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authorDenys Vlasenko2018-12-05 19:37:19 +0100
committerDenys Vlasenko2018-12-05 19:37:19 +0100
commit6543758b13029509a6b437657eab276045cf7ae0 (patch)
tree1150127ddbbc9d6e231806798e0d7dc4de7f16af /miscutils/bc.c
parentf381a88234c3fd05177dddceb4da604c7e9462d1 (diff)
downloadbusybox-6543758b13029509a6b437657eab276045cf7ae0.zip
busybox-6543758b13029509a6b437657eab276045cf7ae0.tar.gz
bc: code shrink
function old new delta bc_parse_operator 181 184 +3 bc_parse_ops 50 25 -25 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 1/1 up/down: 3/-25) Total: -22 bytes Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Diffstat (limited to 'miscutils/bc.c')
-rw-r--r--miscutils/bc.c37
1 files changed, 18 insertions, 19 deletions
diff --git a/miscutils/bc.c b/miscutils/bc.c
index 073a113..9a3bc27 100644
--- a/miscutils/bc.c
+++ b/miscutils/bc.c
@@ -627,11 +627,6 @@ typedef struct BcLex {
BC_PARSE_FLAG_LOOP | BC_PARSE_FLAG_LOOP_INNER | BC_PARSE_FLAG_IF | \
BC_PARSE_FLAG_ELSE | BC_PARSE_FLAG_IF_END)))
-typedef struct BcOp {
- char prec;
- bool left;
-} BcOp;
-
typedef struct BcParseNext {
uint32_t len;
BcLexType tokens[4];
@@ -822,18 +817,22 @@ static const bool bc_parse_exprs[] = {
};
// This is an array of data for operators that correspond to token types.
-static const BcOp bc_parse_ops[] = {
- { 0, false }, { 0, false },
- { 1, false },
- { 2, false },
- { 3, true }, { 3, true }, { 3, true },
- { 4, true }, { 4, true },
- { 6, true }, { 6, true }, { 6, true }, { 6, true }, { 6, true }, { 6, true },
- { 1, false },
- { 7, true }, { 7, true },
- { 5, false }, { 5, false }, { 5, false }, { 5, false }, { 5, false },
- { 5, false }, { 5, false },
+static const uint8_t bc_parse_ops[] = {
+#define OP(p,l) ((int)(l) * 0x10 + (p))
+ OP(0, false), OP( 0, false ),
+ OP(1, false),
+ OP(2, false),
+ OP(3, true ), OP( 3, true ), OP( 3, true ),
+ OP(4, true ), OP( 4, true ),
+ OP(6, true ), OP( 6, true ), OP( 6, true ), OP( 6, true ), OP( 6, true ), OP( 6, true ),
+ OP(1, false),
+ OP(7, true ), OP( 7, true ),
+ OP(5, false), OP( 5, false ), OP( 5, false ), OP( 5, false ), OP( 5, false ),
+ OP(5, false), OP( 5, false ),
+#undef OP
};
+#define bc_parse_op_PREC(i) (bc_parse_ops[i] & 0x0f)
+#define bc_parse_op_LEFT(i) (bc_parse_ops[i] & 0x10)
// These identify what tokens can come after expressions in certain cases.
static const BcParseNext bc_parse_next_expr =
@@ -3624,15 +3623,15 @@ static BcStatus bc_parse_operator(BcParse *p, BcLexType type, size_t start,
{
BcStatus s = BC_STATUS_SUCCESS;
BcLexType t;
- char l, r = bc_parse_ops[type - BC_LEX_OP_INC].prec;
- bool left = bc_parse_ops[type - BC_LEX_OP_INC].left;
+ char l, r = bc_parse_op_PREC(type - BC_LEX_OP_INC);
+ bool left = bc_parse_op_LEFT(type - BC_LEX_OP_INC);
while (p->ops.len > start) {
t = BC_PARSE_TOP_OP(p);
if (t == BC_LEX_LPAREN) break;
- l = bc_parse_ops[t - BC_LEX_OP_INC].prec;
+ l = bc_parse_op_PREC(t - BC_LEX_OP_INC);
if (l >= r && (l != r || !left)) break;
bc_parse_push(p, BC_PARSE_TOKEN_INST(t));