Skip to content

Add trivially optimized DSDOT for POWER8 #1371

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
merged 1 commit into from
Nov 29, 2017
Merged

Add trivially optimized DSDOT for POWER8 #1371

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
1 change: 1 addition & 0 deletions kernel/power/KERNEL.POWER8
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -122,6 +122,7 @@ ZCOPYKERNEL = zcopy.c
#
SDOTKERNEL = sdot.c
DDOTKERNEL = ddot.c
DSDOTKERNEL = sdot.c
#CDOTKERNEL = ../arm/zdot.c
ZDOTKERNEL = zdot.c
#
Expand Down
55 changes: 46 additions & 9 deletions kernel/power/sdot.c
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -1,5 +1,5 @@
/***************************************************************************
Copyright (c) 2013-2016, The OpenBLAS Project
Copyright (c) 2013-2017, The OpenBLAS Project
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
Expand Down Expand Up @@ -66,42 +66,76 @@ static FLOAT sdot_kernel_16(BLASLONG n, FLOAT *x, FLOAT *y)

#endif

#if defined (DSDOT)
double CNAME(BLASLONG n, FLOAT *x, BLASLONG inc_x, FLOAT *y, BLASLONG inc_y)
#else
FLOAT CNAME(BLASLONG n, FLOAT *x, BLASLONG inc_x, FLOAT *y, BLASLONG inc_y)
#endif
{
BLASLONG i=0;
BLASLONG ix=0,iy=0;
double dot = 0.0 ;

FLOAT dot = 0.0 ;
#if defined (DSDOT)
double mydot = 0.0;
FLOAT asmdot = 0.0;
#else
FLOAT mydot=0.0;
#endif
BLASLONG n1;

if ( n <= 0 ) return(dot);

if ( (inc_x == 1) && (inc_y == 1) )
{

BLASLONG n1 = n & -32;
n1 = n & (BLASLONG)(-32);

if ( n1 )
dot = sdot_kernel_16(n1, x, y);

#if defined(DSDOT)
{
FLOAT *x1=x;
FLOAT *y1=y;
BLASLONG n2 = 32;
while (i<n1) {
asmdot = sdot_kernel_16(n2, x1, y1);
mydot += (double)asmdot;
asmdot=0.;
x1+=32;
y1+=32;
i+=32;
}
}
#else
mydot = sdot_kernel_16(n1, x, y);
#endif
i = n1;
while(i < n)
{

#if defined(DSDOT)
dot += (double)y[i] * (double)x[i] ;
#else
dot += y[i] * x[i] ;
#endif
i++ ;

}

dot+=mydot;
return(dot);


}

BLASLONG n1 = n & -2;
n1 = n & (BLASLONG)(-2);

while(i < n1)
{

#if defined (DSDOT)
dot += (double)y[iy] * (double)x[ix] + (double)y[iy+inc_y] * (double)x[ix+inc_x];
#else
dot += y[iy] * x[ix] + y[iy+inc_y] * x[ix+inc_x];
#endif
ix += inc_x*2 ;
iy += inc_y*2 ;
i+=2 ;
Expand All @@ -110,8 +144,11 @@ FLOAT CNAME(BLASLONG n, FLOAT *x, BLASLONG inc_x, FLOAT *y, BLASLONG inc_y)

while(i < n)
{

#if defined (DSDOT)
dot += (double)y[iy] * (double)x[ix] ;
#else
dot += y[iy] * x[ix] ;
#endif
ix += inc_x ;
iy += inc_y ;
i++ ;
Expand Down