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9984790824
We can only perform a tail call to a callee that preserves all the registers that the caller needs to preserve. This situation happens with calling conventions like preserver_mostcc or cxx_fast_tls. It was explicitely handled for fast_tls and failing for preserve_most. This patch generalizes the check to any calling convention. Related to rdar://24207743 Differential Revision: http://reviews.llvm.org/D18680 llvm-svn: 265329
25 lines
808 B
LLVM
25 lines
808 B
LLVM
; RUN: llc -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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