GNU C Library master sources branch hjl/x86/optimize updated. glibc-2.25-311-g1127eac

[hjl at sourceware dot org]

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The branch, hjl/x86/optimize has been updated
       via  1127eac3db2f2b2c25e4fe82622294b150bc8858 (commit)
      from  a1235ffcf2833b5eda1d86f1a99c4f0fe084cc8b (commit)

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- Log -----------------------------------------------------------------
http://sourceware.org/git/gitweb.cgi?p=glibc.git;a=commitdiff;h=1127eac3db2f2b2c25e4fe82622294b150bc8858

commit 1127eac3db2f2b2c25e4fe82622294b150bc8858
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Thu May 11 09:01:15 2017 -0700

    Print alignments of source and destination

diff --git a/benchtests/memcpy_benchmark.cc b/benchtests/memcpy_benchmark.cc
index 979373c..e92f6af 100644
--- a/benchtests/memcpy_benchmark.cc
+++ b/benchtests/memcpy_benchmark.cc
@@ -35,6 +35,9 @@ std::chrono::time_point<std::chrono::high_resolution_clock> start;
 std::chrono::time_point<std::chrono::high_resolution_clock> stop;
 size_t bytes;
 
+#define MAX_ALIGN 128
+uintptr_t src_align, dest_align;
+
 void start_timing() { start = std::chrono::high_resolution_clock::now(); }
 void stop_timing() { stop = std::chrono::high_resolution_clock::now(); }
 
@@ -46,6 +49,9 @@ void BM_memcpy_readwritecache(impl_t *impl, int iters, int size) {
   unsigned char * buf1 = new unsigned char [size];
   unsigned char * buf2 = new unsigned char [size];
 
+  src_align  = ((uintptr_t) buf1) & (MAX_ALIGN - 1);
+  dest_align  = ((uintptr_t) buf2) & (MAX_ALIGN - 1);
+
   memset (buf1, 0xa5, size); memset (buf2, 0x5a, size);
 
   start_timing();
@@ -61,6 +67,9 @@ void BM_memcpy_nocache(impl_t *impl, int iters, int size) {
   unsigned char * buf1 = new unsigned char [buffer_size];
   unsigned char * buf2 = new unsigned char [buffer_size];
 
+  src_align  = ((uintptr_t) buf1) & (MAX_ALIGN - 1);
+  dest_align  = ((uintptr_t) buf2) & (MAX_ALIGN - 1);
+
   memset (buf1, 0xa5, buffer_size); memset (buf2, 0x5a, buffer_size);
 
   size_t offset = 0;
@@ -79,6 +88,9 @@ void BM_memcpy_readcache(impl_t *impl, int iters, int size) {
   unsigned char * buf1 = new unsigned char [size];
   unsigned char * buf2 = new unsigned char [buffer_size];
 
+  src_align  = ((uintptr_t) buf1) & (MAX_ALIGN - 1);
+  dest_align  = ((uintptr_t) buf2) & (MAX_ALIGN - 1);
+
   memset (buf1, 0xa5, size); memset (buf2, 0x5a, buffer_size);
 
   size_t offset = 0;
@@ -110,12 +122,14 @@ std::map<std::string, std::function<void(impl_t *, int, int)>> schemes =
    {"Read Cache", BM_memcpy_readcache}};
 
 void test(impl_t *impl) {
-  std::cout << "      Size (bytes) Time (msec) BW (Gbytes/sec)" << std::endl;
+  std::cout << "      Size (bytes) Alignment (src/dest) Time (msec) BW (Gbytes/sec)" << std::endl;
   for (auto scheme : schemes) {
     std::cout << scheme.first << std::endl;
     for (auto size : size_list) {
       int time = do_timing(scheme.second, impl, size);
-      printf("%12d %10d %10.2f\n", size, time, (bytes * 1000L / time) / 1e9);
+      printf("%12d %15d/%-7d %10d %10.2f\n",
+	     size, src_align, dest_align, time,
+	     (bytes * 1000L / time) / 1e9);
     }
     std::cout << "----------------\n";
   }

-----------------------------------------------------------------------

Summary of changes:
 benchtests/memcpy_benchmark.cc |   18 ++++++++++++++++--
 1 files changed, 16 insertions(+), 2 deletions(-)


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