agx: Use unconditional else instruction

Rather than duplicating the condition. This matches the blob, so is presumably
the most energy-efficient way of expressing the logic.

No shader-db changes.

Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/24635>

diff --git a/src/asahi/compiler/agx_compile.c b/src/asahi/compiler/agx_compile.c
index f524060..cb049a2 100644 (file)
--- a/src/asahi/compiler/agx_compile.c
+++ b/src/asahi/compiler/agx_compile.c
@@ -1878,8 +1878,11 @@ emit_if(agx_context *ctx, nir_if *nif)
    agx_block *else_block = emit_cf_list(ctx, &nif->else_list);
    agx_block *end_else = ctx->current_block;
 
+   /* Insert an else instruction at the beginning of the else block. We use
+    * "else_fcmp 0.0, 0.0, eq" as unconditional else, matching the blob.
+    */
    _b.cursor = agx_before_block(else_block);
-   agx_else_icmp(&_b, cond, agx_zero(), 1, AGX_ICOND_UEQ, false);
+   agx_else_fcmp(&_b, agx_zero(), agx_zero(), 1, AGX_FCOND_EQ, false);
 
    ctx->after_block = agx_create_block(ctx);