[wasm-simd] Stage SIMD

SIMD has been pretty stable for a while now, we are not expecting big
changes (like opcode renumbers), there might be new instructions added,
and they will all be backwards-compatible.

The reference interpreter in the SIMD proposal is now capable of
generating JS files for all test cases, so we can now run them.

There is a bit of tweaking necessary, since SIMD tests are in
tests/core/simd subfolder in the spec, so we need to change the glob
into a find that will traverse into subdirectory.

Bug: v8:10835
Change-Id: I1f7e3cf37f21b2aa2537d1e34242da2373bbf626
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2378587
Commit-Queue: Zhi An Ng <zhin@chromium.org>
Reviewed-by: Andreas Haas <ahaas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#69793}

src/wasm/wasm-feature-flags.h

@@ -15,11 +15,6 @@
   /* V8 side owner: clemensb */                                                \
   V(eh, "exception handling opcodes", false)                                   \
                                                                                \
-  /* Fixed-width SIMD operations. */                                           \
-  /* https://github.com/webassembly/simd */                                    \
-  /* V8 side owner: gdeepti */                                                 \
-  V(simd, "SIMD opcodes", false)                                               \
-                                                                               \
   /* No official proposal (yet?). */                                           \
   /* V8 side owner: clemensb */                                                \
   V(compilation_hints, "compilation hints section", false)                     \
@@ -56,6 +51,12 @@
   /* Staged in v8.7 * */                                                       \
   V(return_call, "return call opcodes", false)                                 \
                                                                                \
+  /* Fixed-width SIMD operations. */                                           \
+  /* https://github.com/webassembly/simd */                                    \
+  /* V8 side owner: gdeepti, zhin */                                           \
+  /* Staged in v8.7 * */                                                       \
+  V(simd, "SIMD opcodes", false)                                               \
+                                                                               \
   /* Threads proposal. */                                                      \
   /* https://github.com/webassembly/threads */                                 \
   /* NOTE: This is enabled via chromium flag on desktop systems since v7.4  */ \

test/fuzzer/wasm-fuzzer-common.cc

@@ -310,8 +310,6 @@ void WasmExecutionFuzzer::FuzzWasmModule(Vector<const uint8_t> data,
   FlagScope<bool> enable_##feat(&FLAG_experimental_wasm_##feat, true);
   FOREACH_WASM_STAGING_FEATURE_FLAG(ENABLE_STAGED_FEATURES)
 #undef ENABLE_STAGED_FEATURES
-  // SIMD is not included in staging yet, so we enable it here for fuzzing.
-  EXPERIMENTAL_FLAG_SCOPE(simd);
 
   // Strictly enforce the input size limit. Note that setting "max_len" on the
   // fuzzer target is not enough, since different fuzzers are used and not all

test/wasm-js/testcfg.py

@@ -34,6 +34,11 @@ proposal_flags = [{
                     'flags': ['--experimental-wasm-tail-call',
                               '--wasm-staging']
                   },
+                  {
+                    'name': 'simd',
+                    'flags': ['--experimental-wasm-simd',
+                              '--wasm-staging']
+                  },
                   ]
 
 

test/wasm-js/tests.tar.gz.sha1

-e17c5119c343be682a2783156c4a56c2528333a3
+a7c9db6002250f90f4b316649b2915791ff389a8
\ No newline at end of file

test/wasm-spec-tests/testcfg.py

@@ -27,6 +27,11 @@ proposal_flags = [{
                     'flags': ['--experimental-wasm-return-call',
                               '--wasm-staging']
                   },
+                  {
+                    'name': 'simd',
+                    'flags': ['--experimental-wasm-simd',
+                              '--wasm-staging']
+                  },
                   ]
 
 class TestLoader(testsuite.JSTestLoader):

test/wasm-spec-tests/tests.tar.gz.sha1

-10a6b24d01b5124f14658e7a4b8c354138d62386
+d4b9b276a7d0608e3a9bb2d62e6d2b877d05da0c
\ No newline at end of file

test/wasm-spec-tests/wasm-spec-tests.status

@@ -8,6 +8,7 @@
   # TODO(wasm) Investigate failing spec tests after update.
   'binary': [FAIL],
   'proposals/js-types/binary-leb128': [FAIL],
+  'proposals/bulk-memory-operations/binary': [FAIL],
   'proposals/bulk-memory-operations/binary-leb128': [FAIL],
 
