glsl: Add constant evaluation of ir_binop_bfm.
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
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@ -1397,6 +1397,23 @@ ir_expression::constant_expression_value(struct hash_table *variable_context)
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break;
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break;
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}
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}
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case ir_binop_bfm: {
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int bits = op[0]->value.i[0];
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int offset = op[1]->value.i[0];
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for (unsigned c = 0; c < components; c++) {
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if (bits == 0)
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data.u[c] = op[0]->value.u[c];
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else if (offset < 0 || bits < 0)
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data.u[c] = 0; /* Undefined for bitfieldInsert, per spec. */
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else if (offset + bits > 32)
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data.u[c] = 0; /* Undefined for bitfieldInsert, per spec. */
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else
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data.u[c] = ((1 << bits) - 1) << offset;
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}
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break;
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}
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case ir_binop_ldexp:
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case ir_binop_ldexp:
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for (unsigned c = 0; c < components; c++) {
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for (unsigned c = 0; c < components; c++) {
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data.f[c] = ldexp(op[0]->value.f[c], op[1]->value.i[c]);
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data.f[c] = ldexp(op[0]->value.f[c], op[1]->value.i[c]);
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