Duncan Sands f4f47ccd12 GVN does simple propagation of conditions: when it sees a conditional ... branch "br i1 %x, label %if_true, label %if_false" then it replaces "%x" with "true" in places only reachable via the %if_true arm, and with "false" in places only reachable via the %if_false arm. Except that actually it doesn't: if value numbering shows that %y is equal to %x then, yes, %y will be turned into true/false in this way, but any occurrences of %x itself are not transformed. Fix this. What's more, it's often the case that %x is an equality comparison such as "%x = icmp eq %A, 0", in which case every occurrence of %A that is only reachable via the %if_true arm can be replaced with 0. Implement this and a few other variations on this theme. This reduces the number of lines of LLVM IR in "GCC as one big file" by 0.2%. It has a bigger impact on Ada code, typically reducing the number of lines of bitcode by around 0.4% by removing repeated compiler generated checks. Passes the LLVM nightly testsuite and the Ada ACATS testsuite. llvm-svn: 141177		2011-10-05 14:28:49 +00:00
clang	Added a flag to identify resolved overloaded function references.	2011-10-05 07:56:41 +00:00
compiler-rt	<rdar://problem/10172492> No armv4t slice of libcompiler_rt-static.a	2011-09-27 20:05:27 +00:00
debuginfo-tests	Testcase for r133065	2011-06-15 17:57:23 +00:00
libcxx	Fix <rdar://problem/10136825>	2011-10-04 23:11:56 +00:00
libcxxabi	reformatted to match Clang style; thanks to John McCall for the nudge	2011-08-15 18:06:47 +00:00
lldb	Fixed a crasher where the m_frames collection was being accessed without	2011-10-05 03:14:31 +00:00
llvm	GVN does simple propagation of conditions: when it sees a conditional	2011-10-05 14:28:49 +00:00
polly	Point to our own buildbot until the official one is up again.	2011-10-04 08:08:43 +00:00