From 5b13a5c59dd03b013038b51c6716d1b721ad20e9 Mon Sep 17 00:00:00 2001
From: Aleksei Nikiforov
 <103434461+AlekseiNikiforovIBM@users.noreply.github.com>
Date: Thu, 21 Nov 2024 22:45:46 +0100
Subject: [PATCH] Add option to force generic algorithms on x86 (#22917)

Option is named onnxruntime_FORCE_GENERIC_ALGORITHMS

Follow up to https://github.com/microsoft/onnxruntime/pull/22125.

### Description
This change adds compile-time option to disable optimized algorithms and
use generic algorithms (exclude AVX* and SSE etc in GEMM) on x86. This
new option is intended only for testing these algorithms, not for
production use.

Following build command on linux x86_64 builds onnxruntime with new
option enabled:
`./build.sh --parallel --cmake_extra_defines
onnxruntime_FORCE_GENERIC_ALGORITHMS=1`

### Motivation and Context
This change allows testing generic algorithms. This may be needed for
platforms which don't have optimized implementations available, like in
https://github.com/microsoft/onnxruntime/pull/22125.
---
 onnxruntime/core/mlas/lib/qgemm.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/onnxruntime/core/mlas/lib/qgemm.h b/onnxruntime/core/mlas/lib/qgemm.h
index 3deaad05e2cd6..bcd878efa681b 100644
--- a/onnxruntime/core/mlas/lib/qgemm.h
+++ b/onnxruntime/core/mlas/lib/qgemm.h
@@ -867,6 +867,7 @@ MlasGemmQuantGetDispatch(
 {
     const MLAS_GEMM_QUANT_DISPATCH* GemmQuantDispatch = &MlasGemmQuantDispatchDefault;
 
+#if !defined(FORCE_GENERIC_ALGORITHMS)
 #if defined(MLAS_TARGET_AMD64_IX86)
     if (AIsSigned) {
         GemmQuantDispatch =