# RUN: llc -mtriple=wasm32-unknown-unknown -run-pass wasm-fix-irreducible-control-flow %s -o - | FileCheck %s
# This tests if we correctly create at most 2 routing blocks per entry block,
# and also whether those routing blocks are generated in the correct place. If
# one of the predecessor is the layout predecessor of an entry, a routing block
# for the entry should be generated right after the layout predecessor.
--- |
target triple = "wasm32-unknown-unknown"
define void @test0() {
pred0:
ret void
pred1:
ret void
entry0:
ret void
entry1:
ret void
}
...
---
# CHECK-LABEL: test0
name: test0
liveins:
- { reg: '$arguments' }
body: |
bb.0.pred0:
successors: %bb.1, %bb.2
liveins: $arguments
%0:i32 = CONST_I32 100, implicit-def $arguments
BR_IF %bb.2, %0:i32, implicit-def $arguments
; CHECK: bb.0.pred0:
; CHECK: %1:i32 = IMPLICIT_DEF
; CHECK-NEXT: %0:i32 = IMPLICIT_DEF
; CHECK: BR_IF %bb.2, %0, implicit-def $arguments
bb.1.pred1:
; predecessors: %bb.1
successors: %bb.2, %bb.3
BR_IF %bb.3, %0:i32, implicit-def $arguments
; CHECK: bb.1.pred1:
; CHECK: BR_IF %bb.7, %0, implicit-def $arguments
; This falls through to bb.2, so we don't need an additional BR here
; CHECK-NOT: BR
; Routing block for entry0, when predecessor is outside the loop
; This routing block is shared between the two predecessors: pred0 and pred1.
; CHECK: bb.2:
; CHECK: %1:i32 = CONST_I32 0, implicit-def $arguments
; CHECK-NEXT: BR %bb.6, implicit-def $arguments
bb.2.entry0:
; predecessors: %bb.0, %bb.1, %bb.1
successors: %bb.3
BR %bb.3, implicit-def $arguments
; CHECK: bb.3.entry0:
; CHECK: BR %bb.4, implicit-def $arguments
; Routing block for entry1, when predecessor is inside the loop
; CHECK: bb.4:
; CHECK: %1:i32 = CONST_I32 1, implicit-def $arguments
; CHECK-NEXT: BR %bb.6, implicit-def $arguments
bb.3.entry1:
; predecessors: %bb.1, %bb.2
successors: %bb.2
BR %bb.2, implicit-def $arguments
; CHECK: bb.5.entry1:
; CHECK: BR %bb.8, implicit-def $arguments
; Dispatch block
; CHECK: bb.6:
; CHECK: BR_TABLE_I32 %1, %bb.3, %bb.5, %bb.5, implicit-def $arguments
; Routing block for entry1, when predecessor is outside the loop
; CHECK: bb.7:
; CHECK: %1:i32 = CONST_I32 1, implicit-def $arguments
; CHECK-NEXT: BR %bb.6, implicit-def $arguments
; Routing block for entry0, when predecessor is inside the loop
; CHECK: bb.8:
; CHECK: %1:i32 = CONST_I32 0, implicit-def $arguments
; CHECK-NEXT: BR %bb.6, implicit-def $arguments
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