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| author | Denys Vlasenko | 2023-06-28 14:18:35 +0200 |
|---|---|---|
| committer | Denys Vlasenko | 2023-06-28 14:18:35 +0200 |
| commit | 800207b90a4f5f78cbe65a0f4b3ecd3b93abbd7d (patch) | |
| tree | c78ee209986946838faf337bf997c2f6fb7d84f7 /shell | |
| parent | e619a25a551ac6a5f215005166371074a9e2816f (diff) | |
| download | busybox-800207b90a4f5f78cbe65a0f4b3ecd3b93abbd7d.zip busybox-800207b90a4f5f78cbe65a0f4b3ecd3b93abbd7d.tar.gz | |
shell/math: code shrink
function old new delta
arith_apply 1015 1023 +8
evaluate_string 1309 1295 -14
.rodata 105344 105321 -23
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 1/2 up/down: 8/-37) Total: -29 bytes
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Diffstat (limited to 'shell')
| -rw-r--r-- | shell/math.c | 18 |
1 files changed, 10 insertions, 8 deletions
diff --git a/shell/math.c b/shell/math.c index 9e81d60..e15b014 100644 --- a/shell/math.c +++ b/shell/math.c @@ -141,6 +141,7 @@ typedef unsigned char operator; * but there are 11 of them, which doesn't fit into 3 bits for unique id. * Abusing another precedence level: */ +#define PREC_ASSIGN1 2 #define TOK_ASSIGN tok_decl(2,0) #define TOK_AND_ASSIGN tok_decl(2,1) #define TOK_OR_ASSIGN tok_decl(2,2) @@ -150,11 +151,12 @@ typedef unsigned char operator; #define TOK_LSHIFT_ASSIGN tok_decl(2,6) #define TOK_RSHIFT_ASSIGN tok_decl(2,7) +#define PREC_ASSIGN2 3 #define TOK_MUL_ASSIGN tok_decl(3,0) #define TOK_DIV_ASSIGN tok_decl(3,1) #define TOK_REM_ASSIGN tok_decl(3,2) -#define fix_assignment_prec(prec) do { if (prec == 3) prec = 2; } while (0) +#define fix_assignment_prec(prec) do { prec -= (prec == 3); } while (0) /* Ternary conditional operator is right associative too */ /* @@ -211,25 +213,25 @@ typedef unsigned char operator; #define TOK_UPLUS tok_decl(UNARYPREC+1,1) #define PREC_PRE (UNARYPREC+2) -#define TOK_PRE_INC tok_decl(PREC_PRE, 0) -#define TOK_PRE_DEC tok_decl(PREC_PRE, 1) +#define TOK_PRE_INC tok_decl(PREC_PRE,0) +#define TOK_PRE_DEC tok_decl(PREC_PRE,1) #define PREC_POST (UNARYPREC+3) -#define TOK_POST_INC tok_decl(PREC_POST, 0) -#define TOK_POST_DEC tok_decl(PREC_POST, 1) +#define TOK_POST_INC tok_decl(PREC_POST,0) +#define TOK_POST_DEC tok_decl(PREC_POST,1) /* TOK_VALUE marks a number, name, name++/name--, or (EXPR): * IOW: something which can be used as the left side of a binary op. * Since it's never pushed to opstack, its precedence does not matter. */ -#define TOK_VALUE tok_decl(PREC_POST, 2) +#define TOK_VALUE tok_decl(PREC_POST,2) static int is_assign_op(operator op) { operator prec = PREC(op); - fix_assignment_prec(prec); - return prec == PREC(TOK_ASSIGN) + return prec == PREC_ASSIGN1 + || prec == PREC_ASSIGN2 || prec == PREC_PRE || prec == PREC_POST; } |