The attached two patches are an updated version of this patch sent in June: https://gcc.gnu.org/ml/gcc-patches/2015-06/msg00123.html "[PATCH 02/16] gcc: Embed the driver in-process within libgccjit"
(an updated version of [patch 01/16] from that kit is in trunk as of r226530; https://gcc.gnu.org/ml/gcc-patches/2015-07/msg02713.html) They provide a modest speedup of jit.dg/test-benchmark.c and hence are useful in their own right: Median time taken for 100 in-process compiles (lower is better) over multiple runs, showing mean within each run: Control build of r226530, with pex-execution of driver binary: optlevel 0: 6.210s (0.062s per iteration) optlevel 1: 6.990s (0.070s per iteration) optlevel 2: 7.240s (0.072s per iteration) optlevel 3: 9.010s (0.090s per iteration) With these patches, embedding the driver: optlevel 0: 6.020s (0.060s per iteration) optlevel 1: 6.720s (0.067s per iteration) optlevel 2: 7.020s (0.070s per iteration) optlevel 3: 8.660s (0.087s per iteration) They are also a prerequisite for some of the much larger speedups proposed in the followup patches sent in June. I've split them out into the driver part (patch 1) and the jit-specific part (patch 2) for ease of review. Successfully bootstrapped and regression-tested the combination of the two patches on x86_64-pc-linux-gnu. OK for trunk? David Malcolm (2): driver: support state cleanup jit: use an embedded copy of the driver gcc/gcc-main.c | 3 +- gcc/gcc.c | 400 +++++++++++++++++++-- gcc/gcc.h | 3 + gcc/jit/docs/cp/topics/contexts.rst | 20 ++ .../docs/internals/test-hello-world.exe.log.txt | 6 +- gcc/jit/docs/topics/compatibility.rst | 7 + gcc/jit/docs/topics/contexts.rst | 20 ++ gcc/jit/jit-common.h | 1 + gcc/jit/jit-playback.c | 52 ++- gcc/jit/jit-playback.h | 14 + gcc/jit/jit-recording.c | 3 +- gcc/jit/libgccjit++.h | 8 + gcc/jit/libgccjit.c | 17 + gcc/jit/libgccjit.h | 24 ++ gcc/jit/libgccjit.map | 5 + gcc/jit/notes.txt | 8 +- .../jit.dg/test-error-pr63969-missing-driver.c | 4 + 17 files changed, 561 insertions(+), 34 deletions(-) -- 1.8.5.3
