[PATCH] D57933: [WebAssembly] Fixed Disassembler ignoring endian swap on big endian.

[Wouter van Oortmerssen via Phabricator via llvm-commits]

aardappel created this revision.
aardappel added a reviewer: aheejin.
Herald added subscribers: llvm-commits, sunfish, jgravelle-google, sbc100, dschuff.
Herald added a project: LLVM.

This fixes: https://bugs.llvm.org/show_bug.cgi?id=40620


Repository:
  rL LLVM

https://reviews.llvm.org/D57933

Files:
  lib/Target/WebAssembly/Disassembler/WebAssemblyDisassembler.cpp
  test/MC/Disassembler/WebAssembly/wasm.txt


Index: test/MC/Disassembler/WebAssembly/wasm.txt
===================================================================
--- test/MC/Disassembler/WebAssembly/wasm.txt
+++ test/MC/Disassembler/WebAssembly/wasm.txt
@@ -35,7 +35,7 @@
 
 # FIXME Disabled temporarily due to failures in clang-ppc64be-linux and
 # clang-s390x-linux bots
-# C HECK: v128.const 50462976, 117835012, 185207048, 252579084
+# CHECK: v128.const 50462976, 117835012, 185207048, 252579084
 0xFD 0x02 0x00 0x01 0x02 0x03 0x04 0x05 0x06 0x07 0x08 0x09 0x0A 0x0B 0x0C 0x0D 0x0E 0x0F
 
 # CHECK: v8x16.shuffle 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15
Index: lib/Target/WebAssembly/Disassembler/WebAssemblyDisassembler.cpp
===================================================================
--- lib/Target/WebAssembly/Disassembler/WebAssemblyDisassembler.cpp
+++ lib/Target/WebAssembly/Disassembler/WebAssemblyDisassembler.cpp
@@ -108,9 +108,8 @@
 bool parseImmediate(MCInst &MI, uint64_t &Size, ArrayRef<uint8_t> Bytes) {
   if (Size + sizeof(T) > Bytes.size())
     return false;
-  T Val;
-  memcpy(&Val, Bytes.data() + Size, sizeof(T));
-  support::endian::byte_swap<T, support::endianness::little>(Val);
+  T Val = support::endian::read<T, support::endianness::little, alignof(T)>(
+      Bytes.data() + Size);
   Size += sizeof(T);
   if (std::is_floating_point<T>::value) {
     MI.addOperand(MCOperand::createFPImm(static_cast<double>(Val)));


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