Move the FPU mode declarations to a separate header

Also don't use inheritance with FPUCtl.

1 files changed, 37 insertions, 0 deletions

diff --git a/Alc/fpu_modes.h b/Alc/fpu_modes.h
new file mode 100644
index 00000000..750252fc
--- /dev/null
+++ b/Alc/fpu_modes.h
@@ -0,0 +1,37 @@
+#ifndef FPU_MODES_H
+#define FPU_MODES_H
+
+#ifdef HAVE_FENV_H
+#include <fenv.h>
+#endif
+
+
+typedef struct FPUCtl {
+#ifdef HAVE_FENV_H
+    fenv_t flt_env;
+#ifdef _WIN32
+    int round_mode;
+#endif
+#else
+    int state;
+#endif
+#ifdef HAVE_SSE
+    int sse_state;
+#endif
+} FPUCtl;
+void SetMixerFPUMode(FPUCtl *ctl);
+void RestoreFPUMode(const FPUCtl *ctl);
+
+#ifdef __GNUC__
+/* Use an alternate macro set with GCC to avoid accidental continue or break
+ * statements within the mixer mode.
+ */
+#define START_MIXER_MODE() __extension__({ FPUCtl _oldMode; SetMixerFPUMode(&_oldMode)
+#define END_MIXER_MODE() RestoreFPUMode(&_oldMode); })
+#else
+#define START_MIXER_MODE() do { FPUCtl _oldMode; SetMixerFPUMode(&_oldMode)
+#define END_MIXER_MODE() RestoreFPUMode(&_oldMode); } while(0)
+#endif
+#define LEAVE_MIXER_MODE() RestoreFPUMode(&_oldMode)
+
+#endif /* FPU_MODES_H */