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6b73c7cf07
Summary: FEntryInserter pass unconditionally derefs the first Instruction in the first Basic Block. The pass crashes when the first BasicBlock is empty. Fix the crash by not dereferencing the basic Block iterator. This fixes an issue observed when building Linux kernel 4.4 with clang. Fixes PR33971. Reviewers: hfinkel, niravd, dblaikie Reviewed By: niravd Subscribers: davide, llvm-commits Differential Revision: https://reviews.llvm.org/D35979 llvm-svn: 309694
31 lines
704 B
LLVM
31 lines
704 B
LLVM
; RUN: llc %s -o - | FileCheck %s
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux-gnu"
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define void @test1() #0 {
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entry:
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ret void
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; CHECK-LABEL: @test1
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; CHECK: callq __fentry__
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; CHECK-NOT: mcount
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; CHECK: retq
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}
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define void @test2() #1 {
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entry:
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br label %bb1
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bb1:
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call void @address_taken(i64 ptrtoint (i8* blockaddress(@test2, %bb1) to i64), i32 512)
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ret void
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; CHECK-LABEL: @test2
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; CHECK: callq __fentry__
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; CHECK-NOT: mcount
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; CHECK: retq
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}
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declare void @address_taken(i64, i32) local_unnamed_addr
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attributes #0 = { "fentry-call"="true" }
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attributes #1 = { inlinehint minsize noredzone nounwind optsize sspstrong "fentry-call"="true" }
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