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When allocating a read register, prioritise registers that will not be used again.

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This commit is contained in:
SarahW 2018-12-17 19:40:09 +00:00
commit b26432caa8
1 changed files with 13 additions and 4 deletions
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17
src/codegen_reg.c
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@ -490,20 +490,29 @@ ir_host_reg_t codegen_reg_alloc_read_reg(codeblock_t *block, ir_reg_t ir_reg, in
if (c == reg_set->nr_regs)
{
/*No unused registers. Search for an unlocked register*/
/*No unused registers. Search for an unlocked register with no pending reads*/
for (c = 0; c < reg_set->nr_regs; c++)
{
if (!(reg_set->locked & (1 << c)))
if (!(reg_set->locked & (1 << c)) && !ir_get_get_refcount(reg_set->regs[c]))
break;
}
if (c == reg_set->nr_regs)
fatal("codegen_reg_alloc_read_reg - out of registers\n");
{
/*Search for any unlocked register*/
for (c = 0; c < reg_set->nr_regs; c++)
{
if (!(reg_set->locked & (1 << c)))
break;
}
if (c == reg_set->nr_regs)
fatal("codegen_reg_alloc_read_reg - out of registers\n");
}
if (reg_set->dirty[c])
codegen_reg_writeback(reg_set, block, c, 1);
// pclog(" load %i\n", c);
codegen_reg_load(reg_set, block, c, ir_reg);
reg_set->locked |= (1 << c);
// fatal("codegen_reg_alloc_read_reg - read %i.%i to %i\n", ir_reg.reg,ir_reg.version, c);
reg_set->locked |= (1 << c);
// codegen_reg_writeback(block, c);
reg_set->dirty[c] = 0;
}