From b5056be8544345ae4dd53601400240479f99b9a1 Mon Sep 17 00:00:00 2001
From: Yolanda-Chen <yolanda.chen@intel.com>
Date: Sun, 8 Dec 2024 07:24:47 +0800
Subject: [PATCH] v8,tools: expose experimental wasm revectorize feature
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PR-URL: https://github.com/nodejs/node/pull/54896
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
---
 configure.py                    |  3 +++
 tools/v8_gypfiles/features.gypi |  8 +++++++-
 tools/v8_gypfiles/v8.gyp        | 10 ++++++++++
 3 files changed, 20 insertions(+), 1 deletion(-)

diff --git a/configure.py b/configure.py
index e2b12d8823bb64..c361676637c1cb 100755
--- a/configure.py
+++ b/configure.py
@@ -1685,6 +1685,9 @@ def configure_v8(o, configs):
     raise Exception(
         'Only one of the --v8-enable-object-print or --v8-disable-object-print options '
         'can be specified at a time.')
+  if sys.platform != 'darwin':
+    if o['variables']['v8_enable_webassembly'] and o['variables']['target_arch'] == 'x64':
+      o['variables']['v8_enable_wasm_simd256_revec'] = 1
 
 def configure_openssl(o):
   variables = o['variables']
diff --git a/tools/v8_gypfiles/features.gypi b/tools/v8_gypfiles/features.gypi
index 18479d7d2abc44..7940234cd6789c 100644
--- a/tools/v8_gypfiles/features.gypi
+++ b/tools/v8_gypfiles/features.gypi
@@ -328,7 +328,10 @@
 
     # Enable advanced BigInt algorithms, costing about 10-30 KiB binary size
     # depending on platform.
-    'v8_advanced_bigint_algorithms%': 1
+    'v8_advanced_bigint_algorithms%': 1,
+
+    # Enable 256-bit long vector re-vectorization pass in WASM compilation pipeline.
+    'v8_enable_wasm_simd256_revec%' : 0
   },
 
   'target_defaults': {
@@ -541,6 +544,9 @@
       ['v8_advanced_bigint_algorithms==1', {
         'defines': ['V8_ADVANCED_BIGINT_ALGORITHMS',],
       }],
+      ['v8_enable_wasm_simd256_revec==1', {
+        'defines': ['V8_ENABLE_WASM_SIMD256_REVEC',],
+      }],
     ],  # conditions
     'defines': [
       'V8_GYP_BUILD',
diff --git a/tools/v8_gypfiles/v8.gyp b/tools/v8_gypfiles/v8.gyp
index f344406a9414e9..9b5d8e2f648467 100644
--- a/tools/v8_gypfiles/v8.gyp
+++ b/tools/v8_gypfiles/v8.gyp
@@ -646,6 +646,11 @@
               '<!@pymod_do_main(GN-scraper "<(V8_ROOT)/BUILD.gn"  "v8_header_set.\\"v8_internal_headers\\".*?v8_enable_webassembly.*?sources \\+= ")',
             ],
           }],
+          ['v8_enable_wasm_simd256_revec==1', {
+            'sources': [
+              '<!@pymod_do_main(GN-scraper "<(V8_ROOT)/BUILD.gn"  "v8_header_set.\\"v8_internal_headers\\".*?v8_enable_wasm_simd256_revec.*?sources \\+= ")',
+            ],
+          }],
           ['v8_enable_i18n_support==1', {
             'sources': [
               '<!@pymod_do_main(GN-scraper "<(V8_ROOT)/BUILD.gn"  "v8_header_set.\\"v8_internal_headers\\".*?v8_enable_i18n_support.*?sources \\+= ")',
@@ -882,6 +887,11 @@
               '<!@pymod_do_main(GN-scraper "<(V8_ROOT)/BUILD.gn"  "v8_compiler_sources =.*?v8_enable_webassembly.*?v8_compiler_sources \\+= ")',
             ],
           }],
+          ['v8_enable_wasm_simd256_revec==1', {
+            'sources': [
+              '<!@pymod_do_main(GN-scraper "<(V8_ROOT)/BUILD.gn"  "v8_compiler_sources =.*?v8_enable_wasm_simd256_revec.*?v8_compiler_sources \\+= ")',
+            ],
+          }],
         ],
       }
     },  # v8_compiler_sources