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glsl: Extract ir_binop_ldexp 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 17:49:02 -07:00
parent 6d5fe1815c
commit 54ec6e1b8b
1 changed files with 28 additions and 11 deletions
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39
src/compiler/glsl/ir_constant_expression.cpp
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@@ -519,6 +519,24 @@ find_msb_int(int32_t v)
return find_msb_uint(v < 0 ? ~v : v);
}
static float
ldexpf_flush_subnormal(float x, int exp)
{
const float result = ldexpf(x, exp);
/* Flush subnormal values to zero. */
return !isnormal(result) ? copysignf(0.0f, x) : result;
}
static double
ldexp_flush_subnormal(double x, int exp)
{
const double result = ldexp(x, exp);
/* Flush subnormal values to zero. */
return !isnormal(result) ? copysign(0.0, x) : result;
}
ir_constant *
ir_expression::constant_expression_value(struct hash_table *variable_context)
{
@@ -1617,17 +1635,16 @@ ir_expression::constant_expression_value(struct hash_table *variable_context)
}
case ir_binop_ldexp:
for (unsigned c = 0; c < components; c++) {
if (op[0]->type->base_type == GLSL_TYPE_DOUBLE) {
data.d[c] = ldexp(op[0]->value.d[c], op[1]->value.i[c]);
/* Flush subnormal values to zero. */
if (!isnormal(data.d[c]))
data.d[c] = copysign(0.0, op[0]->value.d[c]);
} else {
data.f[c] = ldexpf(op[0]->value.f[c], op[1]->value.i[c]);
/* Flush subnormal values to zero. */
if (!isnormal(data.f[c]))
data.f[c] = copysignf(0.0f, op[0]->value.f[c]);
for (unsigned c = 0; c < op[0]->type->components(); c++) {
switch (this->type->base_type) {
case GLSL_TYPE_FLOAT:
data.f[c] = ldexpf_flush_subnormal(op[0]->value.f[c], op[1]->value.i[c]);
break;
case GLSL_TYPE_DOUBLE:
data.d[c] = ldexp_flush_subnormal(op[0]->value.d[c], op[1]->value.i[c]);
break;
default:
assert(0);
}
}
break;