On Sun, Sep 8, 2024 at 12:22 PM Georg-Johann Lay <a...@gjlay.de> wrote: > > The reason for PR116326 is that LRA and reload require different > ELIMINABLE_REGS for a multi-register frame pointer. As ELIMINABLE_REGS > is used to initialize static const objects, it is not possible to make > ELIMINABLE_REGS dependent on -mlra. > > It was also concluded that it is not desirable to adjust reload so that > it behaves like LRA, see > > https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116326#c8 > > This patch adds a new macro RELOAD_ELIMINABLE_REGS that takes > precedence over ELIMINABLE_REGS in reload1.cc. > > The patch was proposed by H.J. Lu and is only required for trunk.
Can you add documentation to tm.texi please? Otherwise looks good, but please give others a chance to comment. Thanks, Richard. > Johann > > -- > > reload1.cc: rtl-optimization/116326 - Use RELOAD_ELIMINABLE_REGS. > > The new macro is required because reload and LRA are using different > representations for a multi-register frame pointer. As ELIMINABLE_REGS > is used to initialize static const objects, it can't depend on -mlra. > > PR rtl-optimization/116326 > gcc/ > * reload1.cc (reg_eliminate_1): Initialize from > RELOAD_ELIMINABLE_REGS if defined. > * config/avr/avr.h (RELOAD_ELIMINABLE_REGS): Copy from > ELIMINABLE_REGS. > (ELIMINABLE_REGS): Don't mention sub-regnos of the frame pointer. > gcc/testsuite/ > * gcc.target/avr/torture/lra-pr116324.c: New test. > * gcc.target/avr/torture/lra-pr116325.c: New test.
