issue with aligned pointers

[regehr]

here's a case that might be interesting, I'm not sure what's really going on.
here's the original IR and also what I want to lift it to:

target datalayout = "e-m:o-i64:64-i128:128-n32:64-S128"
target triple = "arm64-apple-macosx14.0.0"

define ptr @src(ptr align 8 %this) {
  %ret = load ptr, ptr %this, align 8
  ret ptr %ret
}

define ptr @tgt(ptr align 8 %0) {
  %x = load i64, ptr %0, align 8
  %ret = inttoptr i64 %x to ptr
  ret ptr %ret
}

this gives me an UB triggered. however, it works if I change everything to align 1, and it also works (at align 8) if I change the thing being loaded to a non-ptr type, like i64.

I don't think there's anything I can do on the tgt side to work around this

regehr@john-home:~/alive2-regehr/build$ ./alive-tv ~/foo.ll --disable-poison-input --disable-undef-input --tgt-is-asm

----------------------------------------
define ptr @src(ptr align(8) %this) {
#0:
  %ret = load ptr, ptr align(8) %this, align 8
  ret ptr %ret
}
=>
define ptr @tgt(ptr align(8) %#0) asm {
#1:
  %x = load i64, ptr align(8) %#0, align 8
  %ret = int2ptr i64 %x to ptr
  ret ptr %ret
}
Transformation doesn't verify!

ERROR: Source is more defined than target

Example:
ptr align(8) %this = pointer(non-local, block_id=1, offset=0)

Source:
ptr %ret = poison

SOURCE MEMORY STATE
===================
NON-LOCAL BLOCKS:
Block 0 >	size: 0	align: 8	alloc type: 0	alive: false	address: 0
Block 1 >	size: 8	align: 1	alloc type: 0	alive: true	address: 8
Contents:
*: #xc000000000000000

Block 2 >	size: 2	align: 1	alloc type: 0	alive: true	address: 1
Contents:
*: #x0000000000000000


Target:
i64 %x = #xc000000000000000 (13835058055282163712, -4611686018427387904)
ptr %ret = UB triggered!


regehr@john-home:~/alive2-regehr/build$