[PATCH v4 0/1] MR8242: libs/musl: Force built-in rint for i386.

[Daniel Lehman (＠dlehman25)]

https://gitlab.winehq.org/wine/wine/-/merge_requests/7748#note_105461

huge thanks to @bernhardu for narrowing it down.  does this work for you?

--
  v4: dlls/msvcrt: Move rint implementation to bundled musl library.

https://gitlab.winehq.org/wine/wine/-/merge_requests/8242

[PATCH v4 1/1] dlls/msvcrt: Move rint implementation to bundled musl library.

[Daniel Lehman]

From: Daniel Lehman

---
 dlls/msvcr120/msvcr120.spec |  4 ++--
 dlls/msvcrt/math.c          | 23 +++--------------------
 dlls/ntdll/math.c           |  5 +++++
 dlls/ucrtbase/ucrtbase.spec |  8 ++++----
 libs/musl/src/math/rint.c   |  6 ++++++
 5 files changed, 20 insertions(+), 26 deletions(-)

diff --git a/dlls/msvcr120/msvcr120.spec b/dlls/msvcr120/msvcr120.spec
index 56b26852ce1..4305bc7bada 100644
--- a/dlls/msvcr120/msvcr120.spec
+++ b/dlls/msvcr120/msvcr120.spec
@@ -2334,9 +2334,9 @@
 @ cdecl remquol(double double ptr) remquo
 @ cdecl rename(str str)
 @ cdecl rewind(ptr)
-@ cdecl rint(double) MSVCRT_rint
+@ cdecl rint(double)
 @ cdecl rintf(float)
-@ cdecl rintl(double) MSVCRT_rint
+@ cdecl rintl(double) rint
 @ cdecl round(double)
 @ cdecl roundf(float)
 @ cdecl roundl(double) round
diff --git a/dlls/msvcrt/math.c b/dlls/msvcrt/math.c
index 682010e3aa5..512fe503fe0 100644
--- a/dlls/msvcrt/math.c
+++ b/dlls/msvcrt/math.c
@@ -1621,23 +1621,6 @@ int CDECL _isnan(double num)

#if _MSVCR_VER>=120

-/*********************************************************************
- *      rint (MSVCR120.@)
- */
-double CDECL MSVCRT_rint(double x)
-{
-    unsigned cw;
-    double y;
-
-    cw = _controlfp(0, 0);
-    if ((cw & _MCW_PC) != _PC_53)
-        _controlfp(_PC_53, _MCW_PC);
-    y = rint(x);
-    if ((cw & _MCW_PC) != _PC_53)
-        _controlfp(cw, _MCW_PC);
-    return y;
-}
-
 /*********************************************************************
  *		_nearbyint (MSVCR120.@)
  *
@@ -1656,7 +1639,7 @@ double CDECL nearbyint(double x)
         cw |= _EM_INEXACT;
         _setfp(&cw, _EM_INEXACT, NULL, 0);
     }
-    x = MSVCRT_rint(x);
+    x = rint(x);
     if (update_cw || update_sw)
     {
         sw = 0;
@@ -2603,7 +2586,7 @@ __msvcrt_long CDECL lrint(double x)
 {
     double d;

-    d = MSVCRT_rint(x);
+    d = rint(x);
     if ((d < 0 && d != (double)(__msvcrt_long)d)
             || (d >= 0 && d != (double)(__msvcrt_ulong)d)) {
         *_errno() = EDOM;
@@ -2635,7 +2618,7 @@ __int64 CDECL llrint(double x)
 {
     double d;

-    d = MSVCRT_rint(x);
+    d = rint(x);
     if ((d < 0 && d != (double)(__int64)d)
             || (d >= 0 && d != (double)(unsigned __int64)d)) {
         *_errno() = EDOM;
diff --git a/dlls/ntdll/math.c b/dlls/ntdll/math.c
index 73a5bb8cd33..57455088747 100644
--- a/dlls/ntdll/math.c
+++ b/dlls/ntdll/math.c
@@ -30,6 +30,11 @@ double math_error( int type, const char *name, double arg1, double arg2, double
     return retval;
 }

+unsigned int _controlfp(unsigned int, unsigned int)
+{
+    return 0;
+}
+
 /*********************************************************************
  *                  abs   (NTDLL.@)
  */
diff --git a/dlls/ucrtbase/ucrtbase.spec b/dlls/ucrtbase/ucrtbase.spec
index 230f5ceb1d7..9f026b351d1 100644
--- a/dlls/ucrtbase/ucrtbase.spec
+++ b/dlls/ucrtbase/ucrtbase.spec
@@ -1758,9 +1758,9 @@
 @ cdecl _o_remquol(double double ptr) remquo
 @ cdecl _o_rename(str str) rename
 @ cdecl _o_rewind(ptr) rewind
-@ cdecl _o_rint(double) MSVCRT_rint
+@ cdecl _o_rint(double) rint
 @ cdecl _o_rintf(float) rintf
-@ cdecl _o_rintl(double) MSVCRT_rint
+@ cdecl _o_rintl(double) rint
 @ cdecl _o_round(double) round
 @ cdecl _o_roundf(float) roundf
 @ cdecl _o_roundl(double) round
@@ -2472,9 +2472,9 @@
 @ cdecl rename(str str)
 @ cdecl -arch=i386 rewind(ptr) rewind_preserve_stack
 @ cdecl -arch=!i386 rewind(ptr)
-@ cdecl rint(double) MSVCRT_rint
+@ cdecl rint(double)
 @ cdecl rintf(float)
-@ cdecl rintl(double) MSVCRT_rint
+@ cdecl rintl(double) rint
 @ cdecl round(double)
 @ cdecl roundf(float)
 @ cdecl roundl(double) round
diff --git a/libs/musl/src/math/rint.c b/libs/musl/src/math/rint.c
index ad35201b266..4d73758dda9 100644
--- a/libs/musl/src/math/rint.c
+++ b/libs/musl/src/math/rint.c
@@ -15,14 +15,20 @@ double __cdecl rint(double x)
    union {double f; uint64_t i;} u = {x};
    int e = u.i>>52 & 0x7ff;
    int s = u.i>>63;
+	unsigned cw;
    double_t y;

if (e >= 0x3ff+52)
    	return x;
+	cw = _controlfp(0, 0);
+	if ((cw & _MCW_PC) != _PC_53)
+		_controlfp(_PC_53, _MCW_PC);
    if (s)
    	y = fp_barrier(x - toint) + toint;
    else
    	y = fp_barrier(x + toint) - toint;
+	if ((cw & _MCW_PC) != _PC_53)
+		_controlfp(cw, _MCW_PC);
    if (y == 0)
    	return s ? -0.0 : 0;
    return y;

[Bernhard Übelacker (＠bernhardu)]

Just for information. I noticed the [pattern page](https://test.winehq.org/data/patterns.html#d3dcompiler_42:hlsl_d3d9) started to succeed a few days ago, without this merge request getting in, where this failures were the reason I commented in !7748 in the first place.

This seems to be caused by 78bc123385 by @Mystral.

[Matteo Bruni (＠Mystral)]

Right, I think that ideally we want to fix this, but that there was no reason for that particular test to be so tied to math accuracy.