powerpc64-ibm-aix: fix cfg(target_abi) value

[RalfJung]

We don't actually use the ExtAbi currently, see #153784. So fix the value of cfg(target_abi) to match reality.

Cc @Gelbpunkt @daltenty @gilamn5tr @amy-kwan

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[Gelbpunkt]

Makes sense, thanks for fixing this in the target spec!

[RalfJung]

I do wonder why this was added in #102293 with an "extabi" value here... Cc @ecnelises in case you still remember.

[ecnelises]

Without vec-extabi, v20-v31 cannot be used, so in most projects Clang enables this option. To align with it, we also enabled it by default. Maybe the IBM folks can explain it in more detail...

[RalfJung]

To align with it, we also enabled it by default.

You didn't, though? You set cfg(target_abi) to this value but on its own that does nothing (other than change cfg checks in Rust). You didn't actually configure LLVM to use that ABI. Or am I missing something?

Some inline asm tests are failing now though. I'm a bit surprised b y that -- whether functions can use registers internally and whether the ABI uses them are usually separate questions, aren't they?

[rust-log-analyzer]

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Executing "/scripts/stage_2_test_set1.sh"
+ /scripts/stage_2_test_set1.sh
PR_CI_JOB set; skipping tidy
+ '[' 1 == 1 ']'
+ echo 'PR_CI_JOB set; skipping tidy'
+ SKIP_TIDY='--skip tidy'
+ ../x.py --stage 2 test --skip tidy --skip compiler --skip src
##[group]Building bootstrap
    Finished `dev` profile [unoptimized] target(s) in 0.04s
##[endgroup]
downloading https://static.rust-lang.org/dist/2026-03-05/rustfmt-nightly-aarch64-unknown-linux-gnu.tar.xz
---

failures:

---- [ui] tests/ui/asm/powerpc/bad-reg.rs#aix64 stdout ----
Saved the actual stderr to `/checkout/obj/build/aarch64-unknown-linux-gnu/test/ui/asm/powerpc/bad-reg.aix64/bad-reg.aix64.stderr`
diff of stderr:

736    |
737    = note: register class `vreg` supports these types: i8x16, i16x8, i32x4, f32x4, f32, f64, i64x2, f64x2
738 
+ error: cannot use register `v20`: v20-v31 (vs52-vs63) are reserved on vec-default ABI
+   --> $DIR/bad-reg.rs:82:18
+    |
+ LL |         asm!("", out("v20") _);
+    |                  ^^^^^^^^^^^^
+ 
+ error: cannot use register `v21`: v20-v31 (vs52-vs63) are reserved on vec-default ABI
+   --> $DIR/bad-reg.rs:83:18
+    |
+ LL |         asm!("", out("v21") _);
+    |                  ^^^^^^^^^^^^
+ 
+ error: cannot use register `v22`: v20-v31 (vs52-vs63) are reserved on vec-default ABI
+   --> $DIR/bad-reg.rs:84:18
+    |
+ LL |         asm!("", out("v22") _);
+    |                  ^^^^^^^^^^^^
+ 
+ error: cannot use register `v23`: v20-v31 (vs52-vs63) are reserved on vec-default ABI
+   --> $DIR/bad-reg.rs:85:18
+    |
+ LL |         asm!("", out("v23") _);
+    |                  ^^^^^^^^^^^^
+ 
+ error: cannot use register `v24`: v20-v31 (vs52-vs63) are reserved on vec-default ABI
+   --> $DIR/bad-reg.rs:86:18
+    |
+ LL |         asm!("", out("v24") _);
+    |                  ^^^^^^^^^^^^
+ 
+ error: cannot use register `v25`: v20-v31 (vs52-vs63) are reserved on vec-default ABI
+   --> $DIR/bad-reg.rs:87:18
+    |
+ LL |         asm!("", out("v25") _);
+    |                  ^^^^^^^^^^^^
+ 
+ error: cannot use register `v26`: v20-v31 (vs52-vs63) are reserved on vec-default ABI
+   --> $DIR/bad-reg.rs:88:18
+    |
+ LL |         asm!("", out("v26") _);
+    |                  ^^^^^^^^^^^^
+ 
+ error: cannot use register `v27`: v20-v31 (vs52-vs63) are reserved on vec-default ABI
+   --> $DIR/bad-reg.rs:89:18
+    |
+ LL |         asm!("", out("v27") _);
+    |                  ^^^^^^^^^^^^
+ 
+ error: cannot use register `v28`: v20-v31 (vs52-vs63) are reserved on vec-default ABI
+   --> $DIR/bad-reg.rs:90:18
+    |
+ LL |         asm!("", out("v28") _);
+    |                  ^^^^^^^^^^^^
+ 
+ error: cannot use register `v29`: v20-v31 (vs52-vs63) are reserved on vec-default ABI
+   --> $DIR/bad-reg.rs:91:18
+    |
+ LL |         asm!("", out("v29") _);
+    |                  ^^^^^^^^^^^^
+ 
+ error: cannot use register `v30`: v20-v31 (vs52-vs63) are reserved on vec-default ABI
+   --> $DIR/bad-reg.rs:92:18
+    |
+ LL |         asm!("", out("v30") _);
+    |                  ^^^^^^^^^^^^
+ 
+ error: cannot use register `v31`: v20-v31 (vs52-vs63) are reserved on vec-default ABI
+   --> $DIR/bad-reg.rs:93:18
+    |
+ LL |         asm!("", out("v31") _);
+    |                  ^^^^^^^^^^^^
+ 
739 error: type `i32` cannot be used with this register class
740   --> $DIR/bad-reg.rs:106:28
741    |

