--- Comment #14 from bonzini at gnu dot org 2008-04-02 09:57 ---
committed to trunk as 133828
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bonzini at gnu dot org changed:
What|Removed |Added
--- Comment #12 from bonzini at gnu dot org 2008-03-11 16:49 ---
For 4.4, both mul16 and mul32 will be fixed by the pending patch.
The pending patch is what cures the regression part of this bug.
--- Comment #13 from bonzini at gnu dot org 2008-03-11 16:49 ---
Subject: Bug
--- Comment #12 from bonzini at gnu dot org 2008-03-11 16:49 ---
For 4.4, both mul16 and mul32 will be fixed by the pending patch.
The pending patch is what cures the regression part of this bug.
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bonzini at gnu dot org changed:
What|Removed
--- Comment #10 from bonzini at gnu dot org 2008-03-10 14:14 ---
I have a patch.
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bonzini at gnu dot org changed:
What|Removed |Added
AssignedTo|unassigned at
--- Comment #11 from bonzini at gnu dot org 2008-03-10 15:19 ---
The patch at http://gcc.gnu.org/ml/gcc-patches/2008-03/msg00623.html fixes
mul16.
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bonzini at gnu dot org changed:
What|Removed |Added
--- Comment #5 from rguenth at gcc dot gnu dot org 2008-03-05 10:27 ---
With -O we even have
movl$0, %edx
movla, %ecx
imull %edx, %ecx
I wonder why we do not constant-propagate / simplify here?
Note that with 4.2 and 4.1 mul16 is also bad. Setting
--- Comment #6 from ubizjak at gmail dot com 2008-03-05 10:32 ---
4.2 figures out in cse1 pass that:
(insn 9 8 10 2 (parallel [
(set (reg:DI 60 [ b ])
(zero_extend:DI (mem/c/i:SI (symbol_ref:SI (b) var_decl
0xb7caf108 b) [3 b+0 S4 A32])))
--- Comment #7 from ubizjak at gmail dot com 2008-03-05 11:10 ---
It looks that:
2006-11-03 Paolo Bonzini [EMAIL PROTECTED]
Steven Bosscher [EMAIL PROTECTED]
* fwprop.c: New file.
...
* cse.c (fold_rtx_subreg, fold_rtx_mem, fold_rtx_mem_1,
--- Comment #8 from bonzini at gnu dot org 2008-03-05 13:21 ---
Should be handled by this code in simplify_subreg:
/* A SUBREG resulting from a zero extension may fold to zero if
it extracts higher bits that the ZERO_EXTEND's source bits. */
if (GET_CODE (op) ==
--- Comment #9 from bonzini at gnu dot org 2008-03-05 13:22 ---
fwprop does not because the memory is written to
(and fwprop does not do alias analysis).
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35281
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