# RUN: llc -march=mipsel -mcpu=mips32r6 -start-after=block-placement %s -o - | FileCheck %s
# Check that empty blocks in the cfg don't cause the mips hazard scheduler to
# crash and that the nop is inserted correctly.
# CHECK: blezc
# CHECK: nop
# CHECK: # %bb.1:
# CHECK: .insn
# CHECK: # %bb.2:
# CHECK: .insn
# CHECK: # %bb.3:
# CHECK: jal
--- |
; ModuleID = '<stdin>'
source_filename = "<stdin>"
target datalayout = "e-m:m-p:32:32-i8:8:32-i16:16:32-i64:64-n32-S64"
declare i32 @k()
declare void @f(i32)
define void @l5() {
entry:
%call = tail call i32 @k()
%cmp = icmp sgt i32 %call, 0
br i1 %cmp, label %if.then, label %if.end
if.then: ; preds = %entry
tail call void @f(i32 signext 2)
br label %if.end
if.end: ; preds = %if.then, %entry
ret void
}
---
name: l5
alignment: 4
exposesReturnsTwice: false
legalized: false
regBankSelected: false
selected: false
tracksRegLiveness: true
frameInfo:
isFrameAddressTaken: false
isReturnAddressTaken: false
hasStackMap: false
hasPatchPoint: false
stackSize: 24
offsetAdjustment: 0
maxAlignment: 4
adjustsStack: true
hasCalls: true
maxCallFrameSize: 16
hasOpaqueSPAdjustment: false
hasVAStart: false
hasMustTailInVarArgFunc: false
stack:
- { id: 0, type: spill-slot, offset: -4, size: 4, alignment: 4, callee-saved-register: '$ra' }
body: |
bb.0.entry:
successors: %bb.1.if.then(0x50000000), %bb.4.if.end(0x30000000)
liveins: $ra
$sp = ADDiu $sp, -24
CFI_INSTRUCTION def_cfa_offset 24
SW killed $ra, $sp, 20 :: (store (s32) into %stack.0)
CFI_INSTRUCTION offset $ra_64, -4
JAL @k, csr_o32_fp64, implicit-def dead $ra, implicit-def $sp, implicit-def $v0
BLEZ $v0, %bb.4.if.end, implicit-def $at
bb.1.if.then:
successors: %bb.2.if.then(0x80000000)
bb.2.if.then:
successors: %bb.3.if.then(0x80000000)
bb.3.if.then:
successors: %bb.4.if.end(0x80000000)
$a0 = ADDiu $zero, 2
JAL @f, csr_o32_fp64, implicit-def dead $ra, implicit killed $a0, implicit-def $sp
bb.4.if.end:
$ra = LW $sp, 20 :: (load (s32) from %stack.0)
$sp = ADDiu $sp, 24
PseudoReturn undef $ra
...
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