Use __control87_2 when available

Alc/helpers.c

@@ -185,6 +185,10 @@ void SetMixerFPUMode(FPUCtl *ctl)
     if((CPUCapFlags&CPU_CAP_SSE))
         newState |= 0x8000; /* flush-to-zero */
     _FPU_SETCW(newState);
+#elif defined(HAVE___CONTROL87_2)
+    int mode;
+    __control87_2(0, 0, &ctl->state, NULL);
+    __control87_2(_RC_CHOP|_DN_FLUSH|_PC_24, _MCW_RC|_MCW_DN|_MCW_PC, &mode, NULL);
 #elif defined(HAVE__CONTROLFP)
     ctl->state = _controlfp(0, 0);
     (void)_controlfp(_RC_CHOP|_DN_FLUSH|_PC_24, _MCW_RC|_MCW_DN|_MCW_PC);
@@ -201,6 +205,9 @@ void RestoreFPUMode(const FPUCtl *ctl)
 #if defined(_FPU_GETCW) && defined(_FPU_SETCW) && (defined(__i386__) || defined(__x86_64__))
     fpu_control_t fpuState = ctl->state;
     _FPU_SETCW(fpuState);
+#elif defined(HAVE___CONTROL87_2)
+    int mode;
+    __control87_2(ctl->state, _MCW_RC|_MCW_DN|_MCW_PC, &mode, NULL);
 #elif defined(HAVE__CONTROLFP)
     _controlfp(ctl->state, _MCW_RC|_MCW_DN|_MCW_PC);
 #elif defined(HAVE_FESETROUND)

CMakeLists.txt

@@ -277,6 +277,7 @@ IF(HAVE_FENV_H)
 ENDIF()
 IF(HAVE_FLOAT_H)
     CHECK_SYMBOL_EXISTS(_controlfp float.h HAVE__CONTROLFP)
+    CHECK_SYMBOL_EXISTS(__control87_2 float.h HAVE___CONTROL87_2)
 ENDIF()
 
 CHECK_FUNCTION_EXISTS(strtof HAVE_STRTOF)

config.h.in

@@ -157,6 +157,9 @@
 /* Define if we have _controlfp() */
 #cmakedefine HAVE__CONTROLFP
 
+/* Define if we have __control87_2() */
+#cmakedefine HAVE___CONTROL87_2
+
 /* Define if we have pthread_setschedparam() */
 #cmakedefine HAVE_PTHREAD_SETSCHEDPARAM