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diff --git a/js/src/jit-test/tests/wasm/spec/memory64/memory64.wast.js b/js/src/jit-test/tests/wasm/spec/memory64/memory64.wast.js
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+++ b/js/src/jit-test/tests/wasm/spec/memory64/memory64.wast.js
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+/* Copyright 2021 Mozilla Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+// ./test/core/memory64.wast
+
+// ./test/core/memory64.wast:3
+let $0 = instantiate(`(module (memory i64 0 0))`);
+
+// ./test/core/memory64.wast:4
+let $1 = instantiate(`(module (memory i64 0 1))`);
+
+// ./test/core/memory64.wast:5
+let $2 = instantiate(`(module (memory i64 1 256))`);
+
+// ./test/core/memory64.wast:6
+let $3 = instantiate(`(module (memory i64 0 65536))`);
+
+// ./test/core/memory64.wast:8
+assert_invalid(
+ () => instantiate(`(module (memory i64 0) (memory i64 0))`),
+ `multiple memories`,
+);
+
+// ./test/core/memory64.wast:9
+assert_invalid(
+ () => instantiate(`(module (memory (import "spectest" "memory") i64 0) (memory i64 0))`),
+ `multiple memories`,
+);
+
+// ./test/core/memory64.wast:11
+let $4 = instantiate(`(module (memory i64 (data)) (func (export "memsize") (result i64) (memory.size)))`);
+
+// ./test/core/memory64.wast:12
+assert_return(() => invoke($4, `memsize`, []), [value("i64", 0n)]);
+
+// ./test/core/memory64.wast:13
+let $5 = instantiate(`(module (memory i64 (data "")) (func (export "memsize") (result i64) (memory.size)))`);
+
+// ./test/core/memory64.wast:14
+assert_return(() => invoke($5, `memsize`, []), [value("i64", 0n)]);
+
+// ./test/core/memory64.wast:15
+let $6 = instantiate(`(module (memory i64 (data "x")) (func (export "memsize") (result i64) (memory.size)))`);
+
+// ./test/core/memory64.wast:16
+assert_return(() => invoke($6, `memsize`, []), [value("i64", 1n)]);
+
+// ./test/core/memory64.wast:18
+assert_invalid(() => instantiate(`(module (data (i64.const 0)))`), `unknown memory`);
+
+// ./test/core/memory64.wast:19
+assert_invalid(() => instantiate(`(module (data (i64.const 0) ""))`), `unknown memory`);
+
+// ./test/core/memory64.wast:20
+assert_invalid(() => instantiate(`(module (data (i64.const 0) "x"))`), `unknown memory`);
+
+// ./test/core/memory64.wast:22
+assert_invalid(
+ () => instantiate(`(module (func (drop (f32.load (i64.const 0)))))`),
+ `unknown memory`,
+);
+
+// ./test/core/memory64.wast:26
+assert_invalid(
+ () => instantiate(`(module (func (f32.store (i64.const 0) (f32.const 0))))`),
+ `unknown memory`,
+);
+
+// ./test/core/memory64.wast:30
+assert_invalid(
+ () => instantiate(`(module (func (drop (i32.load8_s (i64.const 0)))))`),
+ `unknown memory`,
+);
+
+// ./test/core/memory64.wast:34
+assert_invalid(
+ () => instantiate(`(module (func (i32.store8 (i64.const 0) (i32.const 0))))`),
+ `unknown memory`,
+);
+
+// ./test/core/memory64.wast:38
+assert_invalid(
+ () => instantiate(`(module (func (drop (memory.size))))`),
+ `unknown memory`,
+);
+
+// ./test/core/memory64.wast:42
+assert_invalid(
+ () => instantiate(`(module (func (drop (memory.grow (i64.const 0)))))`),
+ `unknown memory`,
+);
+
+// ./test/core/memory64.wast:48
+assert_invalid(
+ () => instantiate(`(module (memory i64 1 0))`),
+ `size minimum must not be greater than maximum`,
+);
+
+// ./test/core/memory64.wast:53
+let $7 = instantiate(`(module
+ (memory i64 1)
+ (data (i64.const 0) "ABC\\a7D") (data (i64.const 20) "WASM")
+
+ ;; Data section
+ (func (export "data") (result i32)
+ (i32.and
+ (i32.and
+ (i32.and
+ (i32.eq (i32.load8_u (i64.const 0)) (i32.const 65))
+ (i32.eq (i32.load8_u (i64.const 3)) (i32.const 167))
+ )
+ (i32.and
