[LLVMdev] Simple IR example is doing a loop when there is none

Dave Pitsbawn dpitsbawn at gmail.com
Mon Mar 30 18:48:13 PDT 2015

I've copied this sample from some website and after calling llc and using
MSVC link.exe the program runs and prints "Hello world" hundreds of times
before ending with an error R6016.

Hello world
Hello world
runtime error R6016
- not enough space for thread data

I don't see a loop in the IR yet it seems to be doing just that. Any clues?

target datalayout =
 target triple = "i686-pc-win32"

%struct._OVERLAPPED = type { i32, i32, %union.anon, i8* }
%union.anon = type { %struct.anon }
%struct.anon = type { i32, i32 }

declare dllimport x86_stdcallcc i8* @"\01_GetStdHandle at 4"(i32) #1

declare dllimport x86_stdcallcc i32 @"\01_WriteFile at 20"(i8*, i8*, i32,
i32*, %struct._OVERLAPPED*) #1

@hello = internal constant [13 x i8] c"Hello world\0A\00"

define i32 @main(i32 %argc, i8** %argv) nounwind {
     %1 = call i8* @"\01_GetStdHandle at 4"(i32 -11)    ; -11 =
     %2 = call i32 @"\01_WriteFile at 20"(i8* %1, i8* getelementptr inbounds
([13 x i8], [13 x i8]* @hello, i32 0, i32 0), i32 12, i32* null,
%struct._OVERLAPPED* null)
     ; todo: Check that %4 is not equal to -1 (INVALID_HANDLE_VALUE)
     ret i32 0

 attributes #1 = { "less-precise-fpmad"="false"
"no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf"
"no-infs-fp-math"="fa lse" "no-nans-fp-math"="false"
"stack-protector-buffer-size"="8" "unsafe-fp-math"="false"
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