760    |
761    = note: register class `vsreg` supports these types: f32, f64, i8x16, i16x8, i32x4, i64x2, f32x4, f64x2
762 
+ error: cannot use register `vs52`: v20-v31 (vs52-vs63) are reserved on vec-default ABI
+   --> $DIR/bad-reg.rs:123:18
+    |
+ LL |         asm!("", out("vs52") _);
+    |                  ^^^^^^^^^^^^^
+ 
+ error: cannot use register `vs53`: v20-v31 (vs52-vs63) are reserved on vec-default ABI
+   --> $DIR/bad-reg.rs:124:18
+    |
+ LL |         asm!("", out("vs53") _);
+    |                  ^^^^^^^^^^^^^
+ 
+ error: cannot use register `vs54`: v20-v31 (vs52-vs63) are reserved on vec-default ABI
+   --> $DIR/bad-reg.rs:125:18
+    |
+ LL |         asm!("", out("vs54") _);
+    |                  ^^^^^^^^^^^^^
+ 
+ error: cannot use register `vs55`: v20-v31 (vs52-vs63) are reserved on vec-default ABI
+   --> $DIR/bad-reg.rs:126:18
+    |
+ LL |         asm!("", out("vs55") _);
+    |                  ^^^^^^^^^^^^^
+ 
+ error: cannot use register `vs56`: v20-v31 (vs52-vs63) are reserved on vec-default ABI
+   --> $DIR/bad-reg.rs:127:18
+    |
+ LL |         asm!("", out("vs56") _);
+    |                  ^^^^^^^^^^^^^
+ 
+ error: cannot use register `vs57`: v20-v31 (vs52-vs63) are reserved on vec-default ABI
+   --> $DIR/bad-reg.rs:128:18
+    |
+ LL |         asm!("", out("vs57") _);
+    |                  ^^^^^^^^^^^^^
+ 
+ error: cannot use register `vs58`: v20-v31 (vs52-vs63) are reserved on vec-default ABI
+   --> $DIR/bad-reg.rs:129:18
+    |
+ LL |         asm!("", out("vs58") _);
+    |                  ^^^^^^^^^^^^^
+ 
+ error: cannot use register `vs59`: v20-v31 (vs52-vs63) are reserved on vec-default ABI
+   --> $DIR/bad-reg.rs:130:18
+    |
+ LL |         asm!("", out("vs59") _);
+    |                  ^^^^^^^^^^^^^
+ 
+ error: cannot use register `vs60`: v20-v31 (vs52-vs63) are reserved on vec-default ABI
+   --> $DIR/bad-reg.rs:131:18
+    |
+ LL |         asm!("", out("vs60") _);
+    |                  ^^^^^^^^^^^^^
+ 
+ error: cannot use register `vs61`: v20-v31 (vs52-vs63) are reserved on vec-default ABI
+   --> $DIR/bad-reg.rs:132:18
+    |
+ LL |         asm!("", out("vs61") _);
+    |                  ^^^^^^^^^^^^^
+ 
+ error: cannot use register `vs62`: v20-v31 (vs52-vs63) are reserved on vec-default ABI
+   --> $DIR/bad-reg.rs:133:18
+    |
+ LL |         asm!("", out("vs62") _);
+    |                  ^^^^^^^^^^^^^
+ 
+ error: cannot use register `vs63`: v20-v31 (vs52-vs63) are reserved on vec-default ABI
+   --> $DIR/bad-reg.rs:134:18
+    |
+ LL |         asm!("", out("vs63") _);
+    |                  ^^^^^^^^^^^^^
+ 
763 error: type `i32` cannot be used with this register class
764   --> $DIR/bad-reg.rs:139:27
765    |

