| # RUN: llvm-mc -mcpu=skylake -filetype=obj -triple x86_64-pc-linux-gnu %s -x86-pad-max-prefix-size=1 --x86-align-branch-boundary=32 --x86-align-branch=jmp+indirect | llvm-objdump -d - | FileCheck %s |
| # RUN: llvm-mc -mcpu=skylake -filetype=obj -triple x86_64-pc-linux-gnu %s --mc-relax-all | llvm-objdump -d - | FileCheck --check-prefixes=RELAX-ALL %s |
| |
| # Exercise cases where we are allowed to increase the length of unrelaxable |
| # instructions (by adding prefixes) for alignment purposes. |
| |
| # The first test checks instructions 'int3', 'push %rbp', which will be padded |
| # later are unrelaxable (their encoding size is still 1 byte when |
| # --mc-relax-all is passed). |
| .text |
| .globl labeled_unrelaxable_test |
| labeled_unrelaxable_test: |
| # RELAX-ALL: 0: cc int3 |
| # RELAX-ALL: 1: 54 pushq %rsp |
| int3 |
| push %rsp |
| |
| # The second test is a basic test, we just check the jmp is aligned by prefix |
| # padding the previous instructions. |
| .text |
| .globl labeled_basic_test |
| labeled_basic_test: |
| .p2align 5 |
| .rept 28 |
| int3 |
| .endr |
| # CHECK: 3c: 2e cc int3 |
| # CHECK: 3e: 2e 54 pushq %rsp |
| # CHECK: 40: eb 00 jmp |
| int3 |
| push %rsp |
| jmp foo |
| foo: |
| ret |
| |
| # The third test check the correctness cornercase - can't add prefixes on a |
| # prefix or a instruction following by a prefix. |
| .globl labeled_prefix_test |
| labeled_prefix_test: |
| .p2align 5 |
| .rept 28 |
| int3 |
| .endr |
| # CHECK: 7c: 2e cc int3 |
| int3 |
| # CHECK: 7e: 3e cc int3 |
| DS |
| int3 |
| # CHECK: 80: eb 00 jmp |
| jmp bar |
| bar: |
| ret |
