discrepancy bernardwidynski at gmail dot com
@ 2014-09-27 21:00 ` bernardwidynski at gmail dot com
2014-09-27 21:00 ` bernardwidynski at gmail dot com
` (9 subsequent siblings)
11 siblings, 0 replies; 12+ messages in thread
From: bernardwidynski at gmail dot com @ 2014-09-27 21:00 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63395
--- Comment #3 from bernardwidynski at gmail dot com ---
Created attachment 33593
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=33593&action=edit
Cywin .i file
^ permalink raw reply [flat|nested] 12+ messages in thread* [Bug other/63395] Cygwin vs Cygwin64 Floating Point Discrepancy
[not found] <bug-63395-4@http.gcc.gnu.org/bugzilla/>
2014-09-27 20:59 ` [Bug other/63395] Cygwin vs Cygwin64 Floating Point Discrepancy bernardwidynski at gmail dot com
2014-09-27 21:00 ` bernardwidynski at gmail dot com
@ 2014-09-27 21:00 ` bernardwidynski at gmail dot com
2014-09-27 21:01 ` bernardwidynski at gmail dot com
` (8 subsequent siblings)
11 siblings, 0 replies; 12+ messages in thread
From: bernardwidynski at gmail dot com @ 2014-09-27 21:00 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63395
--- Comment #2 from bernardwidynski at gmail dot com ---
Created attachment 33592
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=33592&action=edit
Cygwin64 output file
^ permalink raw reply [flat|nested] 12+ messages in thread* [Bug other/63395] Cygwin vs Cygwin64 Floating Point Discrepancy
[not found] <bug-63395-4@http.gcc.gnu.org/bugzilla/>
` (2 preceding siblings ...)
2014-09-27 21:00 ` bernardwidynski at gmail dot com
@ 2014-09-27 21:01 ` bernardwidynski at gmail dot com
2014-09-27 21:01 ` bernardwidynski at gmail dot com
` (7 subsequent siblings)
11 siblings, 0 replies; 12+ messages in thread
From: bernardwidynski at gmail dot com @ 2014-09-27 21:01 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63395
--- Comment #4 from bernardwidynski at gmail dot com ---
Created attachment 33594
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=33594&action=edit
Cygwin64 .i file
^ permalink raw reply [flat|nested] 12+ messages in thread* [Bug other/63395] Cygwin vs Cygwin64 Floating Point Discrepancy
[not found] <bug-63395-4@http.gcc.gnu.org/bugzilla/>
` (3 preceding siblings ...)
2014-09-27 21:01 ` bernardwidynski at gmail dot com
@ 2014-09-27 21:01 ` bernardwidynski at gmail dot com
2014-09-27 21:02 ` bernardwidynski at gmail dot com
` (6 subsequent siblings)
11 siblings, 0 replies; 12+ messages in thread
From: bernardwidynski at gmail dot com @ 2014-09-27 21:01 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63395
--- Comment #5 from bernardwidynski at gmail dot com ---
Created attachment 33595
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=33595&action=edit
makefile
^ permalink raw reply [flat|nested] 12+ messages in thread* [Bug other/63395] Cygwin vs Cygwin64 Floating Point Discrepancy
[not found] <bug-63395-4@http.gcc.gnu.org/bugzilla/>
` (4 preceding siblings ...)
2014-09-27 21:01 ` bernardwidynski at gmail dot com
@ 2014-09-27 21:02 ` bernardwidynski at gmail dot com
2014-09-27 21:03 ` bernardwidynski at gmail dot com
` (5 subsequent siblings)
11 siblings, 0 replies; 12+ messages in thread
From: bernardwidynski at gmail dot com @ 2014-09-27 21:02 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63395
--- Comment #6 from bernardwidynski at gmail dot com ---
Created attachment 33596
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=33596&action=edit
Cygwin make output
^ permalink raw reply [flat|nested] 12+ messages in thread* [Bug other/63395] Cygwin vs Cygwin64 Floating Point Discrepancy
[not found] <bug-63395-4@http.gcc.gnu.org/bugzilla/>
` (5 preceding siblings ...)
2014-09-27 21:02 ` bernardwidynski at gmail dot com
@ 2014-09-27 21:03 ` bernardwidynski at gmail dot com
2014-09-27 21:03 ` bernardwidynski at gmail dot com
` (4 subsequent siblings)
11 siblings, 0 replies; 12+ messages in thread
From: bernardwidynski at gmail dot com @ 2014-09-27 21:03 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63395
--- Comment #8 from bernardwidynski at gmail dot com ---
Created attachment 33598
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=33598&action=edit
Cygwin cygcheck output
^ permalink raw reply [flat|nested] 12+ messages in thread* [Bug other/63395] Cygwin vs Cygwin64 Floating Point Discrepancy
[not found] <bug-63395-4@http.gcc.gnu.org/bugzilla/>
` (6 preceding siblings ...)