856    |
857    = note: register class `xer` supports these types: 
858 
+ error: cannot use register `vs52`: v20-v31 (vs52-vs63) are reserved on vec-default ABI
+   --> $DIR/bad-reg.rs:312:18
+    |
+ LL |         asm!("", out("vs52") _, out("v20") _);
+    |                  ^^^^^^^^^^^^^
+ 
+ error: cannot use register `v20`: v20-v31 (vs52-vs63) are reserved on vec-default ABI
+   --> $DIR/bad-reg.rs:312:33
+    |
+ LL |         asm!("", out("vs52") _, out("v20") _);
+    |                                 ^^^^^^^^^^^^
+ 
+ error: cannot use register `vs53`: v20-v31 (vs52-vs63) are reserved on vec-default ABI
+   --> $DIR/bad-reg.rs:314:18
+    |
+ LL |         asm!("", out("vs53") _, out("v21") _);
+    |                  ^^^^^^^^^^^^^
+ 
+ error: cannot use register `v21`: v20-v31 (vs52-vs63) are reserved on vec-default ABI
+   --> $DIR/bad-reg.rs:314:33
+    |
+ LL |         asm!("", out("vs53") _, out("v21") _);
+    |                                 ^^^^^^^^^^^^
+ 
+ error: cannot use register `vs54`: v20-v31 (vs52-vs63) are reserved on vec-default ABI
+   --> $DIR/bad-reg.rs:316:18
+    |
+ LL |         asm!("", out("vs54") _, out("v22") _);
+    |                  ^^^^^^^^^^^^^
+ 
+ error: cannot use register `v22`: v20-v31 (vs52-vs63) are reserved on vec-default ABI
+   --> $DIR/bad-reg.rs:316:33
+    |
+ LL |         asm!("", out("vs54") _, out("v22") _);
+    |                                 ^^^^^^^^^^^^
+ 
+ error: cannot use register `vs55`: v20-v31 (vs52-vs63) are reserved on vec-default ABI
+   --> $DIR/bad-reg.rs:318:18
+    |
+ LL |         asm!("", out("vs55") _, out("v23") _);
+    |                  ^^^^^^^^^^^^^
+ 
+ error: cannot use register `v23`: v20-v31 (vs52-vs63) are reserved on vec-default ABI
+   --> $DIR/bad-reg.rs:318:33
+    |
+ LL |         asm!("", out("vs55") _, out("v23") _);
+    |                                 ^^^^^^^^^^^^
+ 
+ error: cannot use register `vs56`: v20-v31 (vs52-vs63) are reserved on vec-default ABI
+   --> $DIR/bad-reg.rs:320:18
+    |
+ LL |         asm!("", out("vs56") _, out("v24") _);
+    |                  ^^^^^^^^^^^^^
+ 
+ error: cannot use register `v24`: v20-v31 (vs52-vs63) are reserved on vec-default ABI
+   --> $DIR/bad-reg.rs:320:33
+    |
+ LL |         asm!("", out("vs56") _, out("v24") _);
+    |                                 ^^^^^^^^^^^^
+ 
+ error: cannot use register `vs57`: v20-v31 (vs52-vs63) are reserved on vec-default ABI
+   --> $DIR/bad-reg.rs:322:18
+    |
+ LL |         asm!("", out("vs57") _, out("v25") _);
+    |                  ^^^^^^^^^^^^^
+ 
+ error: cannot use register `v25`: v20-v31 (vs52-vs63) are reserved on vec-default ABI
+   --> $DIR/bad-reg.rs:322:33
+    |
+ LL |         asm!("", out("vs57") _, out("v25") _);
+    |                                 ^^^^^^^^^^^^
+ 
+ error: cannot use register `vs58`: v20-v31 (vs52-vs63) are reserved on vec-default ABI
+   --> $DIR/bad-reg.rs:324:18
+    |
+ LL |         asm!("", out("vs58") _, out("v26") _);
+    |                  ^^^^^^^^^^^^^
+ 
+ error: cannot use register `v26`: v20-v31 (vs52-vs63) are reserved on vec-default ABI
+   --> $DIR/bad-reg.rs:324:33
+    |
+ LL |         asm!("", out("vs58") _, out("v26") _);
+    |                                 ^^^^^^^^^^^^
+ 
+ error: cannot use register `vs59`: v20-v31 (vs52-vs63) are reserved on vec-default ABI
+   --> $DIR/bad-reg.rs:326:18
+    |
+ LL |         asm!("", out("vs59") _, out("v27") _);
+    |                  ^^^^^^^^^^^^^
+ 
+ error: cannot use register `v27`: v20-v31 (vs52-vs63) are reserved on vec-default ABI
+   --> $DIR/bad-reg.rs:326:33
+    |
+ LL |         asm!("", out("vs59") _, out("v27") _);
+    |                                 ^^^^^^^^^^^^
+ 
+ error: cannot use register `vs60`: v20-v31 (vs52-vs63) are reserved on vec-default ABI
+   --> $DIR/bad-reg.rs:328:18
+    |
+ LL |         asm!("", out("vs60") _, out("v28") _);
+    |                  ^^^^^^^^^^^^^
+ 
+ error: cannot use register `v28`: v20-v31 (vs52-vs63) are reserved on vec-default ABI
+   --> $DIR/bad-reg.rs:328:33
+    |
+ LL |         asm!("", out("vs60") _, out("v28") _);
+    |                                 ^^^^^^^^^^^^
+ 
+ error: cannot use register `vs61`: v20-v31 (vs52-vs63) are reserved on vec-default ABI
+   --> $DIR/bad-reg.rs:330:18
+    |
+ LL |         asm!("", out("vs61") _, out("v29") _);
+    |                  ^^^^^^^^^^^^^
+ 
+ error: cannot use register `v29`: v20-v31 (vs52-vs63) are reserved on vec-default ABI
+   --> $DIR/bad-reg.rs:330:33
+    |
+ LL |         asm!("", out("vs61") _, out("v29") _);
+    |                                 ^^^^^^^^^^^^
+ 
+ error: cannot use register `vs62`: v20-v31 (vs52-vs63) are reserved on vec-default ABI
+   --> $DIR/bad-reg.rs:332:18
+    |
+ LL |         asm!("", out("vs62") _, out("v30") _);
+    |                  ^^^^^^^^^^^^^
+ 
+ error: cannot use register `v30`: v20-v31 (vs52-vs63) are reserved on vec-default ABI
+   --> $DIR/bad-reg.rs:332:33
+    |
+ LL |         asm!("", out("vs62") _, out("v30") _);
+    |                                 ^^^^^^^^^^^^
+ 
+ error: cannot use register `vs63`: v20-v31 (vs52-vs63) are reserved on vec-default ABI
+   --> $DIR/bad-reg.rs:334:18
+    |
+ LL |         asm!("", out("vs63") _, out("v31") _);
+    |                  ^^^^^^^^^^^^^
+ 
+ error: cannot use register `v31`: v20-v31 (vs52-vs63) are reserved on vec-default ABI
+   --> $DIR/bad-reg.rs:334:33
+    |
+ LL |         asm!("", out("vs63") _, out("v31") _);
+    |                                 ^^^^^^^^^^^^
+ 
859 error: cannot use register `spe_acc`: spe_acc is only available on spe targets
860   --> $DIR/bad-reg.rs:338:18
861    |

