<inline asm>:5:10: error: ambiguous operand size for instruction 'pop'

[lhmouse]

(https://gcc.godbolt.org/z/cv8a5hfa6)

  xor esi, esi
  push gs:[rsi]    ; push QWORD PTR gs:[0]
  pop gs:[rsi]     ; pop QWORD PTR gs:[0]

On x86-64 both the push and pop instructions take only 64-bit operands, so there's no ambiguity.

It also seems inconsistent that push is unaffected.

[llvmbot]

@llvm/issue-subscribers-backend-x86

Author: LIU Hao (lhmouse)

(https://gcc.godbolt.org/z/cv8a5hfa6) ```asm xor esi, esi push gs:[rsi] ; push QWORD PTR gs:[0] pop gs:[rsi] ; pop QWORD PTR gs:[0] ```

On x86-64 both the push and pop instructions take only 64-bit operands, so there's no ambiguity.

It also seems inconsistent that push is unaffected.