[Bug target/115633] New: [15 Regression] powerpc64le: "relocation truncated to fit: R_PPC64_TOC16 against `.rodata.cst4'" with (default) '-flate-combine-instructions'

[Bug target/115633] New: [15 Regression] powerpc64le: "relocation truncated to fit: R_PPC64_TOC16 against `.rodata.cst4'" with (default) '-flate-combine-instructions'

[tschwinge at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115633

            Bug ID: 115633
           Summary: [15 Regression] powerpc64le: "relocation truncated to
                    fit: R_PPC64_TOC16 against `.rodata.cst4'" with
                    (default) '-flate-combine-instructions'
           Product: gcc
           Version: 15.0
            Status: UNCONFIRMED
          Keywords: testsuite-fail
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: tschwinge at gcc dot gnu.org
                CC: rsandifo at gcc dot gnu.org, seurer at gcc dot gnu.org
  Target Milestone: ---
            Target: powerpc64le-unknown-linux-gnu

With commit r15-1579-g792f97b44ffc5e6a967292b3747fd835e99396e7 "Add a
late-combine pass [PR106594]", I see on powerpc64le-unknown-linux-gnu a number
of "relocation truncated to fit: R_PPC64_TOC16 against `.rodata.cst4'" etc.
with (default) '-flate-combine-instructions':

    [-PASS:-]{+FAIL:+} gcc.dg/pr91734.c (test for excess errors)
    [-PASS:-]{+UNRESOLVED:+} gcc.dg/pr91734.c [-execution test-]{+compilation
failed to produce executable+}

    /tmp/ccOWP7Yx.o: in function `f2':
    pr91734.c:(.text+0x38): relocation truncated to fit: R_PPC64_TOC16 against
`.rodata.cst4'
    /tmp/ccOWP7Yx.o: in function `f3':
    pr91734.c:(.text+0x68): relocation truncated to fit: R_PPC64_TOC16 against
`.rodata.cst4'
    /tmp/ccOWP7Yx.o: in function `f4':
    pr91734.c:(.text+0x98): relocation truncated to fit: R_PPC64_TOC16 against
`.rodata.cst4'+4
    /tmp/ccOWP7Yx.o: in function `f5':
    pr91734.c:(.text+0xc8): relocation truncated to fit: R_PPC64_TOC16 against
`.rodata.cst4'+8
    /tmp/ccOWP7Yx.o: in function `f6':
    pr91734.c:(.text+0xf8): relocation truncated to fit: R_PPC64_TOC16 against
`.rodata.cst4'+c
    /tmp/ccOWP7Yx.o: in function `f7':
    pr91734.c:(.text+0x128): relocation truncated to fit: R_PPC64_TOC16 against
`.rodata.cst4'+10
    /tmp/ccOWP7Yx.o: in function `f8':
    pr91734.c:(.text+0x158): relocation truncated to fit: R_PPC64_TOC16 against
`.rodata.cst4'+14
    /tmp/ccOWP7Yx.o: in function `f9':
    pr91734.c:(.text+0x188): relocation truncated to fit: R_PPC64_TOC16 against
`.rodata.cst4'+18
    /tmp/ccOWP7Yx.o: in function `f10':
    pr91734.c:(.text+0x1b8): relocation truncated to fit: R_PPC64_TOC16 against
`.rodata.cst4'+1c
    collect2: error: ld returned 1 exit status

This is with the Debian GNU/Linux 12 (bookworm) binutils 2.40-2 package.  (...,
in case that's where the problem is...)

Similarly:

    [-PASS:-]{+FAIL:+} gcc.dg/sinatan-1.c (test for excess errors)
    [-PASS:-]{+UNRESOLVED:+} gcc.dg/sinatan-1.c [-execution test-]{+compilation
failed to produce executable+}

    [-PASS:-]{+FAIL:+} gcc.dg/ipa/inline-8.c (test for excess errors)
    [-PASS:-]{+UNRESOLVED:+} gcc.dg/ipa/inline-8.c [-execution
test-]{+compilation failed to produce executable+}

..., and (roughly) all 'gcc.dg/vect/tsvc/[...]' test cases that don't use
'-flto'.