862 LL |         asm!("", out("spe_acc") _);
863    |                  ^^^^^^^^^^^^^^^^
864 
- error: aborting due to 114 previous errors
+ error: aborting due to 162 previous errors
866 
---
-   --> /checkout/tests/ui/asm/powerpc/bad-reg.rs:332:18
-   --> /checkout/tests/ui/asm/powerpc/bad-reg.rs:332:33
-   --> /checkout/tests/ui/asm/powerpc/bad-reg.rs:334:18
-   --> /checkout/tests/ui/asm/powerpc/bad-reg.rs:334:33
+ error: cannot use register `v20`: v20-v31 (vs52-vs63) are reserved on vec-default ABI
+   --> $DIR/bad-reg.rs:82:18
+    |
+ LL |         asm!("", out("v20") _);
+    |                  ^^^^^^^^^^^^
+ 
+ error: cannot use register `v21`: v20-v31 (vs52-vs63) are reserved on vec-default ABI
+   --> $DIR/bad-reg.rs:83:18
+    |
+ LL |         asm!("", out("v21") _);
+    |                  ^^^^^^^^^^^^
+ 
+ error: cannot use register `v22`: v20-v31 (vs52-vs63) are reserved on vec-default ABI
+   --> $DIR/bad-reg.rs:84:18
+    |
+ LL |         asm!("", out("v22") _);
+    |                  ^^^^^^^^^^^^
+ 
+ error: cannot use register `v23`: v20-v31 (vs52-vs63) are reserved on vec-default ABI
+   --> $DIR/bad-reg.rs:85:18
+    |
+ LL |         asm!("", out("v23") _);
+    |                  ^^^^^^^^^^^^
+ 
+ error: cannot use register `v24`: v20-v31 (vs52-vs63) are reserved on vec-default ABI
+   --> $DIR/bad-reg.rs:86:18
+    |
+ LL |         asm!("", out("v24") _);
+    |                  ^^^^^^^^^^^^
+ 
+ error: cannot use register `v25`: v20-v31 (vs52-vs63) are reserved on vec-default ABI
+   --> $DIR/bad-reg.rs:87:18
+    |
+ LL |         asm!("", out("v25") _);
+    |                  ^^^^^^^^^^^^
+ 
+ error: cannot use register `v26`: v20-v31 (vs52-vs63) are reserved on vec-default ABI
+   --> $DIR/bad-reg.rs:88:18
+    |
+ LL |         asm!("", out("v26") _);
+    |                  ^^^^^^^^^^^^
+ 
+ error: cannot use register `v27`: v20-v31 (vs52-vs63) are reserved on vec-default ABI
+   --> $DIR/bad-reg.rs:89:18
+    |
+ LL |         asm!("", out("v27") _);
+    |                  ^^^^^^^^^^^^
+ 
+ error: cannot use register `v28`: v20-v31 (vs52-vs63) are reserved on vec-default ABI
+   --> $DIR/bad-reg.rs:90:18
+    |
+ LL |         asm!("", out("v28") _);
+    |                  ^^^^^^^^^^^^
+ 
+ error: cannot use register `v29`: v20-v31 (vs52-vs63) are reserved on vec-default ABI
+   --> $DIR/bad-reg.rs:91:18
+    |
+ LL |         asm!("", out("v29") _);
+    |                  ^^^^^^^^^^^^
+ 
+ error: cannot use register `v30`: v20-v31 (vs52-vs63) are reserved on vec-default ABI
+   --> $DIR/bad-reg.rs:92:18
+    |
+ LL |         asm!("", out("v30") _);
+    |                  ^^^^^^^^^^^^
+ 
+ error: cannot use register `v31`: v20-v31 (vs52-vs63) are reserved on vec-default ABI
+   --> $DIR/bad-reg.rs:93:18
+    |
+ LL |         asm!("", out("v31") _);
+    |                  ^^^^^^^^^^^^
+ 
+ error: cannot use register `vs52`: v20-v31 (vs52-vs63) are reserved on vec-default ABI
+   --> $DIR/bad-reg.rs:123:18
+    |
+ LL |         asm!("", out("vs52") _);
+    |                  ^^^^^^^^^^^^^
+ 
+ error: cannot use register `vs53`: v20-v31 (vs52-vs63) are reserved on vec-default ABI
+   --> $DIR/bad-reg.rs:124:18
+    |
+ LL |         asm!("", out("vs53") _);
+    |                  ^^^^^^^^^^^^^
+ 
+ error: cannot use register `vs54`: v20-v31 (vs52-vs63) are reserved on vec-default ABI
+   --> $DIR/bad-reg.rs:125:18
+    |
+ LL |         asm!("", out("vs54") _);
+    |                  ^^^^^^^^^^^^^
+ 
+ error: cannot use register `vs55`: v20-v31 (vs52-vs63) are reserved on vec-default ABI
+   --> $DIR/bad-reg.rs:126:18
+    |
+ LL |         asm!("", out("vs55") _);
+    |                  ^^^^^^^^^^^^^
+ 
+ error: cannot use register `vs56`: v20-v31 (vs52-vs63) are reserved on vec-default ABI
+   --> $DIR/bad-reg.rs:127:18
+    |
+ LL |         asm!("", out("vs56") _);
+    |                  ^^^^^^^^^^^^^
+ 
+ error: cannot use register `vs57`: v20-v31 (vs52-vs63) are reserved on vec-default ABI
+   --> $DIR/bad-reg.rs:128:18
+    |
+ LL |         asm!("", out("vs57") _);
+    |                  ^^^^^^^^^^^^^
+ 
+ error: cannot use register `vs58`: v20-v31 (vs52-vs63) are reserved on vec-default ABI
+   --> $DIR/bad-reg.rs:129:18
+    |
+ LL |         asm!("", out("vs58") _);
+    |                  ^^^^^^^^^^^^^
+ 
+ error: cannot use register `vs59`: v20-v31 (vs52-vs63) are reserved on vec-default ABI
+   --> $DIR/bad-reg.rs:130:18
+    |
+ LL |         asm!("", out("vs59") _);
+    |                  ^^^^^^^^^^^^^
+ 
+ error: cannot use register `vs60`: v20-v31 (vs52-vs63) are reserved on vec-default ABI
+   --> $DIR/bad-reg.rs:131:18
+    |
+ LL |         asm!("", out("vs60") _);
+    |                  ^^^^^^^^^^^^^
+ 
+ error: cannot use register `vs61`: v20-v31 (vs52-vs63) are reserved on vec-default ABI
+   --> $DIR/bad-reg.rs:132:18
+    |
+ LL |         asm!("", out("vs61") _);
+    |                  ^^^^^^^^^^^^^
+ 
+ error: cannot use register `vs62`: v20-v31 (vs52-vs63) are reserved on vec-default ABI
+   --> $DIR/bad-reg.rs:133:18
+    |
+ LL |         asm!("", out("vs62") _);
+    |                  ^^^^^^^^^^^^^
+ 
+ error: cannot use register `vs63`: v20-v31 (vs52-vs63) are reserved on vec-default ABI
+   --> $DIR/bad-reg.rs:134:18
+    |
+ LL |         asm!("", out("vs63") _);
+    |                  ^^^^^^^^^^^^^
+ 
+ error: cannot use register `vs52`: v20-v31 (vs52-vs63) are reserved on vec-default ABI
