[LLVMdev] Duplicate assignment in LLVM?

[Chris Lattner]

On Wed, 7 Jul 2004, Reid Spencer wrote:

> Okay, I've replicated your results, but I don't think there's an error here,
> its just not nice output from the disassembler. The first %tmp.ll is of type
> long. The second one is of type short. I think that's valid for LLVM. That
> is, the SSA form depends on both the type and name of the virtual register.
> In any event, llvm-as seems to compile the llvm-dis output just fine.

Just for confirmation, Reid is right here.  Conceptually, LLVM has a
separate symbol table for values of each type.

-Chris

> On Wed, 07 Jul 2004 12:01:15 -0400
>   "Reid Spencer" <reid at x10sys.com> wrote:
> > Okay, let me test with exactly your options and I'll let you know what I
> >get.
> >
> > Reid.
> >
> > On Wed, 7 Jul 2004 19:53:15 +0400
> >  Vladimir Prus <ghost at cs.msu.su> wrote:
> >> Reid Spencer wrote:
> >>> Volodya,
> >>>
> >>> I think you may need to update your CFE and rebuild. I compiled the test
> >>> using my local build and I didn't get the results you see below. I'm
> >>> also very surprised to see this output. The first %tmp.11 should have
> >>> been %tmp.1 .. not sure how it got corrupted. In any event, the
> >>> attachment is obviously generated by code that runs quite differently
> >>> because the virtual register names used are quite different from what
> >>> you have below. If you updated last week sometime, is it possible you
> >>> got caught between some of Chris' "determinism" changes?
> >>>
> >>> Anyway, try an update and let us know how it goes.
> >>
> >> This still happens after update and rebuild:
> >>
> >> $ /home/ghost/build/llvm-gcc/install/bin/gcc -g -S -fno-inline -o
> >>test.llvm
> >> tests/2003-05-26-Shorts.c
> >> $ gccas -disable-inlining test.llvm -o test.bc
> >> $ llvm-dis -f test.bc
> >> $ less test.ll
> >> ........
> >> int %main(int %argc, sbyte** %argv) {
> >> entry:
> >>        call void %__main( )
> >>        %tmp.11 = call ulong %getL( )           ; <ulong> [#uses=16]
> >>        %tmp.3 = cast ulong %tmp.11 to long             ; <long> [#uses=
> >> 6]
> >>        %tmp.5 = cast ulong %tmp.11 to uint             ; <uint> [#uses=
> >> 6]
> >>        %tmp.7 = cast ulong %tmp.11 to int              ; <int> [#uses=7
> >> ]
> >>        %tmp.9 = cast ulong %tmp.11 to ushort           ; <ushort> [#use
> >> s=3]
> >>        %tmp.11 = cast ulong %tmp.11 to short
> >>
> >>
> >> - Volodya
> >>
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-Chris

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