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Micro optimizations of the virtual machine:

Browse Source 
- Branch argument information is encoded in the vm byte
   code data, so CBC flags are not loaded anymore
 - The free_flags variable is removed from the vm_loop
 - Two cases are removed from "get arguments", argument
   processing is simplified
 - The two opcode tables are merged to one
 - The VM_OC_POP opcode has no result, so the break is changed to continue.
 - The VM_OC_PUSH_NUMBER can use ecma_make_integer_value.

JerryScript-DCO-1.0-Signed-off-by: Zoltan Herczeg zherczeg.u-szeged@partner.samsung.com
This commit is contained in:
Zoltan Herczeg
2016-05-24 01:14:23 -07:00
parent be273d874f
commit ac3aa30c82
3 changed files with 130 additions and 170 deletions
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jerry-core/vm/vm.h
+19 -11
View File
@@ -42,6 +42,16 @@
* stack, etc.)
*/
/**
* Opcode has branch argument
*/
#define VM_OC_HAS_BRANCH_ARG 0x8000
/**
* Branch argument is a backward branch
*/
#define VM_OC_BACKWARD_BRANCH 0x4000
/**
* Position of "get arguments" opcode.
*/
@@ -50,7 +60,7 @@
/**
* Mask of "get arguments" opcode.
*/
#define VM_OC_GET_ARGS_MASK 0x1f
#define VM_OC_GET_ARGS_MASK 0x7
/**
* Generate the binary representation of a "get arguments" opcode.
@@ -60,7 +70,7 @@
/**
* Extract the "get arguments" opcode.
*/
#define VM_OC_GET_ARGS_GET_INDEX(O) (((O) >> VM_OC_GET_ARGS_SHIFT) & VM_OC_GET_ARGS_MASK)
#define VM_OC_GET_ARGS_INDEX(O) ((O) & (VM_OC_GET_ARGS_MASK << VM_OC_GET_ARGS_SHIFT))
/**
* Checks whether the result is stored somewhere.
@@ -73,16 +83,14 @@
typedef enum
{
VM_OC_GET_NONE = VM_OC_GET_ARGS_CREATE_INDEX (0), /**< do nothing */
VM_OC_GET_STACK = VM_OC_GET_ARGS_CREATE_INDEX (1), /**< pop one elemnet from the stack */
VM_OC_GET_STACK_STACK = VM_OC_GET_ARGS_CREATE_INDEX (2), /**< pop two elemnets from the stack */
VM_OC_GET_BYTE = VM_OC_GET_ARGS_CREATE_INDEX (3), /**< read a byte */
VM_OC_GET_STACK = VM_OC_GET_ARGS_CREATE_INDEX (1), /**< pop one element from the stack */
VM_OC_GET_STACK_STACK = VM_OC_GET_ARGS_CREATE_INDEX (2), /**< pop two elements from the stack */
VM_OC_GET_LITERAL = VM_OC_GET_ARGS_CREATE_INDEX (4), /**< resolve literal */
VM_OC_GET_STACK_LITERAL = VM_OC_GET_ARGS_CREATE_INDEX (5), /**< pop one elemnet from the stack
VM_OC_GET_LITERAL = VM_OC_GET_ARGS_CREATE_INDEX (3), /**< resolve literal */
VM_OC_GET_LITERAL_LITERAL = VM_OC_GET_ARGS_CREATE_INDEX (4), /**< resolve two literals */
VM_OC_GET_STACK_LITERAL = VM_OC_GET_ARGS_CREATE_INDEX (5), /**< pop one element from the stack
* and resolve a literal */
VM_OC_GET_LITERAL_BYTE = VM_OC_GET_ARGS_CREATE_INDEX (6), /**< pop one elemnet from stack and read a byte */
VM_OC_GET_LITERAL_LITERAL = VM_OC_GET_ARGS_CREATE_INDEX (7), /**< resolve two literals */
VM_OC_GET_THIS_LITERAL = VM_OC_GET_ARGS_CREATE_INDEX (8), /**< get this and resolve a literal */
VM_OC_GET_THIS_LITERAL = VM_OC_GET_ARGS_CREATE_INDEX (6), /**< get this and resolve a literal */
} vm_oc_get_types;
/**
@@ -229,7 +237,7 @@ typedef enum
/**
* Position of "put result" opcode.
*/
#define VM_OC_PUT_RESULT_SHIFT 12
#define VM_OC_PUT_RESULT_SHIFT 10
/**
* Mask of "put result" opcode.