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precommit test for pr60855
This test demonstrates an issue with callbr outputs being used along indirect edges when using regallocfast. Link: #60855 Differential Revision: https://reviews.llvm.org/D144906
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‎llvm/test/CodeGen/X86/callbr-asm-outputs-regallocfast.mir

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# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py
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# RUN: llc -run-pass=regallocfast -verify-machineinstrs %s -o - | FileCheck %s
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--- |
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; ModuleID = 'x.c'
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source_filename = "x.c"
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target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux-gnu"
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; Function Attrs: noinline nounwind optnone
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define dso_local i32 @main() #0 {
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entry:
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%retval = alloca i32, align 4
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%x = alloca i32, align 4
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store i32 0, ptr %retval, align 4
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store i32 123, ptr %x, align 4
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%0 = callbr i32 asm "mov $1, $0\0A\09jmp ${2:l}", "=r,r,!i,~{dirflag},~{fpsr},~{flags}"(i32 45) #2
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to label %asm.fallthrough [label %label.split], !srcloc !5
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asm.fallthrough: ; preds = %entry
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store i32 %0, ptr %x, align 4
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store i32 6, ptr %x, align 4
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br label %label
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label: ; preds = %asm.fallthrough, %label.split
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%1 = load i32, ptr %x, align 4
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ret i32 %1
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label.split: ; preds = %entry
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%2 = call i32 @llvm.callbr.landingpad.i32(i32 %0)
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store i32 %2, ptr %x, align 4
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br label %label
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}
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; Function Attrs: nomerge nounwind
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declare i32 @llvm.callbr.landingpad.i32(i32) #1
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attributes #0 = { noinline nounwind optnone "frame-pointer"="all" "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
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attributes #1 = { nomerge nounwind }
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attributes #2 = { nounwind memory(none) }
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!llvm.module.flags = !{!0, !1, !2, !3}
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!llvm.ident = !{!4}
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!0 = !{i32 1, !"wchar_size", i32 4}
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!1 = !{i32 8, !"PIC Level", i32 2}
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!2 = !{i32 7, !"PIE Level", i32 2}
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!3 = !{i32 7, !"frame-pointer", i32 2}
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!4 = !{!"clang version 17.0.0 ([email protected]:llvm/llvm-project.git cf86855c4453d029a9b9ed8c4c4c18cefc1bc895)"}
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!5 = !{i64 166, i64 179}
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...
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---
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name: main
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alignment: 16
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exposesReturnsTwice: false
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legalized: false
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regBankSelected: false
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selected: false
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failedISel: false
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tracksRegLiveness: true
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hasWinCFI: false
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callsEHReturn: false
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callsUnwindInit: false
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hasEHCatchret: false
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hasEHScopes: false
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hasEHFunclets: false
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debugInstrRef: false
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failsVerification: false
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tracksDebugUserValues: false
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registers:
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- { id: 0, class: gr32, preferred-register: '' }
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- { id: 1, class: gr32, preferred-register: '' }
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- { id: 2, class: gr32, preferred-register: '' }
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- { id: 3, class: gr32, preferred-register: '' }
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- { id: 4, class: gr32, preferred-register: '' }
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- { id: 5, class: gr32, preferred-register: '' }
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- { id: 6, class: gr32, preferred-register: '' }
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liveins: []
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frameInfo:
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isFrameAddressTaken: false
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isReturnAddressTaken: false
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hasStackMap: false
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hasPatchPoint: false
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stackSize: 0
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offsetAdjustment: 0
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maxAlignment: 4
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adjustsStack: false
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hasCalls: false
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stackProtector: ''
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functionContext: ''
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maxCallFrameSize: 4294967295
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cvBytesOfCalleeSavedRegisters: 0
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hasOpaqueSPAdjustment: false
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hasVAStart: false
