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Author SHA1 Message Date
Hans Wennborg c9e1d99279 simplifycfg: Fix integer overflow converting switch into icmp. 
If a switch instruction has a case for every possible value of its type,
with the same successor, SimplifyCFG would replace it with an icmp ult,
but the computation of the bound overflows in that case, which inverts
the test.

Patch by Jed Davis!

llvm-svn: 179587
 2013-04-16 08:35:36 +00:00
Benjamin Kramer 8d6a8c130b SimplifyCFG: Track the number of used icmps when turning a icmp chain into a switch. If we used only one icmp, don't turn it into a switch. 
Also prevent the switch-to-icmp transform from creating identity adds, noticed by Marius Wachtler.

llvm-svn: 125056
 2011-02-07 22:37:28 +00:00
Benjamin Kramer 62aa46b852 SimplifyCFG: Also transform switches that represent a range comparison but are not sorted into sub+icmp. 
This transforms another 1000 switches in gcc.c.

llvm-svn: 124826
 2011-02-03 22:51:41 +00:00