Jakob Stoklund Olesen 28526a6248 Don't crash on extra evil irreducible control flow.
When the CFG contains a loop with multiple entry blocks, the traces
computed by MachineTraceMetrics don't always have the same nice
properties. Loop back-edges are normally excluded from traces, but
MachineLoopInfo doesn't recognize loops with multiple entry blocks, so
those back-edges may be included.

Avoid asserting when that happens by adding an isEarlierInSameTrace()
function that accurately determines if a dominating block is part of the
same trace AND is above the currrent block in the trace.

llvm-svn: 165434
2012-10-08 22:06:44 +00:00
2012-10-08 16:39:34 +00:00
2012-10-08 16:37:04 +00:00
2012-10-08 16:39:34 +00:00
2012-10-08 16:39:34 +00:00
2012-10-08 16:40:38 +00:00
2012-04-03 23:09:22 +00:00
2012-07-11 17:34:12 +00:00

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Fork of llvm with experimental commits and workarounds for RPCS3
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