saves/loads float Inf, NaN and NegInf literals

compiler/icnif/nifdecoder.nim

@@ -293,9 +293,23 @@ proc fromNif(c: var DecodeContext; n: var Cursor): PNode =
         inc n
     of nkFloatLit .. nkFloat128Lit:
       c.withNode n, result, kind:
-        expect n, FloatLit
-        result.floatVal = pool.floats[n.floatId]
-        inc n
+        if n.kind == FloatLit:
+          result.floatVal = pool.floats[n.floatId]
+          inc n
+        elif n.kind == ParLe:
+          case pool.tags[n.tagId]
+          of "inf":
+            result.floatVal = Inf
+          of "nan":
+            result.floatVal = NaN
+          of "neginf":
+            result.floatVal = NegInf
+          else:
+            assert false, "expected float literal but got " & pool.tags[n.tagId]
+          inc n
+          skipParRi n
+        else:
+          assert false, "expected float literal but got " & $n.kind
     of nkStrLit .. nkTripleStrLit:
       c.withNode n, result, kind:
         expect n, StringLit

tests/icnif/tencode_node2node.nim

@@ -1,4 +1,4 @@
-import std/assertions
+import std/[assertions, math]
 import "../../compiler/icnif" / [nifencoder, nifdecoder]
 import "../../compiler" / [idents, ast, astalgo, options, pathutils, modulegraphs, modules, msgs, pipelines, syntaxes, sem, llstream, lineinfos]
 
@@ -294,8 +294,25 @@ proc eql(x, y: PNode; c: var EqlContext): bool =
           debug(y.sym)
           debug(x.sym.typ)
           debug(y.sym.typ)
-      of nkCharLit .. nkTripleStrLit:
+      of nkCharLit .. nkUInt64Lit, nkStrLit .. nkTripleStrLit:
         result = sameValue(x, y)
+      of nkFloatLit .. nkFloat128Lit:
+        # want to know if x and y are identical float value.
+        # so x == y doesn't work if both x and y are NaN or x == 0 and y == -0.
+        let xc = classify(x.floatVal)
+        let yc = classify(y.floatVal)
+        if xc == yc:
+          if xc in {fcNormal, fcSubnormal}:
+            if x.floatVal != y.floatVal:
+              echo "float literal mismatch: ", x.floatVal, "/", y.floatVal
+              result = false
+            else:
+              result = true
+          else:
+            result = true
+        else:
+          echo "float literal mismatch: ", xc, "/", yc
+          result = false
       else:
         result = true
         for i in 0 ..< x.safeLen:

tests/icnif/testcode/modtestliterals.nim

@@ -23,7 +23,14 @@ var uint32litH = 4294967295'u32
 var uint64litH = 18446744073709551615'u64
 
 var floatlit = 1.25
+var floatlit2 = -1.25
 var float32lit = 1.25'f32
 var float64lit = 1.25'f64
+var floatZero = 0.0
+# Needs newer Nimony to save `-0.0` to NIF correclty
+#var floatNegZero = -0.0
+var floatInf = Inf
+var floatNaN = NaN
+var floatNegInf = NegInf
 
 var nillit: ptr int = nil