commit 1873560a5b49434905d52460532c7fcce9b7e6de
author Jim Stichnoth <stichnot@chromium.org> Tue Sep 16 19:59:35 2014 -0700
committer Jim Stichnoth <stichnot@chromium.org> Tue Sep 16 19:59:35 2014 -0700
tree 10fbfa0509d8b0cfd6e698be676802c229d31615
parent bc004630f011e69deeca08428e59e15a4a602c1e

Subzero: Add rudimentary statistics on generated code.

The following are collected:
- Number of machine instructions emitted
- Number of registers saved/restored in prolog/epilog
- Number of stack frame bytes (non-alloca) allocated
- Number of "spills", or stores to stack slots
- Number of "fills", or loads/operations from stack slots
- Fill+Spill count (sum of above two)

These are somewhat reasonable approximations of code quality, and the primary intention is to compare before-and-after when trying out an optimization.

The statistics are dumped after translating each function.  Per-function and cumulative statistics are collected.  The output lines have a prefix that is easy to filter.

BUG= none
R=jvoung@chromium.org

Review URL: https://codereview.chromium.org/580633002

src/IceTranslator.cpp

diff --git a/src/IceTranslator.cpp b/src/IceTranslator.cpp
index 05332b4..0636b50 100644
--- a/src/IceTranslator.cpp
+++ b/src/IceTranslator.cpp
@@ -71,6 +71,7 @@
 }
 
 void Translator::translateFcn(Cfg *Fcn) {
+  Ctx->resetStats();
   Func.reset(Fcn);
   if (Ctx->getFlags().DisableInternal)
     Func->setInternal(false);
@@ -95,6 +96,7 @@
       std::cerr << "[Subzero timing] Emit function " << Func->getFunctionName()
                 << ": " << TEmit.getElapsedSec() << " sec\n";
     }
+    Ctx->dumpStats(Func->getFunctionName());
   }
 }