Chris Lattner 2bb6f41282 Don't bother sign/zext_inreg'ing the result of an and operation if we know ...

the result does change as a result of the extend.

This improves codegen for Alpha on this testcase:

int %a(ushort* %i) {
        %tmp.1 = load ushort* %i
        %tmp.2 = cast ushort %tmp.1 to int
        %tmp.4 = and int %tmp.2, 1
        ret int %tmp.4
}

Generating:

a:
        ldgp $29, 0($27)
        ldwu $0,0($16)
        and $0,1,$0
        ret $31,($26),1

instead of:

a:
        ldgp $29, 0($27)
        ldwu $0,0($16)
        and $0,1,$0
        addl $0,0,$0
        ret $31,($26),1

btw, alpha really should switch to livein/outs for args :)


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21213 91177308-0d34-0410-b5e6-96231b3b80d8

2005-04-10 23:37:16 +00:00

..

LegalizeDAG.cpp

Teach legalize to deal with targets that don't support some SEXTLOAD/ZEXTLOADs

2005-04-10 22:54:25 +00:00

Makefile

Change Library Names Not To Conflict With Others When Installed

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

SelectionDAG.cpp

Don't bother sign/zext_inreg'ing the result of an and operation if we know

2005-04-10 23:37:16 +00:00

SelectionDAGISel.cpp

Emit BRCONDTWOWAY when possible.

2005-04-09 03:30:29 +00:00

SelectionDAGPrinter.cpp

Don't mash stuff together.

2005-01-16 07:28:31 +00:00

TargetLowering.cpp

Add a hook to find out how the target handles shift amounts that are out of

2005-01-19 03:36:14 +00:00