Vectorization Post: 302895149

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Special Forums UNIX and Linux Applications High Performance Computing Vectorization Post 302895149 by a3mlord on Friday 28th of March 2014 05:03:17 PM

03-28-2014

Registered User

Vectorization

Hi,

I have the following vectorized code:

Code:

long valor = 0, i=0;

 __m128i vsum, vecPi, vecCi, vecQCi;

 vsum = _mm_set1_epi32(0);

 int32_t * const pA = A->data;
 int32_t * const pB = B->data;

 int sumDot[1];

 for( ; i<SIZE-3 ;i+=4){

 vecPi = _mm_loadu_si128((__m128i *)&(pA)[i] );
 vecCi = _mm_loadu_si128((__m128i *)&(pB)[i] );
 vecQCi = _mm_mullo_epi32(vecPi,vecCi);
 vsum = _mm_add_epi32(vsum,vecQCi);

 } 
 vsum = _mm_hadd_epi32(vsum, vsum);
 vsum = _mm_hadd_epi32(vsum, vsum);
 _mm_storeu_si128((__m128i *)&(sumDot), vsum);

 for( ; i<SIZE; i++)
 valor += A->data[i] * B->data[i];   valor += sumDot[0];

However, as I get overflows, I need to handle those cases. Could you please help me with that?

Thanks

Last edited by bartus11; 03-28-2014 at 06:06 PM.. Reason: Please use [code][/code] tags.

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types32.h

types32.h(3HEAD)                                                      Headers                                                     types32.h(3HEAD)

NAME

       types32.h, types32 - fixed-width data types

SYNOPSIS

       #include <sys/types32.h>

DESCRIPTION

       The  following  fixed-width  data types defined in <sys/types32.h> correspond to the sign and sizes of types in the 32-bit environment that
       can be used for compatibility and interoperability purposes in either the 32-bit or 64-bit environment.

       typedef              int32_t               blkcnt32_t
       typedef              uint32_t              caddr32_t
       typedef              int32_t               clock32_t
       typedef              int32_t               daddr32_t
       typedef              uint32_t              dev32_t
       typedef              uint32_t              fsblkcnt32_t
       typedef              uint32_t              fsfilcnt32_t
       typedef              int32_t               gid32_t
       typedef              int32_t               id32_t
       typedef              uint32_t              ino32_t
       typedef              int32_t               key32_t
       typedef              uint32_t              major32_t
       typedef              uint32_t              minor32_t
       typedef              uint32_t              mode32_t
       typedef              uint32_t              nlink32_t
       typedef              int32_t               pid32_t
       typedef              uint32_t              rlim32_t
       typedef              uint32_t              size32_t
       typedef              int32_t               ssize32_t
       typedef              time32_t              int32_t
       typedef              uid32_t               int32_t

SunOS 5.10                                                          30 Oct 1997                                                   types32.h(3HEAD)