diff --git a/backends/graphics/atari/atari-c2p-asm.S b/backends/graphics/atari/atari-c2p-asm.S
index 2da584648e8..14135025c7a 100644
--- a/backends/graphics/atari/atari-c2p-asm.S
+++ b/backends/graphics/atari/atari-c2p-asm.S
@@ -35,9 +35,15 @@
 
 | void asm_c2p1x1_8(const byte *pChunky, const byte *pChunkyEnd, byte *pScreen);
 SYM(asm_c2p1x1_8):
+#ifdef __FASTCALL__
+									| a0: chunky
+	move.l	a1,d0					| chunky end
+	move.l	4(sp),a1				| screen
+#else
 	move.l	(4,sp),a0				| chunky
 	move.l	(8,sp),d0				| chunky end
 	move.l	(12,sp),a1				| screen
+#endif
 	movem.l	d2-d7/a2-a6,-(sp)
 	move.l	d0,a2
 	move.l	#0x0f0f0f0f,d4
@@ -234,10 +240,17 @@ c2p1x1_8_start:
 SYM(asm_c2p1x1_8_tt):
 	movem.l	d2-d7/a2-a6,-(sp)			| 6 + 5 = 11 longs
 
+#ifdef __FASTCALL__
+										| a0: chunky
+	move.l	a1,a2						| a2: chunky end
+	move.l	(11*4+4,sp),a1				| a1: screen
+										| d0.l: screen pitch (double width)
+#else
 	move.l	(11*4+4,sp),a0				| a0: chunky
 	move.l	(11*4+8,sp),a2				| a2: chunky end
 	move.l	(11*4+12,sp),a1				| a1: screen
 	move.l	(11*4+16,sp),d0				| d0.l: screen pitch (double width)
+#endif
 
 	move.l	sp,old_sp
 
@@ -449,12 +462,21 @@ c2p1x1_8_tt_start:
 SYM(asm_c2p1x1_8_rect):
 	movem.l	d2-d7/a2-a6,-(sp)			| 6 + 5 = 11 longs
 
+#ifdef __FASTCALL__
+										| a0: chunky
+	move.l	a1,chunky_end
+										| d0.l: chunky width
+	move.l	(11*4+4,sp),a1				| a1: screen
+	exg		d1,d2						| d2.l: chunky pitch
+										| d1.l: screen pitch
+#else
 	move.l	(11*4+4,sp),a0				| a0: chunky
 	move.l	(11*4+8,sp),chunky_end
 	move.l	(11*4+12,sp),d0				| d0.l: chunky width
 	move.l	(11*4+16,sp),d2				| d2.l: chunky pitch
 	move.l	(11*4+20,sp),a1				| a1: screen
 	move.l	(11*4+24,sp),d1				| d1.l: screen pitch
+#endif
 
 	move.l	sp,old_sp
 
@@ -679,9 +701,15 @@ c2p1x1_8_rect_done:
 
 | void asm_c2p1x1_4(const byte *pChunky, const byte *pChunkyEnd, byte *pScreen);
 SYM(asm_c2p1x1_4):
+#ifdef __FASTCALL__
+									| a0: chunky
+	move.l	a1,d0					| chunky end
+	move.l	4(sp),a1				| screen
+#else
 	move.l	(4,sp),a0				| chunky
 	move.l	(8,sp),d0				| chunky end
 	move.l	(12,sp),a1				| screen
+#endif
 	movem.l	d2-d7/a2-a6,-(sp)
 	move.l	d0,a2
 	move.l	#0x0f0f0f0f,d4
@@ -785,12 +813,21 @@ c2p1x1_4_start:
 SYM(asm_c2p1x1_4_rect):
 	movem.l	d2-d7/a2-a6,-(sp)			| 6 + 5 = 11 longs
 
+#ifdef __FASTCALL__
+										| a0: chunky
+	move.l	a1,chunky_end
+										| d0.l: chunky width
+	move.l	(11*4+4,sp),a1				| a1: screen
+	exg		d1,d2						| d2.l: chunky pitch
+										| d1.l: screen pitch
+#else
 	move.l	(11*4+4,sp),a0				| a0: chunky
 	move.l	(11*4+8,sp),chunky_end
 	move.l	(11*4+12,sp),d0				| d0.l: chunky width
 	move.l	(11*4+16,sp),d2				| d2.l: chunky pitch
 	move.l	(11*4+20,sp),a1				| a1: screen
 	move.l	(11*4+24,sp),d1				| d1.l: screen pitch
+#endif
 
 	move.l	sp,old_sp
 
diff --git a/backends/graphics/atari/atari-graphics-asm.S b/backends/graphics/atari/atari-graphics-asm.S
index 90a811172db..8534876d7ae 100644
--- a/backends/graphics/atari/atari-graphics-asm.S
+++ b/backends/graphics/atari/atari-graphics-asm.S
@@ -32,6 +32,18 @@
 SYM(asm_draw_4bpl_sprite):
 	movem.l	d0-d7/a0-a2,-(sp)		| 11 longs
 
