From fef0b5a3517686ccfbd78531d297ddf91de2a680 Mon Sep 17 00:00:00 2001
From: Andreas Rumpf <rumpf_a@web.de>
Date: Wed, 27 Aug 2025 12:23:04 +0200
Subject: [PATCH] fixes #25114 (#25124)

(cherry picked from commit d472022a7701d4c3c807980cf805606f2cb26277)
---
 compiler/ast.nim     |  5 +++--
 compiler/treetab.nim | 17 +++++++++++------
 compiler/vmdef.nim   |  4 +++-
 compiler/vmgen.nim   | 22 ++++++++++++++--------
 4 files changed, 31 insertions(+), 17 deletions(-)

diff --git a/compiler/ast.nim b/compiler/ast.nim
index 13f7890bcd..a77e393720 100644
--- a/compiler/ast.nim
+++ b/compiler/ast.nim
@@ -815,6 +815,7 @@ type
                                 # nodes are compared by structure!
     counter*: int
     data*: TNodePairSeq
+    ignoreTypes*: bool
 
   TObjectSeq* = seq[RootRef]
   TObjectSet* = object
@@ -1637,8 +1638,8 @@ proc initObjectSet*(): TObjectSet =
   result = TObjectSet(counter: 0)
   newSeq(result.data, StartSize)
 
-proc initNodeTable*(): TNodeTable =
-  result = TNodeTable(counter: 0)
+proc initNodeTable*(ignoreTypes=false): TNodeTable =
+  result = TNodeTable(counter: 0, ignoreTypes: ignoreTypes)
   newSeq(result.data, StartSize)
 
 proc skipTypes*(t: PType, kinds: TTypeKinds; maxIters: int): PType =
diff --git a/compiler/treetab.nim b/compiler/treetab.nim
index 6685c4a899..1fd539f0f2 100644
--- a/compiler/treetab.nim
+++ b/compiler/treetab.nim
@@ -42,32 +42,37 @@ proc hashTree*(n: PNode): Hash =
   #echo "hashTree ", result
   #echo n
 
-proc treesEquivalent(a, b: PNode): bool =
+proc treesEquivalent(a, b: PNode; ignoreTypes: bool): bool =
   if a == b:
     result = true
   elif (a != nil) and (b != nil) and (a.kind == b.kind):
     case a.kind
-    of nkEmpty, nkNilLit, nkType: result = true
+    of nkEmpty: result = true
     of nkSym: result = a.sym.id == b.sym.id
     of nkIdent: result = a.ident.id == b.ident.id
     of nkCharLit..nkUInt64Lit: result = a.intVal == b.intVal
-    of nkFloatLit..nkFloat64Lit: result = a.floatVal == b.floatVal
+    of nkFloatLit..nkFloat64Lit:
+      result = cast[uint64](a.floatVal) == cast[uint64](b.floatVal)
+      #result = a.floatVal == b.floatVal
     of nkStrLit..nkTripleStrLit: result = a.strVal == b.strVal
+    of nkType, nkNilLit:
+      result = a.typ == b.typ
     else:
       if a.len == b.len:
         for i in 0..<a.len:
-          if not treesEquivalent(a[i], b[i]): return
+          if not treesEquivalent(a[i], b[i], ignoreTypes): return
         result = true
       else:
         result = false
-    if result: result = sameTypeOrNil(a.typ, b.typ)
+    if result and not ignoreTypes:
+      result = sameTypeOrNil(a.typ, b.typ)
   else:
     result = false
 
 proc nodeTableRawGet(t: TNodeTable, k: Hash, key: PNode): int =
   var h: Hash = k and high(t.data)
   while t.data[h].key != nil:
-    if (t.data[h].h == k) and treesEquivalent(t.data[h].key, key):
+    if (t.data[h].h == k) and treesEquivalent(t.data[h].key, key, t.ignoreTypes):
       return h
     h = nextTry(h, high(t.data))
   result = -1
diff --git a/compiler/vmdef.nim b/compiler/vmdef.nim
index f7e18d3010..1ea0c0b2a4 100644
--- a/compiler/vmdef.nim
+++ b/compiler/vmdef.nim
@@ -249,6 +249,7 @@ type
                             # to not slow down interpretation
     globals*: PNode         #
     constants*: PNode       # constant data
+    contstantTab*: TNodeTable
     types*: seq[PType]      # some instructions reference types (e.g. 'except')
     currentExceptionA*, currentExceptionB*: PNode
     exceptionInstr*: int # index of instruction that raised the exception
@@ -298,7 +299,8 @@ proc newCtx*(module: PSym; cache: IdentCache; g: ModuleGraph; idgen: IdGenerator
     prc: PProc(blocks: @[]), module: module, loopIterations: g.config.maxLoopIterationsVM,
     callDepth: g.config.maxCallDepthVM,
     comesFromHeuristic: unknownLineInfo, callbacks: @[], callbackIndex: initTable[string, int](), errorFlag: "",
-    cache: cache, config: g.config, graph: g, idgen: idgen)
+    cache: cache, config: g.config, graph: g, idgen: idgen,
+    contstantTab: initNodeTable(true))
 
 proc refresh*(c: PCtx, module: PSym; idgen: IdGenerator) =
   c.module = module
diff --git a/compiler/vmgen.nim b/compiler/vmgen.nim
index 9d829ad567..8e7d7c7b3b 100644
--- a/compiler/vmgen.nim
+++ b/compiler/vmgen.nim
@@ -33,7 +33,8 @@ when defined(nimPreviewSlimSystem):
 
 import
   ast, types, msgs, renderer, vmdef, trees,
-  magicsys, options, lowerings, lineinfos, transf, astmsgs
+  magicsys, options, lowerings, lineinfos, transf, astmsgs,
+  treetab
 
 from modulegraphs import getBody
 
@@ -478,10 +479,16 @@ proc sameConstant*(a, b: PNode): bool =
         result = true
 
 proc genLiteral(c: PCtx; n: PNode): int =
-  # types do not matter here:
-  for i in 0..<c.constants.len:
-    if sameConstant(c.constants[i], n): return i
-  result = rawGenLiteral(c, n)
+  result = nodeTableTestOrSet(c.contstantTab, n, c.constants.len)
+  if result == c.constants.len:
+    let lit = rawGenLiteral(c, n)
+    assert lit == result
+
+  when false:
+    # types do not matter here:
+    for i in 0..<c.constants.len:
+      if sameConstant(c.constants[i], n): return i
+    result = rawGenLiteral(c, n)
 
 proc unused(c: PCtx; n: PNode; x: TDest) {.inline.} =
   if x >= 0:
@@ -1549,8 +1556,7 @@ template cannotEval(c: PCtx; n: PNode) =
   if c.config.cmd == cmdCheck and c.config.m.errorOutputs != {}:
     # nim check command with no error outputs doesn't need to cascade here,
     # includes `tryConstExpr` case which should not continue generating code
-    localError(c.config, n.info, "cannot evaluate at compile time: " & 
-    n.renderTree)
+    localError(c.config, n.info, "cannot evaluate at compile time: " & n.renderTree)
     c.cannotEval = true
     return
   globalError(c.config, n.info, "cannot evaluate at compile time: " &
@@ -1888,7 +1894,7 @@ proc genCheckedObjAccess(c: PCtx; n: PNode; dest: var TDest; flags: TGenFlags) =
   c.freeTemp(objR)
 
 proc genArrAccess(c: PCtx; n: PNode; dest: var TDest; flags: TGenFlags) =
-  if n[0].typ == nil: 
+  if n[0].typ == nil:
     globalError(c.config, n.info, "cannot access array with nil type")
     return