llvm-project/llvm/test/CodeGen/X86/ptrtoint-narrow.ll

; RUN: llc < %s -mtriple=x86_64-unknown-linux-gnu | FileCheck %s

@ptr = external global i8, align 1
@ref = constant i32 ptrtoint (i8* @ptr to i32), align 4

; CHECK: .long  ptr{{$}}
[AsmPrinter] Treat a narrowing PtrToInt like Trunc When printing assembly for PtrToInt, AsmPrinter::lowerConstant incorrectly assumed that if PtrToInt was not converting to an int with exactly the same number of bits, it must be widening to a larger int. But this isn't necessarily true; PtrToInt can also shrink the size, which is useful when you want to produce a known 32-bit pointer on a 64-bit platform (on x86_64 ELF this yields a R_X86_64_32 relocation). The old behavior of falling through to the widening case for a narrowing PtrToInt yields bogus assembly code like this, which fails to assemble because the no-op bit and it accidentally creates is not a valid relocation: ``` .long a&-1 ``` The fix is to treat a narrowing PtrToInt exactly the same as it already treats Trunc: just emit the expression and let the assembler deal with truncating it in the appropriate way. Patch by Mat Hostetter <mjh@fb.com>. Differential Revision: https://reviews.llvm.org/D61325 llvm-svn: 361508 2019-05-24 00:29:09 +08:00			`; RUN: llc < %s -mtriple=x86_64-unknown-linux-gnu \| FileCheck %s`

			`@ptr = external global i8, align 1`
			`@ref = constant i32 ptrtoint (i8* @ptr to i32), align 4`

			`; CHECK: .long ptr{{$}}`