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glsl: Extract ir_triop_bitfield_extract implementation to a separate function

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Signed-off-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Matt Turner <mattst88@gmail.com>
This commit is contained in:
Ian Romanick
2016-07-12 18:07:51 -07:00
parent 54ec6e1b8b
commit fe153309a8
1 changed files with 42 additions and 24 deletions
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66
src/compiler/glsl/ir_constant_expression.cpp
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@@ -537,6 +537,38 @@ ldexp_flush_subnormal(double x, int exp)
return !isnormal(result) ? copysign(0.0, x) : result;
}
static uint32_t
bitfield_extract_uint(uint32_t value, int offset, int bits)
{
if (bits == 0)
return 0;
else if (offset < 0 || bits < 0)
return 0; /* Undefined, per spec. */
else if (offset + bits > 32)
return 0; /* Undefined, per spec. */
else {
value <<= 32 - bits - offset;
value >>= 32 - bits;
return value;
}
}
static int32_t
bitfield_extract_int(int32_t value, int offset, int bits)
{
if (bits == 0)
return 0;
else if (offset < 0 || bits < 0)
return 0; /* Undefined, per spec. */
else if (offset + bits > 32)
return 0; /* Undefined, per spec. */
else {
value <<= 32 - bits - offset;
value >>= 32 - bits;
return value;
}
}
ir_constant *
ir_expression::constant_expression_value(struct hash_table *variable_context)
{
@@ -1605,34 +1637,20 @@ ir_expression::constant_expression_value(struct hash_table *variable_context)
memcpy(&data.u[0], &op[0]->value.d[0], sizeof(double));
break;
case ir_triop_bitfield_extract: {
case ir_triop_bitfield_extract:
for (unsigned c = 0; c < components; c++) {
int offset = op[1]->value.i[c];
int bits = op[2]->value.i[c];
if (bits == 0)
data.u[c] = 0;
else if (offset < 0 || bits < 0)
data.u[c] = 0; /* Undefined, per spec. */
else if (offset + bits > 32)
data.u[c] = 0; /* Undefined, per spec. */
else {
if (op[0]->type->base_type == GLSL_TYPE_INT) {
/* int so that the right shift will sign-extend. */
int value = op[0]->value.i[c];
value <<= 32 - bits - offset;
value >>= 32 - bits;
data.i[c] = value;
} else {
unsigned value = op[0]->value.u[c];
value <<= 32 - bits - offset;
value >>= 32 - bits;
data.u[c] = value;
}
switch (this->type->base_type) {
case GLSL_TYPE_UINT:
data.u[c] = bitfield_extract_uint(op[0]->value.u[c], op[1]->value.i[c], op[2]->value.i[c]);
break;
case GLSL_TYPE_INT:
data.i[c] = bitfield_extract_int(op[0]->value.i[c], op[1]->value.i[c], op[2]->value.i[c]);
break;
default:
assert(0);
}
}
break;
}
case ir_binop_ldexp:
for (unsigned c = 0; c < op[0]->type->components(); c++) {