+   --> $DIR/bad-reg.rs:312:18
+    |
+ LL |         asm!("", out("vs52") _, out("v20") _);
+    |                  ^^^^^^^^^^^^^
+ 
+ error: cannot use register `v20`: v20-v31 (vs52-vs63) are reserved on vec-default ABI
+   --> $DIR/bad-reg.rs:312:33
+    |
+ LL |         asm!("", out("vs52") _, out("v20") _);
+    |                                 ^^^^^^^^^^^^
+ 
+ error: cannot use register `vs53`: v20-v31 (vs52-vs63) are reserved on vec-default ABI
+   --> $DIR/bad-reg.rs:314:18
+    |
+ LL |         asm!("", out("vs53") _, out("v21") _);
+    |                  ^^^^^^^^^^^^^
+ 
+ error: cannot use register `v21`: v20-v31 (vs52-vs63) are reserved on vec-default ABI
+   --> $DIR/bad-reg.rs:314:33
+    |
+ LL |         asm!("", out("vs53") _, out("v21") _);
+    |                                 ^^^^^^^^^^^^
+ 
+ error: cannot use register `vs54`: v20-v31 (vs52-vs63) are reserved on vec-default ABI
+   --> $DIR/bad-reg.rs:316:18
+    |
+ LL |         asm!("", out("vs54") _, out("v22") _);
+    |                  ^^^^^^^^^^^^^
+ 
+ error: cannot use register `v22`: v20-v31 (vs52-vs63) are reserved on vec-default ABI
+   --> $DIR/bad-reg.rs:316:33
+    |
+ LL |         asm!("", out("vs54") _, out("v22") _);
+    |                                 ^^^^^^^^^^^^
+ 
+ error: cannot use register `vs55`: v20-v31 (vs52-vs63) are reserved on vec-default ABI
+   --> $DIR/bad-reg.rs:318:18
+    |
+ LL |         asm!("", out("vs55") _, out("v23") _);
+    |                  ^^^^^^^^^^^^^
+ 
+ error: cannot use register `v23`: v20-v31 (vs52-vs63) are reserved on vec-default ABI
+   --> $DIR/bad-reg.rs:318:33
+    |
+ LL |         asm!("", out("vs55") _, out("v23") _);
+    |                                 ^^^^^^^^^^^^
+ 
+ error: cannot use register `vs56`: v20-v31 (vs52-vs63) are reserved on vec-default ABI
+   --> $DIR/bad-reg.rs:320:18
+    |
+ LL |         asm!("", out("vs56") _, out("v24") _);
+    |                  ^^^^^^^^^^^^^
+ 
+ error: cannot use register `v24`: v20-v31 (vs52-vs63) are reserved on vec-default ABI
+   --> $DIR/bad-reg.rs:320:33
+    |
+ LL |         asm!("", out("vs56") _, out("v24") _);
+    |                                 ^^^^^^^^^^^^
+ 
+ error: cannot use register `vs57`: v20-v31 (vs52-vs63) are reserved on vec-default ABI
+   --> $DIR/bad-reg.rs:322:18
+    |
+ LL |         asm!("", out("vs57") _, out("v25") _);
+    |                  ^^^^^^^^^^^^^
+ 
+ error: cannot use register `v25`: v20-v31 (vs52-vs63) are reserved on vec-default ABI
+   --> $DIR/bad-reg.rs:322:33
+    |
+ LL |         asm!("", out("vs57") _, out("v25") _);
+    |                                 ^^^^^^^^^^^^
+ 
+ error: cannot use register `vs58`: v20-v31 (vs52-vs63) are reserved on vec-default ABI
+   --> $DIR/bad-reg.rs:324:18
+    |
+ LL |         asm!("", out("vs58") _, out("v26") _);
+    |                  ^^^^^^^^^^^^^
+ 
+ error: cannot use register `v26`: v20-v31 (vs52-vs63) are reserved on vec-default ABI
+   --> $DIR/bad-reg.rs:324:33
+    |
+ LL |         asm!("", out("vs58") _, out("v26") _);
+    |                                 ^^^^^^^^^^^^
+ 
+ error: cannot use register `vs59`: v20-v31 (vs52-vs63) are reserved on vec-default ABI
+   --> $DIR/bad-reg.rs:326:18
+    |
+ LL |         asm!("", out("vs59") _, out("v27") _);
+    |                  ^^^^^^^^^^^^^
+ 
+ error: cannot use register `v27`: v20-v31 (vs52-vs63) are reserved on vec-default ABI
+   --> $DIR/bad-reg.rs:326:33
+    |
+ LL |         asm!("", out("vs59") _, out("v27") _);
+    |                                 ^^^^^^^^^^^^
+ 
+ error: cannot use register `vs60`: v20-v31 (vs52-vs63) are reserved on vec-default ABI
+   --> $DIR/bad-reg.rs:328:18
+    |
+ LL |         asm!("", out("vs60") _, out("v28") _);
+    |                  ^^^^^^^^^^^^^
+ 
+ error: cannot use register `v28`: v20-v31 (vs52-vs63) are reserved on vec-default ABI
+   --> $DIR/bad-reg.rs:328:33
+    |
+ LL |         asm!("", out("vs60") _, out("v28") _);
+    |                                 ^^^^^^^^^^^^
+ 
+ error: cannot use register `vs61`: v20-v31 (vs52-vs63) are reserved on vec-default ABI
+   --> $DIR/bad-reg.rs:330:18
+    |
+ LL |         asm!("", out("vs61") _, out("v29") _);
+    |                  ^^^^^^^^^^^^^
+ 
+ error: cannot use register `v29`: v20-v31 (vs52-vs63) are reserved on vec-default ABI
+   --> $DIR/bad-reg.rs:330:33
+    |
+ LL |         asm!("", out("vs61") _, out("v29") _);
+    |                                 ^^^^^^^^^^^^
+ 
+ error: cannot use register `vs62`: v20-v31 (vs52-vs63) are reserved on vec-default ABI
+   --> $DIR/bad-reg.rs:332:18
+    |
+ LL |         asm!("", out("vs62") _, out("v30") _);
+    |                  ^^^^^^^^^^^^^
+ 
+ error: cannot use register `v30`: v20-v31 (vs52-vs63) are reserved on vec-default ABI
+   --> $DIR/bad-reg.rs:332:33
+    |
+ LL |         asm!("", out("vs62") _, out("v30") _);
+    |                                 ^^^^^^^^^^^^
+ 
+ error: cannot use register `vs63`: v20-v31 (vs52-vs63) are reserved on vec-default ABI
+   --> $DIR/bad-reg.rs:334:18
+    |
+ LL |         asm!("", out("vs63") _, out("v31") _);
+    |                  ^^^^^^^^^^^^^
+ 
+ error: cannot use register `v31`: v20-v31 (vs52-vs63) are reserved on vec-default ABI
+   --> $DIR/bad-reg.rs:334:33
+    |
+ LL |         asm!("", out("vs63") _, out("v31") _);
+    |                                 ^^^^^^^^^^^^
+ 
+ error: aborting due to 162 previous errors


