From 8691f6f7306914d8fc9d5afc8a347ebf5ce0a7d7 Mon Sep 17 00:00:00 2001
From: Adrian Kummerlaender
Date: Mon, 23 Aug 2021 22:04:50 +0200
Subject: Replace InitializeO by memset

---
 tangle/LLBM/kernel/collect_q_criterion.h |  2 +-
 tangle/LLBM/kernel/initialize.h          | 44 --------------------------------
 tangle/LLBM/lattice.h                    |  1 -
 tangle/LLBM/propagate.h                  |  8 ++++--
 4 files changed, 7 insertions(+), 48 deletions(-)
 delete mode 100644 tangle/LLBM/kernel/initialize.h

(limited to 'tangle/LLBM')

diff --git a/tangle/LLBM/kernel/collect_q_criterion.h b/tangle/LLBM/kernel/collect_q_criterion.h
index fa19dc7..6f770e5 100644
--- a/tangle/LLBM/kernel/collect_q_criterion.h
+++ b/tangle/LLBM/kernel/collect_q_criterion.h
@@ -14,7 +14,7 @@ __device__ static void apply(
   , std::size_t iX
   , std::size_t iY
   , std::size_t iZ
-  , T* cell_rho 
+  , T* cell_rho
   , T* cell_u
   , T* cell_curl_norm
   , cudaSurfaceObject_t surface
diff --git a/tangle/LLBM/kernel/initialize.h b/tangle/LLBM/kernel/initialize.h
deleted file mode 100644
index 221b9ad..0000000
--- a/tangle/LLBM/kernel/initialize.h
+++ /dev/null
@@ -1,44 +0,0 @@
-#pragma once
-#include <LLBM/call_tag.h>
-
-struct InitializeO {
-
-using call_tag = tag::call_by_cell_id;
-
-template <typename T, typename S>
-__device__ static void apply(descriptor::D2Q9, S f_curr[9], S f_next[9], std::size_t gid) {
-  f_next[0] = T{0.0277777777777778};
-  f_next[1] = T{0.111111111111111};
-  f_next[2] = T{0.0277777777777778};
-  f_next[3] = T{0.111111111111111};
-  f_next[4] = T{0.444444444444444};
-  f_next[5] = T{0.111111111111111};
-  f_next[6] = T{0.0277777777777778};
-  f_next[7] = T{0.111111111111111};
-  f_next[8] = T{0.0277777777777778};
-}
-
-template <typename T, typename S>
-__device__ static void apply(descriptor::D3Q19, S f_curr[19], S f_next[19], std::size_t gid) {
-  f_next[0] = T{0.0277777777777778};
-  f_next[1] = T{0.0277777777777778};
-  f_next[2] = T{0.0555555555555556};
-  f_next[3] = T{0.0277777777777778};
-  f_next[4] = T{0.0277777777777778};
-  f_next[5] = T{0.0277777777777778};
-  f_next[6] = T{0.0555555555555556};
-  f_next[7] = T{0.0277777777777778};
-  f_next[8] = T{0.0555555555555556};
-  f_next[9] = T{0.333333333333333};
-  f_next[10] = T{0.0555555555555556};
-  f_next[11] = T{0.0277777777777778};
-  f_next[12] = T{0.0555555555555556};
-  f_next[13] = T{0.0277777777777778};
-  f_next[14] = T{0.0277777777777778};
-  f_next[15] = T{0.0277777777777778};
-  f_next[16] = T{0.0555555555555556};
-  f_next[17] = T{0.0277777777777778};
-  f_next[18] = T{0.0277777777777778};
-}
-
-};
diff --git a/tangle/LLBM/lattice.h b/tangle/LLBM/lattice.h
index 8ba1d66..7157c78 100644
--- a/tangle/LLBM/lattice.h
+++ b/tangle/LLBM/lattice.h
@@ -5,7 +5,6 @@
 #include "operator.h"
 
 #include "propagate.h"
-#include "kernel/initialize.h"
 #include "kernel/executor.h"
 
 template <typename DESCRIPTOR, typename T, typename S=T>
diff --git a/tangle/LLBM/propagate.h b/tangle/LLBM/propagate.h
index d63ccd8..acb1d6c 100644
--- a/tangle/LLBM/propagate.h
+++ b/tangle/LLBM/propagate.h
@@ -79,7 +79,7 @@ CyclicPopulationBuffer<DESCRIPTOR,S>::CyclicPopulationBuffer(
 
   for (unsigned iPop=0; iPop < DESCRIPTOR::q; ++iPop) {
     // per-population handle until cuMemMap accepts non-zero offset
-    cuMemCreate(&_handle[iPop], _volume, &_prop, 0); 
+    cuMemCreate(&_handle[iPop], _volume, &_prop, 0);
     cuMemMap(_ptr + iPop * 2 * _volume,           _volume, 0, _handle[iPop], 0);
     cuMemMap(_ptr + iPop * 2 * _volume + _volume, _volume, 0, _handle[iPop], 0);
   }
@@ -88,7 +88,11 @@ CyclicPopulationBuffer<DESCRIPTOR,S>::CyclicPopulationBuffer(
   _access.location.id = 0;
   _access.flags = CU_MEM_ACCESS_FLAGS_PROT_READWRITE;
   cuMemSetAccess(_ptr, 2 * _volume * DESCRIPTOR::q, &_access, 1);
-  cuMemsetD8(_ptr, 0, 2 * _volume * DESCRIPTOR::q);
+
+  for (unsigned iPop=0; iPop < DESCRIPTOR::q; ++iPop) {
+    float eq = descriptor::weight<DESCRIPTOR>(iPop);
+    cuMemsetD32(_ptr + iPop * 2 * _volume, *reinterpret_cast<int*>(&eq), 2 * (_volume / sizeof(S)));
+  }
 
   for (unsigned iPop=0; iPop < DESCRIPTOR::q; ++iPop) {
     _base[iPop] = device() + iPop * 2 * (_volume / sizeof(S));
-- 
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