https://bugs.llvm.org/show_bug.cgi?id=48577
Bug ID: 48577
Summary: [InstCombine] non-inbounds GEP of null pointer
miscompiled
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: Scalar Optimizations
Assignee: unassignedb...@nondot.org
Reporter: nikita....@gmail.com
CC: llvm-bugs@lists.llvm.org
https://llvm.godbolt.org/z/qec9oz
define i8 @test(i8* %p) {
%i = ptrtoint i8* %p to i64
%g = getelementptr i8, i8* null, i64 %i
%v = load i8, i8* %g, align 1
ret i8 %v
}
; RUN: opt -S -instcombine < %s
define i8 @test(i8* %p) {
store i8 undef, i8* null, align 536870912
ret i8 undef
}
As the GEP is not inbounds, the original code should be well-defined.
Rust bug report: https://github.com/rust-lang/rust/issues/80309
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