spirv: Add support for the CL Round instruction
Add a round() implementation that's conformant with the CL spec.
Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Reviewed-by: Karol Herbst <kherbst@redhat.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6256>
diff --git a/src/compiler/spirv/vtn_opencl.c b/src/compiler/spirv/vtn_opencl.c
index 6018184..a4eb41d 100644
--- a/src/compiler/spirv/vtn_opencl.c
+++ b/src/compiler/spirv/vtn_opencl.c
@@ -282,6 +282,21 @@
}
static nir_ssa_def *
+handle_round(struct vtn_builder *b, enum OpenCLstd_Entrypoints opcode,
+ unsigned num_srcs, nir_ssa_def **srcs,
+ const struct glsl_type *dest_type)
+{
+ nir_ssa_def *src = srcs[0];
+ nir_builder *nb = &b->nb;
+ nir_ssa_def *half = nir_imm_floatN_t(nb, 0.5, src->bit_size);
+ nir_ssa_def *truncated = nir_ftrunc(nb, src);
+ nir_ssa_def *remainder = nir_fsub(nb, src, truncated);
+
+ return nir_bcsel(nb, nir_fge(nb, nir_fabs(nb, remainder), half),
+ nir_fadd(nb, truncated, nir_fsign(nb, src)), truncated);
+}
+
+static nir_ssa_def *
handle_shuffle(struct vtn_builder *b, enum OpenCLstd_Entrypoints opcode, unsigned num_srcs,
nir_ssa_def **srcs, const struct glsl_type *dest_type)
{
@@ -435,6 +450,9 @@
case OpenCLstd_Shuffle2:
handle_instr(b, cl_opcode, w, count, handle_shuffle2);
return true;
+ case OpenCLstd_Round:
+ handle_instr(b, cl_opcode, w, count, handle_round);
+ return true;
case OpenCLstd_Printf:
handle_instr(b, cl_opcode, w, count, handle_printf);
return true;