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glsl_to_tgsi: implement ir_unop_logic_not using 1-x

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Since our logic values are 0.0 (false) and 1.0 (true), 1.0 - x accurately
implements logical not.

This is a port of commit 6ad08989d7 to glsl_to_tgsi.
This commit is contained in:
Bryan Cain 2011-08-17 10:01:30 -05:00
parent 112e68c503
commit 8c31bc7048
1 changed files with 11 additions and 1 deletions
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12
src/mesa/state_tracker/st_glsl_to_tgsi.cpp
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@ -1336,7 +1336,17 @@ glsl_to_tgsi_visitor::visit(ir_expression *ir)
switch (ir->operation) {
case ir_unop_logic_not:
emit(ir, TGSI_OPCODE_SEQ, result_dst, op[0], st_src_reg_for_type(result_dst.type, 0));
if (result_dst.type != GLSL_TYPE_FLOAT)
emit(ir, TGSI_OPCODE_SEQ, result_dst, op[0], st_src_reg_for_type(result_dst.type, 0));
else {
/* Previously 'SEQ dst, src, 0.0' was used for this. However, many
* older GPUs implement SEQ using multiple instructions (i915 uses two
* SGE instructions and a MUL instruction). Since our logic values are
* 0.0 and 1.0, 1-x also implements !x.
*/
op[0].negate = ~op[0].negate;
emit(ir, TGSI_OPCODE_ADD, result_dst, op[0], st_src_reg_for_float(1.0));
}
break;
case ir_unop_neg:
assert(result_dst.type == GLSL_TYPE_FLOAT || result_dst.type == GLSL_TYPE_INT);