+ (i32.eq (i32.load8_u (i64.const 6)) (i32.const 0))
+ (i32.eq (i32.load8_u (i64.const 19)) (i32.const 0))
+ )
+ )
+ (i32.and
+ (i32.and
+ (i32.eq (i32.load8_u (i64.const 20)) (i32.const 87))
+ (i32.eq (i32.load8_u (i64.const 23)) (i32.const 77))
+ )
+ (i32.and
+ (i32.eq (i32.load8_u (i64.const 24)) (i32.const 0))
+ (i32.eq (i32.load8_u (i64.const 1023)) (i32.const 0))
+ )
+ )
+ )
+ )
+
+ ;; Memory cast
+ (func (export "cast") (result f64)
+ (i64.store (i64.const 8) (i64.const -12345))
+ (if
+ (f64.eq
+ (f64.load (i64.const 8))
+ (f64.reinterpret_i64 (i64.const -12345))
+ )
+ (then (return (f64.const 0)))
+ )
+ (i64.store align=1 (i64.const 9) (i64.const 0))
+ (i32.store16 align=1 (i64.const 15) (i32.const 16453))
+ (f64.load align=1 (i64.const 9))
+ )
+
+ ;; Sign and zero extending memory loads
+ (func (export "i32_load8_s") (param $$i i32) (result i32)
+ (i32.store8 (i64.const 8) (local.get $$i))
+ (i32.load8_s (i64.const 8))
+ )
+ (func (export "i32_load8_u") (param $$i i32) (result i32)
+ (i32.store8 (i64.const 8) (local.get $$i))
+ (i32.load8_u (i64.const 8))
+ )
+ (func (export "i32_load16_s") (param $$i i32) (result i32)
+ (i32.store16 (i64.const 8) (local.get $$i))
+ (i32.load16_s (i64.const 8))
+ )
+ (func (export "i32_load16_u") (param $$i i32) (result i32)
+ (i32.store16 (i64.const 8) (local.get $$i))
+ (i32.load16_u (i64.const 8))
+ )
+ (func (export "i64_load8_s") (param $$i i64) (result i64)
+ (i64.store8 (i64.const 8) (local.get $$i))
+ (i64.load8_s (i64.const 8))
+ )
+ (func (export "i64_load8_u") (param $$i i64) (result i64)
+ (i64.store8 (i64.const 8) (local.get $$i))
+ (i64.load8_u (i64.const 8))
+ )
+ (func (export "i64_load16_s") (param $$i i64) (result i64)
+ (i64.store16 (i64.const 8) (local.get $$i))
+ (i64.load16_s (i64.const 8))
+ )
+ (func (export "i64_load16_u") (param $$i i64) (result i64)
+ (i64.store16 (i64.const 8) (local.get $$i))
+ (i64.load16_u (i64.const 8))
+ )
+ (func (export "i64_load32_s") (param $$i i64) (result i64)
+ (i64.store32 (i64.const 8) (local.get $$i))
+ (i64.load32_s (i64.const 8))
+ )
+ (func (export "i64_load32_u") (param $$i i64) (result i64)
+ (i64.store32 (i64.const 8) (local.get $$i))
+ (i64.load32_u (i64.const 8))
+ )
+)`);
+
+// ./test/core/memory64.wast:141
+assert_return(() => invoke($7, `data`, []), [value("i32", 1)]);
+
+// ./test/core/memory64.wast:142
+assert_return(() => invoke($7, `cast`, []), [value("f64", 42)]);
+
+// ./test/core/memory64.wast:144
+assert_return(() => invoke($7, `i32_load8_s`, [-1]), [value("i32", -1)]);
+
+// ./test/core/memory64.wast:145
+assert_return(() => invoke($7, `i32_load8_u`, [-1]), [value("i32", 255)]);
+
+// ./test/core/memory64.wast:146
+assert_return(() => invoke($7, `i32_load16_s`, [-1]), [value("i32", -1)]);
+
+// ./test/core/memory64.wast:147
+assert_return(() => invoke($7, `i32_load16_u`, [-1]), [value("i32", 65535)]);
+
+// ./test/core/memory64.wast:149
+assert_return(() => invoke($7, `i32_load8_s`, [100]), [value("i32", 100)]);
+
+// ./test/core/memory64.wast:150
+assert_return(() => invoke($7, `i32_load8_u`, [200]), [value("i32", 200)]);
+
+// ./test/core/memory64.wast:151
+assert_return(() => invoke($7, `i32_load16_s`, [20000]), [value("i32", 20000)]);
+
+// ./test/core/memory64.wast:152
+assert_return(() => invoke($7, `i32_load16_u`, [40000]), [value("i32", 40000)]);
+
+// ./test/core/memory64.wast:154
+assert_return(() => invoke($7, `i32_load8_s`, [-19110589]), [value("i32", 67)]);
+
+// ./test/core/memory64.wast:155
+assert_return(() => invoke($7, `i32_load8_s`, [878104047]), [value("i32", -17)]);
+
+// ./test/core/memory64.wast:156
+assert_return(() => invoke($7, `i32_load8_u`, [-19110589]), [value("i32", 67)]);
