replace some divisions with reciprocals

git-svn-id: svn://svn.icculus.org/twilight/trunk/darkplaces@10762 d7cf8633-e32d-0410-b094-e92efae38249

diff --git a/dpsoftrast.c b/dpsoftrast.c
index 56e15100fe8615b7321f63af11a0dc4842ba238f..097ac47617330cb01242d0f5118d0d6b18136788 100644 (file)
--- a/dpsoftrast.c
+++ b/dpsoftrast.c
@@ -3716,11 +3716,11 @@ void DPSOFTRAST_Draw_ProcessTriangles(int firstvertex, int numtriangles, const i
                                edge1p = tmp;
                        }       
                        edge0lerp = _mm_shuffle_ps(screen[edge0p], screen[edge0p], _MM_SHUFFLE(1, 1, 1, 1));
-                       edge0scale = _mm_div_ss(_mm_set1_ps(1.0f), _mm_sub_ss(_mm_shuffle_ps(screen[edge0n], screen[edge0n], _MM_SHUFFLE(1, 1, 1, 1)), edge0lerp));
+                       edge0scale = _mm_rcp_ss(_mm_sub_ss(_mm_shuffle_ps(screen[edge0n], screen[edge0n], _MM_SHUFFLE(1, 1, 1, 1)), edge0lerp));
                        edge0scale = _mm_shuffle_ps(edge0scale, edge0scale, _MM_SHUFFLE(0, 0, 0, 0));
                        edge0lerp = _mm_mul_ps(_mm_sub_ps(_mm_set1_ps(y), edge0lerp), edge0scale);
                        edge1lerp = _mm_shuffle_ps(screen[edge1p], screen[edge1p], _MM_SHUFFLE(1, 1, 1, 1));
-                       edge1scale = _mm_div_ss(_mm_set1_ps(1.0f), _mm_sub_ss(_mm_shuffle_ps(screen[edge1n], screen[edge1n], _MM_SHUFFLE(1, 1, 1, 1)), edge1lerp));
+                       edge1scale = _mm_rcp_ss(_mm_sub_ss(_mm_shuffle_ps(screen[edge1n], screen[edge1n], _MM_SHUFFLE(1, 1, 1, 1)), edge1lerp));
                        edge1scale = _mm_shuffle_ps(edge1scale, edge1scale, _MM_SHUFFLE(0, 0, 0, 0));
                        edge1lerp = _mm_mul_ps(_mm_sub_ps(_mm_set1_ps(y), edge1lerp), edge1scale);
                        for(; y <= nexty; y++, edge0lerp = _mm_add_ps(edge0lerp, edge0scale), edge1lerp = _mm_add_ps(edge1lerp, edge1scale))
@@ -3771,7 +3771,6 @@ void DPSOFTRAST_Draw_ProcessTriangles(int firstvertex, int numtriangles, const i
                                // buffer for pixel intermediate data, we split long spans...
                                while (span->length > DPSOFTRAST_DRAW_MAXSPANLENGTH)
                                {
-                                       __m128 maxspanlengthm;
                                        span->length = DPSOFTRAST_DRAW_MAXSPANLENGTH;
                                        if (dpsoftrast.draw.numspans >= DPSOFTRAST_DRAW_MAXSPANQUEUE)
                                        {
@@ -3785,13 +3784,12 @@ void DPSOFTRAST_Draw_ProcessTriangles(int firstvertex, int numtriangles, const i
                                        span->start = y * width + startx;
                                        span->length = endx - startx;
                                        j = DPSOFTRAST_ARRAY_TOTAL;
-                                       maxspanlengthm = _mm_set1_ps(DPSOFTRAST_DRAW_MAXSPANLENGTH);
-                                       _mm_store_ps(span->data[0][j], _mm_add_ps(_mm_load_ps(span->data[0][j]), _mm_mul_ps(_mm_load_ps(span->data[1][j]), maxspanlengthm)));
+                                       _mm_store_ps(span->data[0][j], _mm_add_ps(_mm_load_ps(span->data[0][j]), _mm_mul_ps(_mm_load_ps(span->data[1][j]), _mm_set1_ps(DPSOFTRAST_DRAW_MAXSPANLENGTH))));
                                        for (j = 0;j < DPSOFTRAST_ARRAY_TOTAL;j++)
                                        {
                                                //if (arraymask[j])
                                                {
-                                                        _mm_store_ps(span->data[0][j], _mm_add_ps(_mm_load_ps(span->data[0][j]), _mm_mul_ps(_mm_load_ps(span->data[1][j]), maxspanlengthm)));
+                                                        _mm_store_ps(span->data[0][j], _mm_add_ps(_mm_load_ps(span->data[0][j]), _mm_mul_ps(_mm_load_ps(span->data[1][j]), _mm_set1_ps(DPSOFTRAST_DRAW_MAXSPANLENGTH))));
                                                }
                                        }
                                }