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41e431ba04
llvm/lib/Target
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Chris Lattner 41e431ba04 Teach the code generator that shrd/shld is commutable if it has an immediate. 
This allows us to generate this:

foo:
        mov %EAX, DWORD PTR [%ESP + 4]
        mov %EDX, DWORD PTR [%ESP + 8]
        shld %EDX, %EDX, 2
        shl %EAX, 2
        ret

instead of this:

foo:
        mov %EAX, DWORD PTR [%ESP + 4]
        mov %ECX, DWORD PTR [%ESP + 8]
        mov %EDX, %EAX
        shrd %EDX, %ECX, 30
        shl %EAX, 2
        ret

Note the magically transmogrifying immediate.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19686 91177308-0d34-0410-b5e6-96231b3b80d8
2005-01-19 07:11:01 +00:00
..
CBackend
PowerPC
Skeleton
Sparc
SparcV8
SparcV9 Minor changes. 2005-01-18 04:15:41 +00:00
X86 Teach the code generator that shrd/shld is commutable if it has an immediate. 2005-01-19 07:11:01 +00:00
Makefile
MRegisterInfo.cpp
Target.td
TargetData.cpp
TargetFrameInfo.cpp
TargetInstrInfo.cpp Finegrainify namespacification 2005-01-19 06:53:34 +00:00
TargetMachine.cpp
TargetMachineRegistry.cpp
TargetSchedInfo.cpp