Manman Ren f89406ac78 CSE: allow PerformTrivialCoalescing to check copies across basic block ...

boundaries.

Given the following case:
BB0
  %vreg1<def> = SUBrr %vreg0, %vreg7
  %vreg2<def> = COPY %vreg7
BB1
  %vreg10<def> = SUBrr %vreg0, %vreg2
We should be able to CSE between SUBrr in BB0 and SUBrr in BB1.

rdar://12462006

llvm-svn: 168717

2012-11-27 18:58:41 +00:00

23 KiB

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