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Override default target CPUs to match distro settings

This commit is contained in:
Josh Stone 2023-06-23 15:31:28 -07:00
parent 6fff218b19
commit 356401c7f1
4 changed files with 284 additions and 17 deletions
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98
0001-Expand-the-LLVM-coverage-of-print-target-cpus.patch Normal file
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@ -0,0 +1,98 @@
From 23b3553ca0332dee4bdd79251b881d552e6bbafa Mon Sep 17 00:00:00 2001
From: Josh Stone <jistone@redhat.com>
Date: Fri, 5 May 2023 17:27:59 -0700
Subject: [PATCH] Expand the LLVM coverage of `--print target-cpus`
We've been relying on a custom patch to add `MCSubtargetInfo::getCPUTable`
for `rustc --print target-cpus`, and just printing that it's not supported
on external LLVM builds. LLVM `main` now has `getAllProcessorDescriptions`
that can replace ours, so now we try to use that. In addition, the fallback
path can at least print the native and default cpu options.
There were also some mismatches in the function signatures here between
`LLVM_RUSTLLVM` and otherwise; this is now mitigated by sharing these
functions and only using cpp to adjust the function bodies.
(cherry picked from commit 67ae38a336599a7e0d2898a5ea3416b947458f5d)
---
.../rustc_llvm/llvm-wrapper/PassWrapper.cpp | 30 ++++++++++---------
1 file changed, 16 insertions(+), 14 deletions(-)
diff --git a/compiler/rustc_llvm/llvm-wrapper/PassWrapper.cpp b/compiler/rustc_llvm/llvm-wrapper/PassWrapper.cpp
index b1503e6e4b87..a4827a57f5cf 100644
--- a/compiler/rustc_llvm/llvm-wrapper/PassWrapper.cpp
+++ b/compiler/rustc_llvm/llvm-wrapper/PassWrapper.cpp
@@ -297,7 +297,6 @@ static Reloc::Model fromRust(LLVMRustRelocModel RustReloc) {
report_fatal_error("Bad RelocModel.");
}
-#ifdef LLVM_RUSTLLVM
/// getLongestEntryLength - Return the length of the longest entry in the table.
template<typename KV>
static size_t getLongestEntryLength(ArrayRef<KV> Table) {
@@ -312,11 +311,21 @@ extern "C" void LLVMRustPrintTargetCPUs(LLVMTargetMachineRef TM, const char* Tar
const MCSubtargetInfo *MCInfo = Target->getMCSubtargetInfo();
const Triple::ArchType HostArch = Triple(sys::getProcessTriple()).getArch();
const Triple::ArchType TargetArch = Target->getTargetTriple().getArch();
+
+#if LLVM_VERSION_GE(17, 0)
+ const ArrayRef<SubtargetSubTypeKV> CPUTable = MCInfo->getAllProcessorDescriptions();
+#elif defined(LLVM_RUSTLLVM)
const ArrayRef<SubtargetSubTypeKV> CPUTable = MCInfo->getCPUTable();
+#else
+ printf("Full target CPU help is not supported by this LLVM version.\n\n");
+ SubtargetSubTypeKV TargetCPUKV = { TargetCPU, {{}}, {{}} };
+ const ArrayRef<SubtargetSubTypeKV> CPUTable = TargetCPUKV;
+#endif
unsigned MaxCPULen = getLongestEntryLength(CPUTable);
printf("Available CPUs for this target:\n");
if (HostArch == TargetArch) {
+ MaxCPULen = std::max(MaxCPULen, (unsigned) std::strlen("native"));
const StringRef HostCPU = sys::getHostCPUName();
printf(" %-*s - Select the CPU of the current host (currently %.*s).\n",
MaxCPULen, "native", (int)HostCPU.size(), HostCPU.data());
@@ -336,34 +345,27 @@ extern "C" void LLVMRustPrintTargetCPUs(LLVMTargetMachineRef TM, const char* Tar
}
extern "C" size_t LLVMRustGetTargetFeaturesCount(LLVMTargetMachineRef TM) {
