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f4ae71aa6d
Summary: This fixes PR43081, where the transformation of `strchr(p, 0) -> p + strlen(p)` can cause a segfault, if `-fno-builtin-strlen` is used. In that case, `emitStrLen` returns nullptr, which CreateGEP is not designed to handle. Also add the minimized code from the PR as a test case. Reviewers: xbolva00, spatel, jdoerfert, efriedma Reviewed By: efriedma Subscribers: lebedev.ri, hiraditya, cfe-commits, llvm-commits Tags: #clang, #llvm Differential Revision: https://reviews.llvm.org/D70143
16 lines
504 B
LLVM
16 lines
504 B
LLVM
; RUN: opt < %s -instcombine -disable-builtin strlen -S | FileCheck %s
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target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
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declare i8* @strchr(i8*, i32)
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define i8* @pr43081(i8* %a) {
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entry:
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%a.addr = alloca i8*, align 8
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store i8* %a, i8** %a.addr, align 8
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%0 = load i8*, i8** %a.addr, align 8
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%call = call i8* @strchr(i8* %0, i32 0)
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ret i8* %call
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; CHECK: call i8* @strchr
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}
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