Preserve the nearbyint implementation and regression coverage while incorporating current main. The write-watch registration prerequisite is now part of main.
Validation: freshly compiled production MathExact.cpp regression passes; ASan/UBSan passes with detect_leaks=0. The same fixture compiles against main Math.cpp and fails at the FE_INEXACT assertion (exit 134). Conventions, whitespace and 235 script registrations pass. Full product build and full CTest were not rerun for this synchronization.
wcstod parsed through the host strtod directly, so a decimal input with
a nonzero subnormal result left errno alone, where strtod sets ERANGE.
The wcstod of the libc.prx bundled with eleven titles sets it in the
same cases as their strtod: 1e-310, the smallest subnormal and 1e-330
set it, 2.2250738585072014e-308 and 0x1p-1074 do not, and 0x1.8p-1075
does. wcstod now parses through strtod.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
The titles' scalbn and scalbnf never set errno, at any exponent. On
Windows the host scalbn already matches, but glibc's scalbn and scalbnf
set ERANGE on overflow and on underflow to zero (found by rooklz while
reviewing #12676), so on Linux they did. Both now keep errno across the
host call, as scalbln and scalblnf already do. CheckScalbnErrno checks
results read from the titles' libc.prx.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
ldexpf called the host ldexp on a float, which computes in double and
sets ERANGE only when the double result leaves the double range, so
ldexpf(0x1.3d1c6p-95f, 1262) set ERANGE while ldexpf(1.0f, 200) did
not. The titles' ldexpf never sets errno, as their scalbnf does not.
ldexpf now computes like scalbnf: on 100,000 random arguments it
matches the libc.prx of PPSA07923 and PPSA05916 in every value and
errno, against 63,957 errno differences before.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
2^-149 and -2^-141 are exact subnormal powf results that raise no flag,
and 3^-90 is an inexact one that raises FE_UNDERFLOW and FE_INEXACT;
none sets errno, as in the libc.prx of PPSA07923 and PPSA13934.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Titles' libc.prx raises FE_INVALID wherever log10 stores EDOM, a NaN
argument included, where (x - x) / zero raised nothing for a NaN
operand. The domain path now raises through _Feraise, which stores EDOM
and raises the flag in both units. For +-0 it now returns -inf without raising FE_DIVBYZERO, as the titles do; the port divided -two54 by zero.
Results and errno are unchanged. CheckLog10EdgeFlags covers it.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
log10 returned the host's log10, whose last bit differs from the titles'
copy on Windows on 3,066,397 of 320 million random arguments. The titles'
copy is the fdlibm e_log10.c over its k_log.h, which FreeBSD 11.4 later
replaced, and it sets EDOM for every nonzero argument with the sign bit set
but leaves errno alone for +-0. log10 now computes that and sets EDOM there.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Titles' libc.prx raises FE_INVALID wherever log2 and log10 stores EDOM, a NaN
argument included, where (x - x) / zero raised nothing for a NaN
operand. The domain path now raises through _Feraise, which stores EDOM
and raises the flag in both units. For +-0 it now returns -inf without raising FE_DIVBYZERO, as the titles do; the port divided -two54 by zero.
Results and errno are unchanged. CheckLog2EdgeFlags and CheckLog10EdgeFlags cover it.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
log2 returned the host's log2, whose last bit differs from the titles' copy
on Windows. The titles' copy is the fdlibm e_log2.c over the same k_log.h
kernel as log10, which FreeBSD 11.4 later replaced, and it sets EDOM for
every nonzero argument with the sign bit set but leaves errno alone for
+-0. log2 now computes that over the kernel, renamed KernelLog because both
functions use it, and sets EDOM there.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
log10 returned the host's log10, whose last bit differs from the titles'
copy on Windows on 3,066,397 of 320 million random arguments. The titles'
copy is the fdlibm e_log10.c over its k_log.h, which FreeBSD 11.4 later
replaced, and it sets EDOM for every nonzero argument with the sign bit set
but leaves errno alone for +-0. log10 now computes that and sets EDOM there.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
powf returns sn * tiny * tiny for an underflowing result, as FreeBSD
msun's e_powf.c does, so that the multiplication raises the underflow
and inexact flags. Math.cpp is built without -frounding-math and tiny
was a local constant, so GCC folded the product to zero at compile time
and no flag was raised; titles' libc.prx raises FE_UNDERFLOW with ERANGE.
Read tiny through a volatile, so the product is computed at run time.
The results and errno are unchanged.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
For a negative integer and -inf, titles' libc.prx returns the x86
default NaN (0xffc00000) from tgammaf, where the host tgamma returns
0x7fc00000. Return the titles' NaN when the result is NaN and the
argument is not; errno and the raised flags are unchanged.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
For |x| > 1, the infinities and NaN, titles' libc.prx stores EDOM and
raises FE_INVALID from acosf, quiet NaN included, and asinf also
raises FE_INVALID for a quiet NaN. acosf returned the same NaN bits
without either, and asinf set errno but raised nothing for a quiet NaN.
Both now call _Feraise with the invalid exception, which stores EDOM
and raises the flag in both units; the results are unchanged.
The acosf test asserted the old errno-preserving behaviour from a
FreeBSD reading; it now checks the titles' EDOM and FE_INVALID.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
The only conflict was in GuestMath.cpp, where main's sinh tests and this
branch's asinh tests were inserted at the same place. Keep both: the asinh
checks follow the sinh ones.
Co-Authored-By: Claude Sonnet 5.5 <[email protected]>
Dean