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5 Commits

Author SHA1 Message Date
Rafael Espindola
112bdc8929 Rename features to match what gcc and clang use. 
There is no advantage in being different and using the same names simplifies
clang a bit.

llvm-svn: 189141
 2013-08-23 20:21:34 +00:00
Michael Liao
427149cbcf Add support of RDSEED defined in AVX2 extension 
llvm-svn: 178314
 2013-03-28 23:41:26 +00:00
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