middle-end: updating the reg use in exit block for -fzero-call-used-regs [PR100775]
In the pass_zero_call_used_regs, when updating dataflow info after adding
the register zeroing sequence in the epilogue of the function, we should
call "df_update_exit_block_uses" to update the register use information in
the exit block to include all the registers that have been zeroed.
2022-02-10 Qing Zhao <qing.zhao@oracle.com>
gcc/ChangeLog:
PR middle-end/100775
* function.cc (gen_call_used_regs_seq): Call
df_update_exit_block_uses when updating df.
gcc/testsuite/ChangeLog:
PR middle-end/100775
* gcc.target/arm/pr100775.c: New test.