Evan Cheng 8a7186dbc2 Let targets provide hooks that compute known zero and ones for any_extend ... and extload's. If they are implemented as zero-extend, or implicitly zero-extend, then this can enable more demanded bits optimizations. e.g. define void @foo(i16* %ptr, i32 %a) nounwind { entry: %tmp1 = icmp ult i32 %a, 100 br i1 %tmp1, label %bb1, label %bb2 bb1: %tmp2 = load i16* %ptr, align 2 br label %bb2 bb2: %tmp3 = phi i16 [ 0, %entry ], [ %tmp2, %bb1 ] %cmp = icmp ult i16 %tmp3, 24 br i1 %cmp, label %bb3, label %exit bb3: call void @bar() nounwind br label %exit exit: ret void } This compiles to the followings before: push {lr} mov r2, #0 cmp r1, #99 bhi LBB0_2 @ BB#1: @ %bb1 ldrh r2, [r0] LBB0_2: @ %bb2 uxth r0, r2 cmp r0, #23 bhi LBB0_4 @ BB#3: @ %bb3 bl _bar LBB0_4: @ %exit pop {lr} bx lr The uxth is not needed since ldrh implicitly zero-extend the high bits. With this change it's eliminated. rdar://12771555 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@169459 91177308-0d34-0410-b5e6-96231b3b80d8		2012-12-06 01:28:01 +00:00
..
CMakeLists.txt	llvm/lib: [CMake] Add explicit dependency to intrinsics_gen.	2012-06-24 13:32:01 +00:00
DAGCombiner.cpp	Use the new script to sort the includes of every file under lib.	2012-12-03 16:50:05 +00:00
FastISel.cpp	Use the new script to sort the includes of every file under lib.	2012-12-03 16:50:05 +00:00
FunctionLoweringInfo.cpp	Use the new script to sort the includes of every file under lib.	2012-12-03 16:50:05 +00:00
InstrEmitter.cpp	Use the new script to sort the includes of every file under lib.	2012-12-03 16:50:05 +00:00
InstrEmitter.h	Sort includes for all of the .h files under the 'lib' tree. These were	2012-12-04 07:12:27 +00:00
LegalizeDAG.cpp	Use the new script to sort the includes of every file under lib.	2012-12-03 16:50:05 +00:00
LegalizeFloatTypes.cpp	Follow the same routine to add target float expansion hook	2012-10-11 07:22:01 +00:00
LegalizeIntegerTypes.cpp	Back out r166591, not sure why this made it through since I cancelled the command. Bleh, sorry about this!	2012-10-24 17:25:11 +00:00
LegalizeTypes.cpp	Use the new script to sort the includes of every file under lib.	2012-12-03 16:50:05 +00:00
LegalizeTypes.h	Sort includes for all of the .h files under the 'lib' tree. These were	2012-12-04 07:12:27 +00:00
LegalizeTypesGeneric.cpp	Fix big-endian codegen bug in DAGTypeLegalizer::ExpandRes_BITCAST	2012-10-12 15:42:58 +00:00
LegalizeVectorOps.cpp	Mark FP_EXTEND form v2f32 to v2f64 as "expand" for ARM NEON. Patch by Pete Couperus.	2012-11-17 01:52:46 +00:00
LegalizeVectorTypes.cpp	Cleanup recent addition of DAGTypeLegalizer::SplitVecOp_VSELECT	2012-11-29 19:42:09 +00:00
LLVMBuild.txt	LLVMBuild: Remove trailing newline, which irked me.	2011-12-12 19:48:00 +00:00
Makefile
ResourcePriorityQueue.cpp	Simplify code. No functionality change.	2012-12-04 01:00:52 +00:00
ScheduleDAGFast.cpp	Use the new script to sort the includes of every file under lib.	2012-12-03 16:50:05 +00:00
ScheduleDAGRRList.cpp	Use the new script to sort the includes of every file under lib.	2012-12-03 16:50:05 +00:00
ScheduleDAGSDNodes.cpp	Use the new script to sort the includes of every file under lib.	2012-12-03 16:50:05 +00:00
ScheduleDAGSDNodes.h	Add a really faster pre-RA scheduler (-pre-RA-sched=linearize). It doesn't use	2012-10-17 19:39:36 +00:00
ScheduleDAGVLIW.cpp	Use the new script to sort the includes of every file under lib.	2012-12-03 16:50:05 +00:00
SDNodeDbgValue.h	Sort includes for all of the .h files under the 'lib' tree. These were	2012-12-04 07:12:27 +00:00
SDNodeOrdering.h	Mark unimplemented copy constructors and copy assignment operators as LLVM_DELETED_FUNCTION.	2012-09-18 02:01:41 +00:00
SelectionDAG.cpp	Let targets provide hooks that compute known zero and ones for any_extend	2012-12-06 01:28:01 +00:00
SelectionDAGBuilder.cpp	Use the new script to sort the includes of every file under lib.	2012-12-03 16:50:05 +00:00
SelectionDAGBuilder.h	Sort includes for all of the .h files under the 'lib' tree. These were	2012-12-04 07:12:27 +00:00
SelectionDAGDumper.cpp	Use the new script to sort the includes of every file under lib.	2012-12-03 16:50:05 +00:00
SelectionDAGISel.cpp	Use dyn_cast instead of isa and cast. No functionality change.	2012-12-04 00:50:06 +00:00
SelectionDAGPrinter.cpp	Use the new script to sort the includes of every file under lib.	2012-12-03 16:50:05 +00:00
TargetLowering.cpp	Let targets provide hooks that compute known zero and ones for any_extend	2012-12-06 01:28:01 +00:00
TargetSelectionDAGInfo.cpp	Move TargetData to DataLayout.	2012-10-08 16:38:25 +00:00