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c156098271
Based on code from https://github.com/ARM-software/optimized-routines/ This patch adds a highly optimized generic implementation of expf, exp2f, logf, log2f and powf. The new functions are not only faster (6x for powf!), but are also smaller and more accurate. In order to achieve this, the algorithm uses double precision arithmetic for accuracy, avoids divisions and uses small table lookups to minimize the polynomials. Special cases are handled inline to avoid the unnecessary overhead of wrapper functions and set errno to POSIX requirements. The new functions are added under newlib/libm/common, but the old implementations are kept (in newlib/libm/math) for non-IEEE or pre-C99 systems. Targets can enable the new math code by defining __OBSOLETE_MATH_DEFAULT to 0 in newlib/libc/include/machine/ieeefp.h, users can override the default by defining __OBSOLETE_MATH. Currently the new code is enabled for AArch64 and AArch32 with VFP. Targets with a single precision FPU may still prefer the old implementation. libm.a size changes: arm: -1692 arm/thumb/v7-a/nofp: -878 arm/thumb/v7-a+fp/hard: -864 arm/thumb/v7-a+fp/softfp: -908 aarch64: -1476
85 lines
2.4 KiB
Makefile
85 lines
2.4 KiB
Makefile
## Process this file with automake to generate Makefile.in
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AUTOMAKE_OPTIONS = cygnus
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INCLUDES = -I$(srcdir)/../common $(NEWLIB_CFLAGS) $(CROSS_CFLAGS) $(TARGET_CFLAGS)
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src = k_standard.c k_rem_pio2.c \
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k_cos.c k_sin.c k_tan.c \
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e_acos.c e_acosh.c e_asin.c e_atan2.c \
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e_atanh.c e_cosh.c e_exp.c e_fmod.c \
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er_gamma.c e_hypot.c e_j0.c \
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e_j1.c e_jn.c er_lgamma.c \
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e_log.c e_log10.c e_pow.c e_rem_pio2.c e_remainder.c \
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e_scalb.c e_sinh.c e_sqrt.c \
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w_acos.c w_acosh.c w_asin.c w_atan2.c \
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w_atanh.c w_cosh.c w_exp.c w_fmod.c \
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w_gamma.c wr_gamma.c w_hypot.c w_j0.c \
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w_j1.c w_jn.c w_lgamma.c wr_lgamma.c \
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w_log.c w_log10.c w_pow.c w_remainder.c \
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w_scalb.c w_sinh.c w_sqrt.c \
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w_sincos.c \
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w_drem.c \
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s_asinh.c s_atan.c s_ceil.c \
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s_cos.c s_erf.c s_fabs.c s_floor.c \
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s_frexp.c s_ldexp.c \
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s_signif.c s_sin.c \
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s_tan.c s_tanh.c \
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w_exp2.c w_tgamma.c
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fsrc = kf_rem_pio2.c \
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kf_cos.c kf_sin.c kf_tan.c \
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ef_acos.c ef_acosh.c ef_asin.c ef_atan2.c \
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ef_atanh.c ef_cosh.c ef_exp.c ef_fmod.c \
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erf_gamma.c ef_hypot.c ef_j0.c \
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ef_j1.c ef_jn.c erf_lgamma.c \
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ef_log.c ef_log10.c ef_pow.c ef_rem_pio2.c ef_remainder.c \
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ef_scalb.c ef_sinh.c ef_sqrt.c \
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wf_acos.c wf_acosh.c wf_asin.c wf_atan2.c \
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wf_atanh.c wf_cosh.c wf_exp.c wf_fmod.c \
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wf_gamma.c wrf_gamma.c wf_hypot.c wf_j0.c \
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wf_j1.c wf_jn.c wf_lgamma.c wrf_lgamma.c \
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wf_log.c wf_log10.c wf_pow.c wf_remainder.c \
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wf_scalb.c wf_sinh.c wf_sqrt.c \
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wf_sincos.c \
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wf_drem.c \
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sf_asinh.c sf_atan.c sf_ceil.c \
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sf_cos.c sf_erf.c sf_fabs.c sf_floor.c \
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sf_frexp.c sf_ldexp.c \
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sf_signif.c sf_sin.c \
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sf_tan.c sf_tanh.c \
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wf_exp2.c wf_tgamma.c \
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wf_log2.c
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lsrc = el_hypot.c
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libmath_la_LDFLAGS = -Xcompiler -nostdlib
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if USE_LIBTOOL
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noinst_LTLIBRARIES = libmath.la
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libmath_la_SOURCES = $(src) $(fsrc) $(lsrc)
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noinst_DATA = objectlist.awk.in
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else
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noinst_LIBRARIES = lib.a
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lib_a_SOURCES = $(src) $(fsrc) $(lsrc)
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lib_a_CFLAGS = $(AM_CFLAGS)
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noinst_DATA =
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endif # USE_LIBTOOL
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include $(srcdir)/../../Makefile.shared
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CHEWOUT_FILES = w_acos.def w_acosh.def w_asin.def s_asinh.def \
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s_atan.def w_atan2.def w_atanh.def w_j0.def \
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w_cosh.def s_erf.def w_exp.def w_exp2.def \
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s_fabs.def s_floor.def w_fmod.def s_frexp.def \
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w_gamma.def w_hypot.def s_ldexp.def w_log.def \
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w_log10.def \
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w_pow.def w_remainder.def s_sin.def w_sinh.def \
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w_sqrt.def s_tan.def s_tanh.def
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CHAPTERS = math.tex
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# A partial dependency list.
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$(lib_a_OBJECTS): $(srcdir)/../../libc/include/math.h $(srcdir)/../common/fdlibm.h
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