diff --git a/packages/helper-wasm-bytecode/src/index.js b/packages/helper-wasm-bytecode/src/index.js
index 76536f6ec..6d91ee69a 100644
--- a/packages/helper-wasm-bytecode/src/index.js
+++ b/packages/helper-wasm-bytecode/src/index.js
@@ -348,6 +348,17 @@ const symbolsByByte = {
   0xfc_10: createSymbol("table.size", 1),
   0xfc_11: createSymbol("table.fill", 1),
 
+  // https://webassembly.github.io/spec/core/binary/instructions.html#numeric-instructions
+  // saturating truncation instructions
+  0xfc_00: createSymbol("i32.trunc_sat_f32_s"),
+  0xfc_01: createSymbol("i32.trunc_sat_f32_u"),
+  0xfc_02: createSymbol("i32.trunc_sat_f64_s"),
+  0xfc_03: createSymbol("i32.trunc_sat_f64_u"),
+  0xfc_04: createSymbol("i64.trunc_sat_f32_s"),
+  0xfc_05: createSymbol("i64.trunc_sat_f32_u"),
+  0xfc_06: createSymbol("i64.trunc_sat_f64_s"),
+  0xfc_07: createSymbol("i64.trunc_sat_f64_u"),
+
   // Atomic Memory Instructions
   0xfe00: createSymbol("memory.atomic.notify", 1),
   0xfe01: createSymbol("memory.atomic.wait32", 1),
diff --git a/packages/wasm-parser/test/fixtures/conversions/actual.wasm b/packages/wasm-parser/test/fixtures/conversions/actual.wasm
new file mode 100644
index 000000000..dd697c3ba
Binary files /dev/null and b/packages/wasm-parser/test/fixtures/conversions/actual.wasm differ
diff --git a/packages/wasm-parser/test/fixtures/conversions/expected b/packages/wasm-parser/test/fixtures/conversions/expected
new file mode 100644
index 000000000..4d15c7412
--- /dev/null
+++ b/packages/wasm-parser/test/fixtures/conversions/expected
@@ -0,0 +1,487 @@
+0x0:	 0x0 0x61 0x73 0x6d 										 ; wasm magic header
+0x4:	 0x1 0x0 0x0 0x0 										 ; wasm version
+; section Type
+0xa:	 0x1 										 ; section code
+0xa:	 0x3d 										 ; section size
+0xb:	 0xc 										 ; num types
+; type 0
+0xc:	 0x60 										 ; func
+0xd:	 0x1 										 ; number
+0xe:	 0x7f 										 ; i32
+0xf:	 0x1 										 ; number
+0x10:	 0x7e 										 ; i64
+; type 1
+0x11:	 0x60 										 ; func
+0x12:	 0x1 										 ; number
+0x13:	 0x7e 										 ; i64
+0x14:	 0x1 										 ; number
+0x15:	 0x7f 										 ; i32
+; type 2
+0x16:	 0x60 										 ; func
+0x17:	 0x1 										 ; number
+0x18:	 0x7d 										 ; f32
+0x19:	 0x1 										 ; number
+0x1a:	 0x7f 										 ; i32
+; type 3
+0x1b:	 0x60 										 ; func
+0x1c:	 0x1 										 ; number
+0x1d:	 0x7c 										 ; f64
+0x1e:	 0x1 										 ; number
+0x1f:	 0x7f 										 ; i32
+; type 4
+0x20:	 0x60 										 ; func
+0x21:	 0x1 										 ; number
+0x22:	 0x7d 										 ; f32
+0x23:	 0x1 										 ; number
+0x24:	 0x7e 										 ; i64
+; type 5
+0x25:	 0x60 										 ; func
+0x26:	 0x1 										 ; number
+0x27:	 0x7c 										 ; f64
+0x28:	 0x1 										 ; number
+0x29:	 0x7e 										 ; i64
+; type 6
+0x2a:	 0x60 										 ; func
+0x2b:	 0x1 										 ; number
+0x2c:	 0x7f 										 ; i32
+0x2d:	 0x1 										 ; number
+0x2e:	 0x7d 										 ; f32
+; type 7
+0x2f:	 0x60 										 ; func
+0x30:	 0x1 										 ; number
+0x31:	 0x7e 										 ; i64
+0x32:	 0x1 										 ; number
+0x33:	 0x7d 										 ; f32
+; type 8
+0x34:	 0x60 										 ; func
+0x35:	 0x1 										 ; number
+0x36:	 0x7f 										 ; i32
