From: Karol Herbst <karolherbst@gmail.com>
Date: Tue, 21 Mar 2017 17:37:47 +0000 (+0100)
Subject: nvc0/ir: also do ConstantFolding for FMA
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=f2a4d881fe94512f7600ec33622af58b8ca06fff;p=mesa.git

nvc0/ir: also do ConstantFolding for FMA

Helps mainly Feral-ported games, due to their use of fma()

shader-db changes:
total instructions in shared programs : 3941587 -> 3940749 (-0.02%)
total gprs used in shared programs    : 481511 -> 481460 (-0.01%)
total local used in shared programs   : 27469 -> 27481 (0.04%)
total bytes used in shared programs   : 36123344 -> 36115776 (-0.02%)

                local        gpr       inst      bytes
    helped           2          48         243         243
      hurt           2           3          32          32

Signed-off-by: Karol Herbst <karolherbst@gmail.com>
Reviewed-by: Ilia Mirkin <imirkin@alum.mit.edu>
---

diff --git a/src/gallium/drivers/nouveau/codegen/nv50_ir_peephole.cpp b/src/gallium/drivers/nouveau/codegen/nv50_ir_peephole.cpp
index d358abc5bd7..2714b5ff7e0 100644
--- a/src/gallium/drivers/nouveau/codegen/nv50_ir_peephole.cpp
+++ b/src/gallium/drivers/nouveau/codegen/nv50_ir_peephole.cpp
@@ -1026,6 +1026,7 @@ ConstantFolding::opnd(Instruction *i, ImmediateValue &imm0, int s)
          i->postFactor = 0;
       }
       break;
+   case OP_FMA:
    case OP_MAD:
       if (imm0.isInteger(0)) {
          i->setSrc(0, i->getSrc(2));