Bill Wendling 43a6c5e2fc We have a chance for an optimization. Consider this code: ... int x(int t) { if (t & 256) return -26; return 0; } We generate this: tst.w r0, #256 mvn r0, #25 it eq moveq r0, #0 while gcc generates this: ands r0, r0, #256 it ne mvnne r0, #25 bx lr Scandalous really! During ISel time, we can look for this particular pattern. One where we have a "MOVCC" that uses the flag off of a CMPZ that itself is comparing an AND instruction to 0. Something like this (greatly simplified): %r0 = ISD::AND ... ARMISD::CMPZ %r0, 0 @ sets [CPSR] %r0 = ARMISD::MOVCC 0, -26 @ reads [CPSR] All we have to do is convert the "ISD::AND" into an "ARM::ANDS" that sets [CPSR] when it's zero. The zero value will all ready be in the %r0 register and we only need to change it if the AND wasn't zero. Easy! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112664 91177308-0d34-0410-b5e6-96231b3b80d8		2010-08-31 22:41:22 +00:00
..
Analysis	Revert r112432. It appears to be exposing a problem in the emacs build.	2010-08-31 20:58:44 +00:00
Archive	Eliminate some unnessary Path::exists() calls.	2010-05-27 20:51:54 +00:00
AsmParser	remove unions from LLVM IR. They are severely buggy and not	2010-08-28 04:09:24 +00:00
Bitcode	remove unions from LLVM IR. They are severely buggy and not	2010-08-28 04:09:24 +00:00
CodeGen	Reapply r112623. Included additional check for unused byval argument.	2010-08-31 22:22:42 +00:00
CompilerDriver	Add a TODO.	2010-08-23 19:24:12 +00:00
ExecutionEngine	Fix a comment.	2010-08-30 21:54:03 +00:00
Linker	Reapply r112091 and r111922, support for metadata linking, with a	2010-08-26 15:41:53 +00:00
MC	Allow creation of SHT_NULL sections, from Roman Divacky.	2010-08-31 17:03:33 +00:00
Support	Remove a hack that tries to understand incorrect triples from the	2010-08-30 10:57:54 +00:00
System	Some fixes for NetBSD	2010-08-31 22:38:00 +00:00
Target	We have a chance for an optimization. Consider this code:	2010-08-31 22:41:22 +00:00
Transforms	tidy up	2010-08-31 21:21:25 +00:00
VMCore	Add comments explaining why it's not necessary to include the	2010-08-30 21:18:41 +00:00
Makefile