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drc: dumb detection of writes to current block

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This commit is contained in:
notaz 2013-07-28 19:19:05 +03:00
parent 405dfdd77f
commit ee5f7e9936
1 changed files with 21 additions and 1 deletions
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22
cpu/sh2/compiler.c
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@ -3287,6 +3287,7 @@ void scan_block(u32 base_pc, int is_slave, u8 *op_flags, u32 *end_pc_out,
u16 *dr_pc_base; u16 *dr_pc_base;
u32 pc, op, tmp; u32 pc, op, tmp;
u32 end_pc, end_literals = 0; u32 end_pc, end_literals = 0;
u32 lowest_mova = 0;
struct op_data *opd; struct op_data *opd;
int next_is_delay = 0; int next_is_delay = 0;
int end_block = 0; int end_block = 0;
@ -3948,8 +3949,13 @@ void scan_block(u32 base_pc, int is_slave, u8 *op_flags, u32 *end_pc_out,
tmp = 0; tmp = 0;
} }
opd->dest = BITMASK1(SHR_R0); opd->dest = BITMASK1(SHR_R0);
if (tmp) if (tmp) {
opd->imm = (tmp + 2 + (op & 0xff) * 4) & ~3; opd->imm = (tmp + 2 + (op & 0xff) * 4) & ~3;
if (opd->imm >= base_pc) {
if (lowest_mova == 0 || opd->imm < lowest_mova)
lowest_mova = opd->imm;
}
}
break; break;
case 0x0800: // TST #imm,R0 11001000iiiiiiii case 0x0800: // TST #imm,R0 11001000iiiiiiii
opd->source = BITMASK1(SHR_R0); opd->source = BITMASK1(SHR_R0);
@ -4059,6 +4065,20 @@ void scan_block(u32 base_pc, int is_slave, u8 *op_flags, u32 *end_pc_out,
if (end_literals < end_pc) if (end_literals < end_pc)
end_literals = end_pc; end_literals = end_pc;
// end_literals is used to decide to inline a literal or not
// XXX: need better detection if this actually is used in write
if (lowest_mova >= base_pc) {
if (lowest_mova < end_literals) {
dbg(1, "mova for %08x, block %08x", lowest_mova, base_pc);
end_literals = end_pc;
}
if (lowest_mova < end_pc) {
dbg(1, "warning: mova inside of blk for %08x, block %08x",
lowest_mova, base_pc);
end_literals = end_pc;
}
}
*end_pc_out = end_pc; *end_pc_out = end_pc;
if (end_literals_out != NULL) if (end_literals_out != NULL)
*end_literals_out = end_literals; *end_literals_out = end_literals;