+0x37:	 0x1 										 ; number
+0x38:	 0x7c 										 ; f64
+; type 9
+0x39:	 0x60 										 ; func
+0x3a:	 0x1 										 ; number
+0x3b:	 0x7e 										 ; i64
+0x3c:	 0x1 										 ; number
+0x3d:	 0x7c 										 ; f64
+; type 10
+0x3e:	 0x60 										 ; func
+0x3f:	 0x1 										 ; number
+0x40:	 0x7d 										 ; f32
+0x41:	 0x1 										 ; number
+0x42:	 0x7c 										 ; f64
+; type 11
+0x43:	 0x60 										 ; func
+0x44:	 0x1 										 ; number
+0x45:	 0x7c 										 ; f64
+0x46:	 0x1 										 ; number
+0x47:	 0x7d 										 ; f32
+; section Function
+0x49:	 0x3 										 ; section code
+0x49:	 0x22 										 ; section size
+0x4a:	 0x21 										 ; num funcs
+0x4b:	 0x0 										 ; type index
+0x4c:	 0x0 										 ; type index
+0x4d:	 0x1 										 ; type index
+0x4e:	 0x2 										 ; type index
+0x4f:	 0x2 										 ; type index
+0x50:	 0x3 										 ; type index
+0x51:	 0x3 										 ; type index
+0x52:	 0x4 										 ; type index
+0x53:	 0x4 										 ; type index
+0x54:	 0x5 										 ; type index
+0x55:	 0x5 										 ; type index
+0x56:	 0x2 										 ; type index
+0x57:	 0x2 										 ; type index
+0x58:	 0x3 										 ; type index
+0x59:	 0x3 										 ; type index
+0x5a:	 0x4 										 ; type index
+0x5b:	 0x4 										 ; type index
+0x5c:	 0x5 										 ; type index
+0x5d:	 0x5 										 ; type index
+0x5e:	 0x6 										 ; type index
+0x5f:	 0x7 										 ; type index
+0x60:	 0x8 										 ; type index
+0x61:	 0x9 										 ; type index
+0x62:	 0x6 										 ; type index
+0x63:	 0x7 										 ; type index
+0x64:	 0x8 										 ; type index
+0x65:	 0x9 										 ; type index
+0x66:	 0xa 										 ; type index
+0x67:	 0xb 										 ; type index
+0x68:	 0x6 										 ; type index
+0x69:	 0x9 										 ; type index
+0x6a:	 0x2 										 ; type index
+0x6b:	 0x5 										 ; type index
+; section Export
+0x6e:	 0x7 										 ; section code
+0x6e:	 0x291 										 ; section size
+0x6f:	 0x21 										 ; num exports
+0x6f:	 0x10 										 ; string length
+0x80:	  										 ; export name (i64.extend_i32_s)
+0x81:	 0x0 										 ; export kind
+0x82:	 0x0 										 ; export index
+0x82:	 0x10 										 ; string length
+0x93:	  										 ; export name (i64.extend_i32_u)
+0x94:	 0x0 										 ; export kind
+0x95:	 0x1 										 ; export index
+0x95:	 0xc 										 ; string length
+0xa2:	  										 ; export name (i32.wrap_i64)
+0xa3:	 0x0 										 ; export kind
+0xa4:	 0x2 										 ; export index
+0xa4:	 0xf 										 ; string length
+0xb4:	  										 ; export name (i32.trunc_f32_s)
+0xb5:	 0x0 										 ; export kind
+0xb6:	 0x3 										 ; export index
+0xb6:	 0xf 										 ; string length
+0xc6:	  										 ; export name (i32.trunc_f32_u)
+0xc7:	 0x0 										 ; export kind
+0xc8:	 0x4 										 ; export index
+0xc8:	 0xf 										 ; string length
+0xd8:	  										 ; export name (i32.trunc_f64_s)
+0xd9:	 0x0 										 ; export kind
+0xda:	 0x5 										 ; export index
+0xda:	 0xf 										 ; string length
+0xea:	  										 ; export name (i32.trunc_f64_u)
+0xeb:	 0x0 										 ; export kind
+0xec:	 0x6 										 ; export index
+0xec:	 0xf 										 ; string length