The actual stderr differed from the expected stderr
To update references, rerun the tests and pass the `--bless` flag
To only update this specific test, also pass `--test-args asm/powerpc/bad-reg.rs`

error in revision `aix64`: 1 errors occurred comparing output.
status: exit status: 1
command: env -u RUSTC_LOG_COLOR RUSTC_ICE="0" RUST_BACKTRACE="short" "/checkout/obj/build/aarch64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/tests/ui/asm/powerpc/bad-reg.rs" "-Zthreads=1" "-Zsimulate-remapped-rust-src-base=/rustc/FAKE_PREFIX" "-Ztranslate-remapped-path-to-local-path=no" "-Z" "ignore-directory-in-diagnostics-source-blocks=/cargo" "-Z" "ignore-directory-in-diagnostics-source-blocks=/checkout/vendor" "--sysroot" "/checkout/obj/build/aarch64-unknown-linux-gnu/stage2" "--cfg" "aix64" "--check-cfg" "cfg(test,FALSE,powerpc,powerpc64,powerpc64le,aix64,powerpcspe)" "--error-format" "json" "--json" "future-incompat" "-Ccodegen-units=1" "-Zui-testing" "-Zdeduplicate-diagnostics=no" "-Zwrite-long-types-to-disk=no" "-Cstrip=debuginfo" "--emit" "metadata" "-C" "prefer-dynamic" "--out-dir" "/checkout/obj/build/aarch64-unknown-linux-gnu/test/ui/asm/powerpc/bad-reg.aix64" "-A" "unused" "-W" "unused_attributes" "-A" "internal_features" "-A" "unused_parens" "-A" "unused_braces" "-Crpath" "-Cdebuginfo=0" "-Lnative=/checkout/obj/build/aarch64-unknown-linux-gnu/native/rust-test-helpers" "-Cpanic=abort" "-Cforce-unwind-tables=yes" "--target" "powerpc64-ibm-aix" "--extern" "minicore=/checkout/obj/build/aarch64-unknown-linux-gnu/test/ui/asm/powerpc/bad-reg.aix64/libminicore.rlib"
stdout: none
--- stderr -------------------------------
error: invalid register `sp`: the stack pointer cannot be used as an operand for inline asm
##[error]  --> /checkout/tests/ui/asm/powerpc/bad-reg.rs:38:18
   |
LL |         asm!("", out("sp") _);
   |                  ^^^^^^^^^^^

