[LLVMdev] Can't bootstrap llvm-gcc-4.0 for x84_64

[Chris Lattner]

On Mon, 8 Oct 2007, Evan Cheng wrote:
> I am turning 32-bit add into 32-bit LEA on x86-64 but that's
> perfectly legal. Both
> leal (%esi,%edi), %eax
> leal (%rsi,%rdi), %eax
> are legal assembly. It's just the former requires a 67H prefix due to
> the 32-bit address size.
>
> This does point to a performance problem in the 3 address conversion
> code (which I will fix), but it should not cause the assembler to
> complain.

Thanks for fixing this.  IIRC, some versions of GAS don't support the less 
efficient encoding at all.  In any case, this should be fixed.  Dave, can 
you verify bootstrap works now?

-Chris

>>>> I also see warnings like this:
>>>>
>>>> [x86_64-mod-dbg]: ./xgcc -B./
>>>> -B/install.modified.debug/x86_64-unknown-linux-gnu/x86_64-unknown-
>>>> linux-gnu/bin/
>>>> -isystem /install.modified.debug/x86_64-unknown-linux-gnu/x86_64-
>>>> unknown-linux-gnu/include
>>>> -isystem /install.modified.debug/x86_64-unknown-linux-gnu/x86_64-
>>>> unknown-linux-gnu/sys-include
>>>> -L/tmp/ptmp/dag/build.llvm-gcc-4.0.modified.debug/x86_64-unknown-
>>>> linux-gnu/gcc/../ld
>>>> -O2  -DIN_GCC    -W -Wall -Wwrite-strings -Wstrict-prototypes
>>>> -Wmissing-prototypes -Wold-style-definition  -isystem ./include  -
>>>> fPIC -g
>>>> -DHAVE_GTHR_DEFAULT -DIN_LIBGCC2 -D__GCC_FLOAT_NOT_NEEDED  -I. -I.
>>>> -I/llvm-project.modified/llvm-gcc-4.0/trunk/gcc
>>>> -I/llvm-project.modified/llvm-gcc-4.0/trunk/gcc/.
>>>> -I/llvm-project.modified/llvm-gcc-4.0/trunk/gcc/../include
>>>> -I/llvm-project.modified/llvm-gcc-4.0/trunk/gcc/../libcpp/include
>>>> -I/llvm-project.modified/llvm/trunk/include
>>>> -I/ptmp/dag/build.llvm.modified.debug/x86_64-unknown-linux-gnu/
>>>> include
>>>> -DL_absvdi2 -c /llvm-project.modified/llvm-gcc-4.0/trunk/gcc/
>>>> libgcc2.c -o
>>>> libgcc/./_absvdi2.o
>>>> [x86_64-mod-dbg]: WARNING: 128-bit integers not supported!
>>>>
>>>> This is from the latest trunk.  Is anyone else seeing this problem?
>>>>
>>>>                                                -Dave
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>>
>> -Chris
>>
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>

-Chris

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