3 Commits

Author	SHA1	Message	Date
Nadav Rotem	70409991bc	During the CodeGenPrepare we often lower intrinsics (such as objsize) ... and allow some optimizations to turn conditional branches into unconditional. This commit adds a simple control-flow optimization which merges two consecutive basic blocks which are connected by a single edge. This allows the codegen to operate on larger basic blocks. rdar://11973998 llvm-svn: 161852	2012-08-14 05:19:07 +00:00
Devang Patel	e5feef0fe1	During post RA scheduling, do not try to chase reg defs. to preserve DBG_VALUEs. This approach has several downsides, for example, it does not work when dbg value is a constant integer, it does not work if reg is defined more than once, it places end of debug value range markers in the wrong place. It even causes misleading incorrect debug info when duplicate DBG_VALUE instructions point to same reg def. ... Instead, use simpler approach and let DBG_VALUE follow its predecessor instruction. After live debug value analysis pass, all DBG_VALUE instruction are placed at the right place. Thanks Jakob for the hint! llvm-svn: 132483	2011-06-02 20:07:12 +00:00
Devang Patel	42ddaa10d3	During branch folding avoid inserting redundant DBG_VALUE machine instructions. ... llvm-svn: 132148	2011-05-26 21:47:59 +00:00