Bug 1698 - [MIPS] compiling optimized code using mips4 on R12000
Summary: [MIPS] compiling optimized code using mips4 on R12000
Status: RESOLVED INVALID
Alias: None
Product: gcc
Classification: Unclassified
Component: target (show other bugs)
Version: unknown
: P3 normal
Target Milestone: ---
Assignee: Eric Christopher
URL:
Keywords: wrong-code
Depends on:
Blocks:
 
Reported: 2001-01-18 15:36 UTC by mburnham
Modified: 2003-08-17 02:10 UTC (History)
2 users (show)

See Also:
Host: mips-sgi-irix6.5
Target: mips-sgi-irix6.5
Build: mips-sgi-irix6.5
Known to work:
Known to fail:
Last reconfirmed:

Attachments
test_loops.cxx (318 bytes, text/x-c )
2003-05-21 15:17 UTC, mburnham 		Details
View All Add an attachment (proposed patch, testcase, etc.)

Note You need to log in before you can comment on or make changes to this bug.
Description mburnham 2001-01-18 15:36:01 UTC 
Sample program is compiled with the -mips4 and -O2 flags.
When it is run, the condition of a while loop that tests 
an int against a double fails, but shouldn't.

The problem is only on machines with R12000 processors.
It works ok on a machine with R10000 processors.

Release:
unknown

Environment:
SGI Onyx, IRIX64 6.5, with IP27 Processors
CPU: MIPS R12000 Processor Chip Revision: 3.5
FPU: MIPS R12010 Floating Point Chip Revision: 0.0

How-To-Repeat:
1 - compile using:
    g++ -mips4 -O2 test_loops.cxx -o test_loops
2 - execute test_loops application
Comment 1 mburnham 2001-01-18 15:36:01 UTC 
Fix:
compile using the -mips3 flag
Comment 2 Richard Henderson 2002-04-03 17:04:46 UTC 
Responsible-Changed-From-To: unassigned->echristo
Responsible-Changed-Why: mips
Comment 3 Eric Christopher 2003-05-17 06:51:24 UTC 
State-Changed-From-To: open->feedback
State-Changed-Why: Can you retest this with mainline. I don't have an r12000 machine and the code appears correct (and runs on an r10000 as you noticed).
Comment 4 Dara Hazeghi 2003-06-21 00:16:02 UTC 
Just a reminder that this bug is waiting for feedback. Does the code still have problems, using gcc 
3.3? Thanks,

Dara
Comment 5 Andrew Pinski 2003-08-17 02:10:13 UTC 
No feedback in 3 months.