[Driver] Default to -mcpu=ultrasparc3 on Solaris/SPARC #149990

rorth · 2025-07-22T09:55:33Z

Prompted by PR #149652, this patch changes the Solaris/SPARC default to -mcpu, matching both the Oracle Studio 12.6 compilers and GCC 16: [PATCH] Default to -mcpu=ultrasparc3 on Solaris/SPARC. This is equivalent to enabling the vis2 feature.

Tested on sparcv9-sun-solaris2.11 and sparc64-unknown-linux-gnu.

Prompted by PR llvm#149652, this patch changes the Solaris/SPARC default to -mcpu, matching both the Oracle Studio 12.6 compilers and GCC 16: [[PATCH] Default to -mcpu=ultrasparc3 on Solaris/SPARC](https://gcc.gnu.org/pipermail/gcc-patches/2025-July/690191.html). This is equivalent to enabling the `vis2` feature. Tested on `sparcv9-sun-solaris2.11` and `sparc64-unknown-linux-gnu`.

llvmbot · 2025-07-22T09:56:06Z

@llvm/pr-subscribers-clang-driver

@llvm/pr-subscribers-backend-sparc

Author: Rainer Orth (rorth)

Changes

Prompted by PR #149652, this patch changes the Solaris/SPARC default to -mcpu, matching both the Oracle Studio 12.6 compilers and GCC 16: [PATCH] Default to -mcpu=ultrasparc3 on Solaris/SPARC. This is equivalent to enabling the vis2 feature.

Tested on sparcv9-sun-solaris2.11 and sparc64-unknown-linux-gnu.

Full diff: https://github.com/llvm/llvm-project/pull/149990.diff

2 Files Affected:

(modified) clang/lib/Driver/ToolChains/Arch/Sparc.cpp (+6-1)
(modified) clang/test/Driver/sparc-target-features.c (+5)

diff --git a/clang/lib/Driver/ToolChains/Arch/Sparc.cpp b/clang/lib/Driver/ToolChains/Arch/Sparc.cpp
index 504f110eac87c..33331351244e1 100644
--- a/clang/lib/Driver/ToolChains/Arch/Sparc.cpp
+++ b/clang/lib/Driver/ToolChains/Arch/Sparc.cpp
@@ -23,7 +23,9 @@ const char *sparc::getSparcAsmModeForCPU(StringRef Name,
   if (Triple.getArch() == llvm::Triple::sparcv9) {
     const char *DefV9CPU;
 
-    if (Triple.isOSLinux() || Triple.isOSFreeBSD() || Triple.isOSOpenBSD())
+    if (Triple.isOSSolaris())
+      DefV9CPU = "-Av9b";
+    else if (Triple.isOSLinux() || Triple.isOSFreeBSD() || Triple.isOSOpenBSD())
       DefV9CPU = "-Av9a";
     else
       DefV9CPU = "-Av9";
@@ -157,6 +159,7 @@ void sparc::getSparcTargetFeatures(const Driver &D, const llvm::Triple &Triple,
   bool IsSparcV9ATarget =
       (Triple.getArch() == llvm::Triple::sparcv9) &&
       (Triple.isOSLinux() || Triple.isOSFreeBSD() || Triple.isOSOpenBSD());
+  bool IsSparcV9BTarget = Triple.isOSSolaris();
   if (Arg *A = Args.getLastArg(options::OPT_mvis, options::OPT_mno_vis)) {
     if (A->getOption().matches(options::OPT_mvis))
       Features.push_back("+vis");
@@ -171,6 +174,8 @@ void sparc::getSparcTargetFeatures(const Driver &D, const llvm::Triple &Triple,
       Features.push_back("+vis2");
     else
       Features.push_back("-vis2");
+  } else if (IsSparcV9BTarget) {
+    Features.push_back("+vis2");
   }
 
   if (Arg *A = Args.getLastArg(options::OPT_mvis3, options::OPT_mno_vis3)) {
diff --git a/clang/test/Driver/sparc-target-features.c b/clang/test/Driver/sparc-target-features.c
index a839604ff1bc0..48a180caf259b 100644
--- a/clang/test/Driver/sparc-target-features.c
+++ b/clang/test/Driver/sparc-target-features.c
@@ -20,6 +20,11 @@
 
