[MATH-493] FastMath min and max fail with (Infinity,-Infinity) and (0,0, -0.0)

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.2, 3.0
• Fix Version/s: 2.2, 3.0
• Assignee: Unassigned
• Reporter: Sebb
• Created: 21/Jan/11 21:12
• Updated: 23/Mar/11 20:36
• Resolved: 24/Jan/11 12:49

Description

FastMath min and max fail with (Infinity,-Infinity) and (0,0, -0.0):

min(float 0.0, float -0.0) expected -0.0 actual 0.0
min(float Infinity, float -Infinity) expected -Infinity actual NaN
max(float 0.0, float -0.0) expected 0.0 actual -0.0
max(float Infinity, float -Infinity) expected Infinity actual NaN

Similarly for the double versions.

The Infinity failures are because the code uses Float.isNaN(a + b) which gives NaN when +/1- Infinity are added together.