* @file
* @brief calling convention helpers
* @author Matthias Braun
- * @version $Id$
*/
#include "config.h"
+#include "be_t.h"
+#include "beirg.h"
#include "sparc_cconv.h"
#include "irmode.h"
#include "irgwalk.h"
#include "util.h"
#include "error.h"
#include "gen_sparc_regalloc_if.h"
+#include "bitfiddle.h"
static const unsigned ignore_regs[] = {
REG_G0,
- /* reserved for sparc ABI: */
+ /* used in case an address offset does not fit into an immediate: */
+ REG_G4,
+ /* reserved for SPARC ABI: */
REG_G5,
REG_G6,
REG_G7,
REG_FPFLAGS,
REG_FLAGS,
REG_Y,
+
+ REG_F31,
+};
+
+static const arch_register_t* const param_regs[] = {
+ &sparc_registers[REG_I0],
+ &sparc_registers[REG_I1],
+ &sparc_registers[REG_I2],
+ &sparc_registers[REG_I3],
+ &sparc_registers[REG_I4],
+ &sparc_registers[REG_I5],
};
+COMPILETIME_ASSERT(ARRAY_SIZE(param_regs) == SPARC_N_PARAM_REGS, sparcparamregs)
+
+static const arch_register_t* const float_result_regs[] = {
+ &sparc_registers[REG_F0],
+ &sparc_registers[REG_F1],
+ &sparc_registers[REG_F2],
+ &sparc_registers[REG_F3],
+ &sparc_registers[REG_F4],
+ &sparc_registers[REG_F5],
+ &sparc_registers[REG_F6],
+ &sparc_registers[REG_F7],
+};
+static arch_register_req_t float_result_reqs_double[8];
+static arch_register_req_t float_result_reqs_quad[8];
+
+static const unsigned caller_saves[] = {
+ REG_G1,
+ REG_G2,
+ REG_G3,
+ REG_O0,
+ REG_O1,
+ REG_O2,
+ REG_O3,
+ REG_O4,
+ REG_O5,
+ REG_F0,
+ REG_F1,
+ REG_F2,
+ REG_F3,
+ REG_F4,
+ REG_F5,
+ REG_F6,
+ REG_F7,
+ REG_F8,
+ REG_F9,
+ REG_F10,
+ REG_F11,
+ REG_F12,
+ REG_F13,
+ REG_F14,
+ REG_F15,
+ REG_F16,
+ REG_F17,
+ REG_F18,
+ REG_F19,
+ REG_F20,
+ REG_F21,
+ REG_F22,
+ REG_F23,
+ REG_F24,
+ REG_F25,
+ REG_F26,
+ REG_F27,
+ REG_F28,
+ REG_F29,
+ REG_F30,
+ REG_FLAGS,
+ REG_FPFLAGS,
+ REG_Y,
+};
+static unsigned default_caller_saves[BITSET_SIZE_ELEMS(N_SPARC_REGISTERS)];
+
+static const unsigned returns_twice_saved[] = {
+ REG_SP,
+ REG_FRAME_POINTER,
+ REG_I7
+};
+static unsigned default_returns_twice_saves[BITSET_SIZE_ELEMS(N_SPARC_REGISTERS)];
/**
* Maps an input register representing the i'th register input
static void check_omit_fp(ir_node *node, void *env)
{
- bool *can_omit_fp = (bool*) env;
-
/* omit-fp is not possible if:
* - we have allocations on the stack
* - we have calls (with the exception of tail-calls once we support them)
if ((is_Alloc(node) && get_Alloc_where(node) == stack_alloc)
|| (is_Free(node) && get_Free_where(node) == stack_alloc)
|| is_Call(node)) {
+ bool *can_omit_fp = (bool*) env;
*can_omit_fp = false;
}
}
+static unsigned determine_n_float_regs(ir_mode *mode)
+{
+ unsigned bits = get_mode_size_bits(mode);
+ switch (bits) {
+ case 32:
+ return 1;
+ case 64:
+ return 2;
+ case 128:
+ return 4;
+ default:
+ panic("Unexpected floatingpoint mode %+F", mode);
+ }
+}
+
calling_convention_t *sparc_decide_calling_convention(ir_type *function_type,
ir_graph *irg)
{
- int stack_offset = 0;
- int n_param_regs = ARRAY_SIZE(param_regs);
- int n_float_result_regs = ARRAY_SIZE(float_result_regs);
- bool omit_fp = false;
- reg_or_stackslot_t *params;
- reg_or_stackslot_t *results;
- int n_params;
- int n_results;
- int i;
- int regnum;
- int float_regnum;
- calling_convention_t *cconv;
-
+ bool omit_fp = false;
if (irg != NULL) {
- const be_options_t *options = be_get_irg_options(irg);
- omit_fp = options->omit_fp;
- irg_walk_graph(irg, check_omit_fp, NULL, &omit_fp);
+ omit_fp = be_options.omit_fp;
+ /* our current vaarg handling needs the standard space to store the
+ * args 0-5 in it */
+ if (get_method_variadicity(function_type) == variadicity_variadic)
