Hi Suwa-san, On Thu, Oct 20, 2022 at 7:58 PM Takayuki 'January June' Suwa <jjsuwa_sys3...@yahoo.co.jp> wrote: > > This patch offers an additional allocable register by RA for the CALL0 > ABI. > > > Register a0 holds the return address upon entry to a function, but > > unlike the windowed register ABI, it is not reserved for this purpose > > and may hold other values after the return address has been saved. > - Xtensa ISA Reference Manual, > 8.1.2 "CALL0 Register Usage and Stack Layout" [p.589] > > gcc/ChangeLog: > > * config/xtensa/xtensa.cc (xtensa_conditional_register_usage): > Remove register A0 from FIXED_REGS if the CALL0 ABI. > --- > gcc/config/xtensa/xtensa.cc | 7 +++++++ > 1 file changed, 7 insertions(+)
This change results in the following new regressions: FAIL: gcc.c-torture/execute/20040709-1.c -O3 -fomit-frame-pointer -funroll-loops -fpeel-loops -ftracer -finline-functions execution test FAIL: gcc.c-torture/execute/20040709-2.c -O3 -fomit-frame-pointer -funroll-loops -fpeel-loops -ftracer -finline-functions execution test FAIL: gcc.c-torture/execute/20190820-1.c -O3 -fomit-frame-pointer -funroll-loops -fpeel-loops -ftracer -finline-functions execution test FAIL: gcc.c-torture/execute/loop-15.c -O3 -fomit-frame-pointer -funroll-loops -fpeel-loops -ftracer -finline-functions execution test FAIL: gcc.dg/torture/pr101031.c -O3 -fomit-frame-pointer -funroll-loops -fpeel-loops -ftracer -finline-functions execution test FAIL: gcc.dg/torture/pr101972.c -O3 -fomit-frame-pointer -funroll-loops -fpeel-loops -ftracer -finline-functions execution test FAIL: gcc.dg/torture/pr99954.c -O3 -fomit-frame-pointer -funroll-loops -fpeel-loops -ftracer -finline-functions execution test FAIL: g++.dg/coroutines/torture/co-yield-04-complex-local-state.C -O3 -fomit-frame-pointer -funroll-loops -fpeel-loops -ftracer -finline-functions execution test FAIL: g++.dg/coroutines/torture/local-var-05-awaitable.C -O3 -fomit-frame-pointer -funroll-loops -fpeel-loops -ftracer -finline-functions execution test -- Thanks. -- Max
