6 Commits

Author	SHA1	Message	Date
Evan Cheng	2d5be54315	Teach spiller to unfold instructions which modref spill slot when a scratch ... register is available and when it's profitable. e.g. xorq %r12<kill>, %r13 addq %rax, -184(%rbp) addq %r13, -184(%rbp) ==> xorq %r12<kill>, %r13 movq -184(%rbp), %r12 addq %rax, %r12 addq %r13, %r12 movq %r12, -184(%rbp) Two more instructions, but fewer memory accesses. It can also open up opportunities for more optimizations. llvm-svn: 69341	2009-04-17 01:29:40 +00:00
Bill Wendling	1c40c8c242	Oy! When reverting r68073, I added in experimental code. Sorry... ... llvm-svn: 68099	2009-03-31 08:41:31 +00:00
Bill Wendling	4706abded2	Revert r68073. It's causing a failure in the Apple-style builds. ... llvm-svn: 68092	2009-03-31 08:26:26 +00:00
Evan Cheng	0dccb325d1	Spiller may unfold load / mod / store instructions as an optimization when the would be loaded value is available in a register. It needs to check if it's legal to clobber the register. Also, the register can contain values of multiple spill slots, make sure to check all instead of just the one being unfolded. ... llvm-svn: 67068	2009-03-17 01:23:09 +00:00
Owen Anderson	4060191b0e	Reorganize some #include's. ... llvm-svn: 66780	2009-03-12 06:58:19 +00:00
Owen Anderson	fb5980b6ab	Reorganization: Move the Spiller out of VirtRegMap.cpp into its own files. No (intended) functionality change. ... llvm-svn: 66720	2009-03-11 22:31:21 +00:00