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Optimize conditional jumps.

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The ecma_op_to_boolean return value is changed to bool for faster
evaluation, and no need to swap operandos of relational compare.

JerryScript-DCO-1.0-Signed-off-by: Zoltan Herczeg zherczeg.u-szeged@partner.samsung.com
This commit is contained in:
Zoltan Herczeg
2016-05-30 05:56:22 -07:00
parent 08c312bc55
commit f24be95f89
12 changed files with 149 additions and 193 deletions
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jerry-core/vm/vm.c
+9 -9
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@@ -1498,26 +1498,26 @@ vm_loop (vm_frame_ctx_t *frame_ctx_p) /**< frame context */
{
uint32_t opcode_flags = VM_OC_GROUP_GET_INDEX (opcode_data) - VM_OC_BRANCH_IF_TRUE;
last_completion_value = ecma_op_to_boolean (left_value);
bool boolean_value = ecma_op_to_boolean (left_value);
if (ecma_is_value_error (last_completion_value))
if (opcode_flags & VM_OC_BRANCH_IF_FALSE_FLAG)
{
goto error;
boolean_value = !boolean_value;
}
bool branch_if_false = (opcode_flags & VM_OC_BRANCH_IF_FALSE_FLAG);
if (last_completion_value == ecma_make_simple_value (branch_if_false ? ECMA_SIMPLE_VALUE_FALSE
: ECMA_SIMPLE_VALUE_TRUE))
if (boolean_value)
{
byte_code_p = byte_code_start_p + branch_offset;
if (opcode_flags & VM_OC_LOGICAL_BRANCH_FLAG)
{
left_value = ecma_make_simple_value (ECMA_SIMPLE_VALUE_UNDEFINED);
/* "Push" the left_value back to the stack. */
++stack_top_p;
continue;
}
}
break;
ecma_fast_free_value (left_value);
continue;
}
case VM_OC_PLUS:
{