Group reference types in binary format. (#4774)

Grouping all references together makes it easier for baseline compilers to
zero out memory (as the zeroing out may be different for MVP types vs.
references).

This puts all references together, either at the start or the end. As a
heuristic for that we see if the first local is a reference. As the optimizer
will sort locals by frequency, this ensures that the most-frequent local
stays in index 0.

Fixes #4773. See more details there

1 files changed, 40 insertions, 3 deletions

diff --git a/test/typed-function-references.wast.fromBinary b/test/typed-function-references.wast.fromBinary
index e3839f33d..fefe37405 100644
--- a/test/typed-function-references.wast.fromBinary
+++ b/test/typed-function-references.wast.fromBinary
@@ -1,7 +1,7 @@
 (module
+ (type $mixed_results (func (result anyref f32 anyref f32)))
  (type $none_=>_none (func))
  (type $i32-i32 (func (param i32) (result i32)))
- (type $mixed_results (func (result anyref f32 anyref f32)))
  (type $=>eqref (func (result eqref)))
  (type $ref|$i32-i32|_=>_i32 (func (param (ref $i32-i32)) (result i32)))
  (type $ref?|$i32-i32|_=>_i32 (func (param (ref null $i32-i32)) (result i32)))
@@ -9,6 +9,7 @@
  (type $f64_=>_ref_null<_->_eqref> (func (param f64) (result (ref null $=>eqref))))
  (type $=>anyref (func (result anyref)))
  (type $none_=>_i32_ref?|$mixed_results|_f64 (func (result i32 (ref null $mixed_results) f64)))
+ (type $ref?|$mixed_results|_=>_none (func (param (ref null $mixed_results))))
  (elem declare func $call-ref $call-ref-more)
  (func $call-ref
   (call_ref
@@ -53,8 +54,8 @@
  )
  (func $type-only-in-tuple-local
   (local $x i32)
-  (local $1 (ref null $=>anyref))
-  (local $2 f64)
+  (local $1 f64)
+  (local $2 (ref null $=>anyref))
   (nop)
  )
  (func $type-only-in-tuple-block
@@ -92,5 +93,41 @@
    )
   )
  )
+ (func $ref-types-first
+  (local $r1 (ref null $mixed_results))
+  (local $r2 (ref null $mixed_results))
+  (local $r3 anyref)
+  (local $r4 anyref)
+  (local $r5 anyref)
+  (local $r6 funcref)
+  (local $i1 i32)
+  (local $i2 i64)
+  (local $i3 i64)
+  (nop)
+ )
+ (func $mvp-types-first
+  (local $i1 i32)
+  (local $i2 i64)
+  (local $i3 i64)
+  (local $r1 (ref null $mixed_results))
+  (local $r2 (ref null $mixed_results))
+  (local $r3 anyref)
+  (local $r4 anyref)
+  (local $r5 anyref)
+  (local $r6 funcref)
+  (nop)
+ )
+ (func $mvp-types-first-param (param $r0 (ref null $mixed_results))
+  (local $i1 i32)
+  (local $i2 i64)
+  (local $i3 i64)
+  (local $r1 (ref null $mixed_results))
+  (local $r2 (ref null $mixed_results))
+  (local $r3 anyref)
+  (local $r4 anyref)
+  (local $r5 anyref)
+  (local $r6 funcref)
+  (nop)
+ )
 )