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.
/* 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. */