From a40303aa0395822ab14a84d557ce0dff86261af6 Mon Sep 17 00:00:00 2001
From: Heejin Ahn <aheejin@gmail.com>
Date: Tue, 23 Oct 2018 00:28:14 +0000
Subject: [PATCH] [WebAssembly] Fix assembly printing of br_table

Summary: In `br_table's stack version asm string, \t was missing.

Reviewers: aardappel

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

Differential Revision: https://reviews.llvm.org/D53516

llvm-svn: 344981
---
 .../Target/WebAssembly/WebAssemblyInstrControl.td  |  4 +--
 llvm/test/CodeGen/WebAssembly/stack-insts.ll       | 32 ++++++++++++++++++++++
 2 files changed, 34 insertions(+), 2 deletions(-)
 create mode 100644 llvm/test/CodeGen/WebAssembly/stack-insts.ll

diff --git a/llvm/lib/Target/WebAssembly/WebAssemblyInstrControl.td b/llvm/lib/Target/WebAssembly/WebAssemblyInstrControl.td
index be9cdc5..0af94ef 100644
--- a/llvm/lib/Target/WebAssembly/WebAssemblyInstrControl.td
+++ b/llvm/lib/Target/WebAssembly/WebAssemblyInstrControl.td
@@ -51,7 +51,7 @@ def BR_TABLE_I32 : NI<(outs), (ins I32:$index, variable_ops),
 let BaseName = "BR_TABLE_I32" in
 def BR_TABLE_I32_S : NI<(outs), (ins variable_ops),
                         [], "true",
-                        "br_table", 0x0e> {
+                        "br_table \t", 0x0e> {
   let TSFlags{0} = 1;
   let TSFlags{1} = 1;
 }
@@ -65,7 +65,7 @@ def BR_TABLE_I64 : NI<(outs), (ins I64:$index, variable_ops),
 let BaseName = "BR_TABLE_I64" in
 def BR_TABLE_I64_S : NI<(outs), (ins variable_ops),
                         [], "true",
-                        "br_table"> {
+                        "br_table \t"> {
   let TSFlags{0} = 1;
   let TSFlags{1} = 1;
 }
diff --git a/llvm/test/CodeGen/WebAssembly/stack-insts.ll b/llvm/test/CodeGen/WebAssembly/stack-insts.ll
new file mode 100644
index 0000000..0876b4a
--- /dev/null
+++ b/llvm/test/CodeGen/WebAssembly/stack-insts.ll
@@ -0,0 +1,32 @@
+; RUN: llc < %s -asm-verbose=false -disable-wasm-fallthrough-return-opt -disable-block-placement -verify-machineinstrs | FileCheck %s
+
+target datalayout = "e-m:e-p:32:32-i64:64-n32:64-S128"
+target triple = "wasm32-unknown-unknown"
+
+declare void @foo0()
+declare void @foo1()
+
+; Tests if br_table is printed correctly with a tab.
+; CHECK-LABEL: test0:
+; CHECK-NOT: br_table0, 1, 0, 1, 0
+; CHECK: br_table 0, 1, 0, 1, 0
+define void @test0(i32 %n) {
+entry:
+  switch i32 %n, label %sw.epilog [
+    i32 0, label %sw.bb
+    i32 1, label %sw.bb.1
+    i32 2, label %sw.bb
+    i32 3, label %sw.bb.1
+  ]
+
+sw.bb:                                            ; preds = %entry, %entry
+  tail call void @foo0()
+  br label %sw.epilog
+
+sw.bb.1:                                          ; preds = %entry, %entry
+  tail call void @foo1()
+  br label %sw.epilog
+
+sw.epilog:                                        ; preds = %entry, %sw.bb, %sw.bb.1
+  ret void
+}
-- 
2.7.4