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24ededda78
Since we now lower most tail calls, it makes sense to support musttail. Instead of always falling back to SelectionDAG, only fall back when a musttail call was not able to be emitted as a tail call. Once we can handle most incoming and outgoing arguments, we can change this to a `report_fatal_error` like in ISelLowering. Remove the assert that we don't have varargs and a musttail, and replace it with a return false. Implementing this requires that we implement `saveVarArgRegisters` from AArch64ISelLowering, which is an entirely different patch. Add GlobalISel lines to vararg-tallcall.ll to make sure that we produce correct code. Right now we only fall back, but eventually this will be relevant. Differential Revision: https://reviews.llvm.org/D67681 llvm-svn: 372273
37 lines
1.5 KiB
LLVM
37 lines
1.5 KiB
LLVM
; RUN: llc -mtriple=aarch64-windows-msvc %s -o - | FileCheck %s
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; RUN: llc -mtriple=aarch64-linux-gnu %s -o - | FileCheck %s
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; RUN: llc -global-isel -global-isel-abort=2 -verify-machineinstrs -mtriple=aarch64-windows-msvc %s -o - | FileCheck %s
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; RUN: llc -global-isel -global-isel-abort=2 -verify-machineinstrs -mtriple=aarch64-linux-gnu %s -o - | FileCheck %s
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target datalayout = "e-m:w-p:64:64-i32:32-i64:64-i128:128-n32:64-S128"
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%class.X = type { i8 }
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%struct.B = type { i32 (...)** }
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$"??_9B@@$BA@AA" = comdat any
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; Function Attrs: noinline optnone
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define linkonce_odr void @"??_9B@@$BA@AA"(%struct.B* %this, ...) #1 comdat align 2 {
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entry:
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%this.addr = alloca %struct.B*, align 8
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store %struct.B* %this, %struct.B** %this.addr, align 8
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%this1 = load %struct.B*, %struct.B** %this.addr, align 8
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call void asm sideeffect "", "~{d0}"()
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%0 = bitcast %struct.B* %this1 to void (%struct.B*, ...)***
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%vtable = load void (%struct.B*, ...)**, void (%struct.B*, ...)*** %0, align 8
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%vfn = getelementptr inbounds void (%struct.B*, ...)*, void (%struct.B*, ...)** %vtable, i64 0
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%1 = load void (%struct.B*, ...)*, void (%struct.B*, ...)** %vfn, align 8
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musttail call void (%struct.B*, ...) %1(%struct.B* %this1, ...)
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ret void
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; No predecessors!
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ret void
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}
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attributes #1 = { noinline optnone "thunk" }
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; CHECK: mov v16.16b, v0.16b
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; CHECK: ldr x9, [x0]
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; CHECK: ldr x9, [x9]
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; CHECK: mov v0.16b, v16.16b
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; CHECK: br x9
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