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RE: Vectorizer question

From: "Bingfeng Mei" <bmei at broadcom dot com>
To: "Iyer, Balaji V" <balaji dot v dot iyer at intel dot com>, "'gcc at gcc dot gnu dot org'" <gcc at gcc dot gnu dot org>
Date: Thu, 17 May 2012 15:02:45 +0000
Subject: RE: Vectorizer question
References: <BF230D13CA30DD48930C31D4099330000F25F74C@FMSMSX102.amr.corp.intel.com>

If both X & Y are vectors, GCC will report error (at least on our port based on 4.5)
as invalid operands to ==.  Not sure if it is extended for 4.7.

Bingfeng

-----Original Message-----
From: gcc-owner@gcc.gnu.org [mailto:gcc-owner@gcc.gnu.org] On Behalf Of Iyer, Balaji V
Sent: 17 May 2012 00:01
To: 'gcc@gcc.gnu.org'
Subject: Vectorizer question

Hello Everyone,
	I have a question regarding the vectorizer. In the following code below...

Int func (int x, int y)
{
	If (x==y)
		Return (x+y);
	Else
		Return (x-y);
}

If we force the x and y to be vectors of vectorlength 4, then will the if-statement get a vector of booleans or does it get 1 boolean that compares 2 very large values? I guess another way to ask is that, will it logically break it up into 4 if-statements or just 1?

Any help is greatly appreciated!

Thanks,

Balaji V. Iyer.

PS. Please CC me in response  so that I can get to it quickly.

References:
- Vectorizer question
  - From: Iyer, Balaji V

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