4 Commits

Author	SHA1	Message	Date
Dan Gohman	be34c35f32	Re-implement the main strength-reduction portion of LoopStrengthReduction. ... This new version is much more aggressive about doing "full" reduction in cases where it reduces register pressure, and also more aggressive about rewriting induction variables to count down (or up) to zero when doing so reduces register pressure. It currently uses fairly simplistic algorithms for finding reuse opportunities, but it introduces a new framework allows it to combine multiple strategies at once to form hybrid solutions, instead of doing all full-reduction or all base+index. llvm-svn: 94061	2010-01-21 02:09:26 +00:00
Dan Gohman	51b3e804dc	Reapply the MOV64r0 patch, with a fix: MOV64r0 clobbers EFLAGS. ... llvm-svn: 93229	2010-01-12 04:42:54 +00:00
Evan Cheng	bc84a42d7b	Revert 93158. It's breaking quite a few x86_64 tests. ... llvm-svn: 93185	2010-01-11 21:13:41 +00:00
Dan Gohman	5b79391087	Re-instate MOV64r0 and MOV16r0, with adjustments to work with the ... new AsmPrinter. This is perhaps less elegant than describing them in terms of MOV32r0 and subreg operations, but it allows the current register to rematerialize them. llvm-svn: 93158	2010-01-11 17:37:57 +00:00