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Improve registers reuse

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This commit is contained in:
Dmitry Stogov
2020-04-16 14:35:51 +03:00
parent 850feffac0
commit ea0110f0de
2 changed files with 9 additions and 5 deletions
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12
ext/opcache/jit/zend_jit.c
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@@ -1391,10 +1391,6 @@ static int zend_jit_try_allocate_free_reg(const zend_op_array *op_array, zend_ss
*/
available = ZEND_REGSET_DIFFERENCE(available, ZEND_REGSET_PRESERVED);
if (ZEND_REGSET_IS_EMPTY(available)) {
return 0;
}
/* Set freeUntilPos of all physical registers to maxInt */
for (i = 0; i < ZREG_NUM; i++) {
freeUntilPos[i] = 0xffffffff;
@@ -1432,6 +1428,10 @@ static int zend_jit_try_allocate_free_reg(const zend_op_array *op_array, zend_ss
}
}
if (hint == ZREG_NONE && ZEND_REGSET_IS_EMPTY(available)) {
return 0;
}
/* See "Linear Scan Register Allocation on SSA Form", Christian Wimmer and
Michael Franz, CGO'10 (2010), Figure 6. */
if (current->flags & ZREG_SPLIT) {
@@ -1519,6 +1519,10 @@ static int zend_jit_try_allocate_free_reg(const zend_op_array *op_array, zend_ss
return 1;
}
if (ZEND_REGSET_IS_EMPTY(available)) {
return 0;
}
pos = 0; reg = ZREG_NONE;
pos2 = 0; reg2 = ZREG_NONE;
low_priority_regs = *hints;

2
ext/opcache/jit/zend_jit_x86.dasc
View File

@@ -10947,7 +10947,7 @@ static zend_bool zend_jit_verify_return_type(dasm_State **Dst, const zend_op *op
static zend_bool zend_jit_may_reuse_reg(const zend_op *opline, const zend_ssa_op *ssa_op, zend_ssa *ssa, int def_var, int use_var)
{
if (ssa->var_info[def_var].type != ssa->var_info[use_var].type) {
if ((ssa->var_info[def_var].type & ~MAY_BE_GUARD) != (ssa->var_info[use_var].type & ~MAY_BE_GUARD)) {
return 0;
}