                    === gcc Summary ===

    # of expected passes            [-179982-]{+179673+}
    # of unexpected failures        [-127-]{+282+}
    # of unexpected successes       20
    # of expected failures          1612
    {+# of unresolved testcases     154+}
    # of unsupported tests          4394

Additionally:

    [-PASS:-]{+FAIL:+} libgomp.c/simd-math-1.c (test for excess errors)
    [-PASS:-]{+UNRESOLVED:+} libgomp.c/simd-math-1.c [-execution
test-]{+compilation failed to produce executable+}


I see a number of recent <gcc-testresults@gcc.gnu.org> emails by Bill Seurer
that contain a similar set of new FAILs, so putting you in CC here.

[Bug target/115633] [15 Regression] powerpc64le: "relocation truncated to fit: R_PPC64_TOC16 against `.rodata.cst4'" with (default) '-flate-combine-instructions'

[sjames at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115633

Sam James <sjames at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |sjames at gcc dot gnu.org

--- Comment #1 from Sam James <sjames at gcc dot gnu.org> ---
I thought it wasn't supposed to be default on powerpc? (PR115612)

[Bug target/115633] [15 Regression] powerpc64le: "relocation truncated to fit: R_PPC64_TOC16 against `.rodata.cst4'" with (default) '-flate-combine-instructions'

[rsandifo at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115633

--- Comment #2 from Richard Sandiford <rsandifo at gcc dot gnu.org> ---
-flate-combine-instructions is supposed to be disabled by default for all
powerpc targets.  Could you look at why that isn't the case for you?

[Bug target/115633] [15 Regression] powerpc64le: "relocation truncated to fit: R_PPC64_TOC16 against `.rodata.cst4'" with (default) '-flate-combine-instructions' since r15-1579-g792f97b44ffc5e6a967292b3747fd835e99396e7

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115633

--- Comment #3 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The trunk branch has been updated by Thomas Schwinge <tschwinge@gcc.gnu.org>:

https://gcc.gnu.org/g:70480055636c2ca79761cb4440e930daa16bb7aa

commit r15-1607-g70480055636c2ca79761cb4440e930daa16bb7aa
Author: Thomas Schwinge <tschwinge@baylibre.com>
Date:   Tue Jun 25 10:55:41 2024 +0200

    rs6000: Properly default-disable late-combine passes [PR106594, PR115622,
PR115633]

    ..., so that it also works for '__attribute__ ((optimize("[...]")))' etc.

            PR target/106594
            PR target/115622
            PR target/115633
            gcc/
            * config/rs6000/rs6000.cc (rs6000_option_override_internal): Move
            default-disable of late-combine passes from here...
            (rs6000_override_options_after_change): ... to here.

[Bug target/115633] [15 Regression] powerpc64le: "relocation truncated to fit: R_PPC64_TOC16 against `.rodata.cst4'" with (default) '-flate-combine-instructions' since r15-1579-g792f97b44ffc5e6a967292b3747fd835e99396e7

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115633

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|---                         |15.0

[Bug target/115633] [15 Regression] powerpc64le: "relocation truncated to fit: R_PPC64_TOC16 against `.rodata.cst4'" with (default) '-flate-combine-instructions' since r15-1579-g792f97b44ffc5e6a967292b3747fd835e99396e7

[tschwinge at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115633

Thomas Schwinge <tschwinge at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |FIXED
           Assignee|unassigned at gcc dot gnu.org      |tschwinge at gcc dot gnu.org
             Status|UNCONFIRMED                 |RESOLVED
           See Also|https://gcc.gnu.org/bugzill |
                   |a/show_bug.cgi?id=115612    |

--- Comment #4 from Thomas Schwinge <tschwinge at gcc dot gnu.org> ---
Fixed.