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* [0/8] Add optabs alternatives for insv, extv and extzv
@ 2012-11-03 11:10 Richard Sandiford
  2012-11-03 11:13 ` [1/8] Handle TRUNCATE in make_extraction Richard Sandiford
                   ` (8 more replies)
  0 siblings, 9 replies; 42+ messages in thread
From: Richard Sandiford @ 2012-11-03 11:10 UTC (permalink / raw)
  To: gcc-patches

This series was inspired by Andrew's patch from September:

    http://gcc.gnu.org/ml/gcc-patches/2012-09/msg00126.html

and by a general frustration with the insv, extv and extzv interface.
The patches add 6 new optabs:

    insvM:          an M<-M register insertion
    insvmisalignM:  a BLK<-M memory insertion
    extvM:          a signed M<-M register extraction
    extvmisalignM:  a signed M<-BLK memory extraction
    extzvM:         an unsigned M<-M register extraction
    extzvmisalignM: an unsigned M<-BLK memory extraction

The BLKmode memory references are to the full bitfield, instead of
just a byte_mode memory reference to the first byte.  I used "misalign"
to emphasise that there's no alignment guarantee for the memory operand.

I've tried to leave open the possibility of having (aligned) M<-M memory
operations in future, but I haven't added them here because I have no
use case.  It's also not clear to me whether we'd want to generate the
memory form during expand or leave it up to combine.

The main target of this change is MIPS64r2, which can do both 32-bit and
64-bit insertions and extractions.  The current rtl code tends to do things
in 64 bits, because that's how the insv and ext(z)v interface is defined,
but doing things in 64 bits requires any 32-bit results to be explicitly
"truncated" (i.e. sign-extended).  Providing the optabs interface makes
both widths available.

Tested on x86_64-linux-gnu, powerpc64-linux-gnu and mipsisa64-elf.
Also tested by making sure that there were no changes in assembly
output for a set of gcc .ii files.  On the other hand, the -march=octeon
output for a set of mips64-linux-gnu gcc .ii files showed the optimisation
kicking in as hoped.

Richard

^ permalink raw reply	[flat|nested] 42+ messages in thread

end of thread, other threads:[~2012-11-29 15:31 UTC | newest]

Thread overview: 42+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2012-11-03 11:10 [0/8] Add optabs alternatives for insv, extv and extzv Richard Sandiford
2012-11-03 11:13 ` [1/8] Handle TRUNCATE in make_extraction Richard Sandiford
2012-11-10 15:52   ` Eric Botcazou
2012-11-03 11:14 ` [2/8] Add adjust_bitfield_address_size Richard Sandiford
2012-11-10 15:53   ` Eric Botcazou
2012-11-03 11:16 ` [3/8] Add narrow_bit_field_mem Richard Sandiford
2012-11-10 16:02   ` Eric Botcazou
2012-11-03 11:21 ` [4/8] Add bit_field_mode_iterator Richard Sandiford
2012-11-13 12:44   ` Eric Botcazou
2012-11-13 21:46     ` Richard Henderson
2012-11-13 22:05       ` Eric Botcazou
2012-11-15 12:11         ` Richard Sandiford
2012-11-15 20:39           ` Richard Henderson
2012-11-18 17:34             ` Richard Sandiford
2012-11-18 17:36     ` Richard Sandiford
2012-11-03 11:27 ` [5/8] Tweak bitfield alignment handling Richard Sandiford
2012-11-13 13:52   ` Eric Botcazou
2012-11-18 17:36     ` Richard Sandiford
2012-11-20  2:57       ` John David Anglin
2012-11-20  8:21         ` Mikael Pettersson
2012-11-20 10:32           ` Richard Sandiford
2012-11-20 19:56             ` Richard Sandiford
2012-11-20 22:11             ` Eric Botcazou
2012-11-03 11:28 ` [6/8] Add strict volatile handling to bit_field_mode_iterator Richard Sandiford
2012-11-13 13:57   ` Eric Botcazou
2012-11-15 12:25     ` Richard Sandiford
2012-11-15 17:10       ` Eric Botcazou
2012-11-15 17:47         ` Richard Sandiford
2012-11-15 19:32           ` Eric Botcazou
2012-11-18 17:36             ` Richard Sandiford
2012-11-03 11:39 ` [7/8] Replace mode_for_extraction with new interface Richard Sandiford
2012-11-03 11:41 ` [8/8] Add new optabs and use them for MIPS Richard Sandiford
2012-11-27 17:11 ` [0/8] Add optabs alternatives for insv, extv and extzv Ramana Radhakrishnan
2012-11-27 20:22   ` Richard Sandiford
2012-11-27 22:45     ` Ramana Radhakrishnan
2012-11-28 10:25       ` Richard Biener
2012-11-28 12:06         ` Ramana Radhakrishnan
2012-11-28 12:51           ` Richard Biener
2012-11-28 13:58       ` Richard Sandiford
2012-11-28 23:19         ` Eric Botcazou
2012-11-29 10:31           ` Richard Sandiford
2012-11-29 15:31             ` Eric Botcazou

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