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* [Bug c/26398] New: Wrong code generated with SPE-Extensions on PowerPC
@ 2006-02-21 16:23 christian dot metzler at bmw-carit dot de
2006-02-21 16:32 ` [Bug target/26398] " pinskia at gcc dot gnu dot org
` (4 more replies)
0 siblings, 5 replies; 6+ messages in thread
From: christian dot metzler at bmw-carit dot de @ 2006-02-21 16:23 UTC (permalink / raw)
To: gcc-bugs
Hello,
I got some problems with the SPE-extensions. Quite a severe as I think.
For
float t;
char u;
t = 1.0;
u = ( ( t<0.0)?-1:((t>0.0)?1:0));
with the following compiler flags
-mcpu=8540 -meabi -mspe=yes -mabi=spe -mfloat-gprs=yes
-fsingle-precision-constant -fshort-double -mno-sdata -c -g -D__EMB_RPE__
the result for u is either -1 if t < 0.0 or 0 else. The case if t > 0.0 is
never taken. My diab shows correct results.
Generated assembler:
t = 1.0;
lis r0,0x3F80
stw r0,0x1EC(r31)
u = ( ( t<0.0)?-1:((t>0.0)?1:0));
lwz r9,0x1EC(r31)
li r0,0x0
efscmplt cr7,r9,r0
bgt cr7,0x39F04
b 0x39F10
li r0,-0x1
stb r0,0x1F1(r31)
b 0x39F28
lwz r9,0x1EC(r31)
li r0,0x0
efscmpgt cr7,r9,r0
mfcr r0
extrwi r0,r0,0x1,0x1E ; r0,r0,1,30
stb r0,0x1F1(r31)
lbz r0,0x1F1(r31)
stb r0,0x1F0(r31)
Looking in the e500-core-manual it shows that the GT-compare-result is stored
in bit 61 of CR. I suppose in this case the extrwi (or rlwinm-Instruction in
case of objdump) should check for bit 29 (=61-32), which is not the case.
Sincery yours,
Christian Metzler.
--
Summary: Wrong code generated with SPE-Extensions on PowerPC
Product: gcc
Version: 3.4.4
Status: UNCONFIRMED
Severity: critical
Priority: P3
Component: c
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: christian dot metzler at bmw-carit dot de
GCC host triplet: i686-pc-cygwin
GCC target triplet: powerpc-unknown-eabi
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=26398
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug target/26398] Wrong code generated with SPE-Extensions on PowerPC
2006-02-21 16:23 [Bug c/26398] New: Wrong code generated with SPE-Extensions on PowerPC christian dot metzler at bmw-carit dot de
@ 2006-02-21 16:32 ` pinskia at gcc dot gnu dot org
2006-02-22 5:47 ` pinskia at gcc dot gnu dot org
` (3 subsequent siblings)
4 siblings, 0 replies; 6+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2006-02-21 16:32 UTC (permalink / raw)
To: gcc-bugs
--
pinskia at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Severity|critical |normal
GCC target triplet|powerpc-unknown-eabi |powerpc-unknown-eabispe
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=26398
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug target/26398] Wrong code generated with SPE-Extensions on PowerPC
2006-02-21 16:23 [Bug c/26398] New: Wrong code generated with SPE-Extensions on PowerPC christian dot metzler at bmw-carit dot de
2006-02-21 16:32 ` [Bug target/26398] " pinskia at gcc dot gnu dot org
@ 2006-02-22 5:47 ` pinskia at gcc dot gnu dot org
2006-02-22 8:11 ` christian dot metzler at bmw-carit dot de
` (2 subsequent siblings)
4 siblings, 0 replies; 6+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2006-02-22 5:47 UTC (permalink / raw)
To: gcc-bugs
------- Comment #1 from pinskia at gcc dot gnu dot org 2006-02-22 05:47 -------
Do you have a simple example that actually compiles?
--
pinskia at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |WAITING
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=26398
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug target/26398] Wrong code generated with SPE-Extensions on PowerPC
2006-02-21 16:23 [Bug c/26398] New: Wrong code generated with SPE-Extensions on PowerPC christian dot metzler at bmw-carit dot de
2006-02-21 16:32 ` [Bug target/26398] " pinskia at gcc dot gnu dot org
2006-02-22 5:47 ` pinskia at gcc dot gnu dot org
@ 2006-02-22 8:11 ` christian dot metzler at bmw-carit dot de
2006-02-23 12:25 ` christian dot metzler at bmw-carit dot de
2006-02-27 3:42 ` pinskia at gcc dot gnu dot org
4 siblings, 0 replies; 6+ messages in thread
From: christian dot metzler at bmw-carit dot de @ 2006-02-22 8:11 UTC (permalink / raw)
To: gcc-bugs
------- Comment #2 from christian dot metzler at bmw-carit dot de 2006-02-22 08:11 -------
Simple test case:
int main(int argc, char **argv) {
float t;
char u;
t = 1.0;
u = ( ( t<0.0)?-1:((t>0.0)?1:0));
return (int)u;
}
Compiles e.g. on i386 and returns 1. Compiled with given C-Flags and executed
on a MPC5553 it stores 0 in u. Debugged with a Lauterbach Debugger over JTAG.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=26398
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug target/26398] Wrong code generated with SPE-Extensions on PowerPC
2006-02-21 16:23 [Bug c/26398] New: Wrong code generated with SPE-Extensions on PowerPC christian dot metzler at bmw-carit dot de
` (2 preceding siblings ...)
2006-02-22 8:11 ` christian dot metzler at bmw-carit dot de
@ 2006-02-23 12:25 ` christian dot metzler at bmw-carit dot de
2006-02-27 3:42 ` pinskia at gcc dot gnu dot org
4 siblings, 0 replies; 6+ messages in thread
From: christian dot metzler at bmw-carit dot de @ 2006-02-23 12:25 UTC (permalink / raw)
To: gcc-bugs
------- Comment #3 from christian dot metzler at bmw-carit dot de 2006-02-23 12:25 -------
Seems to be fixed in 4.0.2
--
christian dot metzler at bmw-carit dot de changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|WAITING |RESOLVED
Resolution| |FIXED
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=26398
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug target/26398] Wrong code generated with SPE-Extensions on PowerPC
2006-02-21 16:23 [Bug c/26398] New: Wrong code generated with SPE-Extensions on PowerPC christian dot metzler at bmw-carit dot de
` (3 preceding siblings ...)
2006-02-23 12:25 ` christian dot metzler at bmw-carit dot de
@ 2006-02-27 3:42 ` pinskia at gcc dot gnu dot org
4 siblings, 0 replies; 6+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2006-02-27 3:42 UTC (permalink / raw)
To: gcc-bugs
--
pinskia at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|--- |4.0.2
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=26398
^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2006-02-27 3:42 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
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2006-02-21 16:23 [Bug c/26398] New: Wrong code generated with SPE-Extensions on PowerPC christian dot metzler at bmw-carit dot de
2006-02-21 16:32 ` [Bug target/26398] " pinskia at gcc dot gnu dot org
2006-02-22 5:47 ` pinskia at gcc dot gnu dot org
2006-02-22 8:11 ` christian dot metzler at bmw-carit dot de
2006-02-23 12:25 ` christian dot metzler at bmw-carit dot de
2006-02-27 3:42 ` pinskia at gcc dot gnu dot org
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