Displaying 5 results from an estimated 5 matches for "k6_2".
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6_2
2013 Nov 07
2
[LLVMdev] [PATCH] Do not generate nopl instruction on CPUs that don't support it.
On Tue, 5 Nov 2013, Rafael Espíndola wrote:
> Please include a testcase with the patch.
I'm sending testcase here. Compile it with
"clang -O2 -march=k6-2 -c loop.c"
> gas uses " nopl 0x0(%eax)" for k6_2. Are you sure it is a gas bug?
Yes, it is gas bug. I should report it to binutils maintainers.
Mikulas
> On 3 November 2013 13:50, Mikulas Patocka
> <mikulas at artax.karlin.mff.cuni.cz> wrote:
> > Hi
> >
> > This patch fixes code generation bug - 586-class CPUs don...
2013 Nov 12
0
[LLVMdev] [PATCH] Do not generate nopl instruction on CPUs that don't support it.
...ere. Compile it with
> "clang -O2 -march=k6-2 -c loop.c"
The test should be in the patch itself. It can use llvm-mc to check
how the nops are expanded. The trick used by
MachO/x86_32-optimal_nop.s is to use '.align X, 0x90'.
>> gas uses " nopl 0x0(%eax)" for k6_2. Are you sure it is a gas bug?
>
> Yes, it is gas bug. I should report it to binutils maintainers.
Thanks!
Cheers,
Rafael
2013 Nov 22
1
[LLVMdev] [PATCH] Do not generate nopl instruction on CPUs that don't support it.
...e nops are expanded. The trick used by
> MachO/x86_32-optimal_nop.s is to use '.align X, 0x90'.
So put it there and commit it to llvm codebase. I'm not an expert in llvm,
I just needed a patch to make it work on my computer.
> >> gas uses " nopl 0x0(%eax)" for k6_2. Are you sure it is a gas bug?
> >
> > Yes, it is gas bug. I should report it to binutils maintainers.
>
> Thanks!
>
> Cheers,
> Rafael
I already reported it to binutils maintainers and they fixed it.
Mikulas
2013 Nov 05
0
[LLVMdev] [PATCH] Do not generate nopl instruction on CPUs that don't support it.
Please include a testcase with the patch.
gas uses " nopl 0x0(%eax)" for k6_2. Are you sure it is a gas bug?
On 3 November 2013 13:50, Mikulas Patocka
<mikulas at artax.karlin.mff.cuni.cz> wrote:
> Hi
>
> This patch fixes code generation bug - 586-class CPUs don't support the
> nopl instruction and some 686-class CPUs don't support it too.
>
>...
2013 Nov 03
2
[LLVMdev] [PATCH] Do not generate nopl instruction on CPUs that don't support it.
Hi
This patch fixes code generation bug - 586-class CPUs don't support the
nopl instruction and some 686-class CPUs don't support it too.
I created bug 17792 for that.
BTW. I think you should also optimize padding on these CPUs - instead of a
stream of 0x90 nops, you should generate variants of "lea (%esi), %esi"
instruction like gcc.
This patch disables generation of