+0xfc:	  										 ; export name (i64.trunc_f32_s)
+0xfd:	 0x0 										 ; export kind
+0xfe:	 0x7 										 ; export index
+0xfe:	 0xf 										 ; string length
+0x10e:	  										 ; export name (i64.trunc_f32_u)
+0x10f:	 0x0 										 ; export kind
+0x110:	 0x8 										 ; export index
+0x110:	 0xf 										 ; string length
+0x120:	  										 ; export name (i64.trunc_f64_s)
+0x121:	 0x0 										 ; export kind
+0x122:	 0x9 										 ; export index
+0x122:	 0xf 										 ; string length
+0x132:	  										 ; export name (i64.trunc_f64_u)
+0x133:	 0x0 										 ; export kind
+0x134:	 0xa 										 ; export index
+0x134:	 0x13 										 ; string length
+0x148:	  										 ; export name (i32.trunc_sat_f32_s)
+0x149:	 0x0 										 ; export kind
+0x14a:	 0xb 										 ; export index
+0x14a:	 0x13 										 ; string length
+0x15e:	  										 ; export name (i32.trunc_sat_f32_u)
+0x15f:	 0x0 										 ; export kind
+0x160:	 0xc 										 ; export index
+0x160:	 0x13 										 ; string length
+0x174:	  										 ; export name (i32.trunc_sat_f64_s)
+0x175:	 0x0 										 ; export kind
+0x176:	 0xd 										 ; export index
+0x176:	 0x13 										 ; string length
+0x18a:	  										 ; export name (i32.trunc_sat_f64_u)
+0x18b:	 0x0 										 ; export kind
+0x18c:	 0xe 										 ; export index
+0x18c:	 0x13 										 ; string length
+0x1a0:	  										 ; export name (i64.trunc_sat_f32_s)
+0x1a1:	 0x0 										 ; export kind
+0x1a2:	 0xf 										 ; export index
+0x1a2:	 0x13 										 ; string length
+0x1b6:	  										 ; export name (i64.trunc_sat_f32_u)
+0x1b7:	 0x0 										 ; export kind
+0x1b8:	 0x10 										 ; export index
+0x1b8:	 0x13 										 ; string length
+0x1cc:	  										 ; export name (i64.trunc_sat_f64_s)
+0x1cd:	 0x0 										 ; export kind
+0x1ce:	 0x11 										 ; export index
+0x1ce:	 0x13 										 ; string length
+0x1e2:	  										 ; export name (i64.trunc_sat_f64_u)
+0x1e3:	 0x0 										 ; export kind
+0x1e4:	 0x12 										 ; export index
+0x1e4:	 0x11 										 ; string length
+0x1f6:	  										 ; export name (f32.convert_i32_s)
+0x1f7:	 0x0 										 ; export kind
+0x1f8:	 0x13 										 ; export index
+0x1f8:	 0x11 										 ; string length
+0x20a:	  										 ; export name (f32.convert_i64_s)
+0x20b:	 0x0 										 ; export kind
+0x20c:	 0x14 										 ; export index
+0x20c:	 0x11 										 ; string length
+0x21e:	  										 ; export name (f64.convert_i32_s)
+0x21f:	 0x0 										 ; export kind
+0x220:	 0x15 										 ; export index
+0x220:	 0x11 										 ; string length
+0x232:	  										 ; export name (f64.convert_i64_s)
+0x233:	 0x0 										 ; export kind
+0x234:	 0x16 										 ; export index
+0x234:	 0x11 										 ; string length
+0x246:	  										 ; export name (f32.convert_i32_u)
+0x247:	 0x0 										 ; export kind
+0x248:	 0x17 										 ; export index
+0x248:	 0x11 										 ; string length
+0x25a:	  										 ; export name (f32.convert_i64_u)
+0x25b:	 0x0 										 ; export kind
+0x25c:	 0x18 										 ; export index
+0x25c:	 0x11 										 ; string length
+0x26e:	  										 ; export name (f64.convert_i32_u)
+0x26f:	 0x0 										 ; export kind
+0x270:	 0x19 										 ; export index
