[WebAssembly] Initial SIMD128 support.

Kicks off the implementation of wasm SIMD128 support (spec:
https://github.com/stoklund/portable-simd/blob/master/portable-simd.md),
adding support for add, sub, mul for i8x16, i16x8, i32x4, and f32x4.

The spec is WIP, and might change in the near future.

Patch by João Porto

Differential Revision: https://reviews.llvm.org/D22686

llvm-svn: 277543

1 files changed, 5 insertions, 1 deletions

diff --git a/llvm/lib/Target/WebAssembly/WebAssemblyPrepareForLiveIntervals.cpp b/llvm/lib/Target/WebAssembly/WebAssemblyPrepareForLiveIntervals.cpp
index 30444ac598a..7417cded5cc 100644
--- a/llvm/lib/Target/WebAssembly/WebAssemblyPrepareForLiveIntervals.cpp
+++ b/llvm/lib/Target/WebAssembly/WebAssemblyPrepareForLiveIntervals.cpp
@@ -65,6 +65,10 @@ static bool IsArgument(const MachineInstr *MI) {
   case WebAssembly::ARGUMENT_I64:
   case WebAssembly::ARGUMENT_F32:
   case WebAssembly::ARGUMENT_F64:
+  case WebAssembly::ARGUMENT_v16i8:
+  case WebAssembly::ARGUMENT_v8i16:
+  case WebAssembly::ARGUMENT_v4i32:
+  case WebAssembly::ARGUMENT_v4f32:
     return true;
   default:
     return false;
@@ -73,7 +77,7 @@ static bool IsArgument(const MachineInstr *MI) {
 
 // Test whether the given register has an ARGUMENT def.
 static bool HasArgumentDef(unsigned Reg, const MachineRegisterInfo &MRI) {
-  for (auto &Def : MRI.def_instructions(Reg))
+  for (const auto &Def : MRI.def_instructions(Reg))
     if (IsArgument(&Def))
       return true;
   return false;