* GCC vectorization of math functions similar to what LLVM does...
@ 2014-09-25 13:27 leon zadorin
2014-09-26 11:12 ` James Greenhalgh
0 siblings, 1 reply; 2+ messages in thread
From: leon zadorin @ 2014-09-25 13:27 UTC (permalink / raw)
To: gcc-help
Hello,
a quick question on whether GCC can do (auto) vectorization of math
functions like pow, exp, log, sin, cos, et. al. as per similar to what
LLVM suggests of being able to do:
http://llvm.org/docs/Vectorizers.html#vectorization-of-function-calls
Is GCC (e.g. 4.9.1) capable of something similar?
Regards
Leon.
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: GCC vectorization of math functions similar to what LLVM does...
2014-09-25 13:27 GCC vectorization of math functions similar to what LLVM does leon zadorin
@ 2014-09-26 11:12 ` James Greenhalgh
0 siblings, 0 replies; 2+ messages in thread
From: James Greenhalgh @ 2014-09-26 11:12 UTC (permalink / raw)
To: leon zadorin; +Cc: gcc-help
On Thu, Sep 25, 2014 at 02:27:04PM +0100, leon zadorin wrote:
> Hello,
>
> a quick question on whether GCC can do (auto) vectorization of math
> functions like pow, exp, log, sin, cos, et. al. as per similar to what
> LLVM suggests of being able to do:
> http://llvm.org/docs/Vectorizers.html#vectorization-of-function-calls
>
> Is GCC (e.g. 4.9.1) capable of something similar?
Yes, though as with LLVM, which builtin functions are considered for
vectorization will depend on the architecture you are targetting.
The relevant target hook to look for in the GCC sources is
"TARGET_VECTORIZE_BUILTIN_VECTORIZED_FUNCTION" [1].
Cheers,
James
---
[1] https://gcc.gnu.org/onlinedocs/gccint/Addressing-Modes.html#Addressing-Modes
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