Make FlushICache NOP for Nvidia Denver CPU's.

src/base/cpu.cc

Index: src/base/cpu.cc
diff --git a/src/base/cpu.cc b/src/base/cpu.cc
index e188406f1a21ff72226b17c2332eb7ccd942dd49..ceacf1f325d2c9a7b4f9fca54b921f99da492ba3 100644
--- a/src/base/cpu.cc
+++ b/src/base/cpu.cc
@@ -300,6 +300,7 @@ CPU::CPU()
       type_(0),
       implementer_(0),
       architecture_(0),
+      variant_(0),

[Benedikt Meurer, 2014/12/19 06:32:09]

The 0 default is not safe as we would default to denver if there is no variant
in cpuinfo, please change it back to -1, sorry for the confusion from my earlier
comment.

[arajp, 2014/12/19 10:45:31]

Done.

       part_(0),
       has_fpu_(false),
       has_cmov_(false),
@@ -396,6 +397,16 @@ CPU::CPU()
     delete[] implementer;
   }
 
+  char* variant = cpu_info.ExtractField("CPU variant");
+  if (variant != NULL) {
+    char* end ;
+    variant_ = strtol(variant, &end, 0);
+    if (end == variant) {
+      variant_ = -1;
+    }
+    delete[] variant;
+  }
+
   // Extract part number from the "CPU part" field.
   char* part = cpu_info.ExtractField("CPU part");
   if (part != NULL) {
@@ -548,6 +559,16 @@ CPU::CPU()
     delete[] implementer;
   }
 
+  char* variant = cpu_info.ExtractField("CPU variant");
+  if (variant != NULL) {
+    char* end ;
+    variant_ = strtol(variant, &end, 0);
+    if (end == variant) {
+      variant_ = -1;
+    }
+    delete[] variant;
+  }
+
   // Extract part number from the "CPU part" field.
   char* part = cpu_info.ExtractField("CPU part");
   if (part != NULL) {