freedreno/ir3: fix incorrect conversion folding

Fixes dEQP-VK.glsl.builtin.function.pack_unpack.unpackhalf2x16_compute

Signed-off-by: Jonathan Marek <jonathan@marek.ca>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4708>

diff --git a/src/freedreno/ir3/ir3_cf.c b/src/freedreno/ir3/ir3_cf.c
index 9875ba4906f37c540c9cf18ee4033b42fd37c9ee..db9b5de008b7adcf608b482475a256dc075c5ea9 100644 (file)
--- a/src/freedreno/ir3/ir3_cf.c
+++ b/src/freedreno/ir3/ir3_cf.c
@@ -103,6 +103,13 @@ try_conversion_folding(struct ir3_instruction *conv)
        case OPC_SIGN_F:
        case OPC_ABSNEG_F:
                return;
+       case OPC_MOV:
+               /* if src is a "cov" and type doesn't match, then it can't be folded
+                * for example cov.u32u16+cov.f16f32 can't be folded to cov.u32f32
+                */
+               if (src->cat1.dst_type != src->cat1.src_type &&
+                       conv->cat1.src_type != src->cat1.dst_type)
+                       return;
        default:
                break;
        }