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

[Evan Cheng]

On Oct 8, 2007, at 4:26 PM, Chris Lattner wrote:

> On Mon, 8 Oct 2007, Evan Cheng wrote:
>>> [x86_64-mod-dbg]: /tmp/ccxekXCc.s: Assembler messages:
>>> [x86_64-mod-dbg]: /tmp/ccxekXCc.s:36: Error: `(%esi,%edi)' is not a
>>> valid 64
>>> bit base/index expression
>>
>> Looks like llvm is generating invalid x86-64 assembly. Can you add  
>> a -
>> emit-llvm to the xgcc line and generate a reproducible test case?
>> Please file a bugzilla report.
>
> Evan, are you "3 addrifying" 32-bit adds into a 32-bit LEA on x86-64?
> Could this be the problem? (iirc, it wants you to use eax = LEA  
> rsi, rdi)

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.

Evan

>
> -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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>>
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>
> -Chris
>
> -- 
> http://nondot.org/sabre/
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