msvcrt: Fix logf implementation.

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=51222Signed-off-by: Piotr Caban <piotr@codeweavers.com> Signed-off-by: Alexandre Julliard <julliard@winehq.org>

msvcrt: Fix logf implementation.
673815e0 · Piotr Caban · Alexandre Julliard · 4522c54a · 673815e0
Commit 673815e0 authored Jun 07, 2021 by Piotr Caban Committed by Alexandre Julliard Jun 07, 2021
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math.c dlls/msvcrt/math.c +3 -3

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--- a/dlls/msvcrt/math.c
+++ b/dlls/msvcrt/math.c
@@ -1254,7 +1254,7 @@ float CDECL logf( float x )
    if (ix - 0x00800000 >= 0x7f800000 - 0x00800000) {
        /* x < 0x1p-126 or inf or nan. */
        if (ix * 2 == 0)
-            return math_error(_SING, "logf", x, 0, -1.0 / x);
+            return math_error(_SING, "logf", x, 0, (ix & 0x80000000 ? 1.0 : -1.0) / x);
        if (ix == 0x7f800000) /* log(inf) == inf. */
            return x;
        if (ix * 2 > 0xff000000)
@@ -1273,7 +1273,7 @@ float CDECL logf( float x )
    tmp = ix - 0x3f330000;
    i = (tmp >> (23 - 4)) % (1 << 4);
    k = (INT32)tmp >> 23; /* arithmetic shift */
-    iz = ix - (tmp & 0xff << 23);
+    iz = ix - (tmp & (0x1ffu << 23));
    invc = T[i].invc;
    logc = T[i].logc;
    z = *(float*)&iz;
@@ -2966,7 +2966,7 @@ double CDECL log( double x )
    if (top - 0x0010 >= 0x7ff0 - 0x0010) {
        /* x < 0x1p-1022 or inf or nan. */
        if (ix * 2 == 0)
-            return math_error(_SING, "log", x, 0, -1.0 / x);
+            return math_error(_SING, "log", x, 0, (top & 0x8000 ? 1.0 : -1.0) / x);
        if (ix == 0x7ff0000000000000ULL) /* log(inf) == inf. */
            return x;
        if ((top & 0x7ff0) == 0x7ff0 && (ix & 0xfffffffffffffULL))