Remove -ffast-math from compiler FLAGS. Fix display value of "-0" in tooltip.

compile.mk

@@ -8,9 +8,11 @@ OBJCOPY ?= objcopy
 
 # Generate dependency files alongside the object files
 FLAGS += -MMD -MP
+# Debugger symbols. These are removed with `strip`.
 FLAGS += -g
 # Optimization
-FLAGS += -O3 -march=nocona -ffast-math -fno-finite-math-only
+FLAGS += -O3 -march=nocona
+# Warnings
 FLAGS += -Wall -Wextra -Wno-unused-parameter
 
 ifneq ($(ARCH), mac)

include/math.hpp

@@ -103,6 +103,11 @@ inline float sgn(float x) {
 	return x > 0.f ? 1.f : x < 0.f ? -1.f : 0.f;
 }
 
+/** Converts -0.f to 0.f. Leaves all other values unchanged. */
+inline float normalizeZero(float x) {
+	return x + 0.f;
+}
+
 inline float eucMod(float a, float base) {
 	float mod = std::fmod(a, base);
 	return (mod >= 0.0f) ? mod : mod + base;

include/ui/Quantity.hpp

@@ -1,7 +1,6 @@
 #pragma once
 #include "ui/common.hpp"
 #include "math.hpp"
-#include "string.hpp"
 
 
 namespace rack {
@@ -46,16 +45,9 @@ struct Quantity {
 	virtual int getDisplayPrecision() {return 2;}
 
 	/** Returns a string representation of the display value */
-	virtual std::string getDisplayValueString() {
-		return string::f("%.*f", getDisplayPrecision(), getDisplayValue());
-	}
+	virtual std::string getDisplayValueString();
 
-	virtual void setDisplayValueString(std::string s) {
-		float displayValue = 0.f;
-		int n = std::sscanf(s.c_str(), "%f", &displayValue);
-		if (n == 1)
-			setDisplayValue(displayValue);
-	}
+	virtual void setDisplayValueString(std::string s);
 
 	/** The name of the quantity */
 	virtual std::string getLabel() {return "";}
@@ -66,14 +58,7 @@ struct Quantity {
 	virtual std::string getUnit() {return "";}
 
 	/** Returns a string representation of the quantity */
-	virtual std::string getString() {
-		std::string s;
-		std::string label = getLabel();
-		if (!label.empty())
-			s += label + ": ";
-		s += getDisplayValueString() + getUnit();
-		return s;
-	}
+	virtual std::string getString();
 
 	// Helper methods
 

src/ui/Quantity.cpp

@@ -0,0 +1,29 @@
+#include "ui/Quantity.hpp"
+#include "string.hpp"
+
+
+namespace rack {
+
+
+std::string Quantity::getDisplayValueString() {
+	return string::f("%.*f", getDisplayPrecision(), math::normalizeZero(getDisplayValue()));
+}
+
+void Quantity::setDisplayValueString(std::string s) {
+	float displayValue = 0.f;
+	int n = std::sscanf(s.c_str(), "%f", &displayValue);
+	if (n == 1)
+		setDisplayValue(displayValue);
+}
+
+std::string Quantity::getString() {
+	std::string s;
+	std::string label = getLabel();
+	if (!label.empty())
+		s += label + ": ";
+	s += getDisplayValueString() + getUnit();
+	return s;
+}
+
+
+} // namespace rack