`inteldialect` does not handle labels `0:` or `1:` on `x86`

[tgross35]

The below code:

define void @demo() {
start:
  call void asm inteldialect "0: jmp 0b", ""()
  ret void
}

Should build. Instead, it provides an inaccurate error message:

<inline asm>:2:5: error: invalid operand for instruction
        0: jmp 0b
           ^
Compiler returned: 1

This only happens on x86 and x86_64, other platforms seem not to be affected. This looks like another case of #35492, cc @rnk who authored 953bdce.

Link: https://llvm.godbolt.org/z/WWvWMzznK
Original repro: https://rust.godbolt.org/z/qP3Kd3Ts7

[tgross35]

This reproduces in clang too with -masm=intel https://llvm.godbolt.org/z/5Gz6hnqxs

[llvmbot]

@llvm/issue-subscribers-backend-x86

Author: Trevor Gross (tgross35)

The below code:

define void @<!-- -->demo() {
start:
  call void asm inteldialect "0: jmp 0b", ""()
  ret void
}

Should build. Instead, it provides an inaccurate error message:

<inline asm>:2:5: error: invalid operand for instruction
        0: jmp 0b
           ^
Compiler returned: 1

This only happens on x86 and x86_64, other platforms seem not to be affected. This looks like another case of #35492, cc @rnk who authored 953bdce.

Link: https://llvm.godbolt.org/z/WWvWMzznK
Original repro: https://rust.godbolt.org/z/qP3Kd3Ts7