https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119953
Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |law at gcc dot gnu.org
Target Milestone|--- |15.2
Summary|Compiling libstdc++ on |[15/16 Regression]
|MSP430 fails |Compiling libstdc++ on
| |MSP430 fails
Known to fail| |15.1.0
Known to work| |14.1.0
--- Comment #8 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Seems to have regressed with r15-2196-g88d16194d0c8a6
Author: Jeff Law
Date: Mon Jul 22 08:45:10 2024 -0600
[NFC][PR rtl-optimization/115877] Avoid setting irrelevant bit groups as
live in ext-dce
Another patch to refine liveness computations. This should be NFC and is
designed to help debugging.
In simplest terms the patch avoids setting bit groups outside the size of a
pseudo as live. Consider a HImode pseudo, bits 16..63 for such a pseudo
don't
really have meaning, yet we often set bit groups related to bits 16.63 on
in
the liveness bitmaps.
This makes debugging harder than it needs to be by simply having larger
bitmaps
to verify when walking through the code in a debugger.
This has been bootstrapped and regression tested on x86_64. It's also been
tested on the crosses in my tester without regressions.
Pushing to the trunk,
PR rtl-optimization/115877
gcc/
* ext-dce.cc (group_limit): New function.
(mark_reg_live): Likewise.
(ext_dce_process_sets): Use new functions.
(ext_dce_process_uses): Likewise.
(ext_dce_init): Likewise.
