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

…

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

…

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

…

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

…

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

…

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

…

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

…