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aec693ab31
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3 Commits

Author SHA1 Message Date
Michael Liao
aec693ab31 Enhance boolean simplification to handle 16-/64-bit RDRAND 
- RDRAND always clears the destination value when a random value is not
  available (i.e. CF == 0). This value is truncated or zero-extended as
  the false boolean value to be returned. Boolean simplification needs
  to skip this 'zext' or 'trunc' node.

llvm-svn: 178312
 2013-03-28 23:38:52 +00:00
Michael Liao
2791a08d7e Add boolean simplification support from CMOV 
- If a boolean value is generated from CMOV and tested as boolean value,
  simplify the use of test result by referencing the original condition.
  RDRAND intrinisc is one of such cases.

llvm-svn: 163516
 2012-09-10 16:36:16 +00:00
Michael Liao
97334a5c5f add X86-specific DAG optimization to simplify boolean test 
- if a boolean test (X86ISD::CMP or X86ISD:SUB) checks a boolean value
  generated from X86ISD::SETCC, try to simplify the boolean value
  generation and checking by reusing the original EFLAGS with proper
  condition code
- add hooks to X86 specific SETCC/BRCOND/CMOV, the major 3 places
  consuming EFLAGS

part of patches fixing PR12312

llvm-svn: 161687
 2012-08-10 19:58:13 +00:00