[Mesa-dev] [PATCH 1/2] nir: Add a nop intrinsic

[Jason Ekstrand]

This intrinsic has no destination, no sources, no variables, and can be
eliminated.  In other words, it does nothing and will always get deleted by
dead code elimination.  However, it does provide a quick-and-easy way to
temporarily tag a particular location in a NIR shader.

Signed-off-by: Jason Ekstrand <jason at jlekstrand.net>
---
 src/compiler/nir/nir_intrinsics.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/compiler/nir/nir_intrinsics.h b/src/compiler/nir/nir_intrinsics.h
index b27a148..1d18466 100644
--- a/src/compiler/nir/nir_intrinsics.h
+++ b/src/compiler/nir/nir_intrinsics.h
@@ -41,6 +41,9 @@
 
 #define ARR(...) { __VA_ARGS__ }
 
+INTRINSIC(nop, 0, ARR(0), false, 0, 0, 0, xx, xx, xx,
+          NIR_INTRINSIC_CAN_ELIMINATE | NIR_INTRINSIC_CAN_REORDER)
+
 INTRINSIC(load_var, 0, ARR(0), true, 0, 1, 0, xx, xx, xx, NIR_INTRINSIC_CAN_ELIMINATE)
 INTRINSIC(store_var, 1, ARR(0), false, 0, 1, 1, WRMASK, xx, xx, 0)
 INTRINSIC(copy_var, 0, ARR(0), false, 0, 2, 0, xx, xx, xx, 0)
-- 
2.5.0.400.gff86faf