From: Dmitry Stogov <dmitry@zend.com>
Date: Tue, 16 Jun 2020 11:04:05 +0000 (+0300)
Subject: Use "lea" to add/sub register with constant
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=77d0587fdbfdd89c901e695cf6f61659c19edaa8;p=php

Use "lea" to add/sub register with constant
---

diff --git a/ext/opcache/jit/zend_jit_x86.dasc b/ext/opcache/jit/zend_jit_x86.dasc
index 2a157c8c11..fb634378f2 100644
--- a/ext/opcache/jit/zend_jit_x86.dasc
+++ b/ext/opcache/jit/zend_jit_x86.dasc
@@ -3826,6 +3826,21 @@ static int zend_jit_math_long_long(dasm_State    **Dst,
 			is_power_of_two(Z_LVAL_P(Z_ZV(op2_addr))))) {
 		|	GET_ZVAL_LVAL result_reg, op1_addr
 		|	shr Ra(result_reg), floor_log2(Z_LVAL_P(Z_ZV(op2_addr)))
+	} else if (opcode == ZEND_ADD &&
+			!may_overflow &&
+			Z_MODE(op1_addr) == IS_REG &&
+			Z_MODE(op2_addr) == IS_CONST_ZVAL) {
+		|	lea Ra(result_reg), [Ra(Z_REG(op1_addr))+Z_LVAL_P(Z_ZV(op2_addr))]
+	} else if (opcode == ZEND_ADD &&
+			!may_overflow &&
+			Z_MODE(op2_addr) == IS_REG &&
+			Z_MODE(op1_addr) == IS_CONST_ZVAL) {
+		|	lea Ra(result_reg), [Ra(Z_REG(op2_addr))+Z_LVAL_P(Z_ZV(op1_addr))]
+	} else if (opcode == ZEND_SUB &&
+			!may_overflow &&
+			Z_MODE(op1_addr) == IS_REG &&
+			Z_MODE(op2_addr) == IS_CONST_ZVAL) {
+		|	lea Ra(result_reg), [Ra(Z_REG(op1_addr))-Z_LVAL_P(Z_ZV(op2_addr))]
 	} else {
 		|	GET_ZVAL_LVAL result_reg, op1_addr
 		if (same_ops && opcode != ZEND_DIV) {