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7 Commits

Author SHA1 Message Date
Dan Gohman 33e6fcd56f X86_COND_C and X86_COND_NC are alternate mnemonics for 
X86_COND_B and X86_COND_AE, respectively.

llvm-svn: 61835
 2009-01-07 00:15:08 +00:00
Bill Wendling 0864a75ebf If ADD, SUB, or MUL have an overflow bit that's used, don't do transformation on 
them. The DAG combiner expects that nodes that are transformed have one value
result.

llvm-svn: 60857
 2008-12-10 22:36:00 +00:00
Bill Wendling 8008cb9a77 Implement fast-isel conversion of a branch instruction that's branching on an 
overflow/carry from the "arithmetic with overflow" intrinsics. It searches the
machine basic block from bottom to top to find the SETO/SETC instruction that is
its conditional. If an instruction modifies EFLAGS before it reaches the
SETO/SETC instruction, then it defaults to the normal instruction emission.

llvm-svn: 60807
 2008-12-09 23:19:12 +00:00
Bill Wendling e3402692d8 Change label to 'carry' for unsigned adds. 
llvm-svn: 60460
 2008-12-03 02:43:12 +00:00
Bill Wendling 30e9dc81c8 Second stab at target-dependent lowering of everyone's favorite nodes: [SU]ADDO 
- LowerXADDO lowers [SU]ADDO into an ADD with an implicit EFLAGS define. The
  EFLAGS are fed into a SETCC node which has the conditional COND_O or COND_C,
  depending on the type of ADDO requested.

- LowerBRCOND now recognizes if it's coming from a SETCC node with COND_O or
  COND_C set.

llvm-svn: 60388
 2008-12-02 01:06:39 +00:00
Bill Wendling 077eb6fcc2 XFAil test due to reverting of patch. 
llvm-svn: 60161
 2008-11-27 07:34:10 +00:00
Bill Wendling a69ced6b68 Add x86-specific test for add-with-overflow intrinsics. 
llvm-svn: 60125
 2008-11-26 22:42:19 +00:00