+#ifdef LLVM_RUSTLLVM
const TargetMachine *Target = unwrap(TM);
const MCSubtargetInfo *MCInfo = Target->getMCSubtargetInfo();
const ArrayRef<SubtargetFeatureKV> FeatTable = MCInfo->getFeatureTable();
return FeatTable.size();
+#else
+ return 0;
+#endif
}
extern "C" void LLVMRustGetTargetFeature(LLVMTargetMachineRef TM, size_t Index,
const char** Feature, const char** Desc) {
+#ifdef LLVM_RUSTLLVM
const TargetMachine *Target = unwrap(TM);
const MCSubtargetInfo *MCInfo = Target->getMCSubtargetInfo();
const ArrayRef<SubtargetFeatureKV> FeatTable = MCInfo->getFeatureTable();
const SubtargetFeatureKV Feat = FeatTable[Index];
*Feature = Feat.Key;
*Desc = Feat.Desc;
-}
-
-#else
-
-extern "C" void LLVMRustPrintTargetCPUs(LLVMTargetMachineRef) {
- printf("Target CPU help is not supported by this LLVM version.\n\n");
-}
-
-extern "C" size_t LLVMRustGetTargetFeaturesCount(LLVMTargetMachineRef) {
- return 0;
-}
-
-extern "C" void LLVMRustGetTargetFeature(LLVMTargetMachineRef, const char**, const char**) {}
#endif
+}
extern "C" const char* LLVMRustGetHostCPUName(size_t *len) {
StringRef Name = sys::getHostCPUName();
--
2.40.1

53
0001-Let-environment-variables-override-some-default-CPUs.patch Normal file
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@ -0,0 +1,53 @@
From 6e2adb05860b72610291d3b0e8bd525c44cb0cc9 Mon Sep 17 00:00:00 2001
From: Josh Stone <jistone@redhat.com>
Date: Fri, 9 Jun 2023 15:23:08 -0700
Subject: [PATCH] Let environment variables override some default CPUs
---
compiler/rustc_target/src/spec/powerpc64le_unknown_linux_gnu.rs | 2 +-
compiler/rustc_target/src/spec/s390x_unknown_linux_gnu.rs | 2 +-
compiler/rustc_target/src/spec/x86_64_unknown_linux_gnu.rs | 2 +-
3 files changed, 3 insertions(+), 3 deletions(-)
diff --git a/compiler/rustc_target/src/spec/powerpc64le_unknown_linux_gnu.rs b/compiler/rustc_target/src/spec/powerpc64le_unknown_linux_gnu.rs
index fd896e086b54..08d0c43d20b4 100644
--- a/compiler/rustc_target/src/spec/powerpc64le_unknown_linux_gnu.rs
+++ b/compiler/rustc_target/src/spec/powerpc64le_unknown_linux_gnu.rs
@@ -2,7 +2,7 @@
pub fn target() -> Target {
let mut base = super::linux_gnu_base::opts();
- base.cpu = "ppc64le".into();
+ base.cpu = option_env!("RUSTC_TARGET_CPU_PPC64LE").unwrap_or("ppc64le").into();
base.add_pre_link_args(LinkerFlavor::Gnu(Cc::Yes, Lld::No), &["-m64"]);
base.max_atomic_width = Some(64);
base.stack_probes = StackProbeType::Inline;
diff --git a/compiler/rustc_target/src/spec/s390x_unknown_linux_gnu.rs b/compiler/rustc_target/src/spec/s390x_unknown_linux_gnu.rs
index f2c722b9a89d..17a14d10b27e 100644
--- a/compiler/rustc_target/src/spec/s390x_unknown_linux_gnu.rs
+++ b/compiler/rustc_target/src/spec/s390x_unknown_linux_gnu.rs
@@ -5,7 +5,7 @@ pub fn target() -> Target {
let mut base = super::linux_gnu_base::opts();
base.endian = Endian::Big;
// z10 is the oldest CPU supported by LLVM
- base.cpu = "z10".into();
+ base.cpu = option_env!("RUSTC_TARGET_CPU_S390X").unwrap_or("z10").into();
// FIXME: The ABI implementation in cabi_s390x.rs is for now hard-coded to assume the no-vector
// ABI. Pass the -vector feature string to LLVM to respect this assumption. On LLVM < 16, we
// also strip v128 from the data_layout below to match the older LLVM's expectation.
