3 files changed, 8 insertions, 4 deletions
diff --git a/src/gallium/drivers/radeonsi/si_shader.c b/src/gallium/drivers/radeonsi/si_shader.c
index 6734a1628f5..d2b9b73e039 100644
--- a/src/gallium/drivers/radeonsi/si_shader.c
+++ b/src/gallium/drivers/radeonsi/si_shader.c
@@ -233,9 +233,12 @@ unsigned si_shader_io_get_unique_index(unsigned semantic_name, unsigned index,
 			return SI_MAX_IO_GENERIC + 10 + index;
 	case TGSI_SEMANTIC_TEXCOORD:
 		assert(index < 8);
-		STATIC_ASSERT(SI_MAX_IO_GENERIC + 12 + 8 <= 64);
+		STATIC_ASSERT(SI_MAX_IO_GENERIC + 12 + 8 <= 63);
 		return SI_MAX_IO_GENERIC + 12 + index;
+	case TGSI_SEMANTIC_CLIPVERTEX:
+		return 63;
 	default:
+		fprintf(stderr, "invalid semantic name = %u\n", semantic_name);
 		assert(!"invalid semantic name");
 		return 0;
 	}
diff --git a/src/gallium/drivers/radeonsi/si_shader.h b/src/gallium/drivers/radeonsi/si_shader.h
index 555ca598d2c..9e8d5736259 100644
--- a/src/gallium/drivers/radeonsi/si_shader.h
+++ b/src/gallium/drivers/radeonsi/si_shader.h
@@ -152,7 +152,7 @@ struct si_context;
 /* Shader IO unique indices are supported for TGSI_SEMANTIC_GENERIC with an
  * index smaller than this.
  */
-#define SI_MAX_IO_GENERIC       44
+#define SI_MAX_IO_GENERIC       43
 
 /* SGPR user data indices */
 enum {
diff --git a/src/gallium/drivers/radeonsi/si_state_shaders.c b/src/gallium/drivers/radeonsi/si_state_shaders.c
index 1f443667cd6..707bb4187ef 100644
--- a/src/gallium/drivers/radeonsi/si_state_shaders.c
+++ b/src/gallium/drivers/radeonsi/si_state_shaders.c
@@ -1226,9 +1226,10 @@ static void si_shader_selector_key_hw_vs(struct si_context *sctx,
 	uint64_t outputs_written = vs->outputs_written_before_ps;
 	uint64_t inputs_read = 0;
 
-	/* ignore POSITION, PSIZE */
+	/* Ignore outputs that are not passed from VS to PS. */
 	outputs_written &= ~((1ull << si_shader_io_get_unique_index(TGSI_SEMANTIC_POSITION, 0, true)) |
-			     (1ull << si_shader_io_get_unique_index(TGSI_SEMANTIC_PSIZE, 0, true)));
+			     (1ull << si_shader_io_get_unique_index(TGSI_SEMANTIC_PSIZE, 0, true)) |
+			     (1ull << si_shader_io_get_unique_index(TGSI_SEMANTIC_CLIPVERTEX, 0, true)));
 
 	if (!ps_disabled) {
 		inputs_read = ps->inputs_read;