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719039ac2c
Add NoTrapAfterNoreturn target option which skips emission of traps behind noreturn calls even if TrapUnreachable is enabled. Enable the feature on Mach-O to save code size; Comments suggest it is not possible to enable it for the other users of TrapUnreachable. rdar://41530228 DifferentialRevision: https://reviews.llvm.org/D48674 llvm-svn: 335877
30 lines
795 B
LLVM
30 lines
795 B
LLVM
; RUN: llc -o - %s -mtriple=x86_64-windows-msvc | FileCheck %s --check-prefixes=CHECK,TRAP_AFTER_NORETURN
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; RUN: llc -o - %s -mtriple=x86_64-apple-darwin | FileCheck %s --check-prefixes=CHECK,NO_TRAP_AFTER_NORETURN
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; CHECK-LABEL: call_exit:
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; CHECK: callq {{_?}}exit
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; TRAP_AFTER_NORETURN: ud2
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; NO_TRAP_AFTER_NORETURN-NOT: ud2
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define i32 @call_exit() noreturn nounwind {
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tail call void @exit(i32 0)
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unreachable
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}
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; CHECK-LABEL: trap:
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; CHECK: ud2
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; TRAP_AFTER_NORETURN: ud2
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; NO_TRAP_AFTER_NORETURN-NOT: ud2
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define i32 @trap() noreturn nounwind {
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tail call void @llvm.trap()
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unreachable
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}
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; CHECK-LABEL: unreachable:
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; CHECK: ud2
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define i32 @unreachable() noreturn nounwind {
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unreachable
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}
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declare void @llvm.trap() nounwind noreturn
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declare void @exit(i32 %rc) nounwind noreturn
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