From 0f41b0708384c1f5d85304d5ed94d9edd57d38c9 Mon Sep 17 00:00:00 2001
From: Thomas Lively <7121787+tlively@users.noreply.github.com>
Date: Wed, 19 Dec 2018 19:22:09 -0800
Subject: Do not precompute v128 expressions (#1839)

Without this change, sequences like `i32.const 0, i32x4.splat` will
get precomputed to v128.const ops, which are much larger and also not
implemented in V8 yet. Until we have SIMD-aware optimization passes or
at least engine support for v128.const, do not perform such
transformations.
---
 test/passes/precompute.txt  | 6 ++++++
 test/passes/precompute.wast | 5 +++++
 2 files changed, 11 insertions(+)

(limited to 'test')

diff --git a/test/passes/precompute.txt b/test/passes/precompute.txt
index 1c060fbef..b199da603 100644
--- a/test/passes/precompute.txt
+++ b/test/passes/precompute.txt
@@ -3,6 +3,7 @@
  (type $1 (func (result i32)))
  (type $2 (func))
  (type $3 (func (result f64)))
+ (type $4 (func (result v128)))
  (memory $0 0)
  (global $global i32 (i32.const 1))
  (global $global-mut (mut i32) (i32.const 2))
@@ -211,4 +212,9 @@
    (i32.const 2)
   )
  )
+ (func $no-simd-precompute (; 11 ;) (type $4) (result v128)
+  (i32x4.splat
+   (i32.const 0)
+  )
+ )
 )
diff --git a/test/passes/precompute.wast b/test/passes/precompute.wast
index 2c87d3706..54c8cf6d2 100644
--- a/test/passes/precompute.wast
+++ b/test/passes/precompute.wast
@@ -306,4 +306,9 @@
     )
    )
   )
+  (func $no-simd-precompute (result v128)
+   (i32x4.splat
+    (i32.const 0)
+   )
+  )
 )
-- 
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