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* [Bug tree-optimization/50824] New: memset or memcpy on structure prevents SRA
@ 2011-10-21 15:26 andi-gcc at firstfloor dot org
2011-10-23 10:57 ` [Bug tree-optimization/50824] " rguenth at gcc dot gnu.org
0 siblings, 1 reply; 2+ messages in thread
From: andi-gcc at firstfloor dot org @ 2011-10-21 15:26 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50824
Bug #: 50824
Summary: memset or memcpy on structure prevents SRA
Classification: Unclassified
Product: gcc
Version: 4.7.0
Status: UNCONFIRMED
Severity: enhancement
Priority: P3
Component: tree-optimization
AssignedTo: unassigned@gcc.gnu.org
ReportedBy: andi-gcc@firstfloor.org
Clearing a structure using memset or copying it using memcpy currently
disables SRA for the structure because it counts as escaping.
Since this is common it would be better
if it was handled. Clearing it using an initializer or copying it with
= already works, so those could be handled the same way.
^ permalink raw reply [flat|nested] 2+ messages in thread
* [Bug tree-optimization/50824] memset or memcpy on structure prevents SRA
2011-10-21 15:26 [Bug tree-optimization/50824] New: memset or memcpy on structure prevents SRA andi-gcc at firstfloor dot org
@ 2011-10-23 10:57 ` rguenth at gcc dot gnu.org
0 siblings, 0 replies; 2+ messages in thread
From: rguenth at gcc dot gnu.org @ 2011-10-23 10:57 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50824
Richard Guenther <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |WAITING
Last reconfirmed| |2011-10-23
Ever Confirmed|0 |1
--- Comment #1 from Richard Guenther <rguenth at gcc dot gnu.org> 2011-10-23 10:57:29 UTC ---
No, I think because it counts as address-taken, not because it escapes.
Do you have a testcase? Most memcpys should be folded to a plain assignment
already, but we don't fold memset to zero to = {} I guess.
^ permalink raw reply [flat|nested] 2+ messages in thread
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2011-10-21 15:26 [Bug tree-optimization/50824] New: memset or memcpy on structure prevents SRA andi-gcc at firstfloor dot org
2011-10-23 10:57 ` [Bug tree-optimization/50824] " rguenth at gcc dot gnu.org
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