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* [Bug c++/19044] New: Alternate asm name for atan ignored when calling __builtin_atan
@ 2004-12-16 21:15 austern at apple dot com
2004-12-16 23:35 ` [Bug c++/19044] " pinskia at gcc dot gnu dot org
` (4 more replies)
0 siblings, 5 replies; 6+ messages in thread
From: austern at apple dot com @ 2004-12-16 21:15 UTC (permalink / raw)
To: gcc-bugs
For atan (and other functions like it), calling __builtin_atan is sometimes supposed to fall back to the
library version of atan. In the C++ front end, this interacts poorly with alternate asm names.
Consider the following test case:
#ifdef __cplusplus
extern "C"
#endif
double atan(double x) __asm("_fancy_atan");
double foo(double x) { return __builtin_atan(x); }
When it's compiled as C, it gives the behavior I expect: foo calls _fancy_atan. The C++ front end,
however, gets it wrong: we call _atan, ignoring the fact that this function is supposed to have a different
assembler name.
--
Summary: Alternate asm name for atan ignored when calling
__builtin_atan
Product: gcc
Version: 4.0.0
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: c++
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: austern at apple dot com
CC: gcc-bugs at gcc dot gnu dot org
GCC build triplet: powerpc-apple-darwin7.6.0
GCC host triplet: powerpc-apple-darwin7.6.0
GCC target triplet: powerpc-apple-darwin7.6.0
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19044
^ permalink raw reply [flat|nested] 6+ messages in thread* [Bug c++/19044] Alternate asm name for atan ignored when calling __builtin_atan 2004-12-16 21:15 [Bug c++/19044] New: Alternate asm name for atan ignored when calling __builtin_atan austern at apple dot com @ 2004-12-16 23:35 ` pinskia at gcc dot gnu dot org 2004-12-18 1:17 ` austern at apple dot com ` (3 subsequent siblings) 4 siblings, 0 replies; 6+ messages in thread From: pinskia at gcc dot gnu dot org @ 2004-12-16 23:35 UTC (permalink / raw) To: gcc-bugs ------- Additional Comments From pinskia at gcc dot gnu dot org 2004-12-16 23:35 ------- Confirmed. -- What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |NEW Ever Confirmed| |1 Keywords| |wrong-code Last reconfirmed|0000-00-00 00:00:00 |2004-12-16 23:35:31 date| | http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19044 ^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug c++/19044] Alternate asm name for atan ignored when calling __builtin_atan 2004-12-16 21:15 [Bug c++/19044] New: Alternate asm name for atan ignored when calling __builtin_atan austern at apple dot com 2004-12-16 23:35 ` [Bug c++/19044] " pinskia at gcc dot gnu dot org @ 2004-12-18 1:17 ` austern at apple dot com 2004-12-18 18:35 ` pinskia at gcc dot gnu dot org ` (2 subsequent siblings) 4 siblings, 0 replies; 6+ messages in thread From: austern at apple dot com @ 2004-12-18 1:17 UTC (permalink / raw) To: gcc-bugs ------- Additional Comments From austern at apple dot com 2004-12-18 01:17 ------- The code in the C front end that handles this is in finish_decl, in c-decl.c: if (TREE_CODE (decl) == FUNCTION_DECL && asmspec) { if (DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL) { tree builtin = built_in_decls [DECL_FUNCTION_CODE (decl)]; set_user_assembler_name (builtin, asmspec); if (DECL_FUNCTION_CODE (decl) == BUILT_IN_MEMCPY) init_block_move_fn (asmspec); else if (DECL_FUNCTION_CODE (decl) == BUILT_IN_MEMSET) init_block_clear_fn (asmspec); } set_user_assembler_name (decl, asmspec); } -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19044 ^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug c++/19044] Alternate asm name for atan ignored when calling __builtin_atan 2004-12-16 21:15 [Bug c++/19044] New: Alternate asm name for atan ignored when calling __builtin_atan austern at apple dot com 2004-12-16 23:35 ` [Bug c++/19044] " pinskia at gcc dot gnu dot org 2004-12-18 1:17 ` austern at apple dot com @ 2004-12-18 18:35 ` pinskia at gcc dot gnu dot org 2004-12-20 20:12 ` cvs-commit at gcc dot gnu dot org 2004-12-20 20:40 ` pinskia at gcc