[WebAssembly] v128.const

Summary:
This CL implements v128.const for each vector type. New operand types
are added to ensure the vector contents can be serialized without LEB
encoding. Tests are added for instruction selection, encoding,
assembly and disassembly.

Reviewers: aheejin, dschuff, aardappel

Subscribers: sbc100, jgravelle-google, sunfish, llvm-commits

Differential Revision: https://reviews.llvm.org/D50873

llvm-svn: 340336

1 files changed, 9 insertions, 0 deletions

diff --git a/llvm/lib/Target/WebAssembly/AsmParser/WebAssemblyAsmParser.cpp b/llvm/lib/Target/WebAssembly/AsmParser/WebAssemblyAsmParser.cpp
index 2d92b93ca70..0d591c04535 100644
--- a/llvm/lib/Target/WebAssembly/AsmParser/WebAssemblyAsmParser.cpp
+++ b/llvm/lib/Target/WebAssembly/AsmParser/WebAssemblyAsmParser.cpp
@@ -46,7 +46,9 @@ static unsigned MVTToWasmReg(MVT::SimpleValueType Type) {
     case MVT::v16i8: return WebAssembly::V128_0;
     case MVT::v8i16: return WebAssembly::V128_0;
     case MVT::v4i32: return WebAssembly::V128_0;
+    case MVT::v2i64: return WebAssembly::V128_0;
     case MVT::v4f32: return WebAssembly::V128_0;
+    case MVT::v2f64: return WebAssembly::V128_0;
     default: return MVT::INVALID_SIMPLE_VALUE_TYPE;
   }
 }
@@ -194,6 +196,7 @@ public:
                        const MCInstrInfo &mii, const MCTargetOptions &Options)
       : MCTargetAsmParser(Options, sti, mii), Parser(Parser),
         Lexer(Parser.getLexer()), LastLabel(nullptr) {
+    setAvailableFeatures(ComputeAvailableFeatures(sti.getFeatureBits()));
   }
 
 #define GET_ASSEMBLER_HEADER
@@ -232,7 +235,13 @@ public:
         .Case("i8x16", MVT::v16i8)
         .Case("i16x8", MVT::v8i16)
         .Case("i32x4", MVT::v4i32)
+        .Case("i64x2", MVT::v2i64)
         .Case("f32x4", MVT::v4f32)
+        .Case("f64x2", MVT::v2f64)
+        // arbitrarily chosen vector type to associate with "v128"
+        // FIXME: should these be EVTs to avoid this arbitrary hack? Do we want
+        // to accept more specific SIMD register types?
+        .Case("v128", MVT::v16i8)
         .Default(MVT::INVALID_SIMPLE_VALUE_TYPE);
   }