diff --git a/compiler/rustc_target/src/spec/x86_64_unknown_linux_gnu.rs b/compiler/rustc_target/src/spec/x86_64_unknown_linux_gnu.rs
index 9af1049b8702..68f876dd18c3 100644
--- a/compiler/rustc_target/src/spec/x86_64_unknown_linux_gnu.rs
+++ b/compiler/rustc_target/src/spec/x86_64_unknown_linux_gnu.rs
@@ -2,7 +2,7 @@
pub fn target() -> Target {
let mut base = super::linux_gnu_base::opts();
- base.cpu = "x86-64".into();
+ base.cpu = option_env!("RUSTC_TARGET_CPU_X86_64").unwrap_or("x86-64").into();
base.max_atomic_width = Some(64);
base.add_pre_link_args(LinkerFlavor::Gnu(Cc::Yes, Lld::No), &["-m64"]);
base.stack_probes = StackProbeType::X86;
--
2.40.1

102
0001-Rollup-merge-of-110876-mj10021-issue-110647-fix-r-b-.patch Normal file
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@ -0,0 +1,102 @@
From 6edbc665ea37ba3bf852b4eb42898b7d6e7b919c Mon Sep 17 00:00:00 2001
From: Dylan DPC <99973273+Dylan-DPC@users.noreply.github.com>
Date: Fri, 5 May 2023 18:40:35 +0530
Subject: [PATCH] Rollup merge of #110876 - mj10021:issue-110647-fix, r=b-naber
Added default target cpu to `--print target-cpus` output and updated docs
Added default target cpu info as requested in issue #110647 and noted the new output in the documentation
(cherry picked from commit 65702bfd6bfb8616e182ddd19d0520ce7e35314a)
---
compiler/rustc_codegen_llvm/src/llvm/ffi.rs | 2 +-
compiler/rustc_codegen_llvm/src/llvm_util.rs | 9 ++++++++-
.../rustc_llvm/llvm-wrapper/PassWrapper.cpp | 17 +++++++++++++----
src/doc/rustc/src/codegen-options/index.md | 3 ++-
4 files changed, 24 insertions(+), 7 deletions(-)
diff --git a/compiler/rustc_codegen_llvm/src/llvm/ffi.rs b/compiler/rustc_codegen_llvm/src/llvm/ffi.rs
index 05bbdbb7415c..383a9d2e5ddb 100644
--- a/compiler/rustc_codegen_llvm/src/llvm/ffi.rs
+++ b/compiler/rustc_codegen_llvm/src/llvm/ffi.rs
@@ -2263,7 +2263,7 @@ pub fn LLVMRustDIBuilderCreateDebugLocation<'a>(
pub fn LLVMRustHasFeature(T: &TargetMachine, s: *const c_char) -> bool;
- pub fn LLVMRustPrintTargetCPUs(T: &TargetMachine);
+ pub fn LLVMRustPrintTargetCPUs(T: &TargetMachine, cpu: *const c_char);
pub fn LLVMRustGetTargetFeaturesCount(T: &TargetMachine) -> size_t;
pub fn LLVMRustGetTargetFeature(
T: &TargetMachine,
diff --git a/compiler/rustc_codegen_llvm/src/llvm_util.rs b/compiler/rustc_codegen_llvm/src/llvm_util.rs
index 46692fd5e8bc..2fbdab9f8ce0 100644
--- a/compiler/rustc_codegen_llvm/src/llvm_util.rs
+++ b/compiler/rustc_codegen_llvm/src/llvm_util.rs
@@ -329,7 +329,14 @@ pub(crate) fn print(req: PrintRequest, sess: &Session) {
require_inited();
let tm = create_informational_target_machine(sess);
match req {
- PrintRequest::TargetCPUs => unsafe { llvm::LLVMRustPrintTargetCPUs(tm) },
+ PrintRequest::TargetCPUs => {
