3 Commits

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