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* [Bug target/57150] New: GCC when targeting power7 spills long double using VSX instructions.
@ 2013-05-02 19:36 meissner at gcc dot gnu.org
2013-05-02 19:37 ` [Bug target/57150] " meissner at gcc dot gnu.org
` (4 more replies)
0 siblings, 5 replies; 6+ messages in thread
From: meissner at gcc dot gnu.org @ 2013-05-02 19:36 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57150
Bug #: 57150
Summary: GCC when targeting power7 spills long double using VSX
instructions.
Classification: Unclassified
Product: gcc
Version: 4.9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
AssignedTo: unassigned@gcc.gnu.org
ReportedBy: meissner@gcc.gnu.org
Created attachment 30008
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=30008
Cut down example to show the problem, using -mcpu=power7 -m64
In the glibc file e_scalbl.c, the compiler is using VSX stxvd2x and lxvd2x
instructions to spill long double, even though only 1/2 of the register is
used. The compiler should use scalar load/store instructions.
^ permalink raw reply [flat|nested] 6+ messages in thread* [Bug target/57150] GCC when targeting power7 spills long double using VSX instructions. 2013-05-02 19:36 [Bug target/57150] New: GCC when targeting power7 spills long double using VSX instructions meissner at gcc dot gnu.org @ 2013-05-02 19:37 ` meissner at gcc dot gnu.org 2013-05-02 19:42 ` meissner at gcc dot gnu.org ` (3 subsequent siblings) 4 siblings, 0 replies; 6+ messages in thread From: meissner at gcc dot gnu.org @ 2013-05-02 19:37 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57150 --- Comment #1 from Michael Meissner <meissner at gcc dot gnu.org> 2013-05-02 19:37:21 UTC --- Created attachment 30009 --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=30009 Assembler file ^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug target/57150] GCC when targeting power7 spills long double using VSX instructions. 2013-05-02 19:36 [Bug target/57150] New: GCC when targeting power7 spills long double using VSX instructions meissner at gcc dot gnu.org 2013-05-02 19:37 ` [Bug target/57150] " meissner at gcc dot gnu.org @ 2013-05-02 19:42 ` meissner at gcc dot gnu.org 2013-05-02 21:03 ` meissner at gcc dot gnu.org ` (2 subsequent siblings) 4 siblings, 0 replies; 6+ messages in thread From: meissner at gcc dot gnu.org @ 2013-05-02 19:42 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57150 Michael Meissner <meissner at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Target| |powerpc64-gnu-linux Status|UNCONFIRMED |ASSIGNED Last reconfirmed| |2013-05-02 Host| |powerp64-gnu-linux Ever Confirmed|0 |1 Known to fail| |4.5.0 Build| |powerpc64-gnu-linux --- Comment #2 from Michael Meissner <meissner at gcc dot gnu.org> 2013-05-02 19:42:51 UTC --- This goes back to the original VSX submission for GCC 4.5. While the code is slow, it does appear to be correct. ^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug target/57150] GCC when targeting power7 spills long double using VSX instructions. 2013-05-02 19:36 [Bug target/57150] New: GCC when targeting power7 spills long double using VSX instructions meissner at gcc dot gnu.org 2013-05-02 19:37 ` [Bug target/57150] " meissner at gcc dot gnu.org 2013-05-02 19:42 ` meissner at gcc dot gnu.org @ 2013-05-02 21:03 ` meissner at gcc dot gnu.org 2013-05-03 19:18 ` meissner at gcc dot gnu.org 2013-05-07 16:26 ` meissner at gcc dot gnu.org 4 siblings, 0 replies; 6+ messages in thread From: meissner at gcc dot gnu.org @ 2013-05-02 21:03 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57150 --- Comment #3 from Michael Meissner <meissner at gcc dot gnu.org> 2013-05-02 21:03:08 UTC --- It shows up due to -fcaller-saves, which creates a V2DF save area. ^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug target/57150] GCC when targeting power7 spills long double using VSX instructions. 2013-05-02 19:36 [Bug target/57150] New: GCC when targeting power7 spills long double using VSX instructions meissner at gcc dot gnu.org ` (2 preceding siblings ...) 2013-05-02 21:03 ` meissner at gcc dot gnu.org @ 2013-05-03 19:18 ` meissner at gcc dot gnu.org 2013-05-07 16:26 ` meissner at gcc dot gnu.org 4 siblings, 0 replies; 6+ messages in thread From: meissner at gcc dot gnu.org @ 2013-05-03 19:18 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57150 --- Comment #4 from Michael Meissner <meissner at gcc dot gnu.org> 2013-05-03 19:18:21 UTC --- Created attachment 30028 --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=30028 Patch to use scalar modes for TF/TD caller saves. ^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug target/57150] GCC when targeting power7 spills long double using VSX instructions. 2013-05-02 19:36 [Bug target/57150] New: GCC when targeting power7 spills long double using VSX instructions meissner at gcc dot gnu.org ` (3 preceding siblings ...) 2013-05-03 19:18 ` meissner at gcc dot gnu.org @ 2013-05-07 16:26 ` meissner at gcc dot gnu.org 4 siblings, 0 replies; 6+ messages in thread From: meissner at gcc dot gnu.org @ 2013-05-07 16:26 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57150 Michael Meissner <meissner at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|ASSIGNED |RESOLVED Resolution| |FIXED --- Comment #5 from Michael Meissner <meissner at gcc dot gnu.org> 2013-05-07 16:26:02 UTC --- Fixed in subversion id 198593. ^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2013-05-07 16:26 UTC | newest] Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2013-05-02 19:36 [Bug target/57150] New: GCC when targeting power7 spills long double using VSX instructions meissner at gcc dot gnu.org 2013-05-02 19:37 ` [Bug target/57150] " meissner at gcc dot gnu.org 2013-05-02 19:42 ` meissner at gcc dot gnu.org 2013-05-02 21:03 ` meissner at gcc dot gnu.org 2013-05-03 19:18 ` meissner at gcc dot gnu.org 2013-05-07 16:26 ` meissner at gcc dot gnu.org
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