KJ16609/gcc
1
0
Fork 0
mirror of https://gcc.gnu.org/git/gcc.git synced 2026-02-22 03:46:53 -05:00
Code Issues Packages Projects Releases Wiki Activity

backport: re PR middle-end/21032 (With -frounding-math, incorrectly reorders unary minus)

Browse Source 
2006-11-13  Richard Guenther  <rguenther@suse.de>

        Backport from mainline:
        2006-10-23  Richard Guenther  <rguenther@suse.de>

        PR middle-end/21032
        * convert.c (convert_to_real): Fold (float)-x to -(float)x
        only if not flag_rounding_math.

        * gcc.dg/pr21032.c: New testcase.

From-SVN: r118751
This commit is contained in:
Richard Guenther
2006-11-13 10:15:26 +00:00
committed by Richard Biener
parent 4f67e1c6ab
commit 4063073db5
4 changed files with 32 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

9
gcc/ChangeLog
View File

@@ -1,3 +1,12 @@
2006-11-13 Richard Guenther <rguenther@suse.de>
Backport from mainline:
2006-10-23 Richard Guenther <rguenther@suse.de>
PR middle-end/21032
* convert.c (convert_to_real): Fold (float)-x to -(float)x
only if not flag_rounding_math.
2006-11-12 Jason Merrill <jason@redhat.com>
Andrew Pinski <pinskia@physics.uc.edu>

6
gcc/convert.c
View File

@@ -248,10 +248,12 @@ convert_to_real (tree type, tree expr)
if (itype != type && FLOAT_TYPE_P (type))
switch (TREE_CODE (expr))
{
/* Convert (float)-x into -(float)x. This is always safe. */
/* Convert (float)-x into -(float)x. This is safe for
round-to-nearest rounding mode. */
case ABS_EXPR:
case NEGATE_EXPR:
if (TYPE_PRECISION (type) < TYPE_PRECISION (TREE_TYPE (expr)))
if (!flag_rounding_math
&& TYPE_PRECISION (type) < TYPE_PRECISION (TREE_TYPE (expr)))
return build1 (TREE_CODE (expr), type,
fold (convert_to_real (type,
TREE_OPERAND (expr, 0))));

8
gcc/testsuite/ChangeLog
View File

@@ -1,3 +1,11 @@
2006-11-13 Richard Guenther <rguenther@suse.de>
Backport form mainline:
2006-10-23 Richard Guenther <rguenther@suse.de>
PR middle-end/21032
* gcc.dg/pr21032.c: New testcase.
2006-11-12 Paul Thomas <pault@gcc.gnu.org>
PR fortran/29699

11
gcc/testsuite/gcc.dg/pr21032.c Normal file
View File

@@ -0,0 +1,11 @@
/* { dg-do compile } */
/* { dg-options "-O -fdump-tree-optimized -frounding-math" } */
void bar(float x);
void foo(double x)
{
bar(-x);
}
/* { dg-final { scan-tree-dump-not "-\\(float\\)" "optimized" } } */
/* { dg-final { cleanup-tree-dump "optimized" } } */