uclamp.c File Reference

Implements the OP_UCLAMP opcode for unsigned N-bit wrapping. More...

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Functions
	if (bits<=0)
else	if (bits >=64)
	push_value (vm, make_int((int64_t) wrapped))
	free_value (v)

Variables
case	OP_UCLAMP
int	bits = inst.operand
int64_t	vi = (v.type == VAL_INT) ? v.i : 0
uint64_t	mask
	else
uint64_t	wrapped = ((uint64_t)vi) & mask
	break

Detailed Description

Implements the OP_UCLAMP opcode for unsigned N-bit wrapping.

This VM opcode masks an integer to the lower N bits (N taken from the instruction operand), effectively performing an unsigned wrap-around into the range [0 .. 2^N - 1].

Stack contract:

• Pops: value (int)
• Pushes: value (int)

Definition in file uclamp.c.

Function Documentation

free_value()

free_value

(

v

)

if() [1/2]

else if

(

bits >=

64

)

Definition at line 32 of file uclamp.c.

if() [2/2]

if

(

bits<=

0

)

Definition at line 30 of file uclamp.c.

push_value()

push_value	(	vm	,
		make_int((int64_t) wrapped)	)

Variable Documentation

bits

int bits = inst.operand

Definition at line 26 of file uclamp.c.

break

break

Definition at line 41 of file uclamp.c.

else

else

Initial value:

{
mask = (1ULL << bits) - 1ULL

Definition at line 34 of file uclamp.c.

mask

uint64_t mask

Definition at line 29 of file uclamp.c.

OP_UCLAMP

case OP_UCLAMP

Definition at line 23 of file uclamp.c.

vi

int64_t vi = (v.type == VAL_INT) ? v.i : 0

Definition at line 27 of file uclamp.c.

wrapped

uint64_t wrapped = ((uint64_t)vi) & mask

Definition at line 38 of file uclamp.c.