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3 Commits

Author SHA1 Message Date
Alexey Volkov 302309f39f [X86] Limit maximum nop length on Silvermont 
Silvermont can only decode one instruction per cycle if the instruction exceeds 8 bytes.
Also in Silvermont instructions with more than 3 prefixes will cause 3 cycle penalty.
Maximum nop length is limited to 7 bytes when used for padding on Silvermont.
For other x86 processors max nop length remains unchanged 15 bytes.

Differential Revision: http://reviews.llvm.org/D4374

llvm-svn: 212321
 2014-07-04 07:14:56 +00:00
Eli Bendersky 59d7cb2386 Fixes a test by replacing .align by .p2align and setting triples explicitly. 
Patch by David Sehr

llvm-svn: 176502
 2013-03-05 18:56:14 +00:00
David Sehr af76f18fc3 Add a test that .align directives on capable processors use long NOPs. 
llvm-svn: 176490
 2013-03-05 16:46:54 +00:00