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da7fa59d26
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
26 lines
877 B
LLVM
26 lines
877 B
LLVM
; RUN: llc -o - %s | FileCheck %s
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; RUN: llc -global-isel -verify-machineinstrs -o - %s | FileCheck %s
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target triple="aarch64--"
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declare void @somefunc()
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define preserve_mostcc void @test_ccmismatch_notail() {
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; Ensure that no tail call is used here, as the called function somefunc does
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; not preserve enough registers for preserve_mostcc.
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; CHECK-LABEL: test_ccmismatch_notail:
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; CHECK-NOT: b somefunc
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; CHECK: bl somefunc
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tail call void @somefunc()
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ret void
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}
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declare preserve_mostcc void @some_preserve_most_func()
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define void @test_ccmismatch_tail() {
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; We can perform a tail call here, because some_preserve_most_func preserves
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; all registers necessary for test_ccmismatch_tail.
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; CHECK-LABEL: test_ccmismatch_tail:
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; CHECK-NOT: bl some_preserve_most_func
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; CHECK: b some_preserve_most_func
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tail call preserve_mostcc void @some_preserve_most_func()
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ret void
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}
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