Add running benchmarks regularly and under valgrind in travis

.travis.yml

@@ -11,7 +11,7 @@ compiler:
   - gcc
 env:
   global:
-    - FIELD=auto  BIGNUM=auto  SCALAR=auto  ENDOMORPHISM=no  STATICPRECOMPUTATION=yes  ECMULTGENPRECISION=auto  ASM=no  BUILD=check  EXTRAFLAGS=  HOST=  ECDH=no  RECOVERY=no  EXPERIMENTAL=no CTIMETEST=yes
+    - FIELD=auto  BIGNUM=auto  SCALAR=auto  ENDOMORPHISM=no  STATICPRECOMPUTATION=yes  ECMULTGENPRECISION=auto  ASM=no  BUILD=check  EXTRAFLAGS=  HOST=  ECDH=no  RECOVERY=no  EXPERIMENTAL=no CTIMETEST=yes BENCH=yes SECP256K1_BENCH_ITERS=2
   matrix:
     - SCALAR=32bit    RECOVERY=yes
     - SCALAR=32bit    FIELD=32bit       ECDH=yes  EXPERIMENTAL=yes
@@ -25,7 +25,7 @@ env:
     - BIGNUM=no
     - BIGNUM=no       ENDOMORPHISM=yes RECOVERY=yes EXPERIMENTAL=yes
     - BIGNUM=no       STATICPRECOMPUTATION=no
-    - BUILD=distcheck CTIMETEST=
+    - BUILD=distcheck CTIMETEST= BENCH=
     - EXTRAFLAGS=CPPFLAGS=-DDETERMINISTIC
     - EXTRAFLAGS=CFLAGS=-O0
     - ECMULTGENPRECISION=2
@@ -94,6 +94,12 @@ script:
    travis_wait 30 valgrind --error-exitcode=42 ./tests 16 &&
    travis_wait 30 valgrind --error-exitcode=42 ./exhaustive_tests;
    fi
+ - if [ -n "$BENCH" ]; then
+     if [ -n "$VALGRIND" ]; then EXEC='libtool --mode=execute valgrind --error-exitcode=42'; else EXEC= ; fi &&
+     $EXEC ./bench_ecmult &>> bench.log && $EXEC ./bench_internal &>> bench.log && $EXEC ./bench_sign &>> bench.log && $EXEC ./bench_verify &>> bench.log &&
+     if [ "$RECOVERY" == "yes" ]; then $EXEC ./bench_recover &>> bench.log; fi &&
+     if [ "$ECDH" == "yes" ]; then $EXEC ./bench_ecdh &>> bench.log; fi;
+   fi
  - if [ -n "$CTIMETEST" ]; then
    libtool --mode=execute valgrind  ./valgrind_ctime_test &> valgrind_ctime_test.log;
    fi
@@ -102,3 +108,4 @@ after_script:
     - cat ./tests.log
     - cat ./exhaustive_tests.log
     - cat ./valgrind_ctime_test.log
+    - cat ./bench.log