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* [Bug tree-optimization/57245] New: Floating-point constant truncation ignores -frounding-math
@ 2013-05-10 20:35 jsm28 at gcc dot gnu.org
2013-05-13 8:44 ` [Bug tree-optimization/57245] " rguenth at gcc dot gnu.org
` (4 more replies)
0 siblings, 5 replies; 6+ messages in thread
From: jsm28 at gcc dot gnu.org @ 2013-05-10 20:35 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57245
Bug ID: 57245
Summary: Floating-point constant truncation ignores
-frounding-math
Product: gcc
Version: 4.9.0
Status: UNCONFIRMED
Keywords: wrong-code
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: jsm28 at gcc dot gnu.org
Blocks: 16989
When a floating-point constant is converted to a narrower floating-point type,
this conversion is meant to respect the current rounding direction, but GCC
does the conversion at compile time even with -frounding-math. Example (tested
x86_64 and ARM):
float f;
void func (void) { f = 1.3L; }
fold_convert_const_real_from_real or its caller should avoid such conversions
if -frounding-math, unless the conversion is exact.
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug tree-optimization/57245] Floating-point constant truncation ignores -frounding-math
2013-05-10 20:35 [Bug tree-optimization/57245] New: Floating-point constant truncation ignores -frounding-math jsm28 at gcc dot gnu.org
@ 2013-05-13 8:44 ` rguenth at gcc dot gnu.org
2021-10-27 12:31 ` rguenth at gcc dot gnu.org
` (3 subsequent siblings)
4 siblings, 0 replies; 6+ messages in thread
From: rguenth at gcc dot gnu.org @ 2013-05-13 8:44 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57245
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2013-05-13
Ever confirmed|0 |1
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed. Note that some callers may expect a constant result anyway
(see the TREE_OVERFLOW setting which seems to be overflow indicating...).
So fixing this may not be easy without fallout.
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug tree-optimization/57245] Floating-point constant truncation ignores -frounding-math
2013-05-10 20:35 [Bug tree-optimization/57245] New: Floating-point constant truncation ignores -frounding-math jsm28 at gcc dot gnu.org
2013-05-13 8:44 ` [Bug tree-optimization/57245] " rguenth at gcc dot gnu.org
@ 2021-10-27 12:31 ` rguenth at gcc dot gnu.org
2021-10-28 9:29 ` cvs-commit at gcc dot gnu.org
` (2 subsequent siblings)
4 siblings, 0 replies; 6+ messages in thread
From: rguenth at gcc dot gnu.org @ 2021-10-27 12:31 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=57245
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
Assignee|unassigned at gcc dot gnu.org |rguenth at gcc dot gnu.org
--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
I have a patch fixing fold_convert_const_real_from_real
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug tree-optimization/57245] Floating-point constant truncation ignores -frounding-math
2013-05-10 20:35 [Bug tree-optimization/57245] New: Floating-point constant truncation ignores -frounding-math jsm28 at gcc dot gnu.org
2013-05-13 8:44 ` [Bug tree-optimization/57245] " rguenth at gcc dot gnu.org
2021-10-27 12:31 ` rguenth at gcc dot gnu.org
@ 2021-10-28 9:29 ` cvs-commit at gcc dot gnu.org
2021-10-28 9:29 ` rguenth at gcc dot gnu.org
2021-12-27 13:40 ` hjl.tools at gmail dot com
4 siblings, 0 replies; 6+ messages in thread
From: cvs-commit at gcc dot gnu.org @ 2021-10-28 9:29 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=57245
--- Comment #5 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Richard Biener <rguenth@gcc.gnu.org>:
https://gcc.gnu.org/g:a84b9d5373c7e67fd0ab2a412c22162cdf969c91
commit r12-4764-ga84b9d5373c7e67fd0ab2a412c22162cdf969c91
Author: Richard Biener <rguenther@suse.de>
Date: Wed Oct 27 14:27:40 2021 +0200
middle-end/57245 - honor -frounding-math in real truncation
The following honors -frounding-math when converting a FP constant
to another FP type.
2021-10-27 Richard Biener <rguenther@suse.de>
PR middle-end/57245
* fold-const.c (fold_convert_const_real_from_real): Honor
-frounding-math if the conversion is not exact.
* simplify-rtx.c (simplify_const_unary_operation): Do not
simplify FLOAT_TRUNCATE with sign dependent rounding.
* gcc.dg/torture/fp-double-convert-float-1.c: New testcase.
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug tree-optimization/57245] Floating-point constant truncation ignores -frounding-math
2013-05-10 20:35 [Bug tree-optimization/57245] New: Floating-point constant truncation ignores -frounding-math jsm28 at gcc dot gnu.org
` (2 preceding siblings ...)
2021-10-28 9:29 ` cvs-commit at gcc dot gnu.org
@ 2021-10-28 9:29 ` rguenth at gcc dot gnu.org
2021-12-27 13:40 ` hjl.tools at gmail dot com
4 siblings, 0 replies; 6+ messages in thread
From: rguenth at gcc dot gnu.org @ 2021-10-28 9:29 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=57245
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
--- Comment #6 from Richard Biener <rguenth at gcc dot gnu.org> ---
This aspect is fixed. For fp<->int converts see PR84407.
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug tree-optimization/57245] Floating-point constant truncation ignores -frounding-math
2013-05-10 20:35 [Bug tree-optimization/57245] New: Floating-point constant truncation ignores -frounding-math jsm28 at gcc dot gnu.org
` (3 preceding siblings ...)
2021-10-28 9:29 ` rguenth at gcc dot gnu.org
@ 2021-12-27 13:40 ` hjl.tools at gmail dot com
4 siblings, 0 replies; 6+ messages in thread
From: hjl.tools at gmail dot com @ 2021-12-27 13:40 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=57245
Bug 57245 depends on bug 103735, which changed state.
Bug 103735 Summary: [12 Regression] Extra glibc "make check" failures by r12-4764
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103735
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |MOVED
^ permalink raw reply [flat|nested] 6+ messages in thread
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2013-05-10 20:35 [Bug tree-optimization/57245] New: Floating-point constant truncation ignores -frounding-math jsm28 at gcc dot gnu.org
2013-05-13 8:44 ` [Bug tree-optimization/57245] " rguenth at gcc dot gnu.org
2021-10-27 12:31 ` rguenth at gcc dot gnu.org
2021-10-28 9:29 ` cvs-commit at gcc dot gnu.org
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