[Bug middle-end/14840] fold tree_code_type[CST] and tree_code_length[CST] in GCC itself

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=14840

--- Comment #14 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Compile time using the same base compiler (without the patch and with
--enable-checking=yes)

Without the patch:
apinski@xeond:~/src/upstream-gcc/gcc/objdir/gcc$ time make -j16 generic-match.o
CXXFLAGS="-O2 -g"
/home/apinski/src/upstream-gcc/gcc/objdir/./prev-gcc/xg++
-B/home/apinski/src/upstream-gcc/gcc/objdir/./prev-gcc/
-B/home/apinski/upstream-gcc/x86_64-pc-linux-gnu/bin/ -nostdinc++
-B/home/apinski/src/upstream-gcc/gcc/objdir/prev-x86_64-pc-linux-gnu/libstdc++-v3/src/.libs
-B/home/apinski/src/upstream-gcc/gcc/objdir/prev-x86_64-pc-linux-gnu/libstdc++-v3/libsupc++/.libs

-I/home/apinski/src/upstream-gcc/gcc/objdir/prev-x86_64-pc-linux-gnu/libstdc++-v3/include/x86_64-pc-linux-gnu

-I/home/apinski/src/upstream-gcc/gcc/objdir/prev-x86_64-pc-linux-gnu/libstdc++-v3/include
 -I/home/apinski/src/upstream-gcc/gcc/libstdc++-v3/libsupc++
-L/home/apinski/src/upstream-gcc/gcc/objdir/prev-x86_64-pc-linux-gnu/libstdc++-v3/src/.libs
-L/home/apinski/src/upstream-gcc/gcc/objdir/prev-x86_64-pc-linux-gnu/libstdc++-v3/libsupc++/.libs
 -fno-PIE -c   -O2 -g -DIN_GCC     -fno-exceptions -fno-rtti
-fasynchronous-unwind-tables -W -Wall -Wno-narrowing -Wwrite-strings
-Wcast-qual -Wmissing-format-attribute -Woverloaded-virtual -pedantic
-Wno-long-long -Wno-variadic-macros -Wno-overlength-strings -Werror -fno-common
-Wno-unused -DHAVE_CONFIG_H -I. -I. -I/home/apinski/src/upstream-gcc/gcc/gcc
-I/home/apinski/src/upstream-gcc/gcc/gcc/.
-I/home/apinski/src/upstream-gcc/gcc/gcc/../include
-I/home/apinski/src/upstream-gcc/gcc/gcc/../libcpp/include
-I/home/apinski/src/upstream-gcc/gcc/gcc/../libcody
-I/home/apinski/src/upstream-gcc/gcc/objdir/./gmp
-I/home/apinski/src/upstream-gcc/gcc/gmp
-I/home/apinski/src/upstream-gcc/gcc/objdir/./mpfr/src
-I/home/apinski/src/upstream-gcc/gcc/mpfr/src
-I/home/apinski/src/upstream-gcc/gcc/mpc/src 
-I/home/apinski/src/upstream-gcc/gcc/gcc/../libdecnumber
-I/home/apinski/src/upstream-gcc/gcc/gcc/../libdecnumber/bid -I../libdecnumber
-I/home/apinski/src/upstream-gcc/gcc/gcc/../libbacktrace
-I/home/apinski/src/upstream-gcc/gcc/objdir/./isl/include
-I/home/apinski/src/upstream-gcc/gcc/isl/include  -o generic-match.o -MT
generic-match.o -MMD -MP -MF ./.deps/generic-match.TPo generic-match.cc

real    1m48.703s
user    1m47.137s
sys     0m1.458s


with the patch:
apinski@xeond:~/src/upstream-gcc/gcc/objdir/gcc$ time make -j16 generic-match.o
CXXFLAGS="-O2 -g"
/home/apinski/src/upstream-gcc/gcc/objdir/./prev-gcc/xg++
-B/home/apinski/src/upstream-gcc/gcc/objdir/./prev-gcc/
-B/home/apinski/upstream-gcc/x86_64-pc-linux-gnu/bin/ -nostdinc++
-B/home/apinski/src/upstream-gcc/gcc/objdir/prev-x86_64-pc-linux-gnu/libstdc++-v3/src/.libs
-B/home/apinski/src/upstream-gcc/gcc/objdir/prev-x86_64-pc-linux-gnu/libstdc++-v3/libsupc++/.libs

-I/home/apinski/src/upstream-gcc/gcc/objdir/prev-x86_64-pc-linux-gnu/libstdc++-v3/include/x86_64-pc-linux-gnu

-I/home/apinski/src/upstream-gcc/gcc/objdir/prev-x86_64-pc-linux-gnu/libstdc++-v3/include
 -I/home/apinski/src/upstream-gcc/gcc/libstdc++-v3/libsupc++
-L/home/apinski/src/upstream-gcc/gcc/objdir/prev-x86_64-pc-linux-gnu/libstdc++-v3/src/.libs
-L/home/apinski/src/upstream-gcc/gcc/objdir/prev-x86_64-pc-linux-gnu/libstdc++-v3/libsupc++/.libs
 -fno-PIE -c   -O2 -g -DIN_GCC     -fno-exceptions -fno-rtti
-fasynchronous-unwind-tables -W -Wall -Wno-narrowing -Wwrite-strings
-Wcast-qual -Wmissing-format-attribute -Woverloaded-virtual -pedantic
-Wno-long-long -Wno-variadic-macros -Wno-overlength-strings -Werror -fno-common
-Wno-unused -DHAVE_CONFIG_H -I. -I. -I/home/apinski/src/upstream-gcc/gcc/gcc
-I/home/apinski/src/upstream-gcc/gcc/gcc/.
-I/home/apinski/src/upstream-gcc/gcc/gcc/../include
-I/home/apinski/src/upstream-gcc/gcc/gcc/../libcpp/include
-I/home/apinski/src/upstream-gcc/gcc/gcc/../libcody
-I/home/apinski/src/upstream-gcc/gcc/objdir/./gmp
-I/home/apinski/src/upstream-gcc/gcc/gmp
-I/home/apinski/src/upstream-gcc/gcc/objdir/./mpfr/src
-I/home/apinski/src/upstream-gcc/gcc/mpfr/src
-I/home/apinski/src/upstream-gcc/gcc/mpc/src 
-I/home/apinski/src/upstream-gcc/gcc/gcc/../libdecnumber
-I/home/apinski/src/upstream-gcc/gcc/gcc/../libdecnumber/bid -I../libdecnumber
-I/home/apinski/src/upstream-gcc/gcc/gcc/../libbacktrace
-I/home/apinski/src/upstream-gcc/gcc/objdir/./isl/include
-I/home/apinski/src/upstream-gcc/gcc/isl/include  -o generic-match.o -MT
generic-match.o -MMD -MP -MF ./.deps/generic-match.TPo generic-match.cc

real    1m41.673s
user    1m39.165s
sys     0m1.462s

So slightly faster (~7%). I wonder if it is because there is less debug info
produced. 

generic-match.cc is the best case of what this can do really.