From: Iago Toral Quiroga <ito...@igalia.com>
At least i965 hardware does not have native support for fract() on doubles.
---
src/compiler/nir/nir.h | 1 +
src/compiler/nir/nir_lower_double_ops.c | 14 ++++++++++++++
2 files changed, 15 insertions(+)
diff --git a/src/compiler/nir/nir.h b/src/compiler/nir/nir.h
index 7c9e498..4a57e74 100644
--- a/src/compiler/nir/nir.h
+++ b/src/compiler/nir/nir.h
@@ -2289,6 +2289,7 @@ typedef enum {
nir_lower_dtrunc = (1 << 3),
nir_lower_dfloor = (1 << 4),
nir_lower_dceil = (1 << 5),
+ nir_lower_dfract = (1 << 6)
} nir_lower_doubles_options;
void nir_lower_doubles(nir_shader *shader, nir_lower_doubles_options options);
diff --git a/src/compiler/nir/nir_lower_double_ops.c
b/src/compiler/nir/nir_lower_double_ops.c
index 66e2be4..0f42c21 100644
--- a/src/compiler/nir/nir_lower_double_ops.c
+++ b/src/compiler/nir/nir_lower_double_ops.c
@@ -417,6 +417,12 @@ lower_ceil(nir_builder *b, nir_ssa_def *src)
src));
}
+static nir_ssa_def *
+lower_fract(nir_builder *b, nir_ssa_def *src)
+{
+ return nir_fsub(b, src, nir_ffloor(b, src));
+}
+
static void
lower_doubles_instr(nir_alu_instr *instr, nir_lower_doubles_options options)
{
@@ -455,6 +461,11 @@ lower_doubles_instr(nir_alu_instr *instr,
nir_lower_doubles_options options)
return;
break;
+ case nir_op_ffract:
+ if (!(options & nir_lower_dfract))
+ return;
+ break;
+
default:
return;
}
@@ -487,6 +498,9 @@ lower_doubles_instr(nir_alu_instr *instr,
nir_lower_doubles_options options)
case nir_op_fceil:
result = lower_ceil(&bld, src);
break;
+ case nir_op_ffract:
+ result = lower_fract(&bld, src);
+ break;
default:
unreachable("unhandled opcode");
}
--
2.5.0
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