2 Commits

Author	SHA1	Message	Date
Evan Cheng	09f5be8146	Turn a 2-address instruction into a 3-address one when it's profitable even if the two-address operand is killed. ... e.g. %reg1024<def> = MOV r1 %reg1025<def> = ADD %reg1024, %reg1026 r0 = MOV %reg1025 If it's not possible / profitable to commute ADD, then turning ADD into a LEA saves a copy. llvm-svn: 68065	2009-03-30 21:34:07 +00:00
Evan Cheng	968c3b0d6e	Model inline asm constraint which ties an input to an output register as machine operand TIED_TO constraint. This eliminated the need to pre-allocate registers for these. This also allows register allocator can eliminate the unneeded copies. ... llvm-svn: 67512	2009-03-23 08:01:15 +00:00