+#ifdef __FASTCALL__
+	move.l	a0,a2					| a2: dstBuffer
+									| a1: srcBuffer
+	move.l	(4+11*4,sp),a0			| a0: srcMask
+									| d0.w: destX
+									| d1.w: destY
+	move.l	d2,d3					| d3.w: dstPitch
+	ext.l	d3						| d3.l: dstPitch
+	move.l	(8+11*4,sp),d6			| d6.w: w
+	lsr.w	#4,d6					| d6.w: w/16
+	move.l	(12+11*4,sp),d7			| d7.w: h
+#else
 	move.l	(4+11*4,sp),a2			| a2: dstBuffer
 	move.l	(8+11*4,sp),a1			| a1: srcBuffer
 	move.l	(12+11*4,sp),a0			| a0: srcMask
@@ -42,6 +54,7 @@ SYM(asm_draw_4bpl_sprite):
 	move.l	(28+11*4,sp),d6			| d6.w: w
 	lsr.w	#4,d6				| d6.w: w/16
 	move.l	(32+11*4,sp),d7			| d7.w: h
+#endif
 
 | Draws a 4 bitplane sprite at any position on screen.
 | (c) 1999 Pieter van der Meer (EarX)
@@ -130,6 +143,18 @@ sprite4_xloop:
 SYM(asm_draw_8bpl_sprite):
 	movem.l	d0-d7/a0-a2,-(sp)		| 11 longs
 
+#ifdef __FASTCALL__
+	move.l	a0,a2					| a2: dstBuffer
+									| a1: srcBuffer
+	move.l	(4+11*4,sp),a0			| a0: srcMask
+									| d0.w: destX
+									| d1.w: destY
+	move.l	d2,d3					| d3.w: dstPitch
+	ext.l	d3						| d3.l: dstPitch
+	move.l	(8+11*4,sp),d6			| d6.w: w
+	lsr.w	#4,d6					| d6.w: w/16
+	move.l	(12+11*4,sp),d7			| d7.w: h
+#else
 	move.l	(4+11*4,sp),a2			| a2: dstBuffer
 	move.l	(8+11*4,sp),a1			| a1: srcBuffer
 	move.l	(12+11*4,sp),a0			| a0: srcMask
@@ -140,6 +165,7 @@ SYM(asm_draw_8bpl_sprite):
 	move.l	(28+11*4,sp),d6			| d6.w: w
 	lsr.w	#4,d6				| d6.w: w/16
 	move.l	(32+11*4,sp),d7			| d7.w: h
+#endif
 
 	move.w  d0,d2				| / Calculate the
 	andi.w  #0b111111110000,d0		| | number of bits
diff --git a/backends/platform/atari/build-release.sh b/backends/platform/atari/build-release.sh
index 72261e46278..4f6d14e075a 100755
--- a/backends/platform/atari/build-release.sh
+++ b/backends/platform/atari/build-release.sh
@@ -7,12 +7,20 @@ mkdir -p build-release
 cd build-release
 
 PLATFORM=m68k-atari-mintelf
+FASTCALL=false
 
 export ASFLAGS="-m68020-60"
 export CXXFLAGS="-m68020-60 -DUSE_MOVE16 -DUSE_SUPERVIDEL -DUSE_SV_BLITTER"
 export LDFLAGS="-m68020-60 -Wl,--msuper-memory"
 export PKG_CONFIG_LIBDIR="$(${PLATFORM}-gcc -print-sysroot)/usr/lib/m68020-60/pkgconfig"
 
+if $FASTCALL
+then
+	ASFLAGS="$ASFLAGS -mfastcall"
+	CXXFLAGS="$CXXFLAGS -mfastcall"
+	LDFLAGS="$LDFLAGS -mfastcall"
+fi
+
 if [ ! -f config.log ]
 then
 ../configure \
diff --git a/backends/platform/atari/build-release030.sh b/backends/platform/atari/build-release030.sh
index 2502bc7e9f0..d08b1b943fb 100755
--- a/backends/platform/atari/build-release030.sh
+++ b/backends/platform/atari/build-release030.sh
@@ -7,12 +7,20 @@ mkdir -p build-release030
 cd build-release030
 
 PLATFORM=m68k-atari-mintelf
+FASTCALL=false
 
 export ASFLAGS="-m68030"
 export CXXFLAGS="-m68030 -DDISABLE_FANCY_THEMES"
 export LDFLAGS="-m68030 -Wl,--msuper-memory"
 export PKG_CONFIG_LIBDIR="$(${PLATFORM}-gcc -print-sysroot)/usr/lib/m68020-60/pkgconfig"
 
+if $FASTCALL
+then
+	ASFLAGS="$ASFLAGS -mfastcall"
+	CXXFLAGS="$CXXFLAGS -mfastcall"
+	LDFLAGS="$LDFLAGS -mfastcall"
+fi
+
 if [ ! -f config.log ]
 then
 ../configure \