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m4: bump for improved vectorisation and devirtualisation

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This commit is contained in:
Danny Robson 2015-09-10 14:40:18 +10:00
parent e829e95791
commit da122bfb00
2 changed files with 19 additions and 12 deletions
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1
m4/nc_cxx.m4
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@ -23,4 +23,5 @@ AC_DEFUN([NC_CXX],[
[])],
[], [AC_DEFINE([final], [], [Pretend about final keyword support])])
AX_APPEND_COMPILE_FLAGS([-fvisibility=hidden], [], [-Werror])
])

30
m4/nc_optimisation.m4
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@ -54,6 +54,8 @@ AC_DEFUN([NC_OPTIMISATION],[
)
AX_APPEND_COMPILE_FLAGS([-pipe])
# base instruction set requirements for x86
AX_APPEND_COMPILE_FLAGS([-mfpmath=sse], [], [-Werror])
AX_APPEND_COMPILE_FLAGS([-msahf], [], [-Werror])
@ -61,30 +63,34 @@ AC_DEFUN([NC_OPTIMISATION],[
## Enable aggressive code generation optimisations
AS_IF([test "x$enable_debugging" != "xyes"], [
AX_APPEND_COMPILE_FLAGS([-ftree-loop-distribute-patterns], [], [-Werror])
AX_APPEND_COMPILE_FLAGS([-ftree-loop-if-convert-stores], [], [-Werror])
# gcc vectorisation
AX_APPEND_COMPILE_FLAGS([-ftree-vectorize], [], [-Werror])
AX_APPEND_COMPILE_FLAGS([-funsafe-loop-optimizations], [], [-Werror])
# gcc >= 4.8 defaults to enabling stack-protector, we care more about
# performance than security.
AX_APPEND_COMPILE_FLAGS([-fno-stack-protector], [], [-Werror])
AX_APPEND_COMPILE_FLAGS([-ftree-loop-linear], [], [-Werror])
AX_APPEND_COMPILE_FLAGS([-floop-interchange], [], [-Werror])
# clang vectorisation
AX_APPEND_COMPILE_FLAGS([-fvectorize], [], [-Werror])
AX_APPEND_COMPILE_FLAGS([-fslp-vectorize], [], [-Werror])
AX_APPEND_COMPILE_FLAGS([-fslp-vectorize-aggressive], [], [-Werror])
# loop hosting/distribution
AX_APPEND_COMPILE_FLAGS([-ftree-loop-distribute-patterns], [], [-Werror])
AX_APPEND_COMPILE_FLAGS([-ftree-loop-distribution], [], [-Werror])
AX_APPEND_COMPILE_FLAGS([-ftree-loop-distribute-patterns], [], [-Werror])
AX_APPEND_COMPILE_FLAGS([-ftree-vectorize], [], [-Werror])
AX_APPEND_COMPILE_FLAGS([-ftree-loop-if-convert-stores], [], [-Werror])
AX_APPEND_COMPILE_FLAGS([-ftree-loop-linear], [], [-Werror])
AX_APPEND_COMPILE_FLAGS([-funsafe-loop-optimizations], [], [-Werror])
AX_APPEND_COMPILE_FLAGS([-floop-interchange], [], [-Werror])
# safety removal for performance
AX_APPEND_COMPILE_FLAGS([-fno-stack-protector], [], [-Werror])
])
##-------------------------------------------------------------------------
## Enable code size optimisations (that don't impact performance)
## Note: we assume CXX, and that CXXLINK is g++ not ld, hence the -Wl opt
AS_IF([test "x$enable_debugging" != "xyes"], [
AX_APPEND_COMPILE_FLAGS([-fdevirtualize], [], [-Werror])
AX_APPEND_COMPILE_FLAGS([-fdevirtualize-speculatively], [], [-Werror])
AX_CHECK_LINK_FLAG([-Wl,--gc-sections], [
AX_APPEND_COMPILE_FLAGS([-fdata-sections], [], [-Werror])
AX_APPEND_COMPILE_FLAGS([-ffunction-sections], [], [-Werror])