+ // SAFETY generate a C compatible string from a byte slice to pass
+ // the target CPU name into LLVM, the lifetime of the reference is
+ // at least as long as the C function
+ let cpu_cstring = CString::new(handle_native(sess.target.cpu.as_ref()))
+ .unwrap_or_else(|e| bug!("failed to convert to cstring: {}", e));
+ unsafe { llvm::LLVMRustPrintTargetCPUs(tm, cpu_cstring.as_ptr()) };
+ }
PrintRequest::TargetFeatures => print_target_features(sess, tm),
_ => bug!("rustc_codegen_llvm can't handle print request: {:?}", req),
}
diff --git a/compiler/rustc_llvm/llvm-wrapper/PassWrapper.cpp b/compiler/rustc_llvm/llvm-wrapper/PassWrapper.cpp
index 08e38b0c9d59..b1503e6e4b87 100644
--- a/compiler/rustc_llvm/llvm-wrapper/PassWrapper.cpp
+++ b/compiler/rustc_llvm/llvm-wrapper/PassWrapper.cpp
@@ -307,7 +307,7 @@ static size_t getLongestEntryLength(ArrayRef<KV> Table) {
return MaxLen;
}
-extern "C" void LLVMRustPrintTargetCPUs(LLVMTargetMachineRef TM) {
+extern "C" void LLVMRustPrintTargetCPUs(LLVMTargetMachineRef TM, const char* TargetCPU) {
const TargetMachine *Target = unwrap(TM);
const MCSubtargetInfo *MCInfo = Target->getMCSubtargetInfo();
const Triple::ArchType HostArch = Triple(sys::getProcessTriple()).getArch();
@@ -321,9 +321,18 @@ extern "C" void LLVMRustPrintTargetCPUs(LLVMTargetMachineRef TM) {
printf(" %-*s - Select the CPU of the current host (currently %.*s).\n",
MaxCPULen, "native", (int)HostCPU.size(), HostCPU.data());
}
- for (auto &CPU : CPUTable)
- printf(" %-*s\n", MaxCPULen, CPU.Key);
- printf("\n");
+ for (auto &CPU : CPUTable) {
+ // Compare cpu against current target to label the default
+ if (strcmp(CPU.Key, TargetCPU) == 0) {
+ printf(" %-*s - This is the default target CPU"
+ " for the current build target (currently %s).",
+ MaxCPULen, CPU.Key, Target->getTargetTriple().str().c_str());
+ }
+ else {
+ printf(" %-*s", MaxCPULen, CPU.Key);
+ }
+ printf("\n");
+ }
}
extern "C" size_t LLVMRustGetTargetFeaturesCount(LLVMTargetMachineRef TM) {
diff --git a/src/doc/rustc/src/codegen-options/index.md b/src/doc/rustc/src/codegen-options/index.md
index 62347f169a5e..3a14f582d600 100644
--- a/src/doc/rustc/src/codegen-options/index.md
+++ b/src/doc/rustc/src/codegen-options/index.md
@@ -574,7 +574,8 @@ change in the future.
This instructs `rustc` to generate code specifically for a particular processor.
You can run `rustc --print target-cpus` to see the valid options to pass
-here. Each target has a default base CPU. Special values include:
+and the default target CPU for the current buid target.
+Each target has a default base CPU. Special values include:
* `native` can be passed to use the processor of the host machine.
* `generic` refers to an LLVM target with minimal features but modern tuning.
