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assembler/bdw: Set jip/uip offsets used by flow control instructions

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Signed-off-by: Xiang, Haihao <haihao.xiang@intel.com>
Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
This commit is contained in:
Xiang, Haihao 2013-02-22 11:14:06 +08:00 committed by Ben Widawsky
parent 2df4d3115a
commit 216163b44d
2 changed files with 88 additions and 47 deletions
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83
assembler/gram.y
View File

@ -117,6 +117,9 @@ static void set_direct_dst_operand(struct brw_reg *dst, struct brw_reg *reg,
static void set_direct_src_operand(struct src_operand *src, struct brw_reg *reg,
int type);
void set_branch_two_offsets(struct brw_program_instruction *insn, int jip_offset, int uip_offset);
void set_branch_one_offset(struct brw_program_instruction *insn, int jip_offset);
enum message_level {
WARN,
ERROR,
@ -3152,3 +3155,83 @@ static void set_direct_src_operand(struct src_operand *src, struct brw_reg *reg,
src->reg.abs = 0;
SWIZZLE(src->reg) = BRW_SWIZZLE_NOOP;
}
static inline int instruction_opcode(struct brw_program_instruction *insn)
{
if (IS_GENp(8))
return gen8_opcode(GEN8(insn));
else
return GEN(insn)->header.opcode;
}
/*
* return the offset used in native flow control (branch) instructions
*/
static inline int branch_offset(struct brw_program_instruction *insn, int offset)
{
/*
* bspec: Unlike other flow control instructions, the offset used by JMPI
* is relative to the incremented instruction pointer rather than the IP
* value for the instruction itself.
*/
if (instruction_opcode(insn) == BRW_OPCODE_JMPI)
offset--;
/*
* Gen4- bspec: the jump distance is in number of sixteen-byte units
* Gen5+ bspec: the jump distance is in number of eight-byte units
* Gen7.5+: the offset is in unit of 8bits for JMPI, 64bits for other flow
* control instructions
*/
if (gen_level >= 75 &&
(instruction_opcode(insn) == BRW_OPCODE_JMPI))
offset *= 16;
else if (gen_level >= 50)
offset *= 2;
return offset;
}
void set_branch_two_offsets(struct brw_program_instruction *insn, int jip_offset, int uip_offset)
{
int jip = branch_offset(insn, jip_offset);
int uip = branch_offset(insn, uip_offset);
assert(instruction_opcode(insn) != BRW_OPCODE_JMPI);
if (IS_GENp(8)) {
gen8_set_jip(GEN8(insn), jip);
gen8_set_uip(GEN8(insn), uip);
} else {
GEN(insn)->bits3.break_cont.jip = jip;
GEN(insn)->bits3.break_cont.uip = uip;
}
}
void set_branch_one_offset(struct brw_program_instruction *insn, int jip_offset)
{
int jip = branch_offset(insn, jip_offset);
if (IS_GENp(8)) {
gen8_set_jip(GEN8(insn), jip);
} else if (IS_GENx(7)) {
/* Gen7 JMPI Restrictions in bspec:
* The JIP data type must be Signed DWord
*/
if (instruction_opcode(insn) == BRW_OPCODE_JMPI)
GEN(insn)->bits3.JIP = jip;
else
GEN(insn)->bits3.break_cont.jip = jip;
} else if (IS_GENx(6)) {
if ((instruction_opcode(insn) == BRW_OPCODE_CALL) ||
(instruction_opcode(insn) == BRW_OPCODE_JMPI))
GEN(insn)->bits3.JIP = jip;
else
GEN(insn)->bits1.branch_gen6.jump_count = jip; // for CASE,ELSE,FORK,IF,WHILE
} else {
GEN(insn)->bits3.JIP = jip;
if (instruction_opcode(insn) == BRW_OPCODE_ELSE)
GEN(insn)->bits3.break_cont.uip = 1; // Set the istack pop count, which must always be 1.
}
}

52
assembler/main.c
View File

@ -38,6 +38,8 @@
#include "brw_eu.h"
extern FILE *yyin;
extern void set_branch_two_offsets(struct brw_program_instruction *insn, int jip_offset, int uip_offset);
extern void set_branch_one_offset(struct brw_program_instruction *insn, int jip_offset);
long int gen_level = 40;
int advanced_flag = 0; /* 0: in unit of byte, 1: in unit of data element size */
@ -86,16 +88,6 @@ static const struct option longopts[] = {
{ NULL, 0, NULL, 0 }
};
// jump distance used in branch instructions as JIP or UIP
static int jump_distance(int offset)
{
// Gen4- bspec: the jump distance is in number of sixteen-byte units
// Gen5+ bspec: the jump distance is in number of eight-byte units
if(IS_GENp(5))
offset *= 2;
return offset;
}
static void usage(void)
{
fprintf(stderr, "usage: intel-gen4asm [options] inputfile\n");
@ -438,7 +430,6 @@ int main(int argc, char **argv)
for (entry = compiled_program.first; entry; entry = entry->next) {
struct relocation *reloc = &entry->reloc;
struct brw_instruction *inst = &entry->insn.gen;
if (!is_relocatable(entry))
continue;
@ -449,43 +440,10 @@ int main(int argc, char **argv)
if (reloc->second_reloc_target)
reloc->second_reloc_offset = label_to_addr(reloc->second_reloc_target, entry->inst_offset) - entry->inst_offset;
if (reloc->second_reloc_offset) {
// this is a branch instruction with two offset arguments
inst->bits3.break_cont.jip = jump_distance(reloc->first_reloc_offset);
inst->bits3.break_cont.uip = jump_distance(reloc->second_reloc_offset);
if (reloc->second_reloc_offset) { // this is a branch instruction with two offset arguments
set_branch_two_offsets(entry, reloc->first_reloc_offset, reloc->second_reloc_offset);
} else if (reloc->first_reloc_offset) {
// this is a branch instruction with one offset argument
int offset = reloc->first_reloc_offset;
/* bspec: Unlike other flow control instructions, the offset used by JMPI is relative to the incremented instruction pointer rather than the IP value for the instruction itself. */
int is_jmpi = inst->header.opcode == BRW_OPCODE_JMPI; // target relative to the post-incremented IP, so delta == 1 if JMPI
if(is_jmpi)
offset --;
offset = jump_distance(offset);
if (is_jmpi && (gen_level == 75))
offset = offset * 8;
if(!IS_GENp(6)) {
inst->bits3.JIP = offset;
if(inst->header.opcode == BRW_OPCODE_ELSE)
inst->bits3.break_cont.uip = 1; /* Set the istack pop count, which must always be 1. */
} else if(IS_GENx(6)) {
/* TODO: endif JIP pos is not in Gen6 spec. may be bits1 */
int opcode = inst->header.opcode;
if(opcode == BRW_OPCODE_CALL || opcode == BRW_OPCODE_JMPI)
inst->bits3.JIP = offset; // for CALL, JMPI
else
inst->bits1.branch_gen6.jump_count = offset; // for CASE,ELSE,FORK,IF,WHILE
} else if(IS_GENp(7)) {
int opcode = inst->header.opcode;
/* Gen7 JMPI Restrictions in bspec:
* The JIP data type must be Signed DWord
*/
if(opcode == BRW_OPCODE_JMPI)
inst->bits3.JIP = offset;
else
inst->bits3.break_cont.jip = offset;
}
set_branch_one_offset(entry, reloc->first_reloc_offset);
}
}