 // RUN: %clang --target=sparc -mvis2 %s -### 2>&1 | FileCheck -check-prefix=VIS2 %s
 // RUN: %clang --target=sparc -mno-vis2 %s -### 2>&1 | FileCheck -check-prefix=NO-VIS2 %s
+/// Solaris/SPARC defaults to -mvis2
+// RUN: %clang --target=sparc-sun-solaris2.11 %s -### 2>&1 | FileCheck -check-prefix=VIS2 %s
+// RUN: %clang --target=sparc-sun-solaris2.11 -mno-vis2 %s -### 2>&1 | FileCheck -check-prefix=NO-VIS2 %s
+// RUN: %clang --target=sparcv9-sun-solaris2.11 %s -### 2>&1 | FileCheck -check-prefix=VIS2 %s
+// RUN: %clang --target=sparcv9-sun-solaris2.11 -mno-vis2 %s -### 2>&1 | FileCheck -check-prefix=NO-VIS2 %s
 // VIS2: "-target-feature" "+vis2"
 // NO-VIS2: "-target-feature" "-vis2"

llvmbot · 2025-07-22T09:56:07Z

@llvm/pr-subscribers-clang

Author: Rainer Orth (rorth)

Changes

Prompted by PR #149652, this patch changes the Solaris/SPARC default to -mcpu, matching both the Oracle Studio 12.6 compilers and GCC 16: [PATCH] Default to -mcpu=ultrasparc3 on Solaris/SPARC. This is equivalent to enabling the vis2 feature.

Tested on sparcv9-sun-solaris2.11 and sparc64-unknown-linux-gnu.

Full diff: https://github.com/llvm/llvm-project/pull/149990.diff

2 Files Affected:

(modified) clang/lib/Driver/ToolChains/Arch/Sparc.cpp (+6-1)
(modified) clang/test/Driver/sparc-target-features.c (+5)

diff --git a/clang/lib/Driver/ToolChains/Arch/Sparc.cpp b/clang/lib/Driver/ToolChains/Arch/Sparc.cpp
index 504f110eac87c..33331351244e1 100644
--- a/clang/lib/Driver/ToolChains/Arch/Sparc.cpp
+++ b/clang/lib/Driver/ToolChains/Arch/Sparc.cpp
@@ -23,7 +23,9 @@ const char *sparc::getSparcAsmModeForCPU(StringRef Name,
   if (Triple.getArch() == llvm::Triple::sparcv9) {
     const char *DefV9CPU;
 
-    if (Triple.isOSLinux() || Triple.isOSFreeBSD() || Triple.isOSOpenBSD())
+    if (Triple.isOSSolaris())
+      DefV9CPU = "-Av9b";
+    else if (Triple.isOSLinux() || Triple.isOSFreeBSD() || Triple.isOSOpenBSD())
       DefV9CPU = "-Av9a";
     else
       DefV9CPU = "-Av9";
@@ -157,6 +159,7 @@ void sparc::getSparcTargetFeatures(const Driver &D, const llvm::Triple &Triple,
   bool IsSparcV9ATarget =
       (Triple.getArch() == llvm::Triple::sparcv9) &&
       (Triple.isOSLinux() || Triple.isOSFreeBSD() || Triple.isOSOpenBSD());
+  bool IsSparcV9BTarget = Triple.isOSSolaris();
   if (Arg *A = Args.getLastArg(options::OPT_mvis, options::OPT_mno_vis)) {
     if (A->getOption().matches(options::OPT_mvis))
       Features.push_back("+vis");
@@ -171,6 +174,8 @@ void sparc::getSparcTargetFeatures(const Driver &D, const llvm::Triple &Triple,
       Features.push_back("+vis2");
     else
       Features.push_back("-vis2");
+  } else if (IsSparcV9BTarget) {
+    Features.push_back("+vis2");
   }
 
   if (Arg *A = Args.getLastArg(options::OPT_mvis3, options::OPT_mno_vis3)) {
diff --git a/clang/test/Driver/sparc-target-features.c b/clang/test/Driver/sparc-target-features.c
index a839604ff1bc0..48a180caf259b 100644
--- a/clang/test/Driver/sparc-target-features.c
+++ b/clang/test/Driver/sparc-target-features.c
@@ -20,6 +20,11 @@
 
