Chris Lattner de1c3605a6 Add a couple dag combines to transform mulhi/mullo into a wider multiply ...

when the wider type is legal.  This allows us to compile:

define zeroext i16 @test1(i16 zeroext %x) nounwind {
entry:
	%div = udiv i16 %x, 33
	ret i16 %div
}

into:

test1:                                  # @test1
	movzwl	4(%esp), %eax
	imull	$63551, %eax, %eax      # imm = 0xF83F
	shrl	$21, %eax
	ret

instead of:

test1:                                  # @test1
        movw    $-1985, %ax             # imm = 0xFFFFFFFFFFFFF83F
        mulw    4(%esp)
        andl    $65504, %edx            # imm = 0xFFE0
        movl    %edx, %eax
        shrl    $5, %eax
        ret

Implementing rdar://8760399 and example #4 from:
http://blog.regehr.org/archives/320

We should implement the same thing for [su]mul_hilo, but I don't
have immediate plans to do this.




git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121696 91177308-0d34-0410-b5e6-96231b3b80d8

2010-12-13 08:39:01 +00:00

..

CMakeLists.txt

Removed a bunch of unnecessary target_link_libraries.

2010-09-28 22:39:14 +00:00

DAGCombiner.cpp

Add a couple dag combines to transform mulhi/mullo into a wider multiply

2010-12-13 08:39:01 +00:00

FastISel.cpp

If dbg_declare() or dbg_value() is not lowered by isel then emit DEBUG message instead of creating DBG_VALUE for undefined value in reg0.

2010-12-06 22:39:26 +00:00

FunctionLoweringInfo.cpp

Reapply r112623. Included additional check for unused byval argument.

2010-08-31 22:22:42 +00:00

InstrEmitter.cpp

Reword comment slightly.

2010-12-08 22:21:42 +00:00

InstrEmitter.h

Don't set kill flags for instructions which the scheduler has cloned.

2010-05-14 22:01:14 +00:00

LegalizeDAG.cpp

Initial support for nested CALLSEQ_START/CALLSEQ_END constructs in LegalizeDAG.

2010-12-09 21:25:20 +00:00

LegalizeFloatTypes.cpp

PR5207: Rename overloaded APInt methods set(), clear(), flip() to

2010-12-01 08:53:58 +00:00

LegalizeIntegerTypes.cpp

PR5207: Change APInt methods trunc(), sext(), zext(), sextOrTrunc() and

2010-12-07 08:25:19 +00:00

LegalizeTypes.cpp

Renaming ISD::BIT_CONVERT to ISD::BITCAST to better reflect the LLVM IR concept.

2010-11-23 03:31:01 +00:00

LegalizeTypes.h

Renaming ISD::BIT_CONVERT to ISD::BITCAST to better reflect the LLVM IR concept.

2010-11-23 03:31:01 +00:00

LegalizeTypesGeneric.cpp

Renaming ISD::BIT_CONVERT to ISD::BITCAST to better reflect the LLVM IR concept.

2010-11-23 03:31:01 +00:00

LegalizeVectorOps.cpp

Renaming ISD::BIT_CONVERT to ISD::BITCAST to better reflect the LLVM IR concept.

2010-11-23 03:31:01 +00:00

LegalizeVectorTypes.cpp

Renaming ISD::BIT_CONVERT to ISD::BITCAST to better reflect the LLVM IR concept.

2010-11-23 03:31:01 +00:00

Makefile

make -fno-rtti the default unless a directory builds with REQUIRES_RTTI.

2010-01-24 20:43:08 +00:00

ScheduleDAGFast.cpp

Make fast scheduler handle asm clobbers correctly.

2010-08-17 22:17:24 +00:00

ScheduleDAGList.cpp

Trim #include.

2010-05-26 00:55:59 +00:00

ScheduleDAGRRList.cpp

Two sets of changes. Sorry they are intermingled.

2010-11-03 00:45:17 +00:00

ScheduleDAGSDNodes.cpp

Two sets of changes. Sorry they are intermingled.

2010-11-03 00:45:17 +00:00

ScheduleDAGSDNodes.h

Teach if-converter to be more careful with predicating instructions that would

2010-09-10 01:29:16 +00:00

SDNodeDbgValue.h

Merge System into Support.

2010-11-29 18:16:10 +00:00

SDNodeOrdering.h

Allow 0 as an order number. Don't assign an order to formal arguments.

2009-12-22 21:35:02 +00:00

SelectionDAG.cpp

Catch attempts to remove a deleted node from the CSE maps. Better to

2010-12-12 13:22:50 +00:00

SelectionDAGBuilder.cpp

reduce indentation by using continue, no functionality change.

2010-12-13 01:11:17 +00:00

SelectionDAGBuilder.h

When isel is emitting instructions for an x86 target without CMOV, the CFG is

2010-09-30 19:44:31 +00:00

SelectionDAGISel.cpp

Check for _setjmp too, because it's also used.

2010-11-20 00:03:09 +00:00

SelectionDAGPrinter.cpp

Eliminate unnecessary empty string literals.

2010-08-04 01:39:08 +00:00

TargetLowering.cpp

PR5207: Change APInt methods trunc(), sext(), zext(), sextOrTrunc() and

2010-12-07 08:25:19 +00:00

TargetSelectionDAGInfo.cpp

Implement a bunch more TargetSelectionDAGInfo infrastructure.

2010-05-11 17:31:57 +00:00