asm2wasm i64 support (#723)

* support i64 intrinsics from fastcomp, adding --wasm-only flag

* refactor callImport logic in asm2wasm to avoid recomputing wasm types again

* legalize illegal i64 params in exports and imports

* do safe i64 binary ops depending on precision

* fix addVar, only assert on names if we are using a name

1 files changed, 10 insertions, 2 deletions

diff --git a/src/emscripten-optimizer/parser.h b/src/emscripten-optimizer/parser.h
index 9429ff87f..060b71272 100644
--- a/src/emscripten-optimizer/parser.h
+++ b/src/emscripten-optimizer/parser.h
@@ -69,6 +69,8 @@ extern IString TOPLEVEL,
                UNARY_PREFIX,
                UNARY_POSTFIX,
                MATH_FROUND,
+               INT64,
+               INT64_CONST,
                SIMD_FLOAT32X4,
                SIMD_FLOAT64X2,
                SIMD_INT8X16,
@@ -549,8 +551,8 @@ class Parser {
           if (value.isNumber()) {
             arg = parseFrag(value);
             src += value.size;
-          } else {
-            assert(value.type == OPERATOR);
+          } else if (value.type == OPERATOR) {
+            // negative number
             assert(value.str == MINUS);
             src += value.size;
             skipSpace(src);
@@ -558,6 +560,12 @@ class Parser {
             assert(value2.isNumber());
             arg = Builder::makePrefix(MINUS, parseFrag(value2));
             src += value2.size;
+          } else {
+            // identifier and function call
+            assert(value.type == IDENT);
+            src += value.size;
+            skipSpace(src);
+            arg = parseCall(parseFrag(value), src);
           }
           Builder::appendCaseToSwitch(ret, arg);
           skipSpace(src);