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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@1501 91177308-0d34-0410-b5e6-96231b3b80d8
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Ruchira Sasanka 2002-01-08 16:31:28 +00:00
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19
docs/RegisterAllocatorInfo.txt
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@ -173,10 +173,25 @@ allocation (e.g., caller saving code)
7. Furture work 7. Furture work
--------------- ===============
If it is necessary to port the register allocator to another architecture If it is necessary to port the register allocator to another architecture
than Sparc, only the target specific code in ../lib/Target/Sparc needs to than Sparc, only the target specific code in ../lib/Target/Sparc needs to
be rewritten. Methods defined in class MachineRegInfo must be provided for be rewritten. Methods defined in class MachineRegInfo must be provided for
the new architecure. the new architecure.
using ReservedColorList in RegClass 7.1 Using ReservedColorList in RegClass
----------------------------------------
The register allocator allows reserving a set of registers - i.e. the reserved
registers are not used by the register allocator. Currently, there are no
reserved registers. It it is necessary to make some registers unavailable to
a particular method, this feature will become handy. To do that, the reserved
register list must be passed to the register allocator. See PhyRegAlloc.cpp
7.2 %g registers on Sparc
-------------------------
Currently, %g registers are not allocated on Sparc. If it is necessary to
allocate these %g registers, the enumeration of registers in SparcIntRegClass
in SparcRegClassInfo.h must be changed. %g registers can be easily added as
volatile registers just by moving them above in the eneumeration - see
SparcRegClassInfo.h