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* [Bug tree-optimization/16047] New: lno promotion of float scalar to float vector doesn't get hoisted @ 2004-06-18 6:16 tjw at omnigroup dot com 2004-06-18 6:17 ` [Bug tree-optimization/16047] " tjw at omnigroup dot com ` (4 more replies) 0 siblings, 5 replies; 6+ messages in thread From: tjw at omnigroup dot com @ 2004-06-18 6:16 UTC (permalink / raw) To: gcc-bugs When compiled with: $PREFIX/bin/gcc -O2 -ftree-vectorize -fdump-tree-vect-stats -maltivec -S test-add-float.c -o / tmp/test-add-float.s The attached test case produces assembly like: _test: mfspr r12,256 stw r12,-8(r1) oris r12,r12,0xc000 mtspr 256,r12 li r0,128 stfs f1,-48(r1) << Stores float to stack mtctr r0 lwz r9,-48(r1) << Loads it back into a GPR mr r8,r3 stw r31,-4(r1) mr r3,r4 mr r10,r9 mr r11,r9 mr r12,r9 li r2,0 L2: addi r7,r1,-32 << Redundant computation of stack offset lvx v0,r2,r8 stw r9,0(r7) << Stores the GPR version of the float inside the loop stw r10,4(r7) stw r11,8(r7) stw r12,12(r7) lvx v1,0,r7 << Loads the vector off the stack vaddfp v0,v0,v1 stvx v0,r2,r3 addi r2,r2,16 bdnz L2 Instead, this should pick a vector aligned blob of memory on the stack and store the float to element zero. Then, outside, the loop, that vector should be loaded and the elements replicated via a splat instruction. Even if the compiler can't do the splat part yet, the four stores and the load of the vector should be hoisted. -- Summary: lno promotion of float scalar to float vector doesn't get hoisted Product: gcc Version: lno Status: UNCONFIRMED Severity: normal Priority: P2 Component: tree-optimization AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: tjw at omnigroup dot com CC: gcc-bugs at gcc dot gnu dot org GCC build triplet: powerpc-apple-darwin7.4.0 GCC host triplet: powerpc-apple-darwin7.4.0 GCC target triplet: powerpc-apple-darwin7.4.0 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=16047 ^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug tree-optimization/16047] lno promotion of float scalar to float vector doesn't get hoisted 2004-06-18 6:16 [Bug tree-optimization/16047] New: lno promotion of float scalar to float vector doesn't get hoisted tjw at omnigroup dot com @ 2004-06-18 6:17 ` tjw at omnigroup dot com 2004-06-19 6:03 ` pinskia at gcc dot gnu dot org ` (3 subsequent siblings) 4 siblings, 0 replies; 6+ messages in thread From: tjw at omnigroup dot com @ 2004-06-18 6:17 UTC (permalink / raw) To: gcc-bugs ------- Additional Comments From tjw at omnigroup dot com 2004-06-18 06:17 ------- Created an attachment (id=6553) --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=6553&action=view) Test case -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=16047 ^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug tree-optimization/16047] lno promotion of float scalar to float vector doesn't get hoisted 2004-06-18 6:16 [Bug tree-optimization/16047] New: lno promotion of float scalar to float vector doesn't get hoisted tjw at omnigroup dot com 2004-06-18 6:17 ` [Bug tree-optimization/16047] " tjw at omnigroup dot com @ 2004-06-19 6:03 ` pinskia at gcc dot gnu dot org 2004-06-21 19:51 ` dpatel at apple dot com ` (2 subsequent siblings) 4 siblings, 0 replies; 6+ messages in thread From: pinskia at gcc dot gnu dot org @ 2004-06-19 6:03 UTC (permalink / raw) To: gcc-bugs -- What |Removed |Added ---------------------------------------------------------------------------- Keywords| |missed-optimization Target Milestone|--- |lno http://gcc.gnu.org/bugzilla/show_bug.cgi?id=16047 ^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug tree-optimization/16047] lno promotion of float scalar to float vector doesn't get hoisted 2004-06-18 6:16 [Bug tree-optimization/16047] New: lno promotion of float scalar to float vector doesn't get hoisted tjw at omnigroup dot com 2004-06-18 6:17 ` [Bug tree-optimization/16047] " tjw at omnigroup dot com 2004-06-19 6:03 ` pinskia at gcc dot gnu dot org @ 2004-06-21 19:51 ` dpatel at apple dot com 2004-08-15 5:40 ` [Bug target/16047] [PPC] " pinskia at gcc dot gnu dot org 2004-08-25 5:33 ` pinskia at gcc dot gnu dot org 4 siblings, 0 replies; 6+ messages in thread From: dpatel at apple dot com @ 2004-06-21 19:51 UTC (permalink / raw) To: gcc-bugs ------- Additional Comments From dpatel at apple dot com 2004-06-21 19:51 ------- This is a known altivec codegen deficiency. See http://gcc.gnu.org/ml/gcc/2004-03/msg01322.html -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=16047 ^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug target/16047] [PPC] lno promotion of float scalar to float vector doesn't get hoisted 2004-06-18 6:16 [Bug tree-optimization/16047] New: lno promotion of float scalar to float vector doesn't get hoisted tjw at omnigroup dot com ` (2 preceding siblings ...) 2004-06-21 19:51 ` dpatel at apple dot com @ 2004-08-15 5:40 ` pinskia at gcc dot gnu dot org 2004-08-25 5:33 ` pinskia at gcc dot gnu dot org 4 siblings, 0 replies; 6+ messages in thread From: pinskia at gcc dot gnu dot org @ 2004-08-15 5:40 UTC (permalink / raw) To: gcc-bugs ------- Additional Comments From pinskia at gcc dot gnu dot org 2004-08-15 05:40 ------- Confirmed, a target problem. -- What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |NEW Component|tree-optimization |target Ever Confirmed| |1 Last reconfirmed|0000-00-00 00:00:00 |2004-08-15 05:40:21 date| | Summary|lno promotion of float |[PPC] lno promotion of float |scalar to float vector |scalar to float vector |doesn't get hoisted |doesn't get hoisted Target Milestone|lno |--- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=16047 ^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug target/16047] [PPC] lno promotion of float scalar to float vector doesn't get hoisted 2004-06-18 6:16 [Bug tree-optimization/16047] New: lno promotion of float scalar to float vector doesn't get hoisted tjw at omnigroup dot com ` (3 preceding siblings ...) 2004-08-15 5:40 ` [Bug target/16047] [PPC] " pinskia at gcc dot gnu dot org @ 2004-08-25 5:33 ` pinskia at gcc dot gnu dot org 4 siblings, 0 replies; 6+ messages in thread From: pinskia at gcc dot gnu dot org @ 2004-08-25 5:33 UTC (permalink / raw) To: gcc-bugs ------- Additional Comments From pinskia at gcc dot gnu dot org 2004-08-25 05:33 ------- And that would be a dup of bug 10469. *** This bug has been marked as a duplicate of 10469 *** -- What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |RESOLVED Resolution| |DUPLICATE http://gcc.gnu.org/bugzilla/show_bug.cgi?id=16047 ^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2004-08-25 5:33 UTC | newest] Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2004-06-18 6:16 [Bug tree-optimization/16047] New: lno promotion of float scalar to float vector doesn't get hoisted tjw at omnigroup dot com 2004-06-18 6:17 ` [Bug tree-optimization/16047] " tjw at omnigroup dot com 2004-06-19 6:03 ` pinskia at gcc dot gnu dot org 2004-06-21 19:51 ` dpatel at apple dot com 2004-08-15 5:40 ` [Bug target/16047] [PPC] " pinskia at gcc dot gnu dot org 2004-08-25 5:33 ` pinskia at gcc dot gnu dot org
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