well, that's one way to confuse anybody

fixes the floating point exception

libs/video/renderer/sw/d_polysa.S

@@ -205,12 +205,12 @@ C(D_PolysetCalcGradients):
 							//  (t1*p01_minus_p21 - t0*p11_minus_p21)*
 							//  xstepdenominv | ystepdenominv |
 							//  xstepdenominv | p00_minus_p20 | p11_minus_p21
-	fldcw	ceil_cw
+	fldcw	r_ceil_cw
 	fistpl	C(r_lstepy)		// r_lstepx | ystepdenominv | xstepdenominv |
 							//  p00_minus_p20 | p11_minus_p21
 	fistpl	C(r_lstepx)		// ystepdenominv | xstepdenominv | p00_minus_p20 |
 							//  p11_minus_p21
-	fldcw	single_cw
+	fldcw	r_single_cw
 
 //	t0 = r_p0[2] - r_p2[2];
 //	t1 = r_p1[2] - r_p2[2];

libs/video/renderer/sw/sw_rdrawa.S

@@ -153,7 +153,7 @@ Lemit:
 //
 // FIXME: do away with by manually extracting integers from floats?
 // FIXME: set less often
-	fldcw	ceil_cw
+	fldcw	r_ceil_cw
 
 //	edge_t	*edge, *pcheck;
 //	int		u_check;
@@ -220,7 +220,7 @@ LCalcSecond:
 //	r_ceilv1 = (int)(r_v1 - 2000) + 2000; // ceil(r_v1);
 	fistl	C(r_ceilv1)
 
-	fldcw	single_cw				// put back normal floating-point state
+	fldcw	r_single_cw				// put back normal floating-point state
 
 	fsts	C(r_v1)
 	fxch	%st(4)					// lzi0 | lzi1 | u1 | v0 | v1 | u0

libs/video/renderer/sw/sw_rmain.c

@@ -137,6 +137,7 @@ float       se_time1, se_time2, de_time1, de_time2, dv_time1, dv_time2;
 void        R_MarkLeaves (void);
 
 void R_LoadSky_f (void);
+void R_InitVars (void);
 
 void
 R_Init (void)
@@ -146,6 +147,8 @@ R_Init (void)
 	// get stack position so we can guess if we are going to overflow
 	r_stack_start = (byte *) & dummy;
 
+	R_InitVars ();
+
 	R_InitTurb ();
 
 	Cmd_AddCommand ("timerefresh", R_TimeRefresh_f, "Tests the current "

libs/video/renderer/sw/sw_rvarsa.S

@@ -65,8 +65,20 @@ FloatZero:				.long	0
 Float2ToThe31nd:		.long	0x4f000000
 FloatMinus2ToThe31nd:	.long	0xcf000000
 
+.globl	r_ceil_cw, r_single_cw
+r_ceil_cw:		.long	0
+r_single_cw:	.long	0
+
 .globl	C(r_bmodelactive)
 C(r_bmodelactive):		.long	0
 
+.global C(R_InitVars)
+C(R_InitVars):
+	movl	ceil_cw, %eax
+	movl	single_cw, %edx
+	movl	%eax, r_ceil_cw
+	movl	%edx, r_single_cw
+	ret
+
 #endif	// USE_INTEL_ASM