error: invalid register `r2`: r2 is a system reserved register and cannot be used as an operand for inline asm
##[error]  --> /checkout/tests/ui/asm/powerpc/bad-reg.rs:40:18
   |
LL |         asm!("", out("r2") _);
   |                  ^^^^^^^^^^^

error: invalid register `r30`: r30 is used internally by LLVM and cannot be used as an operand for inline asm
##[error]  --> /checkout/tests/ui/asm/powerpc/bad-reg.rs:46:18
   |
LL |         asm!("", out("r30") _);
   |                  ^^^^^^^^^^^^

error: invalid register `fp`: the frame pointer cannot be used as an operand for inline asm
##[error]  --> /checkout/tests/ui/asm/powerpc/bad-reg.rs:48:18
   |
LL |         asm!("", out("fp") _);
   |                  ^^^^^^^^^^^

error: invalid register `vrsave`: the vrsave register cannot be used as an operand for inline asm
##[error]  --> /checkout/tests/ui/asm/powerpc/bad-reg.rs:50:18
   |
LL |         asm!("", out("vrsave") _);
   |                  ^^^^^^^^^^^^^^^

error: register class `cr` can only be used as a clobber, not as an input or output
##[error]  --> /checkout/tests/ui/asm/powerpc/bad-reg.rs:139:18
   |
LL |         asm!("", in("cr") x);
   |                  ^^^^^^^^^^

error: register class `cr` can only be used as a clobber, not as an input or output
##[error]  --> /checkout/tests/ui/asm/powerpc/bad-reg.rs:142:18
   |
LL |         asm!("", out("cr") x);
   |                  ^^^^^^^^^^^

error: register class `cr` can only be used as a clobber, not as an input or output
##[error]  --> /checkout/tests/ui/asm/powerpc/bad-reg.rs:145:26
   |
LL |         asm!("/* {} */", in(cr) x);
   |                          ^^^^^^^^

error: register class `cr` can only be used as a clobber, not as an input or output
##[error]  --> /checkout/tests/ui/asm/powerpc/bad-reg.rs:148:26
   |
LL |         asm!("/* {} */", out(cr) _);
   |                          ^^^^^^^^^

error: register class `ctr` can only be used as a clobber, not as an input or output
##[error]  --> /checkout/tests/ui/asm/powerpc/bad-reg.rs:152:18
   |
LL |         asm!("", in("ctr") x);
   |                  ^^^^^^^^^^^

error: register class `ctr` can only be used as a clobber, not as an input or output
##[error]  --> /checkout/tests/ui/asm/powerpc/bad-reg.rs:155:18
   |
LL |         asm!("", out("ctr") x);
   |                  ^^^^^^^^^^^^

error: register class `ctr` can only be used as a clobber, not as an input or output
##[error]  --> /checkout/tests/ui/asm/powerpc/bad-reg.rs:158:26
   |
LL |         asm!("/* {} */", in(ctr) x);
   |                          ^^^^^^^^^

error: register class `ctr` can only be used as a clobber, not as an input or output
##[error]  --> /checkout/tests/ui/asm/powerpc/bad-reg.rs:161:26
   |
LL |         asm!("/* {} */", out(ctr) _);
   |                          ^^^^^^^^^^