+
+// ./test/core/memory64.wast:157
+assert_return(() => invoke($7, `i32_load8_u`, [878104047]), [value("i32", 239)]);
+
+// ./test/core/memory64.wast:158
+assert_return(() => invoke($7, `i32_load16_s`, [-19110589]), [value("i32", 25923)]);
+
+// ./test/core/memory64.wast:159
+assert_return(() => invoke($7, `i32_load16_s`, [878104047]), [value("i32", -12817)]);
+
+// ./test/core/memory64.wast:160
+assert_return(() => invoke($7, `i32_load16_u`, [-19110589]), [value("i32", 25923)]);
+
+// ./test/core/memory64.wast:161
+assert_return(() => invoke($7, `i32_load16_u`, [878104047]), [value("i32", 52719)]);
+
+// ./test/core/memory64.wast:163
+assert_return(() => invoke($7, `i64_load8_s`, [-1n]), [value("i64", -1n)]);
+
+// ./test/core/memory64.wast:164
+assert_return(() => invoke($7, `i64_load8_u`, [-1n]), [value("i64", 255n)]);
+
+// ./test/core/memory64.wast:165
+assert_return(() => invoke($7, `i64_load16_s`, [-1n]), [value("i64", -1n)]);
+
+// ./test/core/memory64.wast:166
+assert_return(() => invoke($7, `i64_load16_u`, [-1n]), [value("i64", 65535n)]);
+
+// ./test/core/memory64.wast:167
+assert_return(() => invoke($7, `i64_load32_s`, [-1n]), [value("i64", -1n)]);
+
+// ./test/core/memory64.wast:168
+assert_return(() => invoke($7, `i64_load32_u`, [-1n]), [value("i64", 4294967295n)]);
+
+// ./test/core/memory64.wast:170
+assert_return(() => invoke($7, `i64_load8_s`, [100n]), [value("i64", 100n)]);
+
+// ./test/core/memory64.wast:171
+assert_return(() => invoke($7, `i64_load8_u`, [200n]), [value("i64", 200n)]);
+
+// ./test/core/memory64.wast:172
+assert_return(() => invoke($7, `i64_load16_s`, [20000n]), [value("i64", 20000n)]);
+
+// ./test/core/memory64.wast:173
+assert_return(() => invoke($7, `i64_load16_u`, [40000n]), [value("i64", 40000n)]);
+
+// ./test/core/memory64.wast:174
+assert_return(() => invoke($7, `i64_load32_s`, [20000n]), [value("i64", 20000n)]);
+
+// ./test/core/memory64.wast:175
+assert_return(() => invoke($7, `i64_load32_u`, [40000n]), [value("i64", 40000n)]);
+
+// ./test/core/memory64.wast:177
+assert_return(() => invoke($7, `i64_load8_s`, [-81985529755441853n]), [value("i64", 67n)]);
+
+// ./test/core/memory64.wast:178
+assert_return(() => invoke($7, `i64_load8_s`, [3771275841602506223n]), [value("i64", -17n)]);
+
+// ./test/core/memory64.wast:179
+assert_return(() => invoke($7, `i64_load8_u`, [-81985529755441853n]), [value("i64", 67n)]);
+
+// ./test/core/memory64.wast:180
+assert_return(() => invoke($7, `i64_load8_u`, [3771275841602506223n]), [value("i64", 239n)]);
+
+// ./test/core/memory64.wast:181
+assert_return(() => invoke($7, `i64_load16_s`, [-81985529755441853n]), [value("i64", 25923n)]);
+
+// ./test/core/memory64.wast:182
+assert_return(() => invoke($7, `i64_load16_s`, [3771275841602506223n]), [value("i64", -12817n)]);
+
+// ./test/core/memory64.wast:183
+assert_return(() => invoke($7, `i64_load16_u`, [-81985529755441853n]), [value("i64", 25923n)]);
+
+// ./test/core/memory64.wast:184
+assert_return(() => invoke($7, `i64_load16_u`, [3771275841602506223n]), [value("i64", 52719n)]);
+
+// ./test/core/memory64.wast:185
+assert_return(() => invoke($7, `i64_load32_s`, [-81985529755441853n]), [value("i64", 1446274371n)]);
+
+// ./test/core/memory64.wast:186
+assert_return(() => invoke($7, `i64_load32_s`, [3771275841602506223n]), [value("i64", -1732588049n)]);
+
+// ./test/core/memory64.wast:187
+assert_return(() => invoke($7, `i64_load32_u`, [-81985529755441853n]), [value("i64", 1446274371n)]);
+
+// ./test/core/memory64.wast:188
+assert_return(() => invoke($7, `i64_load32_u`, [3771275841602506223n]), [value("i64", 2562379247n)]);