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3ea934668b
Use a PowerPC specific prolog epilog inserter to control where spilled callee save regs are placed on the stack. Get rid of implicit return address stack slot, save return address reg (LR) in appropriate slot Improve code generated for functions that don't have calls or access globals Note from Chris: PowerPCPEI will eventually be eliminated, once the functionality is merged into CodeGen/PrologEpilogInserter.cpp git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@15536 91177308-0d34-0410-b5e6-96231b3b80d8
59 lines
2.0 KiB
Plaintext
59 lines
2.0 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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* 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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* PowerPCPEI.cpp needs to save/restore regs in the opposite order
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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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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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| `- casts (ulong to fp failure)
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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 (also C++)
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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: miscompilation
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