[PATCH v2 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?

--
  v2: libs/musl: Base rounding constant on precision mode.

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

[PATCH v2 1/1] libs/musl: Base rounding constant on precision mode.

[Daniel Lehman]

From: Daniel Lehman

---
 dlls/ntdll/math.c         |  5 +++++
 libs/musl/src/math/rint.c | 13 +++++--------
 2 files changed, 10 insertions(+), 8 deletions(-)

diff --git a/dlls/ntdll/math.c b/dlls/ntdll/math.c
index 73a5bb8cd33..2d0d593a7d1 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 __cdecl _control87(unsigned int, unsigned int)
+{
+    return 0;
+}
+
 /*********************************************************************
  *                  abs   (NTDLL.@)
  */
diff --git a/libs/musl/src/math/rint.c b/libs/musl/src/math/rint.c
index ad35201b266..dbe353caaf9 100644
--- a/libs/musl/src/math/rint.c
+++ b/libs/musl/src/math/rint.c
@@ -3,22 +3,19 @@
 #include <stdint.h>
 #include "libm.h"

-#if FLT_EVAL_METHOD==0 || FLT_EVAL_METHOD==1
-#define EPS DBL_EPSILON
-#elif FLT_EVAL_METHOD==2
-#define EPS LDBL_EPSILON
-#endif
-static const double_t toint = 1/EPS;
-
 double __cdecl rint(double x)
 {
    union {double f; uint64_t i;} u = {x};
    int e = u.i>>52 & 0x7ff;
    int s = u.i>>63;
-	double_t y;
+	double_t y, toint;

if (e >= 0x3ff+52)
    	return x;
+
+	if ((_control87(0, 0) & _MCW_PC) == _PC_24) toint = 1 / FLT_EPSILON;
+	else toint = 1 / DBL_EPSILON;
+
    if (s)
    	y = fp_barrier(x - toint) + toint;
    else

[Daniel Lehman (＠dlehman25)]

latest tested with 78bc12338556d7aa2e970df9121755618d568dcf reverted