fix some more compiler warnings

and a bit of formatting

ChangeLog

@@ -4,15 +4,14 @@
 - ifthenelse needs less C stack during eval
 - better rounding in bilinear interpolator
 - fix to "make check" in non-C locales [felixbuenemann]
-- use builtin isnan isinf when possible [Lovell Fuller]
+- use compiler builtins isnan, isinf, fabs, fmin, fmax, ceil, floor when 
+  possible [Lovell Fuller]
 - tune vips_shrinkh(), 30% faster [Lovell Fuller]
 - remove SEQ hint from vips_subsample(), fixes cli performance [erdmann]
 - fix double free on attach ICC profile from file in tiff write [erdmann]
-- add VIPS_FLOOR()/VIPS_CEIL(), much faster [Lovell Fuller]
-- use g_assert_not_reached();
+- use g_assert_not_reached() 
 - better vips-from-C docs
-- add VIPS_FMIN() / VIPS_FMAX() / VIPS_FABS() / VIPS_FCLIP() ... use builtins 
-  when available
+- remove Duff from im_conv() / im_conv_f() for a 25% speedup [Lovell Fuller]
 
 1/1/16 started 8.2.1
 - add a compat stub [Benjamin Gilbert]

libvips/conversion/join.c

@@ -99,6 +99,11 @@ vips_join_build( VipsObject *object )
 	if( VIPS_OBJECT_CLASS( vips_join_parent_class )->build( object ) )
 		return( -1 );
 
+	/* Stop compiler warnings.
+	 */
+	x = 0;
+	y = 0;
+
 	switch( join->direction ) {
 	case VIPS_DIRECTION_HORIZONTAL:
 		x = join->in1->Xsize + join->shim;
@@ -118,10 +123,6 @@ vips_join_build( VipsObject *object )
 
 		default:
 			g_assert_not_reached();
-
-			/* Stop compiler warnings.
-			 */
-			y = 0;
 		}
 
 		break;
@@ -144,10 +145,6 @@ vips_join_build( VipsObject *object )
 
 		default:
 			g_assert_not_reached();
-
-			/* Stop compiler warnings.
-			 */
-			x = 0;
 		}
 
 		break;

libvips/convolution/im_conv.c

@@ -67,6 +67,8 @@
  * 	- argh typo in overflow estimation could cause errors
  * 15/10/11 Nicolas
  * 	- handle offset correctly in seperable convolutions
+ * 26/1/16 Lovell Fuller
+ * 	- remove Duff for a 25% speedup
  */
 
 /*
@@ -635,9 +637,10 @@ conv_start( IMAGE *out, void *a, void *b )
 	TYPE * restrict q = (TYPE *) IM_REGION_ADDR( or, le, y ); \
 	\
 	for( x = 0; x < sz; x++ ) {  \
+		int sum; \
 		int i; \
-		int sum = 0; \
 		\
+		sum = 0; \
 		for ( i = 0; i < nnz; i++ ) \
 			sum += t[i] * p[i][x]; \
 		\
@@ -656,9 +659,10 @@ conv_start( IMAGE *out, void *a, void *b )
 	TYPE * restrict q = (TYPE *) IM_REGION_ADDR( or, le, y ); \
 	\
 	for( x = 0; x < sz; x++ ) {  \
+		double sum; \
 		int i; \
-		double sum = 0; \
 		\
+		sum = 0; \
 		for ( i = 0; i < nnz; i++ ) \
 			sum += t[i] * p[i][x]; \
  		\

libvips/convolution/im_conv_f.c

@@ -43,6 +43,8 @@
  * 	  keeping two versions
  * 15/10/11 Nicolas
  * 	- handle offset correctly in seperable convolutions
+ * 26/1/16 Lovell Fuller
+ * 	- remove Duff for a 25% speedup
  */
 
 /*
@@ -209,9 +211,10 @@ conv_start( IMAGE *out, void *a, void *b )
 	OTYPE * restrict q = (OTYPE *) IM_REGION_ADDR( or, le, y ); \
 	\
 	for( x = 0; x < sz; x++ ) {  \
+		double sum; \
 		int i; \
-		double sum = 0; \
 		\
+		sum = 0; \
 		for ( i = 0; i < nnz; i++ ) \
 			sum += t[i] * p[i][x]; \
  		\

libvips/resample/mapim.c

@@ -112,6 +112,13 @@ vips_mapim_region_minmax( VipsRegion *region, VipsRect *r, VipsRect *bounds )
 	gboolean first;
 	int x, y;
 
+	/* Stop compiler warnings.
+	 */
+	min_x = 0;
+	max_x = 0;
+	min_y = 0;
+	max_y = 0;
+
 	first = TRUE;
 	for( y = 0; y < r->height; y++ ) {
 		VipsPel * restrict p = 
@@ -141,13 +148,6 @@ vips_mapim_region_minmax( VipsRegion *region, VipsRect *r, VipsRect *bounds )
 
 		default:
 			g_assert_not_reached();
-
-			/* Stop compiler warnings.
-			 */
-			min_x = 0;
-			max_x = 0;
-			min_y = 0;
-			max_y = 0;
 		}
 	}