[clang] [AMDGPU][True16][Driver] support true16 feature option in clang driver (PR #133298)

[Brox Chen via cfe-commits]

https://github.com/broxigarchen updated https://github.com/llvm/llvm-project/pull/133298

>From 4285b82cd89ad6c036c27bc392fb59474d15db0b Mon Sep 17 00:00:00 2001
From: guochen2 <guochen2 at amd.com>
Date: Thu, 27 Mar 2025 14:41:40 -0400
Subject: [PATCH] add true16 feature in clang driver

---
 clang/include/clang/Driver/Options.td  | 3 +++
 clang/lib/Driver/ToolChains/AMDGPU.cpp | 4 ++++
 clang/test/Driver/amdgpu-features.c    | 5 +++++
 3 files changed, 12 insertions(+)

diff --git a/clang/include/clang/Driver/Options.td b/clang/include/clang/Driver/Options.td
index a7fcb160d3867..68179d7835440 100644
--- a/clang/include/clang/Driver/Options.td
+++ b/clang/include/clang/Driver/Options.td
@@ -5182,6 +5182,9 @@ defm wavefrontsize64 : SimpleMFlag<"wavefrontsize64",
 defm amdgpu_precise_memory_op
     : SimpleMFlag<"amdgpu-precise-memory-op", "Enable", "Disable",
                   " precise memory mode (AMDGPU only)">;
+defm real_true16: SimpleMFlag<"real-true16",
+  "enable real-true16 in GFX11Plus", "enable real-true16 mode",
+  " real-true16 mode (AMDGPU only)">;
 
 def munsafe_fp_atomics : Flag<["-"], "munsafe-fp-atomics">,
   Visibility<[ClangOption, CC1Option]>, Alias<fatomic_ignore_denormal_mode>;
diff --git a/clang/lib/Driver/ToolChains/AMDGPU.cpp b/clang/lib/Driver/ToolChains/AMDGPU.cpp
index 1c5bb08568801..ce0cba5aa536a 100644
--- a/clang/lib/Driver/ToolChains/AMDGPU.cpp
+++ b/clang/lib/Driver/ToolChains/AMDGPU.cpp
@@ -707,6 +707,10 @@ void amdgpu::getAMDGPUTargetFeatures(const Driver &D,
                    options::OPT_mno_amdgpu_precise_memory_op, false))
     Features.push_back("+precise-memory");
 
+  if (Args.hasFlag(options::OPT_mreal_true16, options::OPT_mno_real_true16,
+                   false))
+    Features.push_back("+real-true16");
+
   handleTargetFeaturesGroup(D, Triple, Args, Features,
                             options::OPT_m_amdgpu_Features_Group);
 }
diff --git a/clang/test/Driver/amdgpu-features.c b/clang/test/Driver/amdgpu-features.c
index 864744db203e9..999e4e7240cdd 100644
--- a/clang/test/Driver/amdgpu-features.c
+++ b/clang/test/Driver/amdgpu-features.c
@@ -38,3 +38,8 @@
 
 // RUN: %clang -### -target amdgcn -mcpu=gfx1010 -mno-amdgpu-precise-memory-op %s 2>&1 | FileCheck --check-prefix=NO-PREC-MEM %s
 // NO-PREC-MEM-NOT: {{".*precise-memory"}}
+
+// RUN: %clang -### -target amdgcn -mcpu=gfx1100 -mrealtrue16 %s 2>&1 | FileCheck --check-prefix=REAL16 %s
+// RUN: %clang -### -target amdgcn -mcpu=gfx1100 -mno-realtrue16 %s 2>&1 | FileCheck --check-prefix=FAKE16 %s
+// REAL16: "-target-feature" "+real-true16"
+// FAKE16: {{".*real-true16"}}