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2 Commits

Author SHA1 Message Date
Evan Cheng dbcc4b4d4d Enable code placement optimization pass for ARM. 
llvm-svn: 114746
 2010-09-24 19:07:23 +00:00
Evan Cheng f259efde47 PHI elimination should not break back edge. It can cause some significant code placement issues. rdar://8263994 
good:
LBB0_2:
  mov     r2, r0
  . . .
  mov     r1, r2
  bne     LBB0_2

bad:
LBB0_2:
  mov     r2, r0
  . . .
@ BB#3:
  mov     r1, r2
  b       LBB0_2

llvm-svn: 111221
 2010-08-17 01:20:36 +00:00