From 506fbb7fd937e2ff058104fc1c5b62b4eba44398 Mon Sep 17 00:00:00 2001
From: Folkert de Vries <folkert@folkertdev.nl>
Date: Sun, 20 Sep 2026 12:57:19 +0200
Subject: [PATCH] don't mark `f128` as reliable on AIX

In fact the type is really not supported at all there.
---
 compiler/rustc_codegen_llvm/src/llvm_util.rs | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/compiler/rustc_codegen_llvm/src/llvm_util.rs b/compiler/rustc_codegen_llvm/src/llvm_util.rs
index 5324ec240b0ab..718a500a9abec 100644
--- a/compiler/rustc_codegen_llvm/src/llvm_util.rs
+++ b/compiler/rustc_codegen_llvm/src/llvm_util.rs
@@ -432,6 +432,8 @@ fn update_target_reliable_float_cfg(target: &Target, cfg: &mut TargetConfig) {
         // - with +vsx <https://github.com/llvm/llvm-project/pull/216613>
         // - without +vsx <https://github.com/rust-lang/rust/issues/125109>
         (Arch::PowerPC, _) => false,
+        // AIX does not support f128.
+        (Arch::PowerPC64, Os::Aix) => false,
         // ABI bugs on BE without +vsx <https://github.com/rust-lang/rust/issues/125109>.
         (Arch::PowerPC64, _) => cfg.internal_target_features.contains(&sym::vsx),
         // ABI unsupported  <https://github.com/llvm/llvm-project/issues/41838> (fixed in llvm22)