9 Commits

Author	SHA1	Message	Date
Evan Cheng	ddeb9d11fe	Fix for PR12090: clear def maps of aliases when visiting a copy. e.g. ... %S5<def> = COPY %S0<kill> First clear def map of Q1, etc. No small test case available. llvm-svn: 151574	2012-02-27 21:46:42 +00:00
Evan Cheng	63618f9ba6	Fix machine-cp by having it to check sub-register indicies. e.g. ... ecx = mov eax al = mov ch The second copy is not a nop because the sub-indices of ecx,ch is not the same of that of eax/al. Re-enabled machine-cp. PR11940 llvm-svn: 151002	2012-02-20 23:28:17 +00:00
Jakob Stoklund Olesen	938b4d26f1	Erase dead copies that are clobbered by a call. ... This does make a difference, at least when using RABasic. llvm-svn: 150118	2012-02-09 00:19:08 +00:00
Jakob Stoklund Olesen	8610a59de1	Handle register masks in MachineCopyPropagation. ... For simplicity, treat calls with register masks as basic block boundaries. This means we can't copy propagate callee-saved registers across calls, but I don't think that is a big deal. llvm-svn: 150108	2012-02-08 22:37:35 +00:00
Andrew Trick	1fa5bcbe2a	Codegen pass definition cleanup. No functionality. ... Moving toward a uniform style of pass definition to allow easier target configuration. Globally declare Pass ID. Globally declare pass initializer. Use INITIALIZE_PASS consistently. Add a call to the initializer from CodeGen.cpp. Remove redundant "createPass" functions and "getPassName" methods. While cleaning up declarations, cleaned up comments (sorry for large diff). llvm-svn: 150100	2012-02-08 21:23:13 +00:00
Andrew Trick	9e761997d8	whitespace ... llvm-svn: 150094	2012-02-08 21:22:43 +00:00
Jakob Stoklund Olesen	8c139a5125	Clear kill flags before propagating a copy. ... The live range of the source register may be extended when a redundant copy is eliminated. Make sure any kill flags between the two copies are cleared. This fixes PR11765. llvm-svn: 149069	2012-01-26 17:52:15 +00:00
Evan Cheng	520730ff23	Avoid eraseing copies from a reserved register unless the definition can be ... safely proven not to have been clobbered. No small test case possible. llvm-svn: 147751	2012-01-08 19:52:28 +00:00
Evan Cheng	00b1a3cd7e	Added a late machine instruction copy propagation pass. This catches ... opportunities that only present themselves after late optimizations such as tail duplication .e.g. ## BB#1: movl %eax, %ecx movl %ecx, %eax ret The register allocator also leaves some of them around (due to false dep between copies from phi-elimination, etc.) This required some changes in codegen passes. Post-ra scheduler and the pseudo-instruction expansion passes have been moved after branch folding and tail merging. They were before branch folding before because it did not always update block livein's. That's fixed now. The pass change makes independently since we want to properly schedule instructions after branch folding / tail duplication. rdar://10428165 rdar://10640363 llvm-svn: 147716	2012-01-07 03:02:36 +00:00