+ omit_fp = false;
+ if (omit_fp == true) {
+ irg_walk_graph(irg, check_omit_fp, NULL, &omit_fp);
+ }
+ }
+
+ mtp_additional_properties mtp
+ = get_method_additional_properties(function_type);
+ unsigned *caller_saves = rbitset_malloc(N_SPARC_REGISTERS);
+ if (mtp & mtp_property_returns_twice) {
+ rbitset_copy(caller_saves, default_returns_twice_saves,
+ N_SPARC_REGISTERS);
+ } else {
+ rbitset_copy(caller_saves, default_caller_saves, N_SPARC_REGISTERS);
}
/* determine how parameters are passed */
- n_params = get_method_n_params(function_type);
- regnum = 0;
- params = XMALLOCNZ(reg_or_stackslot_t, n_params);
+ int n_params = get_method_n_params(function_type);
+ int regnum = 0;
+ reg_or_stackslot_t *params = XMALLOCNZ(reg_or_stackslot_t, n_params);
- for (i = 0; i < n_params; ++i) {
+ int n_param_regs = ARRAY_SIZE(param_regs);
+ unsigned stack_offset = 0;
+ for (int i = 0; i < n_params; ++i) {
ir_type *param_type = get_method_param_type(function_type,i);
- ir_mode *mode = get_type_mode(param_type);
- int bits = get_mode_size_bits(mode);
- reg_or_stackslot_t *param = ¶ms[i];
+ ir_mode *mode;
+ int bits;
+ reg_or_stackslot_t *param;
+
+ if (is_compound_type(param_type))
+ panic("compound arguments not supported yet");
+
+ mode = get_type_mode(param_type);
+ bits = get_mode_size_bits(mode);
+ param = ¶ms[i];
+
+ if (i == 0 &&
+ (get_method_calling_convention(function_type) & cc_compound_ret)) {
+ assert(mode_is_reference(mode) && bits == 32);
+ /* special case, we have reserved space for this on the between
+ * type */
+ param->type = param_type;
+ param->offset = -SPARC_MIN_STACKSIZE+SPARC_AGGREGATE_RETURN_OFFSET;
+ continue;
+ }
if (regnum < n_param_regs) {
- const arch_register_t *reg = param_regs[regnum++];
+ const arch_register_t *reg = param_regs[regnum];
if (irg == NULL || omit_fp)
reg = map_i_to_o_reg(reg);
- param->reg0 = reg;
+ param->reg0 = reg;
+ param->req0 = reg->single_req;
+ param->reg_offset = regnum;
+ ++regnum;
} else {
param->type = param_type;
param->offset = stack_offset;
- /* increase offset 4 bytes so everything is aligned */
- stack_offset += bits > 32 ? bits/8 : 4;
+ /* increase offset by at least SPARC_REGISTER_SIZE bytes so everything is aligned */
+ stack_offset += bits > 8 * SPARC_REGISTER_SIZE ? bits / 8 : SPARC_REGISTER_SIZE;
continue;
}
/* we might need a 2nd 32bit component (for 64bit or double values) */
if (bits > 32) {
if (bits > 64)
- panic("only 32 and 64bit modes supported in sparc backend");
+ panic("only 32 and 64bit modes supported");
if (regnum < n_param_regs) {
- const arch_register_t *reg = param_regs[regnum++];
+ const arch_register_t *reg = param_regs[regnum];
if (irg == NULL || omit_fp)
reg = map_i_to_o_reg(reg);
- param->reg1 = reg;
+ param->reg1 = reg;
+ param->req1 = reg->single_req;
+ ++regnum;
} else {
ir_mode *regmode = param_regs[0]->reg_class->mode;
ir_type *type = get_type_for_mode(regmode);
param->type = type;
param->offset = stack_offset;
assert(get_mode_size_bits(regmode) == 32);
- stack_offset += 4;
+ stack_offset += SPARC_REGISTER_SIZE;
}
}
}
+ unsigned n_param_regs_used = regnum;
/* determine how results are passed */
- n_results = get_method_n_ress(function_type);
- regnum = 0;
- float_regnum = 0;
- results = XMALLOCNZ(reg_or_stackslot_t, n_results);
- for (i = 0; i < n_results; ++i) {
+ int n_results = get_method_n_ress(function_type);
+ unsigned float_regnum = 0;
+ unsigned n_reg_results = 0;
+ unsigned n_float_result_regs = ARRAY_SIZE(float_result_regs);
+ reg_or_stackslot_t *results = XMALLOCNZ(reg_or_stackslot_t, n_results);
+ regnum = 0;
+ for (int i = 0; i < n_results; ++i) {
