---
src/compiler/nir/nir.h | 11 +++++++++++
src/compiler/nir/nir_clone.c | 1 +
src/compiler/nir/nir_print.c | 2 ++
3 files changed, 14 insertions(+)
diff --git a/src/compiler/nir/nir.h b/src/compiler/nir/nir.h
index 34f31eb..94b981b 100644
--- a/src/compiler/nir/nir.h
+++ b/src/compiler/nir/nir.h
@@ -671,6 +671,17 @@ extern const nir_op_info nir_op_infos[nir_num_opcodes];
typedef struct nir_alu_instr {
nir_instr instr;
nir_op op;
+
+ /** Indicates that this ALU instruction generates an exact value
+ *
+ * This is kind-of a mixture of GLSL "precise" and "invariant" and not
+ * really equivalent to either. This indicates that the value generated by
+ * this operation is high-precision and any code transformations that touch
+ * it must ensure that the resulting value is bit-for-bit identical to the
+ * original.
+ */
+ bool exact;
+
nir_alu_dest dest;
nir_alu_src src[];
} nir_alu_instr;
diff --git a/src/compiler/nir/nir_clone.c b/src/compiler/nir/nir_clone.c
index 198ca8b..90eefa7 100644
--- a/src/compiler/nir/nir_clone.c
+++ b/src/compiler/nir/nir_clone.c
@@ -303,6 +303,7 @@ static nir_alu_instr *
clone_alu(clone_state *state, const nir_alu_instr *alu)
{
nir_alu_instr *nalu = nir_alu_instr_create(state->ns, alu->op);
+ nalu->exact = alu->exact;
__clone_dst(state, &nalu->instr, &nalu->dest.dest, &alu->dest.dest);
nalu->dest.saturate = alu->dest.saturate;
diff --git a/src/compiler/nir/nir_print.c b/src/compiler/nir/nir_print.c
index bdfbd26..26014c1 100644
--- a/src/compiler/nir/nir_print.c
+++ b/src/compiler/nir/nir_print.c
@@ -207,6 +207,8 @@ print_alu_instr(nir_alu_instr *instr, print_state *state)
print_alu_dest(&instr->dest, state);
fprintf(fp, " = %s", nir_op_infos[instr->op].name);
+ if (instr->exact)
+ fprintf(fp, "!");
if (instr->dest.saturate)
fprintf(fp, ".sat");
fprintf(fp, " ");
--
2.5.0.400.gff86faf
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