[Bug tree-optimization/36844] Vectorizer doesn't support INT-FP conversions with different size

[dorit at gcc dot gnu dot org]

--- Comment #2 from dorit at gcc dot gnu dot org  2008-07-22 10:39 ---
(In reply to comment #1)
 One problem is vectorizable_conversion. Is there a way to support
 V4DF/V4DI - D4SI/V4SF
 V8SI - V8SF 

With the current framework, the only way to support 
V8SI - V8SF
is to implement the TARGET_VECTORIZE_BUILTIN_CONVERSION for these modes. 

There's no way in the current framework to support  
V4DF - V4SI
V4DI - V4SF
because of the single-vector-size assumption. These however would be supported:
V4DF - V8SI
V4DI - V8SF
by modeling the idioms unpack[u/s]_float_[lo/hi] and vec_pack_[u/s]fix_trunc
for the respective modes.

I think that in order to really support AVX the vectorizer would need to be
extended to consider multiple vector sizes (which would probably involve more
than just extending the support for conversions).


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36844

[Bug tree-optimization/36844] Vectorizer doesn't support INT-FP conversions with different size

[hjl dot tools at gmail dot com]

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hjl dot tools at gmail dot com changed:

   What|Removed |Added

   Severity|normal  |enhancement


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36844

[Bug tree-optimization/36844] Vectorizer doesn't support INT-FP conversions with different size

[hjl dot tools at gmail dot com]

--- Comment #1 from hjl dot tools at gmail dot com  2008-07-15 21:47 ---
One problem is vectorizable_conversion. Is there a way to support

V4DF/V4DI - D4SI/V4SF
V8SI - V8SF


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36844