From 0bcce65d5e3001b1b7098aa2c1ccd60fcc2a6628 Mon Sep 17 00:00:00 2001
From: chick
Date: Thu, 12 Dec 2019 12:06:15 -0800
Subject: - New trait HasBinaryPoint which provides literal values as double
 and big decimal - made .F and .I work for creating fixed point and interval
 lits from big decimal - Added NumObject trait which provides new math
 conversions - Made a Num object that extends NumObject - Add this trait to
 FixedPoint and Interval for backward compatibility - Removed code that is now
 in NumObject, keeping things DRY - Add tests to FixedPointSpec to show lit
 conversion to double and big decimal - Add tests to IntervalSpec to show lit
 conversion to double and big decimal - Add tests to LiteralExtractorSpec to
 show general math conversions between BigInts with binary points and double
 and big decimal

---
 src/test/scala/chiselTests/IntervalSpec.scala | 59 ++++++++++++++++++++++++++-
 1 file changed, 58 insertions(+), 1 deletion(-)

(limited to 'src/test/scala/chiselTests/IntervalSpec.scala')

diff --git a/src/test/scala/chiselTests/IntervalSpec.scala b/src/test/scala/chiselTests/IntervalSpec.scala
index 863771a3..ae7fdabf 100644
--- a/src/test/scala/chiselTests/IntervalSpec.scala
+++ b/src/test/scala/chiselTests/IntervalSpec.scala
@@ -456,12 +456,69 @@ class IntervalSpec extends FreeSpec with Matchers with ChiselRunners {
           () =>
             new BasicTester {
               val x = 5.I(range"[0,4]")
-          }
+            }
         ).elaborate
       }
     }
   }
 
+  "Interval literals support to double and to BigDecimal" in {
+    val d = -7.125
+    val lit1 = d.I(3.BP)
+    lit1.litToDouble should be (d)
+
+    val d2 = BigDecimal("1232123213131123.125")
+    val lit2 = d2.I(3.BP)
+    lit2.litToBigDecimal should be (d2)
+
+    // Numbers that are too big will throw exception
+    intercept[ChiselException] {
+      lit2.litToDouble
+    }
+  }
+
+  "Interval literals creation handles edge cases" - {
+    "value at closed boundaries works" in {
+      val inputRange = range"[-6, 6].2"
+      val in1 = (-6.0).I(inputRange)
+      val in2 = 6.0.I(inputRange)
+      BigDecimal(in1.litValue()) / (1 << inputRange.binaryPoint.get) should be (-6)
+      BigDecimal(in2.litValue()) / (1 << inputRange.binaryPoint.get) should be (6)
+      intercept[ChiselException] {
+        (-6.25).I(inputRange)
+      }
+      intercept[ChiselException] {
+        (6.25).I(inputRange)
+      }
+    }
+    "value at open boundaries works" in {
+      val inputRange = range"(-6, 6).2"
+      val in1 = (-5.75).I(inputRange)
+      val in2 = 5.75.I(inputRange)
+      BigDecimal(in1.litValue()) / (1 << inputRange.binaryPoint.get) should be (-5.75)
+      BigDecimal(in2.litValue()) / (1 << inputRange.binaryPoint.get) should be (5.75)
+      intercept[ChiselException] {
+        (-6.0).I(inputRange)
+      }
+      intercept[ChiselException] {
+        (6.0).I(inputRange)
+      }
+    }
+    "values not precisely at open boundaries works but are converted to nearest match" in {
+      val inputRange = range"(-6, 6).2"
+      val in1 = (-5.95).I(inputRange)
+      val in2 = 5.95.I(inputRange)
+      BigDecimal(in1.litValue()) / (1 << inputRange.binaryPoint.get) should be (-5.75)
+      BigDecimal(in2.litValue()) / (1 << inputRange.binaryPoint.get) should be (5.75)
+      intercept[ChiselException] {
+        (-6.1).I(inputRange)
+      }
+      intercept[ChiselException] {
+        (6.1).I(inputRange)
+      }
+    }
+  }
+
   "Let's take a look at the results of squeeze over small range" in {
     assertTesterPasses {
       new ClipSqueezeWrapDemo(
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