[llvm] r176490 - Add a test that .align directives on capable processors use long NOPs.

[Benjamin Kramer]

On 05.03.2013, at 18:49, Chad Rosier <mcrosier at apple.com> wrote:

> David,
> This is failing for me locally with the following error:
> 
> /Users/mcrosier/llvm-clean/llvm/test/MC/X86/x86_long_nop.s:6:8: error: invalid alignment value
> .align 32
> 
> Does the .align directive expect log base 2 of the byte alignment (i.e., .align 5)?

Depends on the platform, it's log2 on darwin and byte alignment on most ELF platforms.

.p2align and .balign are portable alternatives.

- Ben

>  Chad
> 
> On Mar 5, 2013, at 8:46 AM, David Sehr <sehr at google.com> wrote:
> 
>> Author: sehr
>> Date: Tue Mar  5 10:46:54 2013
>> New Revision: 176490
>> 
>> URL: http://llvm.org/viewvc/llvm-project?rev=176490&view=rev
>> Log:
>> Add a test that .align directives on capable processors use long NOPs.
>> 
>> Added:
>>    llvm/trunk/test/MC/X86/x86_long_nop.s
>> 
>> Added: llvm/trunk/test/MC/X86/x86_long_nop.s
>> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/MC/X86/x86_long_nop.s?rev=176490&view=auto
>> ==============================================================================
>> --- llvm/trunk/test/MC/X86/x86_long_nop.s (added)
>> +++ llvm/trunk/test/MC/X86/x86_long_nop.s Tue Mar  5 10:46:54 2013
>> @@ -0,0 +1,12 @@
>> +# RUN: llvm-mc -filetype=obj -arch=x86 -mcpu=i686 %s | llvm-objdump -d -no-show-raw-insn - | FileCheck %s
>> +
>> +# Ensure alignment directives also emit sequences of 15-byte NOPs on processors
>> +# capable of using long NOPs.
>> +inc %eax
>> +.align 32
>> +inc %eax
>> +# CHECK: 0:  inc
>> +# CHECK-NEXT: 1:  nop
>> +# CHECK-NEXT: 10:  nop
>> +# CHECK-NEXT: 1f:  nop
>> +# CHECK-NEXT: 20:  inc
>> 
>> 
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