   # TODO(v8:9144): The MVP behavior when bounds-checking segments changed in
@@ -35,6 +36,34 @@
 
   # This test requires the reftypes flag to be disabled.
   'proposals/bulk-memory-operations/imports': [FAIL],
+
+  # SIMD test cases
+  # Scalar lowering is incomplete, we skip these and selectively enable as
+  # we finish the implementation, see v8:10507.
+  'proposals/simd/simd_bit_shift' : [PASS, FAIL],
+  'proposals/simd/simd_boolean' : [PASS, FAIL],
+  'proposals/simd/simd_const' : [PASS, FAIL],
+  'proposals/simd/simd_conversions' : [PASS, FAIL],
+  'proposals/simd/simd_f32x4': [PASS, FAIL],
+  'proposals/simd/simd_f32x4_arith': [PASS, FAIL],
+  'proposals/simd/simd_f64x2': [PASS, FAIL],
+  'proposals/simd/simd_f64x2_arith' : [PASS, FAIL],
+  'proposals/simd/simd_f64x2_cmp' : [PASS, FAIL],
+  'proposals/simd/simd_i16x8_arith' : [PASS, FAIL],
+  'proposals/simd/simd_i16x8_arith2' : [PASS, FAIL],
+  'proposals/simd/simd_i16x8_cmp' : [PASS, FAIL],
+  'proposals/simd/simd_i16x8_sat_arith' : [PASS, FAIL],
+  'proposals/simd/simd_i64x2_arith' : [PASS, FAIL],
+  'proposals/simd/simd_i8x16_arith' : [PASS, FAIL],
+  'proposals/simd/simd_i8x16_arith2' : [PASS, FAIL],
+  'proposals/simd/simd_i8x16_cmp' : [PASS, FAIL],
+  'proposals/simd/simd_i8x16_sat_arith' : [PASS, FAIL],
+  'proposals/simd/simd_lane' : [PASS, FAIL],
+  'proposals/simd/simd_load' : [PASS, FAIL],
+  'proposals/simd/simd_load_extend' : [PASS, FAIL],
+  'proposals/simd/simd_load_splat' : [PASS, FAIL],
+  'proposals/simd/simd_splat' : [PASS, FAIL],
+
 }],  # ALWAYS
 
 ['arch == mipsel or arch == mips64el or arch == mips or arch == mips64', {

tools/wasm/update-wasm-spec-tests.sh

@@ -71,7 +71,7 @@ log_and_run cp -r ${TMP_DIR}/spec/test/js-api/* ${JS_API_TEST_DIR}/tests
 # Generate the proposal tests.
 ###############################################################################
 
-repos='bulk-memory-operations reference-types js-types tail-call'
+repos='bulk-memory-operations reference-types js-types tail-call simd'
 
 for repo in ${repos}; do
   echo "Process ${repo}"
@@ -86,9 +86,8 @@ for repo in ${repos}; do
 
   # Iterate over all proposal tests. Those which differ from the spec tests are
   # copied to the output directory and converted to .js tests.
-  for abs_filename in ${TMP_DIR}/${repo}/test/core/*.wast; do
-    rel_filename="$(basename -- $abs_filename)"
-    test_name=${rel_filename%.wast}
+  for rel_filename in $(find . -name '*.wast'); do
+    abs_filename=$(realpath $rel_filename)
     spec_filename=${TMP_DIR}/spec/test/core/${rel_filename}
     if [ ! -f "$spec_filename" ] || ! cmp -s $abs_filename $spec_filename ; then
       log_and_run cp ${rel_filename} ${SPEC_TEST_DIR}/tests/proposals/${repo}/