Backport #145690, #146068 and #144058 #182
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…es (llvm#145648) A case found from rust-lang/rust#142752: https://llvm.godbolt.org/z/T7ce9saWh. We should emit `@bar_0` for the following code: ```llvm target triple = "x86_64-unknown-linux-gnu" @rel_0 = private unnamed_addr constant [1 x i32] [ i32 trunc (i64 sub (i64 ptrtoint (ptr @bar_0 to i64), i64 ptrtoint (ptr @rel_0 to i64)) to i32)] @bar_0 = internal unnamed_addr constant ptr @foo_0, align 8 @foo_0 = external global ptr, align 8 define void @foo(ptr %arg0) { store ptr @bar_0, ptr %arg0, align 8 ret void } ``` (cherry picked from commit 630d55c)
…id generating GOTPCREL relocations (llvm#146068) The entry in a relative lookup table is a global variable with a constant offset, such as `@gv`, `GEP @gv, 1`, and so on. We cannot only consider the case of a trivial global variable. This PR handles all cases using the existing `IsConstantOffsetFromGlobal` function. (cherry picked from commit c43282a)
…m#144058) Code originally added in llvm#120995 and later corrected in llvm#130517 but apparently still not correct according to llvm#141494 and rust-lang/rust#141913. Revert the special handling because the test written in llvm#120995 and llvm#130517 still passes without those changes. Kept the test and improved it with a `__DATA` section to keep the current behaviour checked in case other changes modify the behaviour and break this edge case. (cherry picked from commit a0662ce)
dianqk
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I assume that LLVM 20.1.7 is the final version.
I will use
git merge --ff-onlyto merge this.