+0x270:	 0x11 										 ; string length
+0x282:	  										 ; export name (f64.convert_i64_u)
+0x283:	 0x0 										 ; export kind
+0x284:	 0x1a 										 ; export index
+0x284:	 0xf 										 ; string length
+0x294:	  										 ; export name (f64.promote_f32)
+0x295:	 0x0 										 ; export kind
+0x296:	 0x1b 										 ; export index
+0x296:	 0xe 										 ; string length
+0x2a5:	  										 ; export name (f32.demote_f64)
+0x2a6:	 0x0 										 ; export kind
+0x2a7:	 0x1c 										 ; export index
+0x2a7:	 0x13 										 ; string length
+0x2bb:	  										 ; export name (f32.reinterpret_i32)
+0x2bc:	 0x0 										 ; export kind
+0x2bd:	 0x1d 										 ; export index
+0x2bd:	 0x13 										 ; string length
+0x2d1:	  										 ; export name (f64.reinterpret_i64)
+0x2d2:	 0x0 										 ; export kind
+0x2d3:	 0x1e 										 ; export index
+0x2d3:	 0x13 										 ; string length
+0x2e7:	  										 ; export name (i32.reinterpret_f32)
+0x2e8:	 0x0 										 ; export kind
+0x2e9:	 0x1f 										 ; export index
+0x2e9:	 0x13 										 ; string length
+0x2fd:	  										 ; export name (i64.reinterpret_f64)
+0x2fe:	 0x0 										 ; export kind
+0x2ff:	 0x20 										 ; export index
+; section Code
+0x302:	 0xa 										 ; section code
+0x302:	 0xcf 										 ; section size
+0x303:	 0x21 										 ; number functions
+; function body 0
+0x304:	 0x5 										 ; function body size
+0x305:	 0x0 										 ; num locals
+0x306:	 0x20 										 ; get_local
+0x307:	 0x0 										 ; argument 0
+0x308:	 0xac 										 ; i64.extend_s/i32
+0x309:	 0xb 										 ; end
+; function body 1
+0x30a:	 0x5 										 ; function body size
+0x30b:	 0x0 										 ; num locals
+0x30c:	 0x20 										 ; get_local
+0x30d:	 0x0 										 ; argument 0
+0x30e:	 0xad 										 ; i64.extend_u/i32
+0x30f:	 0xb 										 ; end
+; function body 2
+0x310:	 0x5 										 ; function body size
+0x311:	 0x0 										 ; num locals
+0x312:	 0x20 										 ; get_local
+0x313:	 0x0 										 ; argument 0
+0x314:	 0xa7 										 ; i32.wrap/i64
+0x315:	 0xb 										 ; end
+; function body 3
+0x316:	 0x5 										 ; function body size
+0x317:	 0x0 										 ; num locals
+0x318:	 0x20 										 ; get_local
+0x319:	 0x0 										 ; argument 0
+0x31a:	 0xa8 										 ; i32.trunc_s/f32
+0x31b:	 0xb 										 ; end
+; function body 4
+0x31c:	 0x5 										 ; function body size
+0x31d:	 0x0 										 ; num locals
+0x31e:	 0x20 										 ; get_local
+0x31f:	 0x0 										 ; argument 0
+0x320:	 0xa9 										 ; i32.trunc_u/f32
+0x321:	 0xb 										 ; end
+; function body 5
+0x322:	 0x5 										 ; function body size
+0x323:	 0x0 										 ; num locals
+0x324:	 0x20 										 ; get_local
+0x325:	 0x0 										 ; argument 0
+0x326:	 0xaa 										 ; i32.trunc_s/f64
+0x327:	 0xb 										 ; end
+; function body 6
+0x328:	 0x5 										 ; function body size
+0x329:	 0x0 										 ; num locals
+0x32a:	 0x20 										 ; get_local
+0x32b:	 0x0 										 ; argument 0
+0x32c:	 0xab 										 ; i32.trunc_u/f64
+0x32d:	 0xb 										 ; end
+; function body 7
+0x32e:	 0x5 										 ; function body size
+0x32f:	 0x0 										 ; num locals
