From: Chris Lu <chris@lulabs.net>
Date: Thu, 25 Jun 2020 12:06:57 +0000 (-0500)
Subject: add comment and sim build rule
X-Git-Url: http://git.joshuawise.com/mandelfpga.git/commitdiff_plain/58414f713ffeb89684711ea376636674b0f691f4?ds=sidebyside;hp=ae2d004d53c6bc6a0fd5727f67ad6812092a959a

add comment and sim build rule
---

diff --git a/Makefile b/Makefile
old mode 100644
new mode 100755
index cd766fa..b7b04ce
--- a/Makefile
+++ b/Makefile
@@ -5,6 +5,9 @@ PART = xc3s1200e-fg320-5
 
 all: fpga_target
 
+sim: mandelsim.c
+	gcc -O3 -lSDL -o mandelsim mandelsim.c -march=pentium3
+
 BITGEN_OPTS = \
 	-w \
 	-g DebugBitstream:No \
diff --git a/mandelsim.c b/mandelsim.c
index 16bdf46..2ce2feb 100644
--- a/mandelsim.c
+++ b/mandelsim.c
@@ -5,6 +5,9 @@
 #define YRES 480
 #define MAX_ITER 66
 #define MAXNUM 0x8000
+
+/* be sure to change the number of bits in the multiplier when doing this
+ * bits > 14 need extension of num_t to unsigned int */
 #define BITS 14
 #define BAIL (1 << (BITS + 1))
 #define BAIL_A (1 << BITS)