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Re: [Qemu-devel] [PATCH 00/16] Cleanups within TCG middle-end
From: |
Alex Bennée |
Subject: |
Re: [Qemu-devel] [PATCH 00/16] Cleanups within TCG middle-end |
Date: |
Mon, 26 Jun 2017 17:49:58 +0100 |
User-agent: |
mu4e 0.9.19; emacs 25.2.50.3 |
Richard Henderson <address@hidden> writes:
> There are two conceptually unrelated cleanups in here, though
> the second touches many of the same lines as the first, so
> separating the two would be ugly.
>
> The first is to split gen_opparam_buf and move the pieces into
> TCGOp. This has two effects: the operands for an op is in the
> same cacheline as the op, and we get to drop the pointer into
> gen_opparam_buf, freeing up a register and/or function argument.
>
> The second is to change what value is stored in TCGArg for each
> TCG temporary. Rather than store the index into tcg_ctx.temps,
> store the pointer to the temp itself. This allows us to drop
> some arithmetic on many uses of a temp within the backend.
>
> Making that second change is tricky, as we don't want to miss any
> of the places that ought to be changed. To do that I introduce a
> number of helpers.
>
> As a final step I changed the type of TCGOp.args to a structure,
> and annotated the places that access constant arguments. I found
> that final patch to be really ugly, so I dropped it. But I'm
> fairly confident that I've updated all of the non-constant args.
>
> The effect of this is nearly noise, but does reduce code size,
>
> text data bss dec hex filename
> 6648688 2106408 4486112 13241208 ca0b78 qemu-system-alpha (before)
> 6627656 2106408 4502496 13236560 c9f950 qemu-system-alpha (after)
>
> or about 21k.
Hmm it compile tested fine on mine but:
qemu-system-sparc: /home/alex/lsrc/qemu/qemu.git/tcg/tcg.h:725: temp_arg:
Assertion `n < tcg_ctx.nb_temps' failed.
Broken pipe
GTester: last random seed: R02Sd6911d835e4140adeb8780ec1bf70af1
qemu-system-sparc: /home/alex/lsrc/qemu/qemu.git/tcg/tcg.h:725: temp_arg:
Assertion `n < tcg_ctx.nb_temps' failed.
Broken pipe
GTester: last random seed: R02Sff8343267ed0c224ea97a4f54e970d65
qemu-system-sparc: /home/alex/lsrc/qemu/qemu.git/tcg/tcg.h:725: temp_arg:
Assertion `n < tcg_ctx.nb_temps' failed.
Broken pipe
GTester: last random seed: R02Sfb0d300ff314d4f31a4f5bb414f5f249
/home/alex/lsrc/qemu/qemu.git/tests/Makefile.include:824: recipe for target
'check-qtest-sparc' failed
make: *** [check-qtest-sparc] Error 1
test: Expected a combining operator like '-a' at index 1
And also Travis is quite un-happy:
https://travis-ci.org/stsquad/qemu/builds/247099991
>
>
> r~
>
>
> Richard Henderson (16):
> tcg: Merge opcode arguments into TCGOp
> tcg: Propagate args to op->args in optimizer
> tcg: Propagate args to op->args in tcg.c
> tcg: Propagate TCGOp down to allocators
> tcg: Introduce arg_temp
> tcg: Add temp_global bit to TCGTemp
> tcg: Return NULL temp for TCG_CALL_DUMMY_ARG
> tcg: Introduce temp_arg
> tcg: Use per-temp state data in liveness
> tcg: Avoid loops against variable bounds
> tcg: Change temp_allocate_frame arg to TCGTemp
> tcg: Remove unused TCG_CALL_DUMMY_TCGV
> tcg: Export temp_idx
> tcg: Use per-temp state data in optimize
> tcg: Define separate structures for TCGv_*
> tcg: Store pointers to temporaries directly in TCGArg
>
> tcg/optimize.c | 647
> ++++++++++++++++++++++++++++++++-------------------------
> tcg/tcg-op.c | 99 ++++-----
> tcg/tcg.c | 610 ++++++++++++++++++++++++-----------------------------
> tcg/tcg.h | 287 ++++++++++++++-----------
> 4 files changed, 841 insertions(+), 802 deletions(-)
--
Alex Bennée
- [Qemu-devel] [PATCH 12/16] tcg: Remove unused TCG_CALL_DUMMY_TCGV, (continued)
- [Qemu-devel] [PATCH 12/16] tcg: Remove unused TCG_CALL_DUMMY_TCGV, Richard Henderson, 2017/06/20
- [Qemu-devel] [PATCH 13/16] tcg: Export temp_idx, Richard Henderson, 2017/06/20
- [Qemu-devel] [PATCH 15/16] tcg: Define separate structures for TCGv_*, Richard Henderson, 2017/06/20
- [Qemu-devel] [PATCH 16/16] tcg: Store pointers to temporaries directly in TCGArg, Richard Henderson, 2017/06/20
- [Qemu-devel] [PATCH 14/16] tcg: Use per-temp state data in optimize, Richard Henderson, 2017/06/20
- Re: [Qemu-devel] [PATCH 00/16] Cleanups within TCG middle-end, no-reply, 2017/06/20
- Re: [Qemu-devel] [PATCH 00/16] Cleanups within TCG middle-end,
Alex Bennée <=