Piotr Caban : msvcrt: Import log1p implementation from musl.
Alexandre Julliard
julliard at winehq.org
Fri Jun 4 14:32:29 CDT 2021
Module: wine
Branch: master
Commit: 2e6fa0a49804da29e683c72826960a95651ef41e
URL: https://source.winehq.org/git/wine.git/?a=commit;h=2e6fa0a49804da29e683c72826960a95651ef41e
Author: Piotr Caban <piotr at codeweavers.com>
Date: Fri Jun 4 18:25:26 2021 +0200
msvcrt: Import log1p implementation from musl.
Signed-off-by: Piotr Caban <piotr at codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard at winehq.org>
---
configure | 1 -
configure.ac | 1 -
dlls/msvcrt/math.c | 70 ++++++++++++++++++++++++++++++++++++++++++++++++---
dlls/msvcrt/unixlib.c | 13 ----------
dlls/msvcrt/unixlib.h | 1 -
include/config.h.in | 3 ---
6 files changed, 67 insertions(+), 22 deletions(-)
diff --git a/configure b/configure
index 512ced158fa..e91b319c705 100755
--- a/configure
+++ b/configure
@@ -19622,7 +19622,6 @@ for ac_func in \
fmaf \
lgamma \
lgammaf \
- log1p \
log1pf \
log2 \
log2f \
diff --git a/configure.ac b/configure.ac
index 23075b36a42..accdbaf6216 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2661,7 +2661,6 @@ AC_CHECK_FUNCS(\
fmaf \
lgamma \
lgammaf \
- log1p \
log1pf \
log2 \
log2f \
diff --git a/dlls/msvcrt/math.c b/dlls/msvcrt/math.c
index 6e6d80f50a0..fbc97aedce4 100644
--- a/dlls/msvcrt/math.c
+++ b/dlls/msvcrt/math.c
@@ -6898,12 +6898,76 @@ float CDECL expm1f(float x)
/*********************************************************************
* log1p (MSVCR120.@)
+ *
+ * Copied from musl: src/math/log1p.c
*/
double CDECL log1p(double x)
{
- if (x < -1) *_errno() = EDOM;
- else if (x == -1) *_errno() = ERANGE;
- return unix_funcs->log1p( x );
+ static const double ln2_hi = 6.93147180369123816490e-01,
+ ln2_lo = 1.90821492927058770002e-10,
+ Lg1 = 6.666666666666735130e-01,
+ Lg2 = 3.999999999940941908e-01,
+ Lg3 = 2.857142874366239149e-01,
+ Lg4 = 2.222219843214978396e-01,
+ Lg5 = 1.818357216161805012e-01,
+ Lg6 = 1.531383769920937332e-01,
+ Lg7 = 1.479819860511658591e-01;
+
+ union {double f; UINT64 i;} u = {x};
+ double hfsq, f, c, s, z, R, w, t1, t2, dk;
+ UINT32 hx, hu;
+ int k;
+
+ hx = u.i >> 32;
+ k = 1;
+ if (hx < 0x3fda827a || hx >> 31) { /* 1+x < sqrt(2)+ */
+ if (hx >= 0xbff00000) { /* x <= -1.0 */
+ if (x == -1) {
+ *_errno() = ERANGE;
+ return x / 0.0; /* og1p(-1) = -inf */
+ }
+ *_errno() = EDOM;
+ return (x-x) / 0.0; /* log1p(x<-1) = NaN */
+ }
+ if (hx << 1 < 0x3ca00000 << 1) { /* |x| < 2**-53 */
+ fp_barrier(x + 0x1p120f);
+ /* underflow if subnormal */
+ if ((hx & 0x7ff00000) == 0)
+ fp_barrierf(x);
+ return x;
+ }
+ if (hx <= 0xbfd2bec4) { /* sqrt(2)/2- <= 1+x < sqrt(2)+ */
+ k = 0;
+ c = 0;
+ f = x;
+ }
+ } else if (hx >= 0x7ff00000)
+ return x;
+ if (k) {
+ u.f = 1 + x;
+ hu = u.i >> 32;
+ hu += 0x3ff00000 - 0x3fe6a09e;
+ k = (int)(hu >> 20) - 0x3ff;
+ /* correction term ~ log(1+x)-log(u), avoid underflow in c/u */
+ if (k < 54) {
+ c = k >= 2 ? 1 - (u.f - x) : x - (u.f - 1);
+ c /= u.f;
+ } else
+ c = 0;
+ /* reduce u into [sqrt(2)/2, sqrt(2)] */
+ hu = (hu & 0x000fffff) + 0x3fe6a09e;
+ u.i = (UINT64)hu << 32 | (u.i & 0xffffffff);
+ f = u.f - 1;
+ }
+ hfsq = 0.5 * f * f;
+ s = f / (2.0 + f);
+ z = s * s;
+ w = z * z;
+ t1 = w * (Lg2 + w * (Lg4 + w * Lg6));
+ t2 = z * (Lg1 + w * (Lg3 + w * (Lg5 + w * Lg7)));
+ R = t2 + t1;
+ dk = k;
+ return s * (hfsq + R) + (dk * ln2_lo + c) - hfsq + f + dk * ln2_hi;
}
/*********************************************************************
diff --git a/dlls/msvcrt/unixlib.c b/dlls/msvcrt/unixlib.c
index c880bcda8e2..f98d08e4909 100644
--- a/dlls/msvcrt/unixlib.c
+++ b/dlls/msvcrt/unixlib.c
@@ -136,18 +136,6 @@ static float CDECL unix_log10f( float x )
return log10f( x );
}
-/*********************************************************************
- * log1p
- */
-static double CDECL unix_log1p(double x)
-{
-#ifdef HAVE_LOG1P
- return log1p(x);
-#else
- return log(1 + x);
-#endif
-}
-
/*********************************************************************
* log1pf
*/
@@ -237,7 +225,6 @@ static const struct unix_funcs funcs =
unix_lgammaf,
unix_log10,
unix_log10f,
- unix_log1p,
unix_log1pf,
unix_log2,
unix_log2f,
diff --git a/dlls/msvcrt/unixlib.h b/dlls/msvcrt/unixlib.h
index bbec27c1061..285deb22bc2 100644
--- a/dlls/msvcrt/unixlib.h
+++ b/dlls/msvcrt/unixlib.h
@@ -32,7 +32,6 @@ struct unix_funcs
float (CDECL *lgammaf)(float x);
double (CDECL *log10)(double x);
float (CDECL *log10f)(float x);
- double (CDECL *log1p)(double x);
float (CDECL *log1pf)(float x);
double (CDECL *log2)(double x);
float (CDECL *log2f)(float x);
diff --git a/include/config.h.in b/include/config.h.in
index 3d1e5e6ca5a..7e6d36112d3 100644
--- a/include/config.h.in
+++ b/include/config.h.in
@@ -408,9 +408,6 @@
/* Define to 1 if you have the <linux/videodev2.h> header file. */
#undef HAVE_LINUX_VIDEODEV2_H
-/* Define to 1 if you have the `log1p' function. */
-#undef HAVE_LOG1P
-
/* Define to 1 if you have the `log1pf' function. */
#undef HAVE_LOG1PF
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