ifcvt_triangleWoCvtToNextEdge.mir
1.24 KB
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# RUN: llc -mtriple=thumb-apple-ios -run-pass=if-converter %s -o - | FileCheck %s
--- |
declare void @__stack_chk_fail()
declare void @bar()
define void @foo() {
ret void
}
...
---
name: foo
body: |
bb.0:
tBcc %bb.1, 1, $cpsr
tB %bb.2, 14, $noreg
bb.1:
tBcc %bb.3, 0, $cpsr
bb.2:
successors:
tBL 14, $cpsr, @__stack_chk_fail
bb.3:
successors:
$sp = tADDspi $sp, 2, 14, _
$sp = tADDspi $sp, 2, 14, _
tTAILJMPdND @bar, 14, $cpsr
...
# bb.2 has no successors, presumably because __stack_chk_fail doesn't return,
# so there should be no edge from bb.2 to bb.3.
# Nevertheless, IfConversion treats bb.1, bb.2, bb.3 as a triangle and
# inserts a predicated copy of bb.2 in bb.1.
# This caused r302876 to die with a failed assertion.
# CHECK: bb.0:
# CHECK: successors: %bb.2(0x40000000), %bb.1(0x40000000)
# CHECK: tBcc %bb.2, 1, $cpsr
# CHECK: bb.1:
# CHECK-NOT: successors: %bb
# CHECK: tBL 14, $cpsr, @__stack_chk_fail
# CHECK: bb.2:
# CHECK-NOT: successors: %bb
# CHECK: tBL 1, $cpsr, @__stack_chk_fail
# CHECK: $sp = tADDspi $sp, 2, 14, $noreg
# CHECK: $sp = tADDspi $sp, 2, 14, $noreg
# CHECK: tTAILJMPdND @bar, 14, $cpsr