Mesa (main): nir: Add new opcode for ternary addition

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Module: Mesa
Branch: main
Commit: e8dff256c07fac1484b66c7f7a71f1b9c5ffe1dd
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=e8dff256c07fac1484b66c7f7a71f1b9c5ffe1dd

Author: Sagar Ghuge <sagar.ghuge at intel.com>
Date:   Fri Jun  5 22:52:33 2020 -0700

nir: Add new opcode for ternary addition

v2:
- Make it 2src commutative (Connor Abbott)

Signed-off-by: Sagar Ghuge <sagar.ghuge at intel.com>
Reviewed-by: Alyssa Rosenzweig <alyssa at collabora.com>
Reviewed-by: Jason Ekstrand <jason at jlekstrand.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/11596>

---

 src/compiler/nir/nir_opcodes.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/compiler/nir/nir_opcodes.py b/src/compiler/nir/nir_opcodes.py
index 832b6215222..b114e51584d 100644
--- a/src/compiler/nir/nir_opcodes.py
+++ b/src/compiler/nir/nir_opcodes.py
@@ -957,6 +957,9 @@ if (nir_is_rounding_mode_rtz(execution_mode, bit_size)) {
 
 triop("flrp", tfloat, "", "src0 * (1 - src2) + src1 * src2")
 
+# Ternary addition
+triop("iadd3", tint, _2src_commutative + associative, "src0 + src1 + src2")
+
 # Conditional Select
 #
 # A vector conditional select instruction (like ?:, but operating per-