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* [Bug target/16657] New: Dead stack adjustion code not removed
@ 2004-07-21 12:32 falk at debian dot org
2004-08-15 4:06 ` [Bug target/16657] " pinskia at gcc dot gnu dot org
2005-05-18 17:15 ` rth at gcc dot gnu dot org
0 siblings, 2 replies; 3+ messages in thread
From: falk at debian dot org @ 2004-07-21 12:32 UTC (permalink / raw)
To: gcc-bugs
struct s2 { unsigned long a, b; };
unsigned long f8(struct s2 x) { return x.a + x.b; }
gets compiled to
addq a1,a0,v0
lda sp,-16(sp)
lda sp,16(sp)
ret
The reason is probably that the structs get spilled to the stack, and
then the store/load is optimized out, but the stack adjustion remains.
Similar to the fixed PR 6882.
--
Summary: Dead stack adjustion code not removed
Product: gcc
Version: 3.5.0
Status: UNCONFIRMED
Keywords: missed-optimization
Severity: enhancement
Priority: P2
Component: target
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: falk at debian dot org
CC: gcc-bugs at gcc dot gnu dot org
GCC build triplet: alphaev68-unknown-linux-gnu
GCC host triplet: alphaev68-unknown-linux-gnu
GCC target triplet: alphaev68-unknown-linux-gnu
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=16657
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug target/16657] Dead stack adjustion code not removed
2004-07-21 12:32 [Bug target/16657] New: Dead stack adjustion code not removed falk at debian dot org
@ 2004-08-15 4:06 ` pinskia at gcc dot gnu dot org
2005-05-18 17:15 ` rth at gcc dot gnu dot org
1 sibling, 0 replies; 3+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2004-08-15 4:06 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From pinskia at gcc dot gnu dot org 2004-08-15 04:05 -------
Confirmed.
--
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Ever Confirmed| |1
Last reconfirmed|0000-00-00 00:00:00 |2004-08-15 04:05:59
date| |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=16657
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug target/16657] Dead stack adjustion code not removed
2004-07-21 12:32 [Bug target/16657] New: Dead stack adjustion code not removed falk at debian dot org
2004-08-15 4:06 ` [Bug target/16657] " pinskia at gcc dot gnu dot org
@ 2005-05-18 17:15 ` rth at gcc dot gnu dot org
1 sibling, 0 replies; 3+ messages in thread
From: rth at gcc dot gnu dot org @ 2005-05-18 17:15 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From rth at gcc dot gnu dot org 2005-05-18 17:15 -------
We don't assign TImode to this structure, because we assume TImode needs
128-bit alignment, and this structure has 64-bit alignment. Which means
that the structure gets BLKmode. All BLKmode parameters are allocated
stack space in assign_parm_setup_block.
What we'd like to do is allocate a TImode register anyway.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=16657
^ permalink raw reply [flat|nested] 3+ messages in thread
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2004-07-21 12:32 [Bug target/16657] New: Dead stack adjustion code not removed falk at debian dot org
2004-08-15 4:06 ` [Bug target/16657] " pinskia at gcc dot gnu dot org
2005-05-18 17:15 ` rth at gcc dot gnu dot org
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