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llvm-svn: 1501
This commit is contained in:
Ruchira Sasanka 2002-01-08 16:31:28 +00:00
parent bc28455806
commit f9dbd3926f
1 changed files with 17 additions and 2 deletions
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19
llvm/docs/RegisterAllocatorInfo.txt
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@ -173,10 +173,25 @@ allocation (e.g., caller saving code)
7. Furture work
---------------
===============
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
be rewritten. Methods defined in class MachineRegInfo must be provided for
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