+0x330:	 0x20 										 ; get_local
+0x331:	 0x0 										 ; argument 0
+0x332:	 0xae 										 ; i64.trunc_s/f32
+0x333:	 0xb 										 ; end
+; function body 8
+0x334:	 0x5 										 ; function body size
+0x335:	 0x0 										 ; num locals
+0x336:	 0x20 										 ; get_local
+0x337:	 0x0 										 ; argument 0
+0x338:	 0xaf 										 ; i64.trunc_u/f32
+0x339:	 0xb 										 ; end
+; function body 9
+0x33a:	 0x5 										 ; function body size
+0x33b:	 0x0 										 ; num locals
+0x33c:	 0x20 										 ; get_local
+0x33d:	 0x0 										 ; argument 0
+0x33e:	 0xb0 										 ; i64.trunc_s/f64
+0x33f:	 0xb 										 ; end
+; function body 10
+0x340:	 0x5 										 ; function body size
+0x341:	 0x0 										 ; num locals
+0x342:	 0x20 										 ; get_local
+0x343:	 0x0 										 ; argument 0
+0x344:	 0xb1 										 ; i64.trunc_u/f64
+0x345:	 0xb 										 ; end
+; function body 11
+0x346:	 0x6 										 ; function body size
+0x347:	 0x0 										 ; num locals
+0x348:	 0x20 										 ; get_local
+0x349:	 0x0 										 ; argument 0
+0x34b:	 0xfc00 										 ; i32.trunc_sat_f32_s
+0x34c:	 0xb 										 ; end
+; function body 12
+0x34d:	 0x6 										 ; function body size
+0x34e:	 0x0 										 ; num locals
+0x34f:	 0x20 										 ; get_local
+0x350:	 0x0 										 ; argument 0
+0x352:	 0xfc01 										 ; i32.trunc_sat_f32_u
+0x353:	 0xb 										 ; end
+; function body 13
+0x354:	 0x6 										 ; function body size
+0x355:	 0x0 										 ; num locals
+0x356:	 0x20 										 ; get_local
+0x357:	 0x0 										 ; argument 0
+0x359:	 0xfc02 										 ; i32.trunc_sat_f64_s
+0x35a:	 0xb 										 ; end
+; function body 14
+0x35b:	 0x6 										 ; function body size
+0x35c:	 0x0 										 ; num locals
+0x35d:	 0x20 										 ; get_local
+0x35e:	 0x0 										 ; argument 0
+0x360:	 0xfc03 										 ; i32.trunc_sat_f64_u
+0x361:	 0xb 										 ; end
+; function body 15
+0x362:	 0x6 										 ; function body size
+0x363:	 0x0 										 ; num locals
+0x364:	 0x20 										 ; get_local
+0x365:	 0x0 										 ; argument 0
+0x367:	 0xfc04 										 ; i64.trunc_sat_f32_s
+0x368:	 0xb 										 ; end
+; function body 16
+0x369:	 0x6 										 ; function body size
+0x36a:	 0x0 										 ; num locals
+0x36b:	 0x20 										 ; get_local
+0x36c:	 0x0 										 ; argument 0
+0x36e:	 0xfc05 										 ; i64.trunc_sat_f32_u
+0x36f:	 0xb 										 ; end
+; function body 17
+0x370:	 0x6 										 ; function body size
+0x371:	 0x0 										 ; num locals
+0x372:	 0x20 										 ; get_local
+0x373:	 0x0 										 ; argument 0
+0x375:	 0xfc06 										 ; i64.trunc_sat_f64_s
+0x376:	 0xb 										 ; end
+; function body 18
+0x377:	 0x6 										 ; function body size
+0x378:	 0x0 										 ; num locals
+0x379:	 0x20 										 ; get_local
+0x37a:	 0x0 										 ; argument 0
+0x37c:	 0xfc07 										 ; i64.trunc_sat_f64_u
+0x37d:	 0xb 										 ; end
+; function body 19
+0x37e:	 0x5 										 ; function body size
+0x37f:	 0x0 										 ; num locals
+0x380:	 0x20 										 ; get_local
+0x381:	 0x0 										 ; argument 0
+0x382:	 0xb2 										 ; f32.convert_s/i32
+0x383:	 0xb 										 ; end
+; function body 20
+0x384:	 0x5 										 ; function body size
