summaryrefslogtreecommitdiff
path: root/Build/source/libs/gmp/gmp-6.0.0/mpn/x86_64/bd1/README
diff options
context:
space:
mode:
Diffstat (limited to 'Build/source/libs/gmp/gmp-6.0.0/mpn/x86_64/bd1/README')
-rw-r--r--Build/source/libs/gmp/gmp-6.0.0/mpn/x86_64/bd1/README11
1 files changed, 11 insertions, 0 deletions
diff --git a/Build/source/libs/gmp/gmp-6.0.0/mpn/x86_64/bd1/README b/Build/source/libs/gmp/gmp-6.0.0/mpn/x86_64/bd1/README
new file mode 100644
index 00000000000..ccd210e0d6d
--- /dev/null
+++ b/Build/source/libs/gmp/gmp-6.0.0/mpn/x86_64/bd1/README
@@ -0,0 +1,11 @@
+This directory contains code for AMD bulldozer including its piledriver update.
+
+We currently make limited use of SIMD instructions, both via the MPN_PATH and
+via inclusion of x86_64/fastsse files.
+
+The bd1 cores share one SIMD/FPU pipeline for two integer units. This probably
+means that an all-core GMP load (such as a HPC load) might run slower if there
+is significant SIMD dependency.
+
+We should perhaps allow a special 'bd1nosimd' pseudo cpu-name excluding any
+SIMD code.