dot gnu dot org 4 siblings, 0 replies; 6+ messages in thread From: pinskia at gcc dot gnu dot org @ 2004-12-18 18:35 UTC (permalink / raw) To: gcc-bugs ------- Additional Comments From pinskia at gcc dot gnu dot org 2004-12-18 18:35 ------- Patch here: <http://gcc.gnu.org/ml/gcc-patches/2004-12/msg01351.html>. -- What |Removed |Added ---------------------------------------------------------------------------- Keywords| |patch http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19044 ^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug c++/19044] Alternate asm name for atan ignored when calling __builtin_atan 2004-12-16 21:15 [Bug c++/19044] New: Alternate asm name for atan ignored when calling __builtin_atan austern at apple dot com ` (2 preceding siblings ...) 2004-12-18 18:35 ` pinskia at gcc dot gnu dot org @ 2004-12-20 20:12 ` cvs-commit at gcc dot gnu dot org 2004-12-20 20:40 ` pinskia at gcc dot gnu dot org 4 siblings, 0 replies; 6+ messages in thread From: cvs-commit at gcc dot gnu dot org @ 2004-12-20 20:12 UTC (permalink / raw) To: gcc-bugs ------- Additional Comments From cvs-commit at gcc dot gnu dot org 2004-12-20 20:11 ------- Subject: Bug 19044 CVSROOT: /cvs/gcc Module name: gcc Changes by: austern@gcc.gnu.org 2004-12-20 20:11:42 Modified files: gcc : ChangeLog c-common.c c-common.h c-decl.c gcc/cp : ChangeLog decl.c gcc/testsuite : ChangeLog Added files: gcc/testsuite/g++.dg/ext: builtin6.C Log message: PR c++/19044 * c-common.c (set_builtin_user_assembler_name): New. * c-common.h (set_builtin_user_assembler_name): Declare. * c-decl.c (finish_decl): Use set_builtin_user_assembler_name * decl.c (make_rtl_for_nonlocal_decl): Use set_builtin_user_assembler_name * g++.dg/ext/builtin6.C: New Patches: http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/ChangeLog.diff?cvsroot=gcc&r1=2.6900&r2=2.6901 http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/c-common.c.diff?cvsroot=gcc&r1=1.594&r2=1.595 http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/c-common.h.diff?cvsroot=gcc&r1=1.272&r2=1.273 http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/c-decl.c.diff?cvsroot=gcc&r1=1.616&r2=1.617 http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/cp/ChangeLog.diff?cvsroot=gcc&r1=1.4543&r2=1.4544 http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/cp/decl.c.diff?cvsroot=gcc&r1=1.1342&r2=1.1343 http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/testsuite/ChangeLog.diff?cvsroot=gcc&r1=1.4785&r2=1.4786 http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/testsuite/g++.dg/ext/builtin6.C.diff?cvsroot=gcc&r1=NONE&r2=1.1 -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19044 ^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug c++/19044] Alternate asm name for atan ignored when calling __builtin_atan 2004-12-16 21:15 [Bug c++/19044] New: Alternate asm name for atan ignored when calling __builtin_atan austern at apple dot com ` (3 preceding siblings ...) 2004-12-20 20:12 ` cvs-commit at gcc dot gnu dot org @ 2004-12-20 20:40 ` pinskia at gcc dot gnu dot org 4 siblings, 0 replies; 6+ messages in thread From: pinskia at gcc dot gnu dot org @ 2004-12-20 20:40 UTC (permalink / raw) To: gcc-bugs ------- Additional Comments From pinskia at gcc dot gnu dot org 2004-12-20 20:40 ------- Fixed. -- What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |RESOLVED Resolution| |FIXED Target Milestone|--- |4.0.0 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19044 ^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2004-12-20 20:40 UTC | newest] Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2004-12-16 21:15 [Bug c++/19044] New: Alternate asm name for atan ignored when calling __builtin_atan austern at apple dot com 2004-12-16 23:35 ` [Bug c++/19044] " pinskia at gcc dot gnu dot org 2004-12-18 1:17 ` austern at apple dot com 2004-12-18 18:35 ` pinskia at gcc dot gnu dot org 2004-12-20 20:12 ` cvs-commit at gcc dot gnu dot org 2004-12-20 20:40 ` pinskia at gcc dot gnu dot org
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