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3 Commits

Author SHA1 Message Date
Jakob Stoklund Olesen 6039983755 Fix undefined code and reenable test case. 
I don't think the compact encoding code is right, but at least is has
defined behavior now.

llvm-svn: 147938
 2012-01-11 09:08:04 +00:00
Jakob Stoklund Olesen 05ff7f06fb Disable test that seems to expose an unrelated Linux issue. 
llvm-svn: 147921
 2012-01-11 03:42:27 +00:00
Jakob Stoklund Olesen 8b1d023a4a Detect when a value is undefined on an edge to a landing pad. 
Consider this code:

int h() {
  int x;
  try {
    x = f();
    g();
  } catch (...) {
    return x+1;
  }
  return x;
}

The variable x is undefined on the first edge to the landing pad, but it
has the f() return value on the second edge to the landing pad.

SplitAnalysis::getLastSplitPoint() would assume that the return value
from f() was live into the landing pad when f() throws, which is of
course impossible.

Detect these cases, and treat them as if the landing pad wasn't there.
This allows spill code to be inserted after the function call to f().

<rdar://problem/10664933>

llvm-svn: 147912
 2012-01-11 02:07:05 +00:00