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update the amin function for riscv platform 

improve the amin function with less vector instruction.
only verify it on QEMU.
This commit is contained in:
Wu Zhigang 2021-03-10 11:07:57 -08:00
parent ef0238ba2b
commit 8c6e532358
1 changed files with 64 additions and 132 deletions
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184
kernel/riscv64/amin_vector.c
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@ -58,90 +58,56 @@ USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
FLOAT CNAME(BLASLONG n, FLOAT *x, BLASLONG inc_x)
{
BLASLONG i=0, j=0;
if (n <= 0 || inc_x <= 0) return(0.0);
if (n <= 0 || inc_x <= 0)
return(0.0);
FLOAT minf=FLT_MAX;
unsigned int gvl = 0;
FLOAT_V_T v0, v1, v_min;
MASK_T mask0, mask1;
volatile FLOAT_V_T v0;
FLOAT_V_T v_min, v1;
FLOAT zero = 0.0;
if(inc_x == 1){
gvl = vsetvli(n, RVV_EFLOAT, RVV_M);
if(gvl <= n/2){
v_min = VFMVVF_FLOAT(FLT_MAX, gvl);
for(i=0,j=0; i<n/(gvl*2); i++){
v0 = VLEV_FLOAT(&x[j], gvl);
mask0 = VMFLTVF_FLOAT(v0, 0, gvl);
//v0 = VFRSUBVF_MASK_FLOAT(v0, 0, mask0, gvl);
#if defined(DOUBLE)
asm volatile(
"vor.vv v0, %1, %1\n\t"
"vsetvli x0, %3, e64,m8 \n\t"
"vfrsub.vf %0, %0, %2, v0.t \n\t"
:"+v"(v0)
:"v"(mask0), "f"(zero), "r"(gvl)
:"v0");
#else
asm volatile(
"vor.vv v0, %1, %1\n\t"
"vsetvli x0, %3, e32,m8 \n\t"
"vfrsub.vf %0, %0, %2, v0.t \n\t"
:"+v"(v0)
:"v"(mask0), "f"(zero), "r"(gvl)
:"v0");
#endif
v_min = VFMINVV_FLOAT(v_min, v0, gvl);
v1 = VLEV_FLOAT(&x[j+gvl], gvl);
mask1 = VMFLTVF_FLOAT(v1, 0, gvl);
//v1 = VFRSUBVF_MASK_FLOAT(v1, 0, mask1, gvl);
#if defined(DOUBLE)
asm volatile(
"vor.vv v0, %1, %1\n\t"
"vsetvli x0, %3, e64,m8 \n\t"
"vfrsub.vf %0, %0, %2, v0.t \n\t"
:"+v"(v1)
:"v"(mask1), "f"(zero), "r"(gvl)
:"v0");
#else
asm volatile(
"vor.vv v0, %1, %1\n\t"
"vsetvli x0, %3, e32,m8 \n\t"
"vfrsub.vf %0, %0, %2, v0.t \n\t"
:"+v"(v1)
:"v"(mask1), "f"(zero), "r"(gvl)
:"v0");
#endif
asm volatile(
"vle.v %1, (%4) \n\t"
"vle.v %2, (%5) \n\t"
"vmflt.vf v0, %1, %3 \n\t"
"vfrsub.vf %1, %1, %3, v0.t \n\t"
"vmflt.vf v0, %2, %3 \n\t"
"vfrsub.vf %2, %2, %3, v0.t \n\t"
"vfmin.vv %0, %0, %1 \n\t"
"vfmin.vv %0, %0, %2 \n\t"
:"+v"(v_min)
:"v"(v0), "v"(v1), "f"(zero), "r"(&x[j]), "r"(&x[j+gvl])
:"v0"
);
v_min = VFMINVV_FLOAT(v_min, v1, gvl);
j += gvl*2;
}
v1 = VFMVVF_FLOAT(FLT_MAX, gvl);
v0 = VFREDMINVS_FLOAT(v_min, v1, gvl);
minf = v0[0];
}
for(;j<n;){
gvl = vsetvli(n-j, RVV_EFLOAT, RVV_M);
v0 = VLEV_FLOAT(&x[j], gvl);
mask0 = VMFLTVF_FLOAT(v0, 0, gvl);
//v0 = VFRSUBVF_MASK_FLOAT(v0, 0, mask0, gvl);
#if defined(DOUBLE)
asm volatile(
"vor.vv v0, %1, %1\n\t"
"vsetvli x0, %3, e64,m8 \n\t"
"vfrsub.vf %0, %0, %2, v0.t \n\t"
asm volatile(
"vle.v %0, (%2) \n\t"
"vmflt.vf v0, %0, %1 \n\t"
"vfrsub.vf %0, %0, %1, v0.t \n\t"
:"+v"(v0)
:"v"(mask0), "f"(zero), "r"(gvl)
:"v0");
#else
