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llvm-mirror/test/CodeGen/AArch64/tailcall-ccmismatch.ll
Jessica Paquette da7fa59d26 [AArch64][GlobalISel] Support sibling calls with mismatched calling conventions
Add support for sibcalling calls whose calling convention differs from the
caller's.

- Port over `CCState::resultsCombatible` from CallingConvLower.cpp into
  CallLowering. This is used to verify that the way the caller and callee CC
  handle incoming arguments matches up.

- Add `CallLowering::analyzeCallResult`. This is basically a port of
  `CCState::AnalyzeCallResult`, but using `ArgInfo` rather than `ISD::InputArg`.

- Add `AArch64CallLowering::doCallerAndCalleePassArgsTheSameWay`. This checks
  that the calling conventions are compatible, and that the caller and callee
  preserve the same registers.

For testing:

- Update call-translator-tail-call.ll to show that we can now handle this.

- Add a GISel line to tailcall-ccmismatch.ll to show that we will not tail call
  when the regmasks don't line up.

Differential Revision: https://reviews.llvm.org/D67361

llvm-svn: 371570
2019-09-10 23:25:12 +00:00

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877 B
LLVM

; RUN: llc -o - %s | FileCheck %s
; RUN: llc -global-isel -verify-machineinstrs -o - %s | FileCheck %s
target triple="aarch64--"
declare void @somefunc()
define preserve_mostcc void @test_ccmismatch_notail() {
; Ensure that no tail call is used here, as the called function somefunc does
; not preserve enough registers for preserve_mostcc.
; CHECK-LABEL: test_ccmismatch_notail:
; CHECK-NOT: b somefunc
; CHECK: bl somefunc
tail call void @somefunc()
ret void
}
declare preserve_mostcc void @some_preserve_most_func()
define void @test_ccmismatch_tail() {
; We can perform a tail call here, because some_preserve_most_func preserves
; all registers necessary for test_ccmismatch_tail.
; CHECK-LABEL: test_ccmismatch_tail:
; CHECK-NOT: bl some_preserve_most_func
; CHECK: b some_preserve_most_func
tail call preserve_mostcc void @some_preserve_most_func()
ret void
}