https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53949
Oleg Endo <olegendo at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2015-01-30
Ever confirmed|0 |1
--- Comment #12 from Oleg Endo <olegendo at gcc dot gnu.org> ---
This is an example from Renesas public material regarding the SH-DSP. The
example program can utilize either the regular mac.w instruction, or the DSP
ISA (found on SH2-DSP, SH3-DSP, SH4AL-DSP).
typedef short Fixed;
typedef long Lfixed;
typedef long Laccum;
#define __X
#define __Y
void func(__X Fixed x[5],Fixed *out, __Y Fixed y[128][5] )
{
int i;
__Y Fixed *yp=y[0];
__X Fixed *xp=x;
Fixed x0,y0;
Lfixed m0;
Laccum a0;
for(i=0;i<128;i++)
{
a0=0;
x0=*xp++; y0=*yp++;
m0=x0*y0; x0=*xp++; y0=*yp++;
a0+=m0; m0=x0*y0; x0=*xp++; y0=*yp++;
a0+=m0; m0=x0*y0; x0=*xp++; y0=*yp++;
a0+=m0; m0=x0*y0; x0=*xp++; y0=*yp++;
a0+=m0; m0=x0*y0;
a0+=m0;
*out++=a0;
}
}
which should compile to something like:
_func:
mov #-128,r1
mov r5,r3
extu.b r1,r1
.L11:
clrmac
mac.w @r6+,@r4+
dt r1
mac.w @r6+,@r4+
mac.w @r6+,@r4+
mac.w @r6+,@r4+
sts macl,r2
mov.w r2,@r3
bf/s .L11
add #2,r3
rts
nop