--
2.40.1

48
rust.spec
View File

@ -84,7 +84,7 @@
Name: rust
Version: 1.70.0
Release: 1%{?dist}
Release: 2%{?dist}
Summary: The Rust Programming Language
License: (ASL 2.0 or MIT) and (BSD and MIT)
# ^ written as: (rust itself) and (bundled libraries)
@ -106,6 +106,18 @@ Patch1: 0001-Use-lld-provided-by-system-for-wasm.patch
# Set a substitute-path in rust-gdb for standard library sources.
Patch2: rustc-1.70.0-rust-gdb-substitute-path.patch
# Override default target CPUs to match distro settings
# TODO: upstream this ability into the actual build configuration
Patch3: 0001-Let-environment-variables-override-some-default-CPUs.patch
# Added default target cpu to `--print target-cpus` output
# https://github.com/rust-lang/rust/pull/110876
Patch4: 0001-Rollup-merge-of-110876-mj10021-issue-110647-fix-r-b-.patch
# Improve `--print target-cpus` for non-bundled LLVM
# https://github.com/rust-lang/rust/pull/111274
Patch5: 0001-Expand-the-LLVM-coverage-of-print-target-cpus.patch
### RHEL-specific patches below ###
# Simple rpm macros for rust-toolset (as opposed to full rust-packaging)
@ -574,6 +586,9 @@ test -f '%{local_rust_root}/bin/rustc'
%patch -P1 -p1
%patch -P2 -p1
%patch -P3 -p1
%patch -P4 -p1
%patch -P5 -p1
%if %with disabled_libssh2
%patch -P100 -p1
@ -646,24 +661,20 @@ find -name '*.rs' -type f -perm /111 -exec chmod -v -x '{}' '+'
%endif
# These are similar to __cflags_arch_* in /usr/lib/rpm/redhat/macros
%if 0%{?fedora} || 0%{?rhel} >= 9
%ifarch x86_64
%global rust_target_cpu %[0%{?rhel} >= 10 ? "x86-64-v3" : ""]
%global rust_target_cpu %[0%{?rhel} == 9 ? "x86-64-v2" : "%{rust_target_cpu}"]
%endif
%ifarch s390x
%global rust_target_cpu %[0%{?rhel} >= 9 ? "z14" : "zEC12"]
%endif
%ifarch ppc64le
%global rust_target_cpu %[0%{?rhel} >= 9 ? "pwr9" : "pwr8"]
%endif
%endif
%{lua: function rustc_target_cpus()
local fedora = tonumber(rpm.expand("0%{?fedora}"))
local rhel = tonumber(rpm.expand("0%{?rhel}"))
local env =
" RUSTC_TARGET_CPU_X86_64=x86-64" .. ((rhel >= 10) and "-v3" or (rhel == 9) and "-v2" or "")
.. " RUSTC_TARGET_CPU_PPC64LE=" .. ((rhel >= 9) and "pwr9" or "pwr8")
.. " RUSTC_TARGET_CPU_S390X=" ..
((rhel >= 9) and "z14" or (rhel == 8 or fedora >= 38) and "z13" or
(fedora >= 26) and "zEC12" or (rhel == 7) and "z196" or "z10")
return env
end}
# Set up shared environment variables for build/install/check
%global rust_env %{?rustflags:RUSTFLAGS="%{rustflags}"}
%if "%{?rust_target_cpu}" != ""
%global rust_env %{?rust_env} CARGO_TARGET_%{rust_triple_env}_RUSTFLAGS=-Ctarget-cpu=%{rust_target_cpu}
%endif
%global rust_env %{?rustflags:RUSTFLAGS="%{rustflags}"} %{lua: print(rustc_target_cpus())}
%if %defined cmake_path
%global rust_env %{?rust_env} PATH="%{cmake_path}:$PATH"
%endif
@ -1049,6 +1060,9 @@ end}
%changelog
* Fri Jun 23 2023 Josh Stone <jistone@redhat.com> - 1.70.0-2
- Override default target CPUs to match distro settings
* Thu Jun 01 2023 Josh Stone <jistone@redhat.com> - 1.70.0-1
- Update to 1.70.0.