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glsl: Extract ir_quadop_bitfield_insert 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 18:11:29 -07:00
parent fe153309a8
commit ea05a72258
1 changed files with 23 additions and 25 deletions
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48
src/compiler/glsl/ir_constant_expression.cpp
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@@ -569,6 +569,26 @@ bitfield_extract_int(int32_t value, int offset, int bits)
} }
} }
static uint32_t
bitfield_insert(uint32_t base, uint32_t insert, int offset, int bits)
{
if (bits == 0)
return base;
else if (offset < 0 || bits < 0)
return 0; /* Undefined, per spec. */
else if (offset + bits > 32)
return 0; /* Undefined, per spec. */
else {
unsigned insert_mask = ((1ull << bits) - 1) << offset;
insert <<= offset;
insert &= insert_mask;
base &= ~insert_mask;
return base | insert;
}
}
ir_constant * ir_constant *
ir_expression::constant_expression_value(struct hash_table *variable_context) ir_expression::constant_expression_value(struct hash_table *variable_context)
{ {
@@ -1744,32 +1764,10 @@ ir_expression::constant_expression_value(struct hash_table *variable_context)
break; break;
} }
case ir_quadop_bitfield_insert: { case ir_quadop_bitfield_insert:
for (unsigned c = 0; c < components; c++) { for (unsigned c = 0; c < components; c++)
int offset = op[2]->value.i[c]; data.u[c] = bitfield_insert(op[0]->value.u[c], op[1]->value.u[c], op[2]->value.i[c], op[3]->value.i[c]);
int bits = op[3]->value.i[c];
if (bits == 0)
data.u[c] = op[0]->value.u[c];
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 {
unsigned insert_mask = ((1ull << bits) - 1) << offset;
unsigned insert = op[1]->value.u[c];
insert <<= offset;
insert &= insert_mask;
unsigned base = op[0]->value.u[c];
base &= ~insert_mask;
data.u[c] = base | insert;
}
}
break; break;
}
case ir_quadop_vector: case ir_quadop_vector:
for (unsigned c = 0; c < this->type->vector_elements; c++) { for (unsigned c = 0; c < this->type->vector_elements; c++) {