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__builtin_expect no-op

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Taken from David Mertens tcc branch on github
    https://github.com/run4flat/tinycc.git
This commit is contained in:
seyko 2016-04-16 12:41:53 +03:00
parent 5ee097fce9
commit e010b1396b
2 changed files with 38 additions and 0 deletions
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37
tccgen.c
View file

@ -84,6 +84,7 @@ static void block(int *bsym, int *csym, int *case_sym, int *def_sym, int case_re
static void decl_initializer_alloc(CType *type, AttributeDef *ad, int r, int has_init, int v, int scope); static void decl_initializer_alloc(CType *type, AttributeDef *ad, int r, int has_init, int v, int scope);
static int decl0(int l, int is_for_loop_init); static int decl0(int l, int is_for_loop_init);
static void expr_eq(void); static void expr_eq(void);
static void expr_lor_const(void);
static void unary_type(CType *type); static void unary_type(CType *type);
static void vla_runtime_type_size(CType *type, int *a); static void vla_runtime_type_size(CType *type, int *a);
static void vla_sp_restore(void); static void vla_sp_restore(void);
@ -3938,6 +3939,22 @@ ST_FUNC void unary(void)
vtop->type.t |= VT_UNSIGNED; vtop->type.t |= VT_UNSIGNED;
break; break;
case TOK_builtin_expect:
{
/* __builtin_expect is a no-op for now */
int saved_nocode_wanted;
next();
skip('(');
expr_eq();
skip(',');
saved_nocode_wanted = nocode_wanted;
nocode_wanted = 1;
expr_lor_const();
vpop();
nocode_wanted = saved_nocode_wanted;
skip(')');
}
break;
case TOK_builtin_types_compatible_p: case TOK_builtin_types_compatible_p:
{ {
CType type1, type2; CType type1, type2;
@ -4466,6 +4483,26 @@ static void expr_or(void)
} }
} }
/* XXX: fix this mess */
static void expr_land_const(void)
{
expr_or();
while (tok == TOK_LAND) {
next();
expr_or();
gen_op(TOK_LAND);
}
}
static void expr_lor_const(void)
{
expr_land_const();
while (tok == TOK_LOR) {
next();
expr_land_const();
gen_op(TOK_LOR);
}
}
static void expr_land(void) static void expr_land(void)
{ {
expr_or(); expr_or();

1
tcctok.h
View file

@ -131,6 +131,7 @@
DEF(TOK_builtin_constant_p, "__builtin_constant_p") DEF(TOK_builtin_constant_p, "__builtin_constant_p")
DEF(TOK_builtin_frame_address, "__builtin_frame_address") DEF(TOK_builtin_frame_address, "__builtin_frame_address")
DEF(TOK_builtin_return_address, "__builtin_return_address") DEF(TOK_builtin_return_address, "__builtin_return_address")
DEF(TOK_builtin_expect, "__builtin_expect")
#ifdef TCC_TARGET_X86_64 #ifdef TCC_TARGET_X86_64
#ifdef TCC_TARGET_PE #ifdef TCC_TARGET_PE
DEF(TOK_builtin_va_start, "__builtin_va_start") DEF(TOK_builtin_va_start, "__builtin_va_start")