remainder, remainderf, remquo and remquof returned the host's functions.
The titles' copies are FreeBSD's amd64 e_remainder.S and s_remquo.S: an
x87 fprem1 loop whose remquo quotient is the sign and the three low bits
from C0, C3 and C1, and whose NaN results follow x87 NaN selection. Sony's
wrapper sets EDOM for a zero divisor or an infinite dividend when neither
argument is a NaN. All four now run that loop and set that errno.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
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.
exp returned the host's exp, whose last bit differs from the titles' copy on
Windows on 9,892,285 of 320 million random arguments. The titles' copy is
FreeBSD msun's e_exp.c, except that exp(1) returns the correctly rounded e,
and it sets ERANGE only in msun's overflow and underflow branches. exp now
computes that and sets ERANGE there.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
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]>
The pow of the libc.prx that titles ship (PPSA07923) multiplies |x| by
2^53 for its subnormal normalization on every general-path call and
keeps the product only for subnormal x. For |x| from 2^971 up the
unused product overflows, so pow raises FE_OVERFLOW there for any
exponent that reaches the general path, even when the result is
finite (pow(1e300, -0.25)). The product is now computed the same way;
it is exact below 2^971, so only that flag changes.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Dean