 // RUN: %clang --target=sparc -mvis2 %s -### 2>&1 | FileCheck -check-prefix=VIS2 %s
 // RUN: %clang --target=sparc -mno-vis2 %s -### 2>&1 | FileCheck -check-prefix=NO-VIS2 %s
+/// Solaris/SPARC defaults to -mvis2
+// RUN: %clang --target=sparc-sun-solaris2.11 %s -### 2>&1 | FileCheck -check-prefix=VIS2 %s
+// RUN: %clang --target=sparc-sun-solaris2.11 -mno-vis2 %s -### 2>&1 | FileCheck -check-prefix=NO-VIS2 %s
+// RUN: %clang --target=sparcv9-sun-solaris2.11 %s -### 2>&1 | FileCheck -check-prefix=VIS2 %s
+// RUN: %clang --target=sparcv9-sun-solaris2.11 -mno-vis2 %s -### 2>&1 | FileCheck -check-prefix=NO-VIS2 %s
 // VIS2: "-target-feature" "+vis2"
 // NO-VIS2: "-target-feature" "-vis2"

rorth · 2025-07-22T09:56:43Z

I've got a follow-up patch to similarly default to v8plus on 32-bit Solaris/SPARC. I wonder if this one or both would be appropriate for the release/21.x branch?

While investigating PR llvm#149990, I noticed that while both the Oracle Studio compilers and GCC default to `-mv8plus` on 32-bit Solaris/SPARC, Clang does not. This patch fixes this by enabling the `v8plus` feature. Tested on `sparcv9-sun-solaris2.11` and `sparc64-unknown-linux-gnu`.

llvm-ci · 2025-07-23T07:17:12Z

LLVM Buildbot has detected a new failure on builder openmp-s390x-linux running on systemz-1 while building clang at step 6 "test-openmp".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/88/builds/14248

Here is the relevant piece of the build log for the reference

Step 6 (test-openmp) failure: test (failure)
******************** TEST 'libomp :: tasking/issue-94260-2.c' FAILED ********************
Exit Code: -11

Command Output (stdout):
--
# RUN: at line 1
/home/uweigand/sandbox/buildbot/openmp-s390x-linux/llvm.build/./bin/clang -fopenmp   -I /home/uweigand/sandbox/buildbot/openmp-s390x-linux/llvm.build/runtimes/runtimes-bins/openmp/runtime/src -I /home/uweigand/sandbox/buildbot/openmp-s390x-linux/llvm.src/openmp/runtime/test -L /home/uweigand/sandbox/buildbot/openmp-s390x-linux/llvm.build/runtimes/runtimes-bins/openmp/runtime/src  -fno-omit-frame-pointer -mbackchain -I /home/uweigand/sandbox/buildbot/openmp-s390x-linux/llvm.src/openmp/runtime/test/ompt /home/uweigand/sandbox/buildbot/openmp-s390x-linux/llvm.src/openmp/runtime/test/tasking/issue-94260-2.c -o /home/uweigand/sandbox/buildbot/openmp-s390x-linux/llvm.build/runtimes/runtimes-bins/openmp/runtime/test/tasking/Output/issue-94260-2.c.tmp -lm -latomic && /home/uweigand/sandbox/buildbot/openmp-s390x-linux/llvm.build/runtimes/runtimes-bins/openmp/runtime/test/tasking/Output/issue-94260-2.c.tmp
# executed command: /home/uweigand/sandbox/buildbot/openmp-s390x-linux/llvm.build/./bin/clang -fopenmp -I /home/uweigand/sandbox/buildbot/openmp-s390x-linux/llvm.build/runtimes/runtimes-bins/openmp/runtime/src -I /home/uweigand/sandbox/buildbot/openmp-s390x-linux/llvm.src/openmp/runtime/test -L /home/uweigand/sandbox/buildbot/openmp-s390x-linux/llvm.build/runtimes/runtimes-bins/openmp/runtime/src -fno-omit-frame-pointer -mbackchain -I /home/uweigand/sandbox/buildbot/openmp-s390x-linux/llvm.src/openmp/runtime/test/ompt /home/uweigand/sandbox/buildbot/openmp-s390x-linux/llvm.src/openmp/runtime/test/tasking/issue-94260-2.c -o /home/uweigand/sandbox/buildbot/openmp-s390x-linux/llvm.build/runtimes/runtimes-bins/openmp/runtime/test/tasking/Output/issue-94260-2.c.tmp -lm -latomic
# executed command: /home/uweigand/sandbox/buildbot/openmp-s390x-linux/llvm.build/runtimes/runtimes-bins/openmp/runtime/test/tasking/Output/issue-94260-2.c.tmp
# note: command had no output on stdout or stderr
# error: command failed with exit status: -11

