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[AArch64, fast-isel] Fall back to SelectionDAG to select tail calls.

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Certain functions such as objc_autoreleaseReturnValue have to be called as
tail-calls even at -O0. Since normal fast-isel doesn't emit calls as tail calls,
we have to fall back to SelectionDAG to select calls that are marked as tail.

<rdar://problem/17991614>



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@215600 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Akira Hatanaka 2014-08-13 23:23:58 +00:00
parent 8c9a0319bb
commit d0ddfb0896
3 changed files with 19 additions and 1 deletions
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5
lib/Target/AArch64/AArch64FastISel.cpp
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@ -1687,10 +1687,15 @@ bool AArch64FastISel::FinishCall(CallLoweringInfo &CLI, MVT RetVT,
bool AArch64FastISel::FastLowerCall(CallLoweringInfo &CLI) {
CallingConv::ID CC = CLI.CallConv;
bool IsTailCall = CLI.IsTailCall;
bool IsVarArg = CLI.IsVarArg;
const Value *Callee = CLI.Callee;
const char *SymName = CLI.SymName;
// Allow SelectionDAG isel to handle tail calls.
if (IsTailCall)
return false;
CodeModel::Model CM = TM.getCodeModel();
// Only support the small and large code model.
if (CM != CodeModel::Small && CM != CodeModel::Large)

4
test/CodeGen/AArch64/arm64-abi_align.ll
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@ -511,7 +511,9 @@ entry:
; CHECK: str {{w[0-9]+}}, [sp]
; FAST-LABEL: i64_split
; FAST: ldr x7, [{{x[0-9]+}}]
; FAST: str {{w[0-9]+}}, [sp]
; FAST: mov x[[R0:[0-9]+]], sp
; FAST: orr w[[R1:[0-9]+]], wzr, #0x8
; FAST: str w[[R1]], {{\[}}x[[R0]]{{\]}}
%0 = load i64* bitcast (%struct.s41* @g41 to i64*), align 16
%call = tail call i32 @callee_i64(i32 1, i32 2, i32 3, i32 4, i32 5,
i32 6, i32 7, i64 %0, i32 8) #5

11
test/CodeGen/AArch64/tailcall-fastisel.ll Normal file
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@ -0,0 +1,11 @@
; RUN: llc < %s -mtriple=arm64-apple-darwin -O0 | FileCheck %s
; CHECK: b _foo0
define i32 @foo1() {
entry:
%call = tail call i32 @foo0()
ret i32 %call
}
declare i32 @foo0()