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79 lines
2.6 KiB
Plaintext
79 lines
2.6 KiB
Plaintext
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SparcV8 backend skeleton
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------------------------
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This directory houses a 32-bit SPARC V8 backend employing an expander-based
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instruction selector. It is not yet functionally complete. Watch
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this space for more news coming soon!
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Current expected test failures
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------------------------------
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Here are the currently-expected SingleSource failures for V8
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(Some C++ programs are crashing in libstdc++ at the moment;
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I'm not sure why.)
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(llc) SingleSource/Regression/C++/EH/exception_spec_test
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(llc) SingleSource/Regression/C++/EH/throw_rethrow_test
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Here are the currently-expected MultiSource failures for V8:
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(llc,cbe) MultiSource/Applications/d/make_dparser
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(llc,cbe) MultiSource/Applications/hexxagon
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(llc) MultiSource/Benchmarks/Fhourstones
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(llc,cbe) MultiSource/Benchmarks/McCat/03-testtrie
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(llc) MultiSource/Benchmarks/McCat/18-imp
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(llc,cbe) MultiSource/Benchmarks/Prolangs-C/bison/mybison
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(llc,cbe) MultiSource/Benchmarks/Prolangs-C/fixoutput
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(llc,cbe) MultiSource/Benchmarks/Prolangs-C/gnugo
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(llc,cbe) MultiSource/Benchmarks/Prolangs-C/plot2fig
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(llc,cbe) MultiSource/Benchmarks/Ptrdist/anagram
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(llc,cbe) MultiSource/Benchmarks/FreeBench/analyzer
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* DANGER * analyzer will run the machine out of VM
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(I don't know whether the following fail in cbe:)
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(llc) MultiSource/Benchmarks/FreeBench/distray
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(llc) MultiSource/Benchmarks/FreeBench/fourinarow
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(llc) MultiSource/Benchmarks/FreeBench/pifft
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(llc) MultiSource/Benchmarks/MallocBench/gs
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(llc) MultiSource/Benchmarks/Prolangs-C++/deriv1
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(llc) MultiSource/Benchmarks/Prolangs-C++/deriv2
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Known SPEC failures for V8 (probably not an exhaustive list):
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(llc) 134.perl
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(llc) 177.mesa
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(llc) 188.ammp -- FPMover bug?
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(llc) 256.bzip2
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(llc,cbe) 130.li
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(native,llc,cbe) 126.gcc
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(native,llc,cbe) 255.vortex
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To-do
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-----
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* support shl on longs (fourinarow needs this)
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* support casting 64-bit integers to FP types (fhourstones needs this)
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* support FP rem (call fmod)
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* Keep the address of the constant pool in a register instead of forming its
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address all of the time.
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* Change code like this:
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or %o0, %lo(.CPI_main_0), %o0
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ld [%o0+0], %o0
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into:
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ld [%o0+%lo(.CPI_main_0)], %o0
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for constant pool access.
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* We can fold small constant offsets into the %hi/%lo references to constant
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pool addresses as well.
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* Directly support select instructions, and fold setcc instructions into them
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where possible. I think this is what afflicts the inner loop of Olden/tsp
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(hot block = tsp():no_exit.1.i, overall GCC/LLC = 0.03).
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* Generate fsqrtd for calls to sqrt() (~ 4% speedup on Olden/tsp).
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$Date$
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