2014-09-27 21:03 ` bernardwidynski at gmail dot com
@ 2014-09-27 21:03 ` bernardwidynski at gmail dot com
2014-09-27 21:04 ` bernardwidynski at gmail dot com
` (3 subsequent siblings)
11 siblings, 0 replies; 12+ messages in thread
From: bernardwidynski at gmail dot com @ 2014-09-27 21:03 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63395
--- Comment #7 from bernardwidynski at gmail dot com ---
Created attachment 33597
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=33597&action=edit
Cygwin64 make output
^ permalink raw reply [flat|nested] 12+ messages in thread* [Bug other/63395] Cygwin vs Cygwin64 Floating Point Discrepancy
[not found] <bug-63395-4@http.gcc.gnu.org/bugzilla/>
` (7 preceding siblings ...)
2014-09-27 21:03 ` bernardwidynski at gmail dot com
@ 2014-09-27 21:04 ` bernardwidynski at gmail dot com
2014-09-27 23:09 ` mikpelinux at gmail dot com
` (2 subsequent siblings)
11 siblings, 0 replies; 12+ messages in thread
From: bernardwidynski at gmail dot com @ 2014-09-27 21:04 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63395
--- Comment #9 from bernardwidynski at gmail dot com ---
Created attachment 33599
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=33599&action=edit
Cygwin64 cygcheck output
^ permalink raw reply [flat|nested] 12+ messages in thread* [Bug other/63395] Cygwin vs Cygwin64 Floating Point Discrepancy
[not found] <bug-63395-4@http.gcc.gnu.org/bugzilla/>
` (8 preceding siblings ...)
2014-09-27 21:04 ` bernardwidynski at gmail dot com
@ 2014-09-27 23:09 ` mikpelinux at gmail dot com
2014-09-28 19:37 ` bernardwidynski at gmail dot com
2014-09-29 10:56 ` rguenth at gcc dot gnu.org
11 siblings, 0 replies; 12+ messages in thread
From: mikpelinux at gmail dot com @ 2014-09-27 23:09 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63395
--- Comment #10 from Mikael Pettersson <mikpelinux at gmail dot com> ---
I strongly suspect 32-bit Cygwin uses x87 by default, while 64-bit Cygwin
probably uses SSE2 by default. These two FP implementations are very
different, and it's not at all surprising to see different results from them.
Try compiling with -mpc64 on 32-bit Cygwin.
^ permalink raw reply [flat|nested] 12+ messages in thread* [Bug other/63395] Cygwin vs Cygwin64 Floating Point Discrepancy
[not found] <bug-63395-4@http.gcc.gnu.org/bugzilla/>
` (9 preceding siblings ...)
2014-09-27 23:09 ` mikpelinux at gmail dot com
@ 2014-09-28 19:37 ` bernardwidynski at gmail dot com
2014-09-29 10:56 ` rguenth at gcc dot gnu.org
11 siblings, 0 replies; 12+ messages in thread
From: bernardwidynski at gmail dot com @ 2014-09-28 19:37 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63395
--- Comment #11 from bernardwidynski at gmail dot com ---
Thanks for the information.
I looked at the .s assembly files.
32-bit Cygwin uses the "fmul" instruction.
64-bit Cygwin uses the "mulsd" instruction.
I tried -mpc64 on 32-bit Cygwin but got the same results.
On Sat, Sep 27, 2014 at 4:09 PM, mikpelinux at gmail dot com <
gcc-bugzilla@gcc.gnu.org> wrote:
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63395
>
> --- Comment #10 from Mikael Pettersson <mikpelinux at gmail dot com> ---
> I strongly suspect 32-bit Cygwin uses x87 by default, while 64-bit Cygwin
> probably uses SSE2 by default. These two FP implementations are very
> different, and it's not at all surprising to see different results from
> them.
>
> Try compiling with -mpc64 on 32-bit Cygwin.
>
> --
> You are receiving this mail because:
> You reported the bug.
>
^ permalink raw reply [flat|nested] 12+ messages in thread* [Bug other/63395] Cygwin vs Cygwin64 Floating Point Discrepancy
[not found] <bug-63395-4@http.gcc.gnu.org/bugzilla/>
` (10 preceding siblings ...)
2014-09-28 19:37 ` bernardwidynski at gmail dot com
@ 2014-09-29 10:56 ` rguenth at gcc dot gnu.org
11 siblings, 0 replies; 12+ messages in thread
From: rguenth at gcc dot gnu.org @ 2014-09-29 10:56 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63395
--- Comment #12 from Richard Biener <rguenth at gcc dot gnu.org> ---
You can also try -fexcess-precision=standard on Cygwin, -mpc64 might not be
implemented there.
^ permalink raw reply [flat|nested] 12+ messages in thread