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learn-rust-the-dangerous-way
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Finish part1

This commit is contained in:
Timothy Warren 2020-01-10 16:24:41 -05:00
parent f7198add5e
commit c5d97c5df9
2 changed files with 16 additions and 16 deletions
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2
Makefile
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@ -2,7 +2,7 @@ target:
mkdir -p target
target/nbody.c: target
$(cc) -O3 -fomit-frame-pointer -march=native -funroll-loops \
$(CC) -O3 -fomit-frame-pointer -march=native -funroll-loops \
nbody.c -o target/nbody.c -lm
target/nbody-1:

30
src/main.rs
View File

@ -189,26 +189,26 @@ unsafe fn advance(bodies: *mut body) {
_mm_div_pd(_mm_set1_pd(0.01), distance_Squared),
distance_Reciprocal,
));
}
{
let mut k = 0;
for i in 0..BODIES_COUNT - 1 {
for j in i + 1..BODIES_COUNT {
let i_mass_magnitude = (*bodies.add(i)).mass * magnitudes.0[k];
let j_mass_magnitude = (*bodies.add(j)).mass * magnitudes.0[k];
for m in 0..3 {
(*bodies.add(i)).velocity[m] -= position_Deltas[m].0[k] * j_mass_magnitude;
(*bodies.add(j)).velocity[m] += position_Deltas[m].0[k] * i_mass_magnitude;
}
k += 1;
{
let mut k = 0;
for i in 0..BODIES_COUNT - 1 {
for j in i + 1..BODIES_COUNT {
let i_mass_magnitude = (*bodies.add(i)).mass * magnitudes.0[k];
let j_mass_magnitude = (*bodies.add(j)).mass * magnitudes.0[k];
for m in 0..3 {
(*bodies.add(i)).velocity[m] -= position_Deltas[m].0[k] * j_mass_magnitude;
(*bodies.add(j)).velocity[m] += position_Deltas[m].0[k] * i_mass_magnitude;
}
k += 1;
}
}
}
for i in 0..BODIES_COUNT {
for m in 0..3 {
(*bodies.add(i)).position[m] += 0.01 * (*bodies.add(i)).velocity[m];
}
for i in 0..BODIES_COUNT {
for m in 0..3 {
(*bodies.add(i)).position[m] += 0.01 * (*bodies.add(i)).velocity[m];
}
}
}