[clang] [PowerPC] Disable float128 on AIX in Clang (PR #67298)

[Qiu Chaofan via cfe-commits]

https://github.com/ecnelises created https://github.com/llvm/llvm-project/pull/67298

PowerPC AIX backend does not support float128 at all. Diagnose even when specifying -mfloat128 to avoid backend crash.

>From 58cd725354eae6aa733c98374a804de0ef595c60 Mon Sep 17 00:00:00 2001
From: Qiu Chaofan <qiucofan at cn.ibm.com>
Date: Mon, 25 Sep 2023 16:57:39 +0800
Subject: [PATCH] [PowerPC] Disable float128 on AIX in Clang

PowerPC AIX backend does not support float128 at all. Diagnose even when
specifying -mfloat128 to avoid backend crash.
---
 clang/lib/Basic/Targets/PPC.cpp | 2 +-
 clang/test/Sema/128bitfloat.cpp | 1 +
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/clang/lib/Basic/Targets/PPC.cpp b/clang/lib/Basic/Targets/PPC.cpp
index e0abc069032e1ce..119ed9c1ac4504e 100644
--- a/clang/lib/Basic/Targets/PPC.cpp
+++ b/clang/lib/Basic/Targets/PPC.cpp
@@ -52,7 +52,7 @@ bool PPCTargetInfo::handleTargetFeatures(std::vector<std::string> &Features,
       HasDirectMove = true;
     } else if (Feature == "+htm") {
       HasHTM = true;
-    } else if (Feature == "+float128") {
+    } else if (Feature == "+float128" && !getTriple().isOSAIX()) {
       HasFloat128 = true;
     } else if (Feature == "+power9-vector") {
       HasP9Vector = true;
diff --git a/clang/test/Sema/128bitfloat.cpp b/clang/test/Sema/128bitfloat.cpp
index b98b42496e8db27..bd9f2889c98f6aa 100644
--- a/clang/test/Sema/128bitfloat.cpp
+++ b/clang/test/Sema/128bitfloat.cpp
@@ -1,6 +1,7 @@
 // RUN: %clang_cc1 -verify -std=gnu++11 %s
 // RUN: %clang_cc1 -verify -std=c++11 %s
 // RUN: %clang_cc1 -triple powerpc64-linux -verify -std=c++11 %s
+// RUN: %clang_cc1 -triple powerpc64-ibm-aix -target-feature +float128 -verify -std=c++11 %s
 // RUN: %clang_cc1 -triple i686-windows-gnu -verify -std=c++11 %s
 // RUN: %clang_cc1 -triple x86_64-windows-gnu -verify -std=c++11 %s
 // RUN: %clang_cc1 -triple x86_64-windows-msvc -verify -std=c++11 %s