[commit: ghc] wip/ppc-reg-alloc: PPC NCG: Use liveness information in CmmCall (9758dca)

[git at git.haskell.org]

Repository : ssh://git@git.haskell.org/ghc

On branch  : wip/ppc-reg-alloc
Link       : http://ghc.haskell.org/trac/ghc/changeset/9758dcadac31f9c9a0b4e84acaaabdc8c99fcdf1/ghc

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commit 9758dcadac31f9c9a0b4e84acaaabdc8c99fcdf1
Author: Peter Trommler <ptrommler at acm.org>
Date:   Tue Dec 11 16:43:49 2018 +0100

    PPC NCG: Use liveness information in CmmCall
    
    We make liveness information for global registers
    available on `JMP` and `BCTR`, which were the last instructions
    missing. With complete liveness information we do not need to
    reserve global registers in `freeReg` anymore and moreover
    assign R9 and R10 and HpLim to callee save registers. We change
    the calling convention so R1 to R10 occupy a contiguous range
    of registers.
    
    Cleanup by removing `Reg_Su`, which was unused, from `freeReg`
    and removing unused register definitions.
    
    The calculation of the number of floating point registers is too
    conservative. Just follow X86 and specify the constants directly.
    
    Overall this results in 0.3 % smaller code size in nofib while
    runtime is sligtly better in some tests.


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9758dcadac31f9c9a0b4e84acaaabdc8c99fcdf1
 compiler/nativeGen/PPC/CodeGen.hs | 40 +++++++++++++---------
 compiler/nativeGen/PPC/Instr.hs   | 35 +++++++++++--------
 compiler/nativeGen/PPC/Ppr.hs     |  4 +--
 compiler/nativeGen/PPC/Regs.hs    | 12 +++----
 includes/CodeGen.Platform.hs      | 72 ---------------------------------------
 includes/stg/MachRegs.h           | 13 ++++---
 6 files changed, 57 insertions(+), 119 deletions(-)

Diff suppressed because of size. To see it, use:

    git diff-tree --root --patch-with-stat --no-color --find-copies-harder --ignore-space-at-eol --cc 9758dcadac31f9c9a0b4e84acaaabdc8c99fcdf1