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d1cad41742
According to MSDN (see the PR), functions which don't touch any callee-saved registers (including %rsp) don't need any unwind info. This patch makes LLVM not emit unwind info for such functions, to save binary size. Differential Revision: https://reviews.llvm.org/D24748 llvm-svn: 282185
37 lines
1020 B
LLVM
37 lines
1020 B
LLVM
; RUN: llc < %s | FileCheck %s
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target datalayout = "e-m:w-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-w64-windows-gnu"
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@llvm.global_ctors = appending global [1 x { i32, void ()*, i8* }] [{ i32, void ()*, i8* } { i32 65535, void ()* @g, i8* null }]
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declare i32 @__gxx_personality_seh0(...)
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; Function Attrs: nounwind
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define void @f() #0 personality i8* bitcast (i32 (...)* @__gxx_personality_seh0 to i8*) {
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entry:
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invoke void @g()
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to label %exit unwind label %lpad
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lpad: ; preds = %entry
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landingpad { i8*, i32 }
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cleanup
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unreachable
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exit: ; preds = %entry
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unreachable
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}
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; CHECK-LABEL: f:
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; CHECK: .seh_proc f
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; CHECK: .seh_handler __gxx_personality_seh0, @unwind, @except
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; CHECK: callq g
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; CHECK: .seh_handlerdata
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; CHECK: .seh_endproc
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define void @g() {
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unreachable
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}
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; CHECK-LABEL: g:
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; CHECK: ud2
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attributes #0 = { nounwind }
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