Chris Lattner b3ddfc42af add two dag combines: ...

(C1-X) == C2 --> X == C1-C2
(X+C1) == C2 --> X == C2-C1

This allows us to compile this:

bool %X(int %X) {
        %Y = add int %X, 14
        %Z = setne int %Y, 12345
        ret bool %Z
}

into this:

_X:
        cmpl $12331, 4(%esp)
        setne %al
        movzbl %al, %eax
        andl $1, %eax
        ret

not this:

_X:
        movl $14, %eax
        addl 4(%esp), %eax
        cmpl $12345, %eax
        setne %al
        movzbl %al, %eax
        andl $1, %eax
        ret

Testcase here: Regression/CodeGen/X86/compare-add.ll

nukage of the and coming up next.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@25898 91177308-0d34-0410-b5e6-96231b3b80d8

2006-02-02 06:36:13 +00:00

..

SelectionDAG

add two dag combines:

2006-02-02 06:36:13 +00:00

AsmPrinter.cpp

Implement smart printing of inline asm strings, handling variants and

2006-02-01 22:41:11 +00:00

BranchFolding.cpp

Remove trailing whitespace

2005-04-21 22:36:52 +00:00

DwarfWriter.cpp

Using bit size of integers instead of ambiguous "long" et all.

2006-01-27 20:31:25 +00:00

ELFWriter.cpp

add these so I can be less naughty

2005-12-28 06:29:02 +00:00

IntrinsicLowering.cpp

For PR411:

2006-01-16 21:12:35 +00:00

LiveInterval.cpp

Fix LiveInterval::getOverlapingRanges to take things in the right order

2005-10-21 06:41:30 +00:00

LiveIntervalAnalysis.cpp

Add explicit #includes of <iostream>

2006-01-22 23:41:00 +00:00

LiveVariables.cpp

Add a LiveVariables::VarInfo::dump method

2006-01-04 05:40:30 +00:00

MachineBasicBlock.cpp

Remove trailing whitespace

2005-04-21 22:36:52 +00:00

MachineCodeEmitter.cpp

mixed-STL programs are big and nasty :(

2005-12-28 02:44:35 +00:00

MachineDebugInfo.cpp

Fix build error that is apparently only a warning with some compilers.

2006-01-27 17:31:30 +00:00

MachineFunction.cpp

Allow the specification of explicit alignments for constant pool entries.

2006-01-31 22:23:14 +00:00

MachineInstr.cpp

Remove trailing whitespace

2005-04-21 22:36:52 +00:00

Makefile

Change Library Names Not To Conflict With Others When Installed

2004-10-27 23:18:45 +00:00

Passes.cpp

Alkis agrees that that iterative scan allocator isn't going to be worked on

2005-10-24 04:14:30 +00:00

PHIElimination.cpp

Add support for targets (like Alpha) that have terminator instructions which

2006-01-04 07:12:21 +00:00

PhysRegTracker.h

Improved PhysRegTracker interface. RegAlloc lazily allocates the register tracker using a std::auto_ptr

2004-02-23 06:10:13 +00:00

PrologEpilogInserter.cpp

Always compute max align.

2005-11-06 17:43:20 +00:00

RegAllocLinearScan.cpp

Add explicit #includes of <iostream>

2006-01-22 23:41:00 +00:00

RegAllocLocal.cpp

Add explicit #includes of <iostream>

2006-01-22 23:41:00 +00:00

RegAllocSimple.cpp

Add explicit #includes of <iostream>

2006-01-22 23:41:00 +00:00

TwoAddressInstructionPass.cpp

Add explicit #includes of <iostream>

2006-01-22 23:41:00 +00:00

UnreachableBlockElim.cpp

Remove trailing whitespace

2005-04-21 22:36:52 +00:00

VirtRegMap.cpp

Add explicit #includes of <iostream>

2006-01-22 23:41:00 +00:00

VirtRegMap.h

Remove trailing whitespace

2005-04-21 22:36:52 +00:00