On 7/9/19 10:23 AM, claz...@gmail.com wrote:
> Hi Jeff,
> 
> Please find attached the updated patch.
> 
> What is new:
> - mailing list feedback is taken into account.
> - some comments are updated.
> - a new test is added.
> - the ARC AUX registers used by ZOL (hardware loop) and FPX (a custom
> floating point implementation) are saved before fp-register.
> - the millicode optimization is not used by ISR.
> 
> 
> Thank you,
> Claudiu
> 
> 
> 0001-ARC-Fix-and-refurbish-the-interrupts.patch
> 
> From d22368681b7aab4bef4b5c32a9a472808f2c16cd Mon Sep 17 00:00:00 2001
> From: Claudiu Zissulescu <claz...@gmail.com>
> Date: Fri, 17 May 2019 14:48:17 +0300
> Subject: [PATCH] [ARC] Fix and refurbish the interrupts.
> 
> When entering an interrupt, not only the call save registers needs to
> be place on stack but also the call clobbers one. More over, the
> ARC700 return from interrupt instruction needs to be rtie, the same
> like ARCv2 CPUs. While the ARC6xx family uses j.f [ilinkX]
> instruction. Additionally, we need to save the state of the ZOL
> machinery, namely the lp_count, lp_end and lp_start registers. For
> architectures which are using extension registers (i.e., HS48) we need
> to save/restore them as well.
> 
> gcc/
> xxxx-xx-xx  Claudiu Zissulescu  <claz...@synopsys.com>
> 
>       * config/arc/arc-protos.h (arc_output_function_epilogue): Delete
>       declaration.
>       (arc_compute_frame_size): Millicode is disabled when compiling
>       ISR.
>       (arc_return_address_register): Likewise.
>       (arc_compute_function_type): Likewise.
>       (arc_compute_frame_size): Likewise.
>       (secondary_reload_info): Likewise.
>       (arc_get_unalign): Likewise.
>       (arc_can_use_return_insn): Declare.
>       * config/arc/arc.c (AUX_LP_START): Define
>       (AUX_LP_END): Likewise.
>       (arc_frame_info): Update gmask member to 64-bit datum.
>       (GMASK_LEN): Update.
>       (arc_compute_function_type): Make it static, move it forward.
>       (arc_must_save_register): Update, consider the extra regs.
>       (arc_compute_millicode_save_restore_regs): Update to use the 64
>       bit gmask.
>       (arc_compute_frame_size): Likewise.
>       (arc_enter_leave_p): Likewise.
>       (arc_save_callee_saves): Likewise.
>       (arc_restore_callee_saves): Likewise.
>       (arc_save_callee_enter): Likewise.
>       (arc_restore_callee_leave): Likewise.
>       (arc_save_callee_milli): Likewise.
>       (arc_restore_callee_milli): Likewise.
>       (arc_expand_prologue): Add new interrupt handling.
>       (arc_return_address_register): Make it static, move it forward.
>       (arc_expand_epilogue): Add new interrupt handling.
>       (arc_get_unalign): Delete.
>       (arc_epilogue_uses): Make sure we do not remove the extra
>       saved/restored registers when interrupt.
>       (arc_can_use_return_insn): New function.
>       (push_reg): Likewise.
>       (pop_reg): Likewise.
>       (arc_save_callee_saves): Add ZOL and FPX aux registers saving
>       procedures.
>       (arc_restore_callee_saves): Likewise, but restoring.
>       * config/arc/arc.md (VUNSPEC_ARC_ARC600_RTIE): Define.
>       (R33_REG): Likewise.
>       (R34_REG): Likewise.
>       (R35_REG): Likewise.
>       (R36_REG): Likewise.
>       (R37_REG): Likewise.
>       (R38_REG): Likewise.
>       (R39_REG): Likewise.
>       (R45_REG): Likewise.
>       (R46_REG): Likewise.
>       (R47_REG): Likewise.
>       (R48_REG): Likewise.
>       (R49_REG): Likewise.
>       (R50_REG): Likewise.
>       (R51_REG): Likewise.
>       (R52_REG): Likewise.
>       (R53_REG): Likewise.
>       (R54_REG): Likewise.
>       (R55_REG): Likewise.
>       (R56_REG): Likewise.
>       (R58_REG): Likewise.
>       (type): Add rtie attribute.
>       (in_call_delay_slot): Use RETURN_ADDR_REGNUM.
>       (movsi_insn): Accept moves to lp_count.
>       (rtie): Update pattern.
>       (simple_return): Simplify it, don't use this pattern as a return
>       from an interrupt.
>       (arc600_rtie): New pattern.
>       (p_return_i): Clean up.
>       (return): Likewise.
>       * config/arc/builtins.def (rtie): Only available for non ARC6xx
>       family CPUs.
>       * config/arc/predicates.md (move_src_operand): Consider lp_count
>       as a register.
> 
> gcc/testsuite
> xxxx-xx-xx  Claudiu Zissulescu  <claz...@synopsys.com>
> 
>       * gcc.target/arc/arc.exp (check_effective_target_accregs): New
>       predicate.
>       * gcc.target/arc/builtin_special.c: Update test/
>       * gcc.target/arc/interrupt-1.c: Likewise.
>       * gcc.target/arc/interrupt-10.c: New test.
>       * gcc.target/arc/interrupt-11.c: Likewise.
>       * gcc.target/arc/interrupt-12.c: Likewise.
OK

Jeff

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