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i965/nir: Do boolean resolves on GEN <= 5

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v2: A couple comment clean-ups from Matt

Reviewed-by: Matt Turner <mattst88@gmail.com>
This commit is contained in:
Jason Ekstrand 2015-03-17 11:49:04 -07:00
parent a55af2699f
commit 41d64fa184
1 changed files with 20 additions and 0 deletions
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20
src/mesa/drivers/dri/i965/brw_fs_nir.cpp
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@ -25,6 +25,7 @@
#include "glsl/ir_optimization.h"
#include "glsl/nir/glsl_to_nir.h"
#include "brw_fs.h"
#include "brw_nir.h"
static void
nir_optimize(nir_shader *nir)
@ -155,6 +156,14 @@ fs_visitor::emit_nir_code()
nir_convert_from_ssa(nir);
nir_validate_shader(nir);
/* This is the last pass we run before we start emitting stuff. It
* determines when we need to insert boolean resolves on Gen <= 5. We
* run it last because it stashes data in instr->pass_flags and we don't
* want that to be squashed by other NIR passes.
*/
if (brw->gen <= 5)
brw_nir_analyze_boolean_resolves(nir);
/* emit the arrays used for inputs and outputs - load/store intrinsics will
* be converted to reads/writes of these arrays
*/
@ -1261,6 +1270,17 @@ fs_visitor::nir_emit_alu(nir_alu_instr *instr)
default:
unreachable("unhandled instruction");
}
/* If we need to do a boolean resolve, replace the result with -(x & 1)
* to sign extend the low bit to 0/~0
*/
if (brw->gen <= 5 &&
(instr->instr.pass_flags & BRW_NIR_BOOLEAN_MASK) == BRW_NIR_BOOLEAN_NEEDS_RESOLVE) {
fs_reg masked = vgrf(glsl_type::int_type);
emit(AND(masked, result, fs_reg(1)));
masked.negate = true;
emit(MOV(result, masked));
}
}
fs_reg