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https://github.com/c64scene-ar/llvm-6502.git
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8b88d906a2
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@15307 91177308-0d34-0410-b5e6-96231b3b80d8
68 lines
2.3 KiB
Plaintext
68 lines
2.3 KiB
Plaintext
Currently unimplemented:
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* cast fp to bool
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* signed right shift of long by reg
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Current bugs:
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* large fixed-size allocas not correct, although should
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be closer to working. Added code in PPCRegisterInfo.cpp
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to do >16bit subtractions to the stack pointer.
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* ulong to double. ahhh, here's the problem:
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floatdidf assumes signed longs. so if the high but of a ulong
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just happens to be set, you get the wrong sign. The fix for this
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is to call cmpdi2 to compare against zero, if so shift right by one,
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convert to fp, and multiply by (add to itself). the sequence would
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look like:
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{r3:r4} holds ulong a;
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li r5, 0
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li r6, 0 (set r5:r6 to ulong 0)
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call cmpdi2 ==> sets r3 <, =, > 0
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if r3 > 0
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call floatdidf as usual
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else
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shift right ulong a, 1 (we could use emitShift)
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call floatdidf
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fadd f1, f1, f1 (fp left shift by 1)
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* linking llvmg++ .s files with gcc instead of g++
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Codegen improvements needed:
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* no alias analysis causes us to generate slow code for Shootout/matrix
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* setCondInst needs to know branchless versions of seteq/setne/etc
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* cast elimination pass (uint -> sbyte -> short, kill the byte -> short)
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* should hint to the branch select pass that it doesn't need to print the
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second unconditional branch, so we don't end up with things like:
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.LBBl42__2E_expand_function_8_21: ; LeafBlock37
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cmplwi cr0, r29, 11
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bne cr0, $+8
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b .LBBl42__2E_expand_function_8_674 ; loopentry.24
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b .LBBl42__2E_expand_function_8_42 ; NewDefault
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b .LBBl42__2E_expand_function_8_42 ; NewDefault
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Current hacks:
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* lazy insert of GlobalBaseReg definition at front of first MBB
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A prime candidate for sabre's "slightly above ISel" passes.
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* cast code is huge, unwieldy. Should probably be broken up into
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smaller pieces.
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* visitLoadInst is getting awfully cluttered as well.
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Currently failing tests:
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* SingleSource
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`- Regression
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| `- 2003-05-22-VarSizeArray
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`- Benchmarks
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| `- Shootout-C++ : most programs fail, miscompilations
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`- UnitTests
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| `- C++Catch
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| `- SimpleC++Test
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`- ConditionalExpr
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`- casts
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`- sumarray2d: large alloca miscompiled
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`- test_indvars
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* MultiSource
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|- Applications
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| `- burg: miscompilation
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| `- siod: llc bus error
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| `- hbd: miscompilation
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| `- d (make_dparser): miscompilation
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`- Benchmarks
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`- MallocBench/make: branch target too far
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