Minor M1 change and fix README plot (#87)

* modify init_(a/b)cache, don't pack B if there is no bcache

* Fix README link.

Author: chriselrod

README.md

@@ -57,7 +57,7 @@ Environment:
   JULIA_NUM_THREADS = 36
 ```
 Resulted in the following:
-![octavian10980xebench](https://github.com/JuliaLinearAlgebra/Octavian.jl/tree/master/docs/src/assets/bench10980xe.png)
+![octavian10980xebench](https://raw.githubusercontent.com/JuliaLinearAlgebra/Octavian.jl/master/docs/src/assets/bench10980xe.png)
 
 ## Related Packages
 

src/init.jl

@@ -14,14 +14,19 @@ function __init__()
 end
 
 function init_bcache()
-    BCACHEPTR[] = VectorizationBase.valloc(second_cache_size() * bcache_count(), Cvoid, ccall(:jl_getpagesize, Int, ()))
+    if bcache_count() ≢ Zero()
+        BCACHEPTR[] = VectorizationBase.valloc(second_cache_size() * bcache_count(), Cvoid, ccall(:jl_getpagesize, Int, ()))
+    end
     nothing
 end
 
-function init_acache()
-    Sys.WORD_SIZE ≤ 32 || return
-    ACACHEPTR[] = VectorizationBase.valloc(first_cache_size() * init_num_tasks(), Cvoid, ccall(:jl_getpagesize, Int, ()))
-    nothing
+if Sys.WORD_SIZE ≤ 32
+    function init_acache()
+        ACACHEPTR[] = VectorizationBase.valloc(first_cache_size() * init_num_tasks(), Cvoid, ccall(:jl_getpagesize, Int, ()))
+        nothing
+    end
+else
+    init_acache() = nothing
 end
 
 function init_num_tasks()

src/matmul.jl

@@ -355,7 +355,7 @@ function __matmul!(
         # `nᵣ*nspawn ≥ N` is needed at the moment to avoid accidentally splitting `N` to be `< nᵣ` while packing
         # Should probably handle that with a smarter splitting function...
         matmulsplitn!(C, A, B, α, β, Mc, M, K, N, nspawn, Val{false}())
-    elseif ((nspawn*(W+W) > M) || (contiguousstride1(B) ? (roundtostaticint(Kc * Nc * R₂Default()) ≥ K * N) : (firstbytestride(B) ≤ 1600)))
+    elseif (bcache_count() === Zero()) || ((nspawn*(W+W) > M) || (contiguousstride1(B) ? (roundtostaticint(Kc * Nc * R₂Default()) ≥ K * N) : (firstbytestride(B) ≤ 1600)))
         matmulsplitn!(C, A, B, α, β, Mc, M, K, N, nspawn, Val{true}())
     else # TODO: Allow splitting along `N` for `matmul_pack_A_and_B!`
         matmul_pack_A_and_B!(C, A, B, α, β, M, K, N, nspawn, W₁Default(), W₂Default(), R₁Default(), R₂Default())