Unsigned 64b shl does not work for values above 32

[Wh1teDuke]

let i: uint64 = 1 shl 50

equals to 0. Declaring 1 and 50 as uint64 does not affect the result.

---

nim -v

Nim Compiler Version 0.11.3 (2015-07-15) [Windows: i386]
Copyright (c) 2006-2015 by Andreas Rumpf

git hash: 6c8e9da9ee8173091931980b64aa21a839fc1424

[Araq]

Produces 1125899906842624 for me.

[Wh1teDuke]

What exactly do you need? i'm under winXP 32b. Still getting the same result (in case you were wondering if i typed it wrongly):

let a: uint64 = 1 shl 31
let b: uint64 = 1 shl 50
echo a        # outputs: 2147483648
echo b        # outputs: 0

(could be somewhat related to #3028)

[Araq]

I'm on Windows 7, 32 bit. Maybe you use a different GCC version?

[matkuki]

Tried on Windows XP 32-bit, I get the same result as Abrasax!
Nim: 0.11.3 (2015-07-15)
gcc: i686-win32-dwarf-rev1, Built by MinGW-W64 project, 4.9.1 (installs with the Nim installer)

[Wh1teDuke]

gcc -v:
gcc version 5.1.0 (i686-posix-dwarf-rev0, Built by MinGW-W64 project)

[Wh1teDuke]

proc foo =
  var
   a: uint64 = 1
   b: uint64 = 50
  let i: uint64 = a shl b
  assert i != 0
  echo i

foo()

Here, the assertion doesn't fail, but echo outputs 0. My former snippet does not pass the assertion

On the other hand, let i: uint64 = 1 shl 50 generates this c code: i_93005 = 0ULL;
whereas let a: uint64 = 1 shl 31: a_93004 = 2147483648ULL;

[Araq]

I use GCC version 4.8.1. Maybe that's the reason?

[ReneSac]

For me it is working fine on Linux 64bit. GCC 4.9.1 here. Per last Abrasax- comment, it don't seems a GCC problem if the generated C code already has i_93005 = 0ULL; in it. For me it generates properly b_92056 = 1125899906842624ULL;

When I try to cross-compile a 32bit binary with nim c --cpu:i386 --passC:-m32 --passL:-m32 --parallelBuild:1 test.nim I get the error:

/usr/include/features.h:374:25: fatal error: sys/cdefs.h: No such file or directory
 #  include <sys/cdefs.h>

So I could not test it.

[matkuki]

Araq:
Just tried GCC-4.8.1 on Windows XP 32-bit with the code:

let i: uint64 = 1 shl 50
echo i

It echoes 0 , same as GCC-4.9.1, which I used last time.

[Wh1teDuke]

@Araq i don't have this problem anymore. May i close it?

>nim -v
Nim Compiler Version 0.12.0 (2015-10-28) [Windows: i386]
Copyright (c) 2006-2015 by Andreas Rumpf

git hash: 22a702868bfd242ff76bf86ea00a278f979a112e
active boot switches: -d:release