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Introduce CBC_MOV_IDENT opcode to improve performance (#3020)

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After this patch CBC_ASSIGN_SET_IDENT is transformed to CBC_MOV_IDENT if the opcode has register stored literal argument.

JerryScript-DCO-1.0-Signed-off-by: Robert Fancsik frobert@inf.u-szeged.hu
This commit is contained in:
Robert Fancsik
2019-08-26 15:59:27 +02:00
committed by Dániel Bátyai
parent 996459714c
commit 3af0079a0e
4 changed files with 27 additions and 5 deletions
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jerry-core/parser/js/js-parser.c
+11 -5
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@@ -1863,6 +1863,8 @@ parser_post_processing (parser_context_t *context_p) /**< context */
page_p = context_p->byte_code.first_p;
offset = 0;
real_offset = 0;
uint8_t last_register_index = (uint8_t) JERRY_MIN (context_p->register_count,
(PARSER_MAXIMUM_NUMBER_OF_REGISTERS - 1));
while (page_p != last_page_p || offset < last_position)
{
@@ -1943,11 +1945,6 @@ parser_post_processing (parser_context_t *context_p) /**< context */
#endif /* ENABLED (JERRY_LINE_INFO) */
}
if (flags & CBC_HAS_BRANCH_ARG)
{
*branch_mark_p |= CBC_HIGHEST_BIT_MASK;
}
/* Only literal and call arguments can be combined. */
JERRY_ASSERT (!(flags & CBC_HAS_BRANCH_ARG)
|| !(flags & (CBC_HAS_BYTE_ARG | CBC_HAS_LITERAL_ARG)));
@@ -1956,6 +1953,7 @@ parser_post_processing (parser_context_t *context_p) /**< context */
{
uint8_t first_byte = page_p->bytes[offset];
uint8_t *opcode_pos_p = dst_p - 1;
*dst_p++ = first_byte;
real_offset++;
PARSER_NEXT_BYTE_UPDATE (page_p, offset, real_offset);
@@ -1980,6 +1978,11 @@ parser_post_processing (parser_context_t *context_p) /**< context */
}
else
{
if (opcode == CBC_ASSIGN_SET_IDENT && JERRY_LIKELY (first_byte < last_register_index))
{
*opcode_pos_p = CBC_MOV_IDENT;
}
break;
}
}
@@ -1990,10 +1993,12 @@ parser_post_processing (parser_context_t *context_p) /**< context */
*dst_p++ = page_p->bytes[offset];
real_offset++;
PARSER_NEXT_BYTE_UPDATE (page_p, offset, real_offset);
continue;
}
if (flags & CBC_HAS_BRANCH_ARG)
{
*branch_mark_p |= CBC_HIGHEST_BIT_MASK;
bool prefix_zero = true;
/* The leading zeroes are dropped from the stream. */
@@ -2020,6 +2025,7 @@ parser_post_processing (parser_context_t *context_p) /**< context */
*dst_p++ = page_p->bytes[offset];
real_offset++;
PARSER_NEXT_BYTE_UPDATE (page_p, offset, real_offset);
continue;
}
}