Fix some synth_* help messages

Mostly memory_libmap arg checks; puts the checks into an else block on the `if (help_mode)` check to avoid cases like `synth_ice40` listing `-no-auto-huge [-no-auto-huge]`.
Also fix `map_iopad` section being empty in `synth_fabulous`.

techlibs/anlogic/synth_anlogic.cc

@@ -169,12 +169,14 @@ struct SynthAnlogicPass : public ScriptPass
 		if (check_label("map_ram"))
 		{
 			std::string args = "";
-			if (nobram)
-				args += " -no-auto-block";
-			if (nolutram)
-				args += " -no-auto-distributed";
 			if (help_mode)
 				args += " [-no-auto-block] [-no-auto-distributed]";
+			else {
+				if (nobram)
+					args += " -no-auto-block";
+				if (nolutram)
+					args += " -no-auto-distributed";
+			}
 			run("memory_libmap -lib +/anlogic/lutrams.txt -lib +/anlogic/brams.txt" + args, "(-no-auto-block if -nobram, -no-auto-distributed if -nolutram)");
 			run("techmap -map +/anlogic/lutrams_map.v -map +/anlogic/brams_map.v");
 		}

techlibs/ecp5/synth_ecp5.cc

@@ -308,12 +308,14 @@ struct SynthEcp5Pass : public ScriptPass
 		if (check_label("map_ram"))
 		{
 			std::string args = "";
-			if (nobram)
-				args += " -no-auto-block";
-			if (nolutram)
-				args += " -no-auto-distributed";
 			if (help_mode)
 				args += " [-no-auto-block] [-no-auto-distributed]";
+			else {
+				if (nobram)
+					args += " -no-auto-block";
+				if (nolutram)
+					args += " -no-auto-distributed";
+			}
 			run("memory_libmap -lib +/ecp5/lutrams.txt -lib +/ecp5/brams.txt" + args, "(-no-auto-block if -nobram, -no-auto-distributed if -nolutram)");
 			run("techmap -map +/ecp5/lutrams_map.v -map +/ecp5/brams_map.v");
 		}

techlibs/efinix/synth_efinix.cc

@@ -161,9 +161,13 @@ struct SynthEfinixPass : public ScriptPass
 		if (check_label("map_ram"))
 		{
 			std::string args = "";
-			if (nobram)
-				args += " -no-auto-block";
-			run("memory_libmap -lib +/efinix/brams.txt" + args);
+			if (help_mode)
+				args += " [-no-auto-block]";
+			else {
+				if (nobram)
+					args += " -no-auto-block";
+			}
+			run("memory_libmap -lib +/efinix/brams.txt" + args, "(-no-auto-block if -nobram)");
 			run("techmap -map +/efinix/brams_map.v");
 		}
 

techlibs/fabulous/synth_fabulous.cc

@@ -320,7 +320,7 @@ struct SynthPass : public ScriptPass
 			run("opt_clean");
 		}
 
-		if (check_label("map_ram")) {
+		if (check_label("map_ram", "(unless -noregfile)")) {
 			// RegFile extraction
 			if (!noregfile) {
 				run("memory_libmap -lib +/fabulous/ram_regfile.txt");
@@ -342,7 +342,7 @@ struct SynthPass : public ScriptPass
 		}
 
 		if (check_label("map_iopad", "(if -iopad)")) {
-			if (iopad) {
+			if (iopad || help_mode) {
 				run("opt -full");
 				run("iopadmap -bits -outpad $__FABULOUS_OBUF I:PAD -inpad $__FABULOUS_IBUF O:PAD "
 					"-toutpad IO_1_bidirectional_frame_config_pass ~T:I:PAD "

techlibs/gowin/synth_gowin.cc

@@ -230,12 +230,14 @@ struct SynthGowinPass : public ScriptPass
 		if (check_label("map_ram"))
 		{
 			std::string args = "";
-			if (nobram)
-				args += " -no-auto-block";
-			if (nolutram)
-				args += " -no-auto-distributed";
 			if (help_mode)
 				args += " [-no-auto-block] [-no-auto-distributed]";
+			else {
+				if (nobram)
+					args += " -no-auto-block";
+				if (nolutram)
+					args += " -no-auto-distributed";
+			}
 			run("memory_libmap -lib +/gowin/lutrams.txt -lib +/gowin/brams.txt" + args, "(-no-auto-block if -nobram, -no-auto-distributed if -nolutram)");
 			run("techmap -map +/gowin/lutrams_map.v -map +/gowin/brams_map.v");
 		}

techlibs/ice40/synth_ice40.cc

@@ -353,12 +353,14 @@ struct SynthIce40Pass : public ScriptPass
 		if (check_label("map_ram"))
 		{
 			std::string args = "";
-			if (!spram)
-				args += " -no-auto-huge";
-			if (nobram)
-				args += " -no-auto-block";
 			if (help_mode)
 				args += " [-no-auto-huge] [-no-auto-block]";
+			else {
+				if (!spram)
+					args += " -no-auto-huge";
+				if (nobram)
+					args += " -no-auto-block";
+			}
 			run("memory_libmap -lib +/ice40/brams.txt -lib +/ice40/spram.txt" + args, "(-no-auto-huge unless -spram, -no-auto-block if -nobram)");
 			run("techmap -map +/ice40/brams_map.v -map +/ice40/spram_map.v");
 			run("ice40_braminit");

techlibs/lattice/synth_lattice.cc

@@ -373,12 +373,14 @@ struct SynthLatticePass : public ScriptPass
 		if (check_label("map_ram"))
 		{
 			std::string args = "";
-			if (nobram)
-				args += " -no-auto-block";
-			if (nolutram)
-				args += " -no-auto-distributed";
 			if (help_mode)
 				args += " [-no-auto-block] [-no-auto-distributed]";
+			else {
+				if (nobram)
+					args += " -no-auto-block";
+				if (nolutram)
+					args += " -no-auto-distributed";
+			}
 			run("memory_libmap -lib +/lattice/lutrams.txt -lib +/lattice/brams" + brams_map + ".txt" + args, "(-no-auto-block if -nobram, -no-auto-distributed if -nolutram)");
 			run("techmap -map +/lattice/lutrams_map.v -map +/lattice/brams_map" + brams_map + ".v");
 		}

techlibs/nexus/synth_nexus.cc

@@ -300,12 +300,14 @@ struct SynthNexusPass : public ScriptPass
 		{
 			std::string args = "";
 			args += " -no-auto-huge";
-			if (nobram)
-				args += " -no-auto-block";
-			if (nolutram)
-				args += " -no-auto-distributed";
 			if (help_mode)
 				args += " [-no-auto-block] [-no-auto-distributed]";
+			else {
+				if (nobram)
+					args += " -no-auto-block";
+				if (nolutram)
+					args += " -no-auto-distributed";
+			}
 			run("memory_libmap -lib +/nexus/lutrams.txt -lib +/nexus/brams.txt -lib +/nexus/lrams.txt" + args, "(-no-auto-block if -nobram, -no-auto-distributed if -nolutram)");
 			run("techmap -map +/nexus/lutrams_map.v -map +/nexus/brams_map.v -map +/nexus/lrams_map.v");
 		}