[RFC PATCH, i386]: Remove peephole2s for (subreg (operator (...)(...))) RTXes

[H.J. Lu]

On Sat, Oct 27, 2012 at 5:12 AM, Uros Bizjak <ubizjak@gmail.com> wrote:
> Hello!
>
> As suggested by Richard S. [1], after the patch that converts subreg:M
> (op:N (...)(...)) to op:M (subreg:M (...) subreg:M (...)), we can
> remove several peephole2 patterns that handle subregs of PLUS, MINUS
> and MULT operators. I have attached RFC prototype patch that will
> trigger an ICE when to-be-removed pattern triggers, with the intention
> that these patterns wil be removed entirely (An "invalid" pattern was
> indeed generated elsewhere, see patch).
>
> 2012-10-18  Uros Bizjak  <ubizjak@gmail.com>
>
>         * config/i386/i386.md (ashift to lea splitter): Split to SImode mult.
>         (simple lea to add/shift peephole2s): Remove peephole2s that operate
>         on subregs of DImode operations.
>         (*mov<mode>_insv_1_rex64): Use gen_int_mode to truncate
>         const_int RTX to QImode value.
>         (*movsi_insv_1): Ditto.
>
> The patch was bootstrapped and regression tested on
> x86_64-pc-linux-gnu {,-m32} without problems, but I will ask H.J. to
> test the patch on x32 before it is committed to mainline SVN.
>
> [1] http://gcc.gnu.org/ml/gcc-patches/2012-09/msg01856.html
>
> Uros.

I tested it on x32, ia32 and x86-64 with GCC testsuite and glibc.
There are no GCC regressions on x32. However, for glibc trunk,
on x32 and x86-64, I got

make[4]: *** [/export/build/gnu/glibc-test/build-x86_64-linux/math/test-ildoubl.out]
Error 1
make[4]: *** [/export/build/gnu/glibc-test/build-x86_64-linux/math/test-ldouble.out]
Error 1

On ia32, I got

make[4]: *** [/export/build/gnu/glibc-32bit-test/build-i686-linux/math/test-fenv.out]
Error 1
make[4]: *** [/export/build/gnu/glibc-32bit-test/build-i686-linux/math/test-ifloat.out]
Error 1
make[4]: *** [/export/build/gnu/glibc-32bit-test/build-i686-linux/math/test-idouble.out]
Error 1
make[4]: *** [/export/build/gnu/glibc-32bit-test/build-i686-linux/math/test-float.out]
Error 1
make[4]: *** [/export/build/gnu/glibc-32bit-test/build-i686-linux/math/test-double.out]
Error 1

I am testing if they are caused by the change.

-- 
H.J.