diff options
Diffstat (limited to 'gcc/config/pdp11/pdp11.c')
| -rw-r--r-- | gcc/config/pdp11/pdp11.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/gcc/config/pdp11/pdp11.c b/gcc/config/pdp11/pdp11.c index b4d54fc0..d8fe00c 100644 --- a/gcc/config/pdp11/pdp11.c +++ b/gcc/config/pdp11/pdp11.c @@ -235,6 +235,9 @@ static bool pdp11_scalar_mode_supported_p (scalar_mode); #undef TARGET_SCALAR_MODE_SUPPORTED_P #define TARGET_SCALAR_MODE_SUPPORTED_P pdp11_scalar_mode_supported_p + +#undef TARGET_HARD_REGNO_MODE_OK +#define TARGET_HARD_REGNO_MODE_OK pdp11_hard_regno_mode_ok /* A helper function to determine if REGNO should be saved in the current function's stack frame. */ @@ -1925,4 +1928,23 @@ pdp11_branch_cost () return (TARGET_BRANCH_CHEAP ? 0 : 1); } +/* Implement TARGET_HARD_REGNO_MODE_OK. On the pdp, the cpu registers + can hold any mode other than float (because otherwise we may end up + being asked to move from CPU to FPU register, which isn't a valid + operation on the PDP11). For CPU registers, check alignment. + + FPU accepts SF and DF but actually holds a DF - simplifies life! */ + +static bool +pdp11_hard_regno_mode_ok (unsigned int regno, machine_mode mode) +{ + if (regno <= PC_REGNUM) + return (GET_MODE_BITSIZE (mode) <= 16 + || (GET_MODE_BITSIZE (mode) >= 32 + && !(regno & 1) + && !FLOAT_MODE_P (mode))); + + return FLOAT_MODE_P (mode); +} + struct gcc_target targetm = TARGET_INITIALIZER; |