asm volatile(
"vor.vv v0, %1, %1\n\t"
"vsetvli x0, %3, e32,m8 \n\t"
"vfrsub.vf %0, %0, %2, v0.t \n\t"
:"+v"(v0)
:"v"(mask0), "f"(zero), "r"(gvl)
:"v0");
#endif
:"f"(zero), "r"(&x[j])
:"v0"
);
v1 = VFMVVF_FLOAT(FLT_MAX, gvl);
v0 = VFREDMINVS_FLOAT(v0, v1, gvl);
if(v0[0] < minf)
@ -151,54 +117,29 @@ asm volatile(
}else{
gvl = vsetvli(n, RVV_EFLOAT, RVV_M);
BLASLONG stride_x = inc_x * sizeof(FLOAT);
if(gvl <= n/2){
BLASLONG idx = 0, inc_xv = inc_x * gvl;
v_min = VFMVVF_FLOAT(FLT_MAX, gvl);
for(i=0,j=0; i<n/(gvl*2); i++){
v0 = VLSEV_FLOAT(&x[idx], stride_x, gvl);
mask0 = VMFLTVF_FLOAT(v0, 0, gvl);
//v0 = VFRSUBVF_MASK_FLOAT(v0, 0, mask0, gvl);
#if defined(DOUBLE)
asm volatile(
"vor.vv v0, %1, %1\n\t"
"vsetvli x0, %3, e64,m8 \n\t"
"vfrsub.vf %0, %0, %2, v0.t \n\t"
:"+v"(v0)
:"v"(mask0), "f"(zero), "r"(gvl)
:"v0");
#else
asm volatile(
"vor.vv v0, %1, %1\n\t"
"vsetvli x0, %3, e32,m8 \n\t"
"vfrsub.vf %0, %0, %2, v0.t \n\t"
:"+v"(v0)
:"v"(mask0), "f"(zero), "r"(gvl)
:"v0");
#endif
v_min = VFMINVV_FLOAT(v_min, v0, gvl);
v1 = VLSEV_FLOAT(&x[idx+inc_xv], stride_x, gvl);
mask1 = VMFLTVF_FLOAT(v1, 0, gvl);
//v1 = VFRSUBVF_MASK_FLOAT(v1, 0, mask1, gvl);
#if defined(DOUBLE)
asm volatile(
"vor.vv v0, %1, %1\n\t"
"vsetvli x0, %3, e64,m8 \n\t"
"vfrsub.vf %0, %0, %2, v0.t \n\t"
:"+v"(v1)
:"v"(mask1), "f"(zero), "r"(gvl)
:"v0");
#else
asm volatile(
"vor.vv v0, %1, %1\n\t"
"vsetvli x0, %3, e32,m8 \n\t"
"vfrsub.vf %0, %0, %2, v0.t \n\t"
:"+v"(v1)
:"v"(mask1), "f"(zero), "r"(gvl)
:"v0");
#endif
asm volatile(
"vlse.v %1, (%4), %6 \n\t"
"vlse.v %2, (%5), %6 \n\t"
"vmflt.vf v0, %1, %3 \n\t"
"vfrsub.vf %1, %1, %3, v0.t \n\t"
"vmflt.vf v0, %2, %3 \n\t"
"vfrsub.vf %2, %2, %3, v0.t \n\t"
"vfmin.vv %0, %0, %1 \n\t"
"vfmin.vv %0, %0, %2 \n\t"
:"+v"(v_min)
:"v"(v0), "v"(v1), "f"(zero), "r"(&x[idx]), "r"(&x[idx+inc_xv]), "r"(stride_x)
:"v0"
);
v_min = VFMINVV_FLOAT(v_min, v1, gvl);
j += gvl*2;
idx += inc_xv*2;
}
@ -206,28 +147,18 @@ asm volatile(
v0 = VFREDMINVS_FLOAT(v_min, v1, gvl);
minf = v0[0];
}
for(;j<n;){
gvl = vsetvli(n-j, RVV_EFLOAT, RVV_M);
v0 = VLSEV_FLOAT(&x[j*inc_x], stride_x, gvl);
mask0 = VMFLTVF_FLOAT(v0, 0, gvl);
//v0 = VFRSUBVF_MASK_FLOAT(v0, 0, mask0, gvl);
#if defined(DOUBLE)
asm volatile(
"vor.vv v0, %1, %1\n\t"
"vsetvli x0, %3, e64,m8 \n\t"
"vfrsub.vf %0, %0, %2, v0.t \n\t"
asm volatile(
"vlse.v %0, (%2), %3 \n\t"
"vmflt.vf v0, %0, %1 \n\t"
"vfrsub.vf %0, %0, %1, v0.t \n\t"
:"+v"(v0)
:"v"(mask0), "f"(zero), "r"(gvl)
:"v0");
#else
asm volatile(
"vor.vv v0, %1, %1\n\t"
"vsetvli x0, %3, e32,m8 \n\t"
"vfrsub.vf %0, %0, %2, v0.t \n\t"
:"+v"(v0)
:"v"(mask0), "f"(zero), "r"(gvl)
:"v0");
#endif
:"f"(zero), "r"(&x[j*inc_x]), "r"(stride_x)
:"v0"
);
v1 = VFMVVF_FLOAT(FLT_MAX, gvl);
v0 = VFREDMINVS_FLOAT(v0, v1, gvl);
if(v0[0] < minf)
@ -235,6 +166,7 @@ asm volatile(
j += gvl;
}
}
return(minf);
}