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mesa/st: only convert AND(a, NOT(b)) into MAD when not using native integers

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Native integers imply a somewhat different handling of booleans. Instead
of being 1.0/0.0 floats, they are 0 (true) / -1 (false) integers. As such
the original optimization no longer applies.

Reported-by: Glenn Kennard <glenn.kennard@gmail.com>
Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Cc: "10.2" <mesa-stable@lists.freedesktop.org>
This commit is contained in:
Ilia Mirkin 2014-08-03 01:27:32 -04:00
parent 152006e149
commit 7b3d0a9a1e
1 changed files with 1 additions and 1 deletions
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2
src/mesa/state_tracker/st_glsl_to_tgsi.cpp
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@ -1354,7 +1354,7 @@ glsl_to_tgsi_visitor::visit(ir_expression *ir)
/* Quick peephole: Emit OPCODE_MAD(-a, -b, a) instead of AND(a, NOT(b))
*/
if (ir->operation == ir_binop_logic_and) {
if (!native_integers && ir->operation == ir_binop_logic_and) {
if (try_emit_mad_for_and_not(ir, 1))
return;
if (try_emit_mad_for_and_not(ir, 0))