This allows us to generate the MAC (multiply-accumulate) instruction,
which can be used to implement some expressions in fewer instructions
than doing a series of MUL and ADDs.
Signed-off-by: Juha-Pekka Heikkila <juhapekka.heikk...@gmail.com>
---
src/mesa/drivers/dri/i965/brw_fs.cpp | 1 +
src/mesa/drivers/dri/i965/brw_fs_generator.cpp | 3 +++
2 files changed, 4 insertions(+)
diff --git a/src/mesa/drivers/dri/i965/brw_fs.cpp
b/src/mesa/drivers/dri/i965/brw_fs.cpp
index 107d9e6..9837ab4 100644
--- a/src/mesa/drivers/dri/i965/brw_fs.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs.cpp
@@ -196,6 +196,7 @@ ALU3(MAD)
ALU2_ACC(ADDC)
ALU2_ACC(SUBB)
ALU2(SEL)
+ALU2(MAC)
/** Gen4 predicated IF. */
fs_inst *
diff --git a/src/mesa/drivers/dri/i965/brw_fs_generator.cpp
b/src/mesa/drivers/dri/i965/brw_fs_generator.cpp
index 1cf35b4..c6b4aae 100644
--- a/src/mesa/drivers/dri/i965/brw_fs_generator.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs_generator.cpp
@@ -1545,6 +1545,9 @@ fs_generator::generate_code(exec_list *instructions, FILE
*dump_file)
assert(brw->gen >= 7);
brw_SUBB(p, dst, src[0], src[1]);
break;
+ case BRW_OPCODE_MAC:
+ brw_MAC(p, dst, src[0], src[1]);
+ break;
case BRW_OPCODE_BFE:
assert(brw->gen >= 7);
--
1.8.1.2
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