Fix conversion to float32, typing issue, split apart asm-wasm tests.

src/wasm/asm-wasm-builder.cc

Index: src/wasm/asm-wasm-builder.cc
diff --git a/src/wasm/asm-wasm-builder.cc b/src/wasm/asm-wasm-builder.cc
index fe6abdaaf8bb110e06b434b868d016f6e27ad624..4c7410d7e004c612e809db7f3ccc06da5da3188e 100644
--- a/src/wasm/asm-wasm-builder.cc
+++ b/src/wasm/asm-wasm-builder.cc
@@ -997,6 +997,22 @@ class AsmWasmBuilderImpl : public AstVisitor {
             return true;
           }
         }
+        switch (TypeIndexOf(args->at(0))) {
+          case kInt32:
+          case kFixnum:
+            current_function_builder_->Emit(kExprF32SConvertI32);

[titzer, 2016/03/21 07:59:44]

These won't be semantically correct due to WASM, so please drop in a TODO in
wasm-compiler.cc that it needs to handle the asm.js case.

[bradn, 2016/03/21 20:31:08]

I think these are ok as is (or have I forgotten something?). The other direction
requires special care, but that already appears to be there.

Added TODOs. Will discuss separately.

+            break;
+          case kUint32:
+            current_function_builder_->Emit(kExprF32UConvertI32);
+            break;
+          case kFloat32:
+            break;
+          case kFloat64:
+            current_function_builder_->Emit(kExprF32ConvertF64);
+            break;
+          default:
+            UNREACHABLE();
+        }
         break;
       }
       default: {