================
@@ -18,6 +18,6 @@
.globl _start
_start:
.data
- .word foo@PLT - .
- .word foo@PLT - . + 1
- .word foo@PLT - . - 1
+ .word %plt(foo - .)
----------------
MaskRay wrote:
The IR doesn't model the current location (DOT). Instead, It computes
`SymA-SymB+offset`.
`SymB` might not be the current location, but it and the current location must
be in the same section.
Let's use `llvm/test/CodeGen/X86/x86-64-plt-relative-reloc.ll` (legacy; but
slightly better than `dso_local_equivalent.ll`):
```
@vtable = constant [5 x i32] [i32 0,
i32 trunc (i64 sub (i64 ptrtoint (ptr @fn1 to i64), i64 ptrtoint (ptr
getelementptr ([5 x i32], ptr @vtable, i32 0, i32 1) to i64)) to i32),
i32 trunc (i64 sub (i64 ptrtoint (ptr @fn2 to i64), i64 ptrtoint (ptr
getelementptr ([5 x i32], ptr @vtable, i32 0, i32 1) to i64)) to i32),
i32 trunc (i64 sub (i64 ptrtoint (ptr @fn3 to i64), i64 ptrtoint (ptr
getelementptr ([5 x i32], ptr @vtable, i32 0, i32 1) to i64)) to i32),
i32 trunc (i64 sub (i64 ptrtoint (ptr @global4 to i64), i64 ptrtoint (ptr
getelementptr ([5 x i32], ptr @vtable, i32 0, i32 1) to i64)) to i32)
]
```
If we need to emit `%pltpcrel`, we will have to change
`AsmPrinter::lowerConstant` to know the base GlobalVariable, which might be
possible...
https://github.com/llvm/llvm-project/pull/132569
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