[Bug tree-optimization/40210] gcc needs byte swap builtins

2009-05-20 Thread eric-bugs at omnifarious dot org 


--- Comment #4 from eric-bugs at omnifarious dot org  2009-05-20 19:17 
---
Ahh, OK.  I hunted a bit to find something like that, but didn't find it. 
Thank you.

I now have a slightly different bug, which is a mild inadequate optimization
bug.  :-)  I'll cut it down to size and paste it in here.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40210

[Bug tree-optimization/40210] gcc needs byte swap builtins

2009-05-20 Thread pinskia at gcc dot gnu dot org 


--- Comment #3 from pinskia at gcc dot gnu dot org  2009-05-20 19:04 ---
So there are builtins in 4.3.0 and above.  And there is a patch floating around
to automatically change the manually written byte swap into the builtins.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40210

[Bug tree-optimization/40210] gcc needs byte swap builtins

2009-05-20 Thread pinskia at gcc dot gnu dot org 


--- Comment #2 from pinskia at gcc dot gnu dot org  2009-05-20 19:03 ---
Also see http://gcc.gnu.org/ml/gcc-patches/2009-02/msg00421.html .


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40210

[Bug tree-optimization/40210] gcc needs byte swap builtins

2009-05-20 Thread pinskia at gcc dot gnu dot org 


--- Comment #1 from pinskia at gcc dot gnu dot org  2009-05-20 19:01 ---
http://gcc.gnu.org/onlinedocs/gcc-4.3.0/gcc/Other-Builtins.html#Other-Builtins


— Built-in Function: int32_t __builtin_bswap32 (int32_t x)
Returns x with the order of the bytes reversed; for example, 0xaabbccdd becomes
0xddccbbaa. Byte here always means exactly 8 bits.

— Built-in Function: int64_t __builtin_bswap64 (int64_t x)
Similar to __builtin_bswap32, except the argument and return types are 64-bit.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40210