From c8e6a6452f4e531dca09152178bae2f9a2fb999a Mon Sep 17 00:00:00 2001
From: Yong He <yonghe@outlook.com>
Date: Wed, 10 May 2023 09:11:36 -0700
Subject: Generate faster derivative for div by const operations. (#2877)

* Generate faster derivative for div by const operations.

* Increase `kMaxIterationsToAttempt` to 256.

---------

Co-authored-by: Yong He <yhe@nvidia.com>
---
 source/slang/slang-ir-peephole.cpp | 68 --------------------------------------
 1 file changed, 68 deletions(-)

(limited to 'source/slang/slang-ir-peephole.cpp')

diff --git a/source/slang/slang-ir-peephole.cpp b/source/slang/slang-ir-peephole.cpp
index f04012112..e07d1f9c4 100644
--- a/source/slang/slang-ir-peephole.cpp
+++ b/source/slang/slang-ir-peephole.cpp
@@ -112,74 +112,6 @@ struct PeepholeContext : InstPassBase
         return false;
     }
 
-    bool isZero(IRInst* inst)
-    {
-        switch (inst->getOp())
-        {
-        case kIROp_IntLit:
-            return as<IRIntLit>(inst)->getValue() == 0;
-        case kIROp_FloatLit:
-            return as<IRFloatLit>(inst)->getValue() == 0.0;
-        case kIROp_BoolLit:
-            return as<IRBoolLit>(inst)->getValue() == false;
-        case kIROp_MakeVector:
-        case kIROp_MakeVectorFromScalar:
-        case kIROp_MakeMatrix:
-        case kIROp_MakeMatrixFromScalar:
-        case kIROp_MatrixReshape:
-        case kIROp_VectorReshape:
-        {
-            for (UInt i = 0; i < inst->getOperandCount(); i++)
-            {
-                if (!isZero(inst->getOperand(i)))
-                {
-                    return false;
-                }
-            }
-            return true;
-        }
-        case kIROp_CastIntToFloat:
-        case kIROp_CastFloatToInt:
-            return isZero(inst->getOperand(0));
-        default:
-            return false;
-        }
-    }
-
-    bool isOne(IRInst* inst)
-    {
-        switch (inst->getOp())
-        {
-        case kIROp_IntLit:
-            return as<IRIntLit>(inst)->getValue() == 1;
-        case kIROp_FloatLit:
-            return as<IRFloatLit>(inst)->getValue() == 1.0;
-        case kIROp_BoolLit:
-            return as<IRBoolLit>(inst)->getValue();
-        case kIROp_MakeVector:
-        case kIROp_MakeVectorFromScalar:
-        case kIROp_MakeMatrix:
-        case kIROp_MakeMatrixFromScalar:
-        case kIROp_MatrixReshape:
-        case kIROp_VectorReshape:
-        {
-            for (UInt i = 0; i < inst->getOperandCount(); i++)
-            {
-                if (!isOne(inst->getOperand(i)))
-                {
-                    return false;
-                }
-            }
-            return true;
-        }
-        case kIROp_CastIntToFloat:
-        case kIROp_CastFloatToInt:
-            return isOne(inst->getOperand(0));
-        default:
-            return false;
-        }
-    }
-
     bool tryOptimizeArithmeticInst(IRInst* inst)
     {
         bool allowUnsafeOptimizations =
-- 
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