Pete Cooper
28b0dda32e
Handle dead defs in the if converter.
...
We had code such as this:
r2 = ...
t2Bcc
label1:
ldr ... r2
label2;
return r2<dead, def>
The if converter was transforming this to
r2<def> = ...
return [pred] r2<dead,def>
ldr <r2, kill>
return
which fails the machine verifier because the ldr now reads from a dead def.
The fix here detects dead defs in stepForward and passes them back to the caller in the clobbers list. The caller then clears the dead flag from the def is the value is live.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@236660 91177308-0d34-0410-b5e6-96231b3b80d8
2015-05-06 22:51:04 +00:00
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