diff options
Diffstat (limited to 'gcc/config/pa/pa.c')
| -rw-r--r-- | gcc/config/pa/pa.c | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/gcc/config/pa/pa.c b/gcc/config/pa/pa.c index 723fbec..7f4ba45 100644 --- a/gcc/config/pa/pa.c +++ b/gcc/config/pa/pa.c @@ -143,6 +143,9 @@ static void output_deferred_plabels (void); static void pa_hpux_init_libfuncs (void); #endif static rtx pa_struct_value_rtx (tree, int); +static bool pa_pass_by_reference (CUMULATIVE_ARGS *ca, enum machine_mode, + tree, bool); + /* Save the operands last given to a compare for use when we generate a scc or bcc insn. */ @@ -267,6 +270,8 @@ static size_t n_deferred_plabels = 0; #define TARGET_RETURN_IN_MEMORY pa_return_in_memory #undef TARGET_MUST_PASS_IN_STACK #define TARGET_MUST_PASS_IN_STACK must_pass_in_stack_var_size +#undef TARGET_PASS_BY_REFERENCE +#define TARGET_PASS_BY_REFERENCE pa_pass_by_reference #undef TARGET_EXPAND_BUILTIN_SAVEREGS #define TARGET_EXPAND_BUILTIN_SAVEREGS hppa_builtin_saveregs @@ -5838,6 +5843,37 @@ secondary_reload_class (enum reg_class class, enum machine_mode mode, rtx in) return NO_REGS; } +/* In the 32-bit runtime, arguments larger than eight bytes are passed + by invisible reference. As a GCC extension, we also pass anything + with a zero or variable size by reference. + + The 64-bit runtime does not describe passing any types by invisible + reference. The internals of GCC can't currently handle passing + empty structures, and zero or variable length arrays when they are + not passed entirely on the stack or by reference. Thus, as a GCC + extension, we pass these types by reference. The HP compiler doesn't + support these types, so hopefully there shouldn't be any compatibility + issues. This may have to be revisited when HP releases a C99 compiler + or updates the ABI. */ + +static bool +pa_pass_by_reference (CUMULATIVE_ARGS *ca ATTRIBUTE_UNUSED, + enum machine_mode mode, tree type, + bool named ATTRIBUTE_UNUSED) +{ + HOST_WIDE_INT size; + + if (type) + size = int_size_in_bytes (type); + else + size = GET_MODE_SIZE (mode); + + if (TARGET_64BIT) + return size <= 0; + else + return size <= 0 || size > 8; +} + enum direction function_arg_padding (enum machine_mode mode, tree type) { |