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add a note about the red zone

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22518 91177308-0d34-0410-b5e6-96231b3b80d8
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Chris Lattner 2005-07-26 19:07:51 +00:00
parent 2e00d7d0ae
commit b65975a6ed
1 changed files with 2 additions and 0 deletions
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lib/Target/PowerPC/README.txt
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@ -3,10 +3,12 @@ TODO:
* implement do-loop -> bdnz transform * implement do-loop -> bdnz transform
* implement powerpc-64 for darwin * implement powerpc-64 for darwin
* use stfiwx in float->int * use stfiwx in float->int
* take advantage of the darwin red zone in PPC32RegisterInfo.cpp
* be able to combine sequences like the following into 2 instructions: * be able to combine sequences like the following into 2 instructions:
lis r2, ha16(l2__ZTV4Cell) lis r2, ha16(l2__ZTV4Cell)
la r2, lo16(l2__ZTV4Cell)(r2) la r2, lo16(l2__ZTV4Cell)(r2)
addi r2, r2, 8 addi r2, r2, 8
* should hint to the branch select pass that it doesn't need to print the * should hint to the branch select pass that it doesn't need to print the
second unconditional branch, so we don't end up with things like: second unconditional branch, so we don't end up with things like:
b .LBBl42__2E_expand_function_8_674 ; loopentry.24 b .LBBl42__2E_expand_function_8_674 ; loopentry.24