Use signbit() in IS_NEGATIVE and DIFFERENT_SIGNS

signbit() appears to be available everywhere (even MSVC according to
MSDN), so let's use it instead of open-coding some messy and confusing
bit twiddling macros.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=54805
Reviewed-by: Paul Berry <[email protected]>
Suggested-by: Ian Romanick <[email protected]>

1 files changed, 2 insertions, 19 deletions

diff --git a/src/mesa/main/macros.h b/src/mesa/main/macros.h
index 04d59d79c07..7b7fd1b6d76 100644
--- a/src/mesa/main/macros.h
+++ b/src/mesa/main/macros.h
@@ -693,31 +693,14 @@ NORMALIZE_3FV(GLfloat v[3])
 static inline GLboolean
 IS_NEGATIVE(float x)
 {
-#if defined(USE_IEEE)
-   fi_type fi;
-   fi.f = x;
-   return fi.i < 0;
-#else
-   return x < 0.0F;
-#endif
+   return signbit(x) != 0;
 }
 
-
 /** Test two floats have opposite signs */
 static inline GLboolean
 DIFFERENT_SIGNS(GLfloat x, GLfloat y)
 {
-#if defined(USE_IEEE)
-   fi_type xfi, yfi;
-   xfi.f = x;
-   yfi.f = y;
-   return !!((xfi.i ^ yfi.i) & (1u << 31));
-#else
-   /* Could just use (x*y<0) except for the flatshading requirements.
-    * Maybe there's a better way?
-    */
-   return ((x) * (y) <= 0.0F && (x) - (y) != 0.0F);
-#endif
+   return signbit(x) != signbit(y);
 }