ir_type *result_type = get_method_res_type(function_type, i);
ir_mode *result_mode = get_type_mode(result_type);
reg_or_stackslot_t *result = &results[i];
if (mode_is_float(result_mode)) {
- if (float_regnum >= n_float_result_regs) {
- panic("Too many float results for sparc backend");
+ unsigned n_regs = determine_n_float_regs(result_mode);
+ unsigned next_reg = round_up2(float_regnum, n_regs);
+
+ if (next_reg >= n_float_result_regs) {
+ panic("Too many float results");
} else {
- const arch_register_t *reg = float_result_regs[float_regnum++];
- result->reg0 = reg;
+ const arch_register_t *reg = float_result_regs[next_reg];
+ rbitset_clear(caller_saves, reg->global_index);
+ result->reg_offset = i;
+ if (n_regs == 1) {
+ result->req0 = reg->single_req;
+ } else if (n_regs == 2) {
+ result->req0 = &float_result_reqs_double[next_reg];
+ rbitset_clear(caller_saves, reg->global_index+1);
+ } else if (n_regs == 4) {
+ result->req0 = &float_result_reqs_quad[next_reg];
+ rbitset_clear(caller_saves, reg->global_index+1);
+ rbitset_clear(caller_saves, reg->global_index+2);
+ rbitset_clear(caller_saves, reg->global_index+3);
+ } else {
+ panic("invalid number of registers in result");
+ }
+ float_regnum = next_reg + n_regs;
+
+ ++n_reg_results;
}
} else {
if (get_mode_size_bits(result_mode) > 32) {
- panic("Results with more than 32bits not supported by sparc backend yet");
+ panic("Results with more than 32bits not supported yet");
}
if (regnum >= n_param_regs) {
- panic("Too many results for sparc backend");
+ panic("Too many results");
} else {
const arch_register_t *reg = param_regs[regnum++];
if (irg == NULL || omit_fp)
reg = map_i_to_o_reg(reg);
- result->reg0 = reg;
+ result->req0 = reg->single_req;
+ result->reg_offset = i;
+ rbitset_clear(caller_saves, reg->global_index);
+ ++n_reg_results;
}
}
}
- cconv = XMALLOCZ(calling_convention_t);
+ calling_convention_t *cconv = XMALLOCZ(calling_convention_t);
cconv->parameters = params;
cconv->param_stack_size = stack_offset;
+ cconv->n_param_regs = n_param_regs_used;
cconv->results = results;
cconv->omit_fp = omit_fp;
+ cconv->caller_saves = caller_saves;
+ cconv->n_reg_results = n_reg_results;
/* setup ignore register array */
if (irg != NULL) {
struct obstack *obst = &birg->obst;
size_t r;
- assert(birg->allocatable_regs == NULL);
birg->allocatable_regs = rbitset_obstack_alloc(obst, N_SPARC_REGISTERS);
rbitset_set_all(birg->allocatable_regs, N_SPARC_REGISTERS);
for (r = 0; r < n_ignores; ++r) {
{
free(cconv->parameters);
free(cconv->results);
+ free(cconv->caller_saves);
free(cconv);
}
+
+void sparc_cconv_init(void)
+{
+ for (size_t i = 0; i < ARRAY_SIZE(caller_saves); ++i) {
+ rbitset_set(default_caller_saves, caller_saves[i]);
+ }
+
+ rbitset_set_all(default_returns_twice_saves, N_SPARC_REGISTERS);
+ for (size_t i = 0; i < ARRAY_SIZE(returns_twice_saved); ++i) {
+ rbitset_clear(default_returns_twice_saves, returns_twice_saved[i]);
+ }
+ for (size_t i = 0; i < ARRAY_SIZE(ignore_regs); ++i) {
+ rbitset_clear(default_returns_twice_saves, ignore_regs[i]);
+ }
+
+ for (size_t i = 0; i < ARRAY_SIZE(float_result_reqs_double); i += 2) {
+ arch_register_req_t *req = &float_result_reqs_double[i];
+ *req = *float_result_regs[i]->single_req;
+ req->type |= arch_register_req_type_aligned;
+ req->width = 2;
+ }
+ for (size_t i = 0; i < ARRAY_SIZE(float_result_reqs_quad); i += 4) {
+ arch_register_req_t *req = &float_result_reqs_quad[i];
+ *req = *float_result_regs[i]->single_req;
+ req->type |= arch_register_req_type_aligned;
+ req->width = 4;
+ }
+}
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