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Remove a sync from iter.

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A small but consistent improvement.
This commit is contained in:
Steven Robertson 2011-10-11 14:56:23 -04:00
parent 095936666e
commit b081bc9378
1 changed files with 20 additions and 18 deletions
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38
cuburn/code/iter.py
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@ -100,6 +100,16 @@ void iter(mwc_st *msts, iter_info *infos, float4 *accbuf, float *denbuf) {
if (threadIdx.y == 0 && threadIdx.x == 0)
nsamps = {{packer.get("cp.width * cp.height / cp.ntemporal_samples * cp.adj_density")}};
{{if features.chaos_used}}
int last_xf_used = 0;
{{else}}
// Size can be reduced by a factor of four using a slower 4-stage reduce
__shared__ float swap[2048];
__shared__ float cosel[16];
if (threadIdx.y == 0 && threadIdx.x < 16)
cosel[threadIdx.x] = mwc_next_01(rctx);
{{endif}}
__syncthreads();
int consec_bad = -{{features.fuse}};
@ -108,32 +118,14 @@ void iter(mwc_st *msts, iter_info *infos, float4 *accbuf, float *denbuf) {
y = mwc_next_11(rctx);
color = mwc_next_01(rctx);
{{if features.chaos_used}}
int last_xf_used = 0;
{{else}}
// Size can be reduced by a factor of four using a slower 4-stage reduce
__shared__ float swap[2048];
__shared__ float cosel[16];
{{endif}}
while (1) {
{{if features.chaos_used}}
// For now, we can't use the swap buffer with chaos enabled
float xfsel = mwc_next_01(rctx);
// Needed to match the behavior of the loop with swapping
__syncthreads();
{{else}}
if (threadIdx.y == 0 && threadIdx.x < 16) {
cosel[threadIdx.x] = mwc_next_01(rctx);
}
__syncthreads();
float xfsel = cosel[threadIdx.y];
{{endif}}
// This is moved from outside the conditional to avoid needing an extra
// __syncthreads on every loop
if (nsamps < 0) break;
{{if features.chaos_used}}
{{for density_row_idx, prior_xform_idx in enumerate(features.std_xforms)}}
{{for density_col_idx, this_xform_idx in enumerate(features.std_xforms)}}
@ -167,6 +159,16 @@ void iter(mwc_st *msts, iter_info *infos, float4 *accbuf, float *denbuf) {
swap[sw+1024] = y;
swap[sw+1536] = color;
__syncthreads();
// This is in the middle of the function so that only one sync is
// required per loop.
if (nsamps < 0) break;
{{if not features.chaos_used}}
// Similarly, we select the next xforms here.
if (threadIdx.y == 0 && threadIdx.x < 16)
cosel[threadIdx.x] = mwc_next_01(rctx);
{{endif}}
consec_bad = swap[sr];
x = swap[sr+512];
y = swap[sr+1024];