/* $NetBSD: msg_267.c,v 1.9 2025/02/20 20:33:10 rillig Exp $ */
# 3 "msg_267.c"
// Test for message: shift amount %u equals bit-size of '%s' [267]
/* lint1-extra-flags: -X 351 */
int
shr32(unsigned int x)
{
/* expect+1: warning: shift amount 32 equals bit-size of 'unsigned int' [267] */
return x >> 32;
}
int
shl32(unsigned int x)
{
/* expect+1: warning: shift amount 32 equals bit-size of 'unsigned int' [267] */
return x << 32;
}
/*
*
https://gcc.gnu.org/onlinedocs/gccint/Machine-Modes.html
*/
unsigned
function(unsigned __attribute__((mode(TI))) arg)
{
return (arg >> 32) & 3;
}
unsigned
shift_bit_field(void)
{
struct {
unsigned bit_field:18;
} s = { 12345 };
/*
* A warning may be useful here for '>>' with a shift amount >= 18.
*
* For '<<' and bit-size <= 31, a warning only makes sense for shift
* amounts >= 31, as it is legitimate to rely on the default integer
* promotions of the left-hand operand. The default integer promotion
* turns the type into 'int', not 'unsigned int', therefore the 31.
* Using the same warning text would be confusing though.
*
* For '<<' and bit-size == 32, the standard case applies.
*
* As of 2022-08-19, Clang-tidy doesn't warn about any of these.
*/
return
(s.bit_field >> 17) &
(s.bit_field >> 18) &
(s.bit_field >> 19) &
(s.bit_field >> 31) &
// When promoting 'unsigned int:18', the target type is 'int', as
// it can represent all possible values; this is a bit misleading
// as its sign bit is always 0.
/* expect+1: warning: shift amount 32 equals bit-size of 'int:19' [267] */
(s.bit_field >> 32) &
// When promoting 'unsigned int:18', the target type is 'int', as
// it can represent all possible values; this is a bit misleading
// as its sign bit is always 0.
/* expect+1: warning: shift amount 33 is greater than bit-size 32 of 'int' [122] */
(s.bit_field >> 33) &
(s.bit_field << 17) &
(s.bit_field << 18) &
(s.bit_field << 19) &
(s.bit_field << 31) &
// When promoting 'unsigned int:18', the target type is 'int', as
// it can represent all possible values; this is a bit misleading
// as its sign bit is always 0.
/* expect+1: warning: shift amount 32 equals bit-size of 'int:19' [267] */
(s.bit_field << 32) &
// When promoting 'unsigned int:18', the target type is 'int', as
// it can represent all possible values; this is a bit misleading
// as its sign bit is always 0.
/* expect+1: warning: shift amount 33 is greater than bit-size 32 of 'int' [122] */
(s.bit_field << 33) &
15;
}
