static void sparc_init_libfuncs (void);
static void sparc_output_mi_thunk (FILE *, tree, HOST_WIDE_INT,
HOST_WIDE_INT, tree);
+static bool sparc_can_output_mi_thunk (tree, HOST_WIDE_INT,
+ HOST_WIDE_INT, tree);
static struct machine_function * sparc_init_machine_status (void);
static bool sparc_cannot_force_const_mem (rtx);
static rtx sparc_tls_get_addr (void);
#undef TARGET_ASM_OUTPUT_MI_THUNK
#define TARGET_ASM_OUTPUT_MI_THUNK sparc_output_mi_thunk
#undef TARGET_ASM_CAN_OUTPUT_MI_THUNK
-#define TARGET_ASM_CAN_OUTPUT_MI_THUNK default_can_output_mi_thunk_no_vcall
+#define TARGET_ASM_CAN_OUTPUT_MI_THUNK sparc_can_output_mi_thunk
#undef TARGET_RTX_COSTS
#define TARGET_RTX_COSTS sparc_rtx_costs
rtx slot = gen_rtx_MEM (word_mode,
plus_constant (stack_pointer_rtx, SPARC_STACK_BIAS));
- emit_stack_pointer_decrement (GEN_INT (UNITS_PER_WORD));
+ emit_stack_pointer_decrement (GEN_INT (STACK_BOUNDARY/BITS_PER_UNIT));
emit_insn (gen_rtx_SET (VOIDmode, slot, reg));
emit_insn (seq);
emit_insn (gen_rtx_SET (VOIDmode, reg, slot));
- emit_stack_pointer_increment (GEN_INT (UNITS_PER_WORD));
+ emit_stack_pointer_increment (GEN_INT (STACK_BOUNDARY/BITS_PER_UNIT));
}
-/* Output code to add DELTA to the first argument, and then jump to FUNCTION.
- Used for C++ multiple inheritance. */
+/* Output the assembler code for a thunk function. THUNK_DECL is the
+ declaration for the thunk function itself, FUNCTION is the decl for
+ the target function. DELTA is an immediate constant offset to be
+ added to THIS. If VCALL_OFFSET is nonzero, the word at address
+ (*THIS + VCALL_OFFSET) should be additionally added to THIS. */
static void
sparc_output_mi_thunk (FILE *file, tree thunk_fndecl ATTRIBUTE_UNUSED,
- HOST_WIDE_INT delta,
- HOST_WIDE_INT vcall_offset ATTRIBUTE_UNUSED,
+ HOST_WIDE_INT delta, HOST_WIDE_INT vcall_offset,
tree function)
{
- rtx this, insn, funexp, delta_rtx;
+ rtx this, insn, funexp;
unsigned int int_arg_first;
reload_completed = 1;
/* Add DELTA. When possible use a plain add, otherwise load it into
a register first. */
- delta_rtx = GEN_INT (delta);
- if (!SPARC_SIMM13_P (delta))
+ if (delta)
{
+ rtx delta_rtx = GEN_INT (delta);
+
+ if (! SPARC_SIMM13_P (delta))
+ {
+ rtx scratch = gen_rtx_REG (Pmode, 1);
+ emit_move_insn (scratch, delta_rtx);
+ delta_rtx = scratch;
+ }
+
+ /* THIS += DELTA. */
+ emit_insn (gen_add2_insn (this, delta_rtx));
+ }
+
+ /* Add the word at address (*THIS + VCALL_OFFSET). */
+ if (vcall_offset)
+ {
+ rtx vcall_offset_rtx = GEN_INT (vcall_offset);
rtx scratch = gen_rtx_REG (Pmode, 1);
- if (input_operand (delta_rtx, GET_MODE (scratch)))
- emit_insn (gen_rtx_SET (VOIDmode, scratch, delta_rtx));
+ if (vcall_offset >= 0)
+ abort ();
+
+ /* SCRATCH = *THIS. */
+ emit_move_insn (scratch, gen_rtx_MEM (Pmode, this));
+
+ /* Prepare for adding VCALL_OFFSET. The difficulty is that we
+ may not have any available scratch register at this point. */
+ if (SPARC_SIMM13_P (vcall_offset))
+ ;
+ /* This is the case if ARCH64 (unless -ffixed-g5 is passed). */
+ else if (! fixed_regs[5]
+ /* The below sequence is made up of at least 2 insns,
+ while the default method may need only one. */
+ && vcall_offset < -8192)
+ {
+ rtx scratch2 = gen_rtx_REG (Pmode, 5);
+ emit_move_insn (scratch2, vcall_offset_rtx);
+ vcall_offset_rtx = scratch2;
+ }
else
{
- if (TARGET_ARCH64)
- sparc_emit_set_const64 (scratch, delta_rtx);
- else
- sparc_emit_set_const32 (scratch, delta_rtx);
+ rtx increment = GEN_INT (-4096);
+
+ /* VCALL_OFFSET is a negative number whose typical range can be
+ estimated as -32768..0 in 32-bit mode. In almost all cases
+ it is therefore cheaper to emit multiple add insns than
+ spilling and loading the constant into a register (at least
+ 6 insns). */
+ while (! SPARC_SIMM13_P (vcall_offset))
+ {
+ emit_insn (gen_add2_insn (scratch, increment));
+ vcall_offset += 4096;
+ }
+ vcall_offset_rtx = GEN_INT (vcall_offset); /* cannot be 0 */
}
- delta_rtx = scratch;
- }
+ /* SCRATCH = *(*THIS + VCALL_OFFSET). */
+ emit_move_insn (scratch, gen_rtx_MEM (Pmode,
+ gen_rtx_PLUS (Pmode,
+ scratch,
+ vcall_offset_rtx)));
- emit_insn (gen_rtx_SET (VOIDmode,
- this,
- gen_rtx_PLUS (Pmode, this, delta_rtx)));
+ /* THIS += *(*THIS + VCALL_OFFSET). */
+ emit_insn (gen_add2_insn (this, scratch));
+ }
/* Generate a tail call to the target function. */
if (! TREE_USED (function))
no_new_pseudos = 0;
}
+/* Return true if sparc_output_mi_thunk would be able to output the
+ assembler code for the thunk function specified by the arguments
+ it is passed, and false otherwise. */
+static bool
+sparc_can_output_mi_thunk (tree thunk_fndecl ATTRIBUTE_UNUSED,
+ HOST_WIDE_INT delta ATTRIBUTE_UNUSED,
+ HOST_WIDE_INT vcall_offset,
+ tree function ATTRIBUTE_UNUSED)
+{
+ /* Bound the loop used in the default method above. */
+ return (vcall_offset >= -32768 || ! fixed_regs[5]);
+}
+
/* How to allocate a 'struct machine_function'. */
static struct machine_function *
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