diff options
Diffstat (limited to 'gcc/config/h8300/h8300.c')
| -rw-r--r-- | gcc/config/h8300/h8300.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/gcc/config/h8300/h8300.c b/gcc/config/h8300/h8300.c index f90bd414735..86790699f13 100644 --- a/gcc/config/h8300/h8300.c +++ b/gcc/config/h8300/h8300.c @@ -111,6 +111,7 @@ static unsigned int h8300_bitfield_length (rtx, rtx); static unsigned int h8300_binary_length (rtx, const h8300_length_table *); static bool h8300_short_move_mem_p (rtx, enum rtx_code); static unsigned int h8300_move_length (rtx *, const h8300_length_table *); +static bool h8300_hard_regno_scratch_ok (unsigned int); /* CPU_TYPE, says what cpu we're compiling for. */ int cpu_type; @@ -5612,6 +5613,20 @@ h8300_hard_regno_rename_ok (unsigned int old_reg ATTRIBUTE_UNUSED, return 1; } +/* Returns true if register REGNO is safe to be allocated as a scratch + register in the current function. */ + +static bool +h8300_hard_regno_scratch_ok (unsigned int regno) +{ + if (h8300_current_function_interrupt_function_p () + && ! WORD_REG_USED (regno)) + return false; + + return true; +} + + /* Return nonzero if X is a legitimate constant. */ int @@ -5745,6 +5760,9 @@ h8300_return_in_memory (const_tree type, const_tree fntype ATTRIBUTE_UNUSED) #undef TARGET_MACHINE_DEPENDENT_REORG #define TARGET_MACHINE_DEPENDENT_REORG h8300_reorg +#undef TARGET_HARD_REGNO_SCRATCH_OK +#define TARGET_HARD_REGNO_SCRATCH_OK h8300_hard_regno_scratch_ok + #undef TARGET_DEFAULT_TARGET_FLAGS #define TARGET_DEFAULT_TARGET_FLAGS TARGET_DEFAULT |