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h8300.c (WORD_REG_USED): Update to avoid useless register saves in interrupt functions and functions...

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* h8300.c (WORD_REG_USED): Update to avoid useless register
        saves in interrupt functions and functions which never return.

From-SVN: r29724
This commit is contained in:
Jeffrey A Law 1999-09-30 07:00:53 +00:00 committed by Jeff Law
parent b8d2540a85
commit fc80ea735e
2 changed files with 18 additions and 5 deletions
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3
gcc/ChangeLog
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@ -10,6 +10,9 @@ Thu Sep 30 00:13:27 1999 Dirk Zoller <duz@rtsffm.com>
Wed Sep 29 23:43:39 1999 Jeffrey A Law (law@cygnus.com)
* h8300.c (WORD_REG_USED): Update to avoid useless register
saves in interrupt functions and functions which never return.
* cse.c (struct set): Delete inner_dest_loc field.
(cse_insn): Remove assignments to inner_dest_loc field.

20
gcc/config/h8300/h8300.c
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@ -124,11 +124,21 @@ byte_reg (x, b)
/* REGNO must be saved/restored across calls if this macro is true. */
#define WORD_REG_USED(regno) \
(regno < 7 && \
(interrupt_handler \
|| pragma_saveall \
|| (regno == FRAME_POINTER_REGNUM && regs_ever_live[regno]) \
|| (regs_ever_live[regno] && !call_used_regs[regno])))
(regno < 7 \
/* No need to save registers if this function will not return.*/\
&& ! TREE_THIS_VOLATILE (current_function_decl) \
&& (pragma_saveall \
/* Save any call saved register that was used. */ \
|| (regs_ever_live[regno] && !call_used_regs[regno]) \
/* Save the frame pointer if it was used. */ \
|| (regno == FRAME_POINTER_REGNUM && regs_ever_live[regno])\
/* Save any register used in an interrupt handler. */ \
|| (interrupt_handler && regs_ever_live[regno]) \
/* Save call clobbered registers in non-leaf interrupt \
handlers. */ \
|| (interrupt_handler \
&& call_used_regs[regno] \
&& !current_function_is_leaf)))
/* Output assembly language to FILE for the operation OP with operand size
SIZE to adjust the stack pointer. */