From 797cb2e67b084f28474cc5d4251e57275c1e8f5f Mon Sep 17 00:00:00 2001
From: Bung <crc32@qq.com>
Date: Fri, 13 Nov 2020 20:44:48 +0800
Subject: Fix #8404 JS backend doesn't handle float->int type conversion
 (#15950) [backport]

* Fix #8404 JS backend doesn't handle float->int type conversion
* handle conv to uint as cast, discard other cases
* limit to int32, times use int64
* toInt including tyInt64 break times timezones lib, ignore for now
* also affect to vm
* move to tests/misc/t8404.nim
---
 compiler/jsgen.nim | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

(limited to 'compiler')

diff --git a/compiler/jsgen.nim b/compiler/jsgen.nim
index 357e18000..34ebd306a 100644
--- a/compiler/jsgen.nim
+++ b/compiler/jsgen.nim
@@ -2208,11 +2208,17 @@ proc genConv(p: PProc, n: PNode, r: var TCompRes) =
   if dest.kind == src.kind:
     # no-op conversion
     return
-  case dest.kind:
-  of tyBool:
+  let toInt = (dest.kind in tyInt..tyInt32)
+  let fromInt = (src.kind in tyInt..tyInt32)
+  let toUint = (dest.kind in tyUInt..tyUInt32)
+  let fromUint = (src.kind in tyUInt..tyUInt32)
+  if toUint and (fromInt or fromUint):
+    let trimmer = unsignedTrimmer(dest.size)
+    r.res = "($1 $2)" % [r.res, trimmer]
+  elif dest.kind == tyBool:
     r.res = "(!!($1))" % [r.res]
     r.kind = resExpr
-  of tyInt:
+  elif toInt:
     r.res = "(($1)|0)" % [r.res]
   else:
     # TODO: What types must we handle here?
-- 
cgit 1.4.1-2-gfad0