Reorganize two functions which seem to be tickling a gcc bug

src/mesa/math/m_matrix.c

@@ -911,21 +911,28 @@ _math_matrix_frustum( GLmatrix *mat,
 		      GLfloat bottom, GLfloat top,
 		      GLfloat nearval, GLfloat farval )
 {
-   GLfloat x, y, a, b, c, d;
    GLfloat m[16];
 
-   x = (2.0F*nearval) / (right-left);
-   y = (2.0F*nearval) / (top-bottom);
-   a = (right+left) / (right-left);
-   b = (top+bottom) / (top-bottom);
-   c = -(farval+nearval) / ( farval-nearval);
-   d = -(2.0F*farval*nearval) / (farval-nearval);  /* error? */
-
 #define M(row,col)  m[col*4+row]
-   M(0,0) = x;     M(0,1) = 0.0F;  M(0,2) = a;      M(0,3) = 0.0F;
-   M(1,0) = 0.0F;  M(1,1) = y;     M(1,2) = b;      M(1,3) = 0.0F;
-   M(2,0) = 0.0F;  M(2,1) = 0.0F;  M(2,2) = c;      M(2,3) = d;
-   M(3,0) = 0.0F;  M(3,1) = 0.0F;  M(3,2) = -1.0F;  M(3,3) = 0.0F;
+   M(0,0) = (2.0F*nearval) / (right-left);
+   M(0,1) = 0.0F;
+   M(0,2) = (right+left) / (right-left);
+   M(0,3) = 0.0F;
+   
+   M(1,0) = 0.0F;
+   M(1,1) = (2.0F*nearval) / (top-bottom);
+   M(1,2) = (top+bottom) / (top-bottom);
+   M(1,3) = 0.0F;
+   
+   M(2,0) = 0.0F;
+   M(2,1) = 0.0F;
+   M(2,2) = -(farval+nearval) / ( farval-nearval);
+   M(2,3) = -(2.0F*farval*nearval) / (farval-nearval); 
+   
+   M(3,0) = 0.0F;
+   M(3,1) = 0.0F;
+   M(3,2) = -1.0F;
+   M(3,3) = 0.0F;
 #undef M
 
    matrix_multf( mat, m, MAT_FLAG_PERSPECTIVE );
@@ -951,22 +958,28 @@ _math_matrix_ortho( GLmatrix *mat,
 		    GLfloat bottom, GLfloat top,
 		    GLfloat nearval, GLfloat farval )
 {
-   GLfloat x, y, z;
-   GLfloat tx, ty, tz;
    GLfloat m[16];
 
-   x = 2.0F / (right-left);
-   y = 2.0F / (top-bottom);
-   z = -2.0F / (farval-nearval);
-   tx = -(right+left) / (right-left);
-   ty = -(top+bottom) / (top-bottom);
-   tz = -(farval+nearval) / (farval-nearval);
-
 #define M(row,col)  m[col*4+row]
-   M(0,0) = x;     M(0,1) = 0.0F;  M(0,2) = 0.0F;  M(0,3) = tx;
-   M(1,0) = 0.0F;  M(1,1) = y;     M(1,2) = 0.0F;  M(1,3) = ty;
-   M(2,0) = 0.0F;  M(2,1) = 0.0F;  M(2,2) = z;     M(2,3) = tz;
-   M(3,0) = 0.0F;  M(3,1) = 0.0F;  M(3,2) = 0.0F;  M(3,3) = 1.0F;
+   M(0,0) = 2.0F / (right-left);
+   M(0,1) = 0.0F; 
+   M(0,2) = 0.0F;
+   M(0,3) = -(right+left) / (right-left);
+
+   M(1,0) = 0.0F;  
+   M(1,1) = 2.0F / (top-bottom);
+   M(1,2) = 0.0F;  
+   M(1,3) = -(top+bottom) / (top-bottom);
+
+   M(2,0) = 0.0F;  
+   M(2,1) = 0.0F;  
+   M(2,2) = -2.0F / (farval-nearval);
+   M(2,3) = -(farval+nearval) / (farval-nearval);
+
+   M(3,0) = 0.0F;  
+   M(3,1) = 0.0F;  
+   M(3,2) = 0.0F;  
+   M(3,3) = 1.0F;
 #undef M
 
    matrix_multf( mat, m, (MAT_FLAG_GENERAL_SCALE|MAT_FLAG_TRANSLATION));