Hi Eric,
Here's the C code (example.c):
include <stdio.h>
int main()
{
printf("testing\n");
}
Here's the LLVM IR (from llvm-gcc):
ModuleID = 'example.c'
target datalayout
"e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"
target triple = "x86_64-apple-darwin11.0"
@.str = private constant [8 x i8] c"testing\00", align 1 ; <[8 x
i8]*>
[#uses=1]
define i32 @main() nounwind ssp {
entry:
%retval = alloca i32 ; <i32*> [#uses=1]
%"alloca point" = bitcast i32 0 to i32 ; <i32>
[#uses=0]
%0 = call i32 @puts(i8* getelementptr inbounds ([8 x i8]* @.str, i64 0,
i64 0)) nounwind ; <i32> [#uses=0]
br label %return
return: ; preds = %entry
%retval1 = load i32* %retval ; <i32> [#uses=1]
ret i32 %retval1
}
declare i32 @puts(i8*)
And when I run llc with this IR I get nothing printed on screen. Not sure
if my LLVM revision is corrupted and needs a fresh install. When I ran with
the bitcode and lli here's what I get:
42-105-250-151:pastebin Babai$ llvm-gcc example.c -c -emit-llvm -o
example.bc
42-105-250-151:pastebin Babai$ lli example.bc
lli: example.bc: Invalid ALLOCA record
Pretty confusing.
Thanks,
Arpan
On Mon, Feb 6, 2012 at 6:16 AM, Eric Christopher <echristo at apple.com>
wrote:
>
> On Feb 5, 2012, at 11:32 AM, Arpan Sen wrote:
>
> For the very simple example below, I get *Unknown instruction error from
> lli and llvm-dis*, while* llc does not print anything*. Not sure what is
> that I am missing here. My llvm-gcc version
> is i686-apple-darwin11-llvm-gcc-4.2 (GCC) 4.2.1 (Based on Apple Inc. build
> 5658) (LLVM build 2336.1.00)
>
>
> 1-39-155-188:pastebin Babai$ llvm-gcc example.c -emit-llvm -c -o example.bc
>
> Any ideas?
>
>
> On which instruction is illegal? Not offhand, but you can use llvm-gcc -S
> -emit-llvm example.c -o example.ll to get an llvm bitcode file as text and
> take a look.
>
> -eric
>
>
--
Regards,
Arpan
-----------------------------------------------------------------------------------------------------------------
Reality is merely an illusion, albeit a very persistent one.
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Works for me: [jhereg:~/tmp] echristo% /Volumes/Data/builds/build-llvm/Debug+Asserts/bin/clang -S -emit-llvm foo.cpp [jhereg:~/tmp] echristo% lli foo.s testing [jhereg:~/tmp] echristo% llvm-gcc -S -emit-llvm foo.cpp [jhereg:~/tmp] echristo% lli foo.s testing the first is using top of tree clang. The second is using an llvm-gcc on my OS. What versions are you using? -eric On Feb 6, 2012, at 9:10 AM, Arpan Sen <arpansen at gmail.com> wrote:> Hi Eric, > > Here's the C code (example.c): > include <stdio.h> > > int main() > { > printf("testing\n"); > } > > Here's the LLVM IR (from llvm-gcc): > ModuleID = 'example.c' > target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64" > target triple = "x86_64-apple-darwin11.0" > > @.str = private constant [8 x i8] c"testing\00", align 1 ; <[8 x i8]*> [#uses=1] > > define i32 @main() nounwind ssp { > entry: > %retval = alloca i32 ; <i32*> [#uses=1] > %"alloca point" = bitcast i32 0 to i32 ; <i32> [#uses=0] > %0 = call i32 @puts(i8* getelementptr inbounds ([8 x i8]* @.str, i64 0, i64 0)) nounwind ; <i32> [#uses=0] > br label %return > > return: ; preds = %entry > %retval1 = load i32* %retval ; <i32> [#uses=1] > ret i32 %retval1 > } > > declare i32 @puts(i8*) > > And when I run llc with this IR I get nothing printed on screen. Not sure if my LLVM revision is corrupted and needs a fresh install. When I ran with the bitcode and lli here's what I get: > 42-105-250-151:pastebin Babai$ llvm-gcc example.c -c -emit-llvm -o example.bc > 42-105-250-151:pastebin Babai$ lli example.bc > lli: example.bc: Invalid ALLOCA record > > Pretty confusing. > > Thanks, > Arpan > > > On Mon, Feb 6, 2012 at 6:16 AM, Eric Christopher <echristo at apple.com> wrote: > > On Feb 5, 2012, at 11:32 AM, Arpan Sen wrote: > >> For the very simple example below, I get Unknown instruction error from lli and llvm-dis, while llc does not print anything. Not sure what is that I am missing here. My llvm-gcc version is i686-apple-darwin11-llvm-gcc-4.2 (GCC) 4.2.1 (Based on Apple Inc. build 5658) (LLVM build 2336.1.00) > >> 1-39-155-188:pastebin Babai$ llvm-gcc example.c -emit-llvm -c -o example.bc >> >> Any ideas? > > On which instruction is illegal? Not offhand, but you can use llvm-gcc -S -emit-llvm example.c -o example.ll to get an llvm bitcode file as text and take a look. > > -eric > > > > > -- > Regards, > Arpan > ----------------------------------------------------------------------------------------------------------------- > Reality is merely an illusion, albeit a very persistent one.
> And when I run llc with this IR I get nothing printed on screen. Not sure if my > LLVM revision is corrupted and needs a fresh install. When I ran with the > bitcode and lli here's what I get: > 42-105-250-151:pastebin Babai$ llvm-gcc example.c -c -emit-llvm -o example.bc > 42-105-250-151:pastebin Babai$ lli example.bc > lli: example.bc: Invalid ALLOCA recordMismatch between the LLVM versions of llvm-gcc and lli? Ciao, Duncan.