error: register class `lr` can only be used as a clobber, not as an input or output
##[error]  --> /checkout/tests/ui/asm/powerpc/bad-reg.rs:165:18
   |
LL |         asm!("", in("lr") x);
   |                  ^^^^^^^^^^

error: register class `lr` can only be used as a clobber, not as an input or output
##[error]  --> /checkout/tests/ui/asm/powerpc/bad-reg.rs:168:18
   |
LL |         asm!("", out("lr") x);
   |                  ^^^^^^^^^^^

error: register class `lr` can only be used as a clobber, not as an input or output
##[error]  --> /checkout/tests/ui/asm/powerpc/bad-reg.rs:171:26
   |
LL |         asm!("/* {} */", in(lr) x);
   |                          ^^^^^^^^

error: register class `lr` can only be used as a clobber, not as an input or output
##[error]  --> /checkout/tests/ui/asm/powerpc/bad-reg.rs:174:26
   |
LL |         asm!("/* {} */", out(lr) _);
   |                          ^^^^^^^^^

error: register class `xer` can only be used as a clobber, not as an input or output
##[error]  --> /checkout/tests/ui/asm/powerpc/bad-reg.rs:178:18
   |
LL |         asm!("", in("xer") x);
   |                  ^^^^^^^^^^^

error: register class `xer` can only be used as a clobber, not as an input or output
##[error]  --> /checkout/tests/ui/asm/powerpc/bad-reg.rs:181:18
   |
LL |         asm!("", out("xer") x);
   |                  ^^^^^^^^^^^^

error: register class `xer` can only be used as a clobber, not as an input or output
##[error]  --> /checkout/tests/ui/asm/powerpc/bad-reg.rs:184:26
   |
LL |         asm!("/* {} */", in(xer) x);
   |                          ^^^^^^^^^

error: register class `xer` can only be used as a clobber, not as an input or output
##[error]  --> /checkout/tests/ui/asm/powerpc/bad-reg.rs:187:26
   |
LL |         asm!("/* {} */", out(xer) _);
   |                          ^^^^^^^^^^

error: register `cr0` conflicts with register `cr`
##[error]  --> /checkout/tests/ui/asm/powerpc/bad-reg.rs:191:31
   |
LL |         asm!("", out("cr") _, out("cr0") _);
   |                  -----------  ^^^^^^^^^^^^ register `cr0`
   |                  |
   |                  register `cr`

error: register `cr1` conflicts with register `cr`
##[error]  --> /checkout/tests/ui/asm/powerpc/bad-reg.rs:193:31
   |
LL |         asm!("", out("cr") _, out("cr1") _);
   |                  -----------  ^^^^^^^^^^^^ register `cr1`
   |                  |
   |                  register `cr`

error: register `cr2` conflicts with register `cr`
##[error]  --> /checkout/tests/ui/asm/powerpc/bad-reg.rs:195:31
   |
LL |         asm!("", out("cr") _, out("cr2") _);
   |                  -----------  ^^^^^^^^^^^^ register `cr2`
   |                  |
   |                  register `cr`

error: register `cr3` conflicts with register `cr`
##[error]  --> /checkout/tests/ui/asm/powerpc/bad-reg.rs:197:31
   |
LL |         asm!("", out("cr") _, out("cr3") _);
   |                  -----------  ^^^^^^^^^^^^ register `cr3`
   |                  |
   |                  register `cr`

error: register `cr4` conflicts with register `cr`
##[error]  --> /checkout/tests/ui/asm/powerpc/bad-reg.rs:199:31
   |
LL |         asm!("", out("cr") _, out("cr4") _);
   |                  -----------  ^^^^^^^^^^^^ register `cr4`
   |                  |
   |                  register `cr`

error: register `cr5` conflicts with register `cr`
##[error]  --> /checkout/tests/ui/asm/powerpc/bad-reg.rs:201:31
   |
LL |         asm!("", out("cr") _, out("cr5") _);
   |                  -----------  ^^^^^^^^^^^^ register `cr5`
   |                  |
   |                  register `cr`

error: register `cr6` conflicts with register `cr`
##[error]  --> /checkout/tests/ui/asm/powerpc/bad-reg.rs:203:31
   |
LL |         asm!("", out("cr") _, out("cr6") _);
   |                  -----------  ^^^^^^^^^^^^ register `cr6`
   |                  |
   |                  register `cr`

error: register `cr7` conflicts with register `cr`
##[error]  --> /checkout/tests/ui/asm/powerpc/bad-reg.rs:205:31
   |
LL |         asm!("", out("cr") _, out("cr7") _);
   |                  -----------  ^^^^^^^^^^^^ register `cr7`
   |                  |
   |                  register `cr`

error: register `vs0` conflicts with register `f0`
##[error]  --> /checkout/tests/ui/asm/powerpc/bad-reg.rs:208:31
   |
LL |         asm!("", out("f0") _, out("vs0") _);
   |                  -----------  ^^^^^^^^^^^^ register `vs0`
   |                  |

[RalfJung]

Closing in favor of #153876 -- clearly there's more going on here than I understand, so I shouldn't be changing the code. I hope someone I pinged in that issue will be able to help. :)