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Author SHA1 Message Date
Nadav Rotem a136939fa9 Reapply r162160 with a fix: Optimize Arith->Trunc->SETCC sequence to allow better compare/branch code. 
llvm-svn: 162172
 2012-08-18 17:53:03 +00:00
Nadav Rotem c324af609e Revert r162160 because it made a few buildbots fail. 
llvm-svn: 162164
 2012-08-18 05:02:36 +00:00
Nadav Rotem 2cb14a5c4b The X86 backend has a number of optimizations for SETCC nodes which use 
arithmetic instructions. However, when small data types are used, a truncate
node appears between the SETCC node and the arithmetic operation. This patch
adds support for this pattern.

Before:
  xorl  %esi, %edi
  testb %dil, %dil
  setne %al
  ret

After:
  xorb  %dil, %sil
  setne %al
  ret

rdar://12081007

llvm-svn: 162160
 2012-08-18 02:43:28 +00:00