Imported Upstream version 5.18.0.161

Former-commit-id: 4db48158d3a35497b8f118ab21b5f08ac3d86d98

external/llvm/test/CodeGen/WebAssembly/phi.ll

@@ -0,0 +1,48 @@
+; RUN: llc < %s -asm-verbose=false -disable-wasm-fallthrough-return-opt -disable-wasm-explicit-locals -verify-machineinstrs | FileCheck %s
+
+; Test that phis are lowered.
+
+target datalayout = "e-m:e-p:32:32-i64:64-n32:64-S128"
+target triple = "wasm32-unknown-unknown-wasm"
+
+; Basic phi triangle.
+
+; CHECK-LABEL: test0:
+; CHECK: return $0
+; CHECK: div_s $push[[NUM0:[0-9]+]]=, $0, $pop[[NUM1:[0-9]+]]{{$}}
+; CHECK: return $pop[[NUM0]]{{$}}
+define i32 @test0(i32 %p) {
+entry:
+  %t = icmp slt i32 %p, 0
+  br i1 %t, label %true, label %done
+true:
+  %a = sdiv i32 %p, 3
+  br label %done
+done:
+  %s = phi i32 [ %a, %true ], [ %p, %entry ]
+  ret i32 %s
+}
+
+; Swap phis.
+
+; CHECK-LABEL: test1:
+; CHECK: .LBB1_1:
+; CHECK: copy_local $[[NUM0:[0-9]+]]=, $[[NUM1:[0-9]+]]{{$}}
+; CHECK: copy_local $[[NUM1]]=, $[[NUM2:[0-9]+]]{{$}}
+; CHECK: copy_local $[[NUM2]]=, $[[NUM0]]{{$}}
+define i32 @test1(i32 %n) {
+entry:
+  br label %loop
+
+loop:
+  %a = phi i32 [ 0, %entry ], [ %b, %loop ]
+  %b = phi i32 [ 1, %entry ], [ %a, %loop ]
+  %i = phi i32 [ 0, %entry ], [ %i.next, %loop ]
+
+  %i.next = add i32 %i, 1
+  %t = icmp slt i32 %i.next, %n
+  br i1 %t, label %loop, label %exit
+
+exit:
+  ret i32 %a
+}