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* Re: optimization/4280: Misplaced warnings with optimized `foo / 0.0'
@ 2002-04-02 23:37 rth
0 siblings, 0 replies; 2+ messages in thread
From: rth @ 2002-04-02 23:37 UTC (permalink / raw)
To: gcc-bugs, gcc-prs, h.b.furuseth, nobody
Synopsis: Misplaced warnings with optimized `foo / 0.0'
State-Changed-From-To: open->analyzed
State-Changed-By: rth
State-Changed-When: Tue Apr 2 23:37:20 2002
State-Changed-Why:
Misplaced warnings produced under simplify_binary_real during
cse_insn. We don't have a way to pass down some notion of the
current insn being considered here, so no way to get hold of
the proper line number.
http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=4280
^ permalink raw reply [flat|nested] 2+ messages in thread
* optimization/4280: Misplaced warnings with optimized `foo / 0.0'
@ 2001-09-09 17:16 Hallvard B Furuseth
0 siblings, 0 replies; 2+ messages in thread
From: Hallvard B Furuseth @ 2001-09-09 17:16 UTC (permalink / raw)
To: gcc-gnats
>Number: 4280
>Category: optimization
>Synopsis: Misplaced warnings with optimized `foo / 0.0'
>Confidential: no
>Severity: non-critical
>Priority: low
>Responsible: unassigned
>State: open
>Class: sw-bug
>Submitter-Id: net
>Arrival-Date: Sun Sep 09 17:16:00 PDT 2001
>Closed-Date:
>Last-Modified:
>Originator: Hallvard B Furuseth
>Release: 3.0.1
>Organization:
University of Oslo
>Environment:
System: SunOS bombur.uio.no 5.8 Generic_108528-03 sun4u sparc SUNW,Ultra-5_10
Architecture: sun4
host: sparc-sun-solaris2.8
build: sparc-sun-solaris2.8
target: sparc-sun-solaris2.8
configured with: ../gcc-3.0.1/configure --prefix=/usit/bombur/hbf --program-suffix=3 --enable-version-specific-runtime-libs --enable-languages=c --quiet
>Description:
Warnings `division: NaN - producing operation'
and `division: function singularity' form optimized code
get the wrong line numbers. (The line of the closing
brace of the end of the function.)
`gcc -W' produces some correctly placed warnings.
`gcc -W -O' produces some additional misplaced warnings.
The warnings which `gcc -W' also produced, are not misplaced.
>How-To-Repeat:
$ cat a.c
double a, b, c, d, e, f;
void y()
{
double zero = 0.0;
/* Misplaced warnings: */
a = zero / zero; /* "line 15" NaN */
b = 0.0 / zero; /* "line 15" NaN */
c = zero / 0.0; /* "line 15" NaN */
d = 1.0 / zero; /* "line 15" singularity */
/* Correctly placed warnings: */
e = 0.0 / 0.0; /* line 13 NaN */
f = 1.0 / 0.0; /* line 14 singularity */
} /* line 15 */
/* Correctly placed warnings: */
double g = 0.0 / 0.0; /* line 18 NaN */
double h = 1.0 / 0.0; /* line 19 singularity */
$ gcc3 -W -S a.c
a.c: In function `y':
a.c:13: warning: division: NaN - producing operation
a.c:14: warning: division: function singularity
a.c: At top level:
a.c:18: warning: division: NaN - producing operation
a.c:19: warning: division: function singularity
$ gcc3 -W -O -S a.c
a.c: In function `y':
a.c:13: warning: division: NaN - producing operation
a.c:14: warning: division: function singularity
a.c:15: warning: division: NaN - producing operation
a.c:15: warning: division: NaN - producing operation
a.c:15: warning: division: NaN - producing operation
a.c:15: warning: division: function singularity
a.c: At top level:
a.c:18: warning: division: NaN - producing operation
a.c:19: warning: division: function singularity
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:
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2002-04-02 23:37 optimization/4280: Misplaced warnings with optimized `foo / 0.0' rth
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2001-09-09 17:16 Hallvard B Furuseth
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