Sanjay Patel e7f59bf4cc [InstCombine] sink sext after ashr ... Narrow ops are better for bit-tracking, and in the case of vectors, may enable better codegen. As the trunc test shows, this can allow follow-on simplifications. There's a block of code in visitTrunc that deals with shifted ops with FIXME comments. It may be possible to remove some of that now, but I want to make sure there are no problems with this step first. http://rise4fun.com/Alive/Y3a Name: hoist_ashr_ahead_of_sext_1 %s = sext i8 %x to i32 %r = ashr i32 %s, 3 ; shift value is < than source bit width => %a = ashr i8 %x, 3 %r = sext i8 %a to i32 Name: hoist_ashr_ahead_of_sext_2 %s = sext i8 %x to i32 %r = ashr i32 %s, 8 ; shift value is >= than source bit width => %a = ashr i8 %x, 7 ; so clamp this shift value %r = sext i8 %a to i32 Name: junc_the_trunc %a = sext i16 %v to i32 %s = ashr i32 %a, 18 %t = trunc i32 %s to i16 => %t = ashr i16 %v, 15 llvm-svn: 310942		2017-08-15 18:25:52 +00:00
..
Coroutines	Remove inline keyword from inline classof methods	2017-06-29 19:35:17 +00:00
Hello
InstCombine	[InstCombine] sink sext after ashr	2017-08-15 18:25:52 +00:00
Instrumentation	Add missing dependency in ICP. (NFC)	2017-08-14 23:25:21 +00:00
IPO	Add strictfp attribute to prevent unwanted optimizations of libm calls	2017-08-14 21:15:13 +00:00
ObjCARC	Sort the remaining #include lines in include/... and lib/....	2017-06-06 11:49:48 +00:00
Scalar	[Dominators] Include infinite loops in PostDominatorTree	2017-08-15 18:14:57 +00:00
Utils	[LV] Minor savings to Sink casts to unravel first order recurrence	2017-08-15 08:32:59 +00:00
Vectorize	Fix -Wunused-lambda-capture for Release build.	2017-08-15 17:39:35 +00:00
CMakeLists.txt
LLVMBuild.txt