--

********************

While investigating PR #149990, I noticed that while both the Oracle Studio compilers and GCC default to `-mv8plus` on 32-bit Solaris/SPARC, Clang does not. This patch fixes this by enabling the `v8plus` feature. Tested on `sparcv9-sun-solaris2.11` and `sparc64-unknown-linux-gnu`.

Prompted by PR llvm#149652, this patch changes the Solaris/SPARC default to -mcpu, matching both the Oracle Studio 12.6 compilers and GCC 16: [[PATCH] Default to -mcpu=ultrasparc3 on Solaris/SPARC](https://gcc.gnu.org/pipermail/gcc-patches/2025-July/690191.html). This is equivalent to enabling the `vis2` feature. Tested on `sparcv9-sun-solaris2.11` and `sparc64-unknown-linux-gnu`. (cherry picked from commit 0f23569)

Prompted by PR llvm#149652, this patch changes the Solaris/SPARC default to -mcpu, matching both the Oracle Studio 12.6 compilers and GCC 16: [[PATCH] Default to -mcpu=ultrasparc3 on Solaris/SPARC](https://gcc.gnu.org/pipermail/gcc-patches/2025-July/690191.html). This is equivalent to enabling the `vis2` feature. Tested on `sparcv9-sun-solaris2.11` and `sparc64-unknown-linux-gnu`.

While investigating PR llvm#149990, I noticed that while both the Oracle Studio compilers and GCC default to `-mv8plus` on 32-bit Solaris/SPARC, Clang does not. This patch fixes this by enabling the `v8plus` feature. Tested on `sparcv9-sun-solaris2.11` and `sparc64-unknown-linux-gnu`.

While investigating PR llvm#149990, I noticed that while both the Oracle Studio compilers and GCC default to `-mv8plus` on 32-bit Solaris/SPARC, Clang does not. This patch fixes this by enabling the `v8plus` feature. Tested on `sparcv9-sun-solaris2.11` and `sparc64-unknown-linux-gnu`. (cherry picked from commit 0623389)

llvm/llvm-project#149990

rorth requested review from MaskRay and koachan July 22, 2025 09:55

llvmbot added clang Clang issues not falling into any other category backend:Sparc clang:driver 'clang' and 'clang++' user-facing binaries. Not 'clang-cl' labels Jul 22, 2025

MaskRay approved these changes Jul 23, 2025

View reviewed changes

rorth merged commit 0f23569 into llvm:main Jul 23, 2025
13 checks passed

rorth mentioned this pull request Jul 23, 2025

[Driver] Default to -mv8plus on 32-bit Solaris/SPARC #150176

Merged

alexrp mentioned this pull request Jul 25, 2025

Tracking issue for the LLVM 21 upgrade ziglang/zig#23176

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std.Target: make ultrasparc3 the baseline for sparc64-solaris

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llvm/llvm-project#149990

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std.Target: make ultrasparc3 the baseline for sparc64-solaris

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std.Target: make ultrasparc3 the baseline for sparc64-solaris

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std.Target: make ultrasparc3 the baseline for sparc64-solaris

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