+0x385:	 0x0 										 ; num locals
+0x386:	 0x20 										 ; get_local
+0x387:	 0x0 										 ; argument 0
+0x388:	 0xb4 										 ; f32.convert_s/i64
+0x389:	 0xb 										 ; end
+; function body 21
+0x38a:	 0x5 										 ; function body size
+0x38b:	 0x0 										 ; num locals
+0x38c:	 0x20 										 ; get_local
+0x38d:	 0x0 										 ; argument 0
+0x38e:	 0xb7 										 ; f64.convert_s/i32
+0x38f:	 0xb 										 ; end
+; function body 22
+0x390:	 0x5 										 ; function body size
+0x391:	 0x0 										 ; num locals
+0x392:	 0x20 										 ; get_local
+0x393:	 0x0 										 ; argument 0
+0x394:	 0xb9 										 ; f64.convert_s/i64
+0x395:	 0xb 										 ; end
+; function body 23
+0x396:	 0x5 										 ; function body size
+0x397:	 0x0 										 ; num locals
+0x398:	 0x20 										 ; get_local
+0x399:	 0x0 										 ; argument 0
+0x39a:	 0xb3 										 ; f32.convert_u/i32
+0x39b:	 0xb 										 ; end
+; function body 24
+0x39c:	 0x5 										 ; function body size
+0x39d:	 0x0 										 ; num locals
+0x39e:	 0x20 										 ; get_local
+0x39f:	 0x0 										 ; argument 0
+0x3a0:	 0xb5 										 ; f32.convert_u/i64
+0x3a1:	 0xb 										 ; end
+; function body 25
+0x3a2:	 0x5 										 ; function body size
+0x3a3:	 0x0 										 ; num locals
+0x3a4:	 0x20 										 ; get_local
+0x3a5:	 0x0 										 ; argument 0
+0x3a6:	 0xb8 										 ; f64.convert_u/i32
+0x3a7:	 0xb 										 ; end
+; function body 26
+0x3a8:	 0x5 										 ; function body size
+0x3a9:	 0x0 										 ; num locals
+0x3aa:	 0x20 										 ; get_local
+0x3ab:	 0x0 										 ; argument 0
+0x3ac:	 0xba 										 ; f64.convert_u/i64
+0x3ad:	 0xb 										 ; end
+; function body 27
+0x3ae:	 0x5 										 ; function body size
+0x3af:	 0x0 										 ; num locals
+0x3b0:	 0x20 										 ; get_local
+0x3b1:	 0x0 										 ; argument 0
+0x3b2:	 0xbb 										 ; f64.promote/f32
+0x3b3:	 0xb 										 ; end
+; function body 28
+0x3b4:	 0x5 										 ; function body size
+0x3b5:	 0x0 										 ; num locals
+0x3b6:	 0x20 										 ; get_local
+0x3b7:	 0x0 										 ; argument 0
+0x3b8:	 0xb6 										 ; f32.demote/f64
+0x3b9:	 0xb 										 ; end
+; function body 29
+0x3ba:	 0x5 										 ; function body size
+0x3bb:	 0x0 										 ; num locals
+0x3bc:	 0x20 										 ; get_local
+0x3bd:	 0x0 										 ; argument 0
+0x3be:	 0xbe 										 ; f32.reinterpret/i32
+0x3bf:	 0xb 										 ; end
+; function body 30
+0x3c0:	 0x5 										 ; function body size
+0x3c1:	 0x0 										 ; num locals
+0x3c2:	 0x20 										 ; get_local
+0x3c3:	 0x0 										 ; argument 0
+0x3c4:	 0xbf 										 ; f64.reinterpret/i64
+0x3c5:	 0xb 										 ; end
+; function body 31
+0x3c6:	 0x5 										 ; function body size
+0x3c7:	 0x0 										 ; num locals
+0x3c8:	 0x20 										 ; get_local
+0x3c9:	 0x0 										 ; argument 0
+0x3ca:	 0xbc 										 ; i32.reinterpret/f32
+0x3cb:	 0xb 										 ; end
+; function body 32
+0x3cc:	 0x5 										 ; function body size
+0x3cd:	 0x0 										 ; num locals
+0x3ce:	 0x20 										 ; get_local
+0x3cf:	 0x0 										 ; argument 0
+0x3d0:	 0xbd 										 ; i64.reinterpret/f64
+0x3d1:	 0xb 										 ; end
+; end of program