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Optimizing Cache Usage 6
6-33
Example 6-6 Spread Prefetch Instructions
NOTE. To avoid instruction execution stalls due to the
over-utilization of the resource, prefetch instructions
must be interspersed with computational instructions.
top_loop:
prefetchnta [ebx+128]
prefetchnta [ebx+1128]
prefetchnta [ebx+2128]
prefetchnta [ebx+3128]
. . . .
. . . .
prefetchnta [ebx+17128]
prefetchnta [ebx+18128]
prefetchnta [ebx+19128]
prefetchnta [ebx+20128]
movps xmm1, [ebx]
addps xmm2, [ebx+3000]
mulps xmm3, [ebx+4000]
addps xmm1, [ebx+1000]
addps xmm2, [ebx+3016]
mulps xmm1, [ebx+2000]
mulps xmm1, xmm2
. . . . . . . .
. . . . . .
. . . . .
add ebx, 128
cmp ebx, ecx
jl top_loop
top_loop:
prefetchnta [ebx+128]
movps xmm1, [ebx]
addps xmm2, [ebx+3000]
mulps xmm3, [ebx+4000]
prefetchnta [ebx+1128]
addps xmm1, [ebx+1000]
addps xmm2, [ebx+3016]
prefetchnta [ebx+2128]
mulps xmm1, [ebx+2000]
mulps xmm1, xmm2
prefetchnta [ebx+3128]
. . . . . . .
. . .
prefetchnta [ebx+18128]
. . . . . .
prefetchnta [ebx+19128]
. . . . . .
. . . .
prefetchnta [ebx+20128]
add ebx, 128
cmp ebx, ecx
jl top_loop
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