[clang] [Sparc] Add flags to enable errata workaround pass for GR712RC and UT700 (PR #104742)

[Daniel Cederman via cfe-commits]

https://github.com/doac created https://github.com/llvm/llvm-project/pull/104742

This adds the flags -mfix-gr712rc and -mfix-ut700 which enables the necessary errata workarounds for the GR712RC and UT700 processors. The functionality enabled by the flags is the same as the functionality provided by the corresponding GCC flags.

>From a68dec7b074afdc003c63e721cd384c9c6721610 Mon Sep 17 00:00:00 2001
From: Daniel Cederman <cederman at gaisler.com>
Date: Mon, 19 Aug 2024 08:17:36 +0200
Subject: [PATCH] [Sparc] Add flags to enable errata workaround pass for
 GR712RC and UT700

This adds the flags -mfix-gr712rc and -mfix-ut700 which enables the
necessary errata workarounds for the GR712RC and UT700 processors.
The functionality enabled by the flag is the same as the functionality
provided by the corresponding GCC flag.
---
 clang/include/clang/Driver/Options.td      |  4 ++++
 clang/lib/Driver/ToolChains/Arch/Sparc.cpp | 13 +++++++++++++
 clang/test/Driver/sparc-fix.c              | 12 ++++++++++++
 3 files changed, 29 insertions(+)
 create mode 100644 clang/test/Driver/sparc-fix.c

diff --git a/clang/include/clang/Driver/Options.td b/clang/include/clang/Driver/Options.td
index cfd9e595c55178..0ef3a2dbd69ae3 100644
--- a/clang/include/clang/Driver/Options.td
+++ b/clang/include/clang/Driver/Options.td
@@ -6148,6 +6148,10 @@ def mv8plus : Flag<["-"], "mv8plus">, Group<m_sparc_Features_Group>,
   HelpText<"Enable V8+ mode, allowing use of 64-bit V9 instructions in 32-bit code">;
 def mno_v8plus : Flag<["-"], "mno-v8plus">, Group<m_sparc_Features_Group>,
   HelpText<"Disable V8+ mode">;
+def mfix_gr712rc : Flag<["-"], "mfix-gr712rc">, Group<m_sparc_Features_Group>,
+  HelpText<"Enable workarounds for GR712RC errata">;
+def mfix_ut700 : Flag<["-"], "mfix-ut700">, Group<m_sparc_Features_Group>,
+  HelpText<"Enable workarounds for UT700 errata">;
 foreach i = 1 ... 7 in
   def ffixed_g#i : Flag<["-"], "ffixed-g"#i>, Group<m_sparc_Features_Group>,
     HelpText<"Reserve the G"#i#" register (SPARC only)">;
diff --git a/clang/lib/Driver/ToolChains/Arch/Sparc.cpp b/clang/lib/Driver/ToolChains/Arch/Sparc.cpp
index 5a1fedbec06adf..f7f0a265fef68b 100644
--- a/clang/lib/Driver/ToolChains/Arch/Sparc.cpp
+++ b/clang/lib/Driver/ToolChains/Arch/Sparc.cpp
@@ -264,4 +264,17 @@ void sparc::getSparcTargetFeatures(const Driver &D, const ArgList &Args,
 
   if (Args.hasArg(options::OPT_ffixed_i5))
     Features.push_back("+reserve-i5");
+
+  if (Args.hasArg(options::OPT_mfix_gr712rc)) {
+    Features.push_back("+fix-tn0009");
+    Features.push_back("+fix-tn0011");
+    Features.push_back("+fix-tn0012");
+    Features.push_back("+fix-tn0013");
+  }
+
+  if (Args.hasArg(options::OPT_mfix_ut700)) {
+    Features.push_back("+fix-tn0009");
+    Features.push_back("+fix-tn0010");
+    Features.push_back("+fix-tn0013");
+  }
 }
diff --git a/clang/test/Driver/sparc-fix.c b/clang/test/Driver/sparc-fix.c
new file mode 100644
index 00000000000000..2b4bc4117adb68
--- /dev/null
+++ b/clang/test/Driver/sparc-fix.c
@@ -0,0 +1,12 @@
+// RUN: %clang -target sparc -mfix-gr712rc -### %s 2> %t
+// RUN: FileCheck --check-prefix=CHECK-FIX-GR712RC < %t %s
+// CHECK-FIX-GR712RC: "-target-feature" "+fix-tn0009"
+// CHECK-FIX-GR712RC: "-target-feature" "+fix-tn0011"
+// CHECK-FIX-GR712RC: "-target-feature" "+fix-tn0012"
+// CHECK-FIX-GR712RC: "-target-feature" "+fix-tn0013"
+
+// RUN: %clang -target sparc -mfix-ut700 -### %s 2> %t
+// RUN: FileCheck --check-prefix=CHECK-FIX-UT700 < %t %s
+// CHECK-FIX-UT700: "-target-feature" "+fix-tn0009"
+// CHECK-FIX-UT700: "-target-feature" "+fix-tn0010"
+// CHECK-FIX-UT700: "-target-feature" "+fix-tn0013"