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TheRock/compiler/amd-llvm/llvm/test/CodeGen/AArch64/arm64-windows-tailcall.ll
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derek.holloway 7502bf64a4
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43 lines
1.1 KiB
LLVM

; FIXME: Add tests for global-isel/fast-isel.
; RUN: llc < %s -mtriple=arm64-windows | FileCheck %s
%class.C = type { [1 x i32] }
define dso_local void @"?bar"(ptr inreg noalias sret(%class.C) %agg.result) {
entry:
; CHECK-LABEL: bar
; CHECK: mov x19, x0
; CHECK: bl "?foo"
; CHECK: mov x0, x19
tail call void @"?foo"(ptr dereferenceable(4) %agg.result)
ret void
}
declare dso_local void @"?foo"(ptr dereferenceable(4))
declare void @inreg_callee(ptr, ptr inreg sret(%class.C))
define void @inreg_caller_1(ptr %a, ptr inreg sret(%class.C) %b) {
; A different value is passed to the inreg parameter, so tail call is not possible.
; CHECK-LABEL: inreg_caller_1
; CHECK: mov x19, x1
; CHECK: bl inreg_callee
; CHECK: mov x0, x19
tail call void @inreg_callee(ptr %b, ptr inreg sret(%class.C) %a)
ret void
}
define void @inreg_caller_2(ptr %a, ptr inreg sret(%class.C) %b) {
; The inreg attribute and value line up between caller and callee, so it can
; be tail called.
; CHECK-LABEL: inreg_caller_2
; CHECK: b inreg_callee
tail call void @inreg_callee(ptr %a, ptr inreg sret(%class.C) %b)
ret void
}