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hasMustTailInVarArgFunc: false
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hasTailCall: false
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localFrameSize: 0
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savePoint: ''
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restorePoint: ''
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fixedStack: []
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stack:
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- { id: 0, name: retval, type: default, offset: 0, size: 4, alignment: 4,
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stack-id: default, callee-saved-register: '', callee-saved-restored: true,
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debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
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- { id: 1, name: x, type: default, offset: 0, size: 4, alignment: 4,
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stack-id: default, callee-saved-register: '', callee-saved-restored: true,
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debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
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callSites: []
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debugValueSubstitutions: []
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constants: []
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machineFunctionInfo: {}
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body: |
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; CHECK-LABEL: name: main
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; CHECK: bb.0.entry:
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; CHECK-NEXT: successors: %bb.1(0x40000000), %bb.3(0x40000000)
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; CHECK-NEXT: {{ $}}
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; CHECK-NEXT: MOV32mi %stack.0.retval, 1, $noreg, 0, $noreg, 0 :: (store (s32) into %ir.retval)
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; CHECK-NEXT: MOV32mi %stack.1.x, 1, $noreg, 0, $noreg, 123 :: (store (s32) into %ir.x)
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; CHECK-NEXT: renamable $eax = MOV32ri 45
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; CHECK-NEXT: INLINEASM_BR &"mov $1, $0\0A\09jmp ${2:l}", 0 /* attdialect */, 2359306 /* regdef:GR32 */, def renamable $eax, 2359305 /* reguse:GR32 */, killed renamable $eax, 13 /* imm */, %bb.3, 12 /* clobber */, implicit-def dead early-clobber $df, 12 /* clobber */, implicit-def early-clobber $fpsw, 12 /* clobber */, implicit-def dead early-clobber $eflags, !5
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; CHECK-NEXT: MOV32mr %stack.3, 1, $noreg, 0, $noreg, $eax :: (store (s32) into %stack.3)
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; CHECK-NEXT: MOV32mr %stack.2, 1, $noreg, 0, $noreg, killed $eax :: (store (s32) into %stack.2)
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; CHECK-NEXT: JMP_1 %bb.1
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; CHECK-NEXT: {{ $}}
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; CHECK-NEXT: bb.1.asm.fallthrough:
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; CHECK-NEXT: successors: %bb.2(0x80000000)
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; CHECK-NEXT: {{ $}}
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; CHECK-NEXT: $eax = MOV32rm %stack.2, 1, $noreg, 0, $noreg :: (load (s32) from %stack.2)
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; CHECK-NEXT: MOV32mr %stack.1.x, 1, $noreg, 0, $noreg, renamable $eax :: (store (s32) into %ir.x)
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; CHECK-NEXT: MOV32mi %stack.1.x, 1, $noreg, 0, $noreg, 6 :: (store (s32) into %ir.x)
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; CHECK-NEXT: {{ $}}
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; CHECK-NEXT: bb.2.label:
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; CHECK-NEXT: renamable $eax = MOV32rm %stack.1.x, 1, $noreg, 0, $noreg :: (load (s32) from %ir.x)
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; CHECK-NEXT: RET64 implicit killed $eax
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; CHECK-NEXT: {{ $}}
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; CHECK-NEXT: bb.3.label.split (machine-block-address-taken, inlineasm-br-indirect-target):
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; CHECK-NEXT: successors: %bb.2(0x80000000)
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; CHECK-NEXT: {{ $}}
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; FIXME: this is a load from a stack slot that hasn't been stored to yet!
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; CHECK-NEXT: $eax = MOV32rm %stack.3, 1, $noreg, 0, $noreg :: (load (s32) from %stack.3)
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; CHECK-NEXT: MOV32mr %stack.1.x, 1, $noreg, 0, $noreg, killed renamable $eax :: (store (s32) into %ir.x)
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; CHECK-NEXT: JMP_1 %bb.2
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bb.0.entry:
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successors: %bb.1(0x40000000), %bb.3(0x40000000)
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MOV32mi %stack.0.retval, 1, $noreg, 0, $noreg, 0 :: (store (s32) into %ir.retval)
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MOV32mi %stack.1.x, 1, $noreg, 0, $noreg, 123 :: (store (s32) into %ir.x)
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%2:gr32 = MOV32ri 45
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INLINEASM_BR &"mov $1, $0\0A\09jmp ${2:l}", 0 /* attdialect */, 2359306 /* regdef:GR32 */, def %1, 2359305 /* reguse:GR32 */, %2, 13 /* imm */, %bb.3, 12 /* clobber */, implicit-def early-clobber $df, 12 /* clobber */, implicit-def early-clobber $fpsw, 12 /* clobber */, implicit-def early-clobber $eflags, !5
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%0:gr32 = COPY %1
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JMP_1 %bb.1
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bb.1.asm.fallthrough:
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successors: %bb.2(0x80000000)
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MOV32mr %stack.1.x, 1, $noreg, 0, $noreg, %0 :: (store (s32) into %ir.x)
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MOV32mi %stack.1.x, 1, $noreg, 0, $noreg, 6 :: (store (s32) into %ir.x)
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bb.2.label:
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%6:gr32 = MOV32rm %stack.1.x, 1, $noreg, 0, $noreg :: (load (s32) from %ir.x)
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$eax = COPY %6
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RET64 implicit $eax
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bb.3.label.split (machine-block-address-taken, inlineasm-br-indirect-target):
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successors: %bb.2(0x80000000)
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%3:gr32 = COPY %1
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MOV32mr %stack.1.x, 1, $noreg, 0, $noreg, %3 :: (store (s32) into %ir.x)
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JMP_1 %bb.2
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...

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