RISC-V: Disallow regrenme if the TO register never used before for interrupt functions
gcc/ChangeLog PR target/93304 * config/riscv/riscv-protos.h (riscv_hard_regno_rename_ok): New. * config/riscv/riscv.c (riscv_hard_regno_rename_ok): New. * config/riscv/riscv.h (HARD_REGNO_RENAME_OK): Defined. gcc/testsuite/ChangeLog PR target/93304 * gcc.target/riscv/pr93304.c: New test.
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gcc/testsuite/gcc.target/riscv/pr93304.c
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