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-rw-r--r--lib/Driver/ToolChains/Arch/ARM.cpp132
1 files changed, 86 insertions, 46 deletions
diff --git a/lib/Driver/ToolChains/Arch/ARM.cpp b/lib/Driver/ToolChains/Arch/ARM.cpp
index f55efc1a22e3..d1db583e5280 100644
--- a/lib/Driver/ToolChains/Arch/ARM.cpp
+++ b/lib/Driver/ToolChains/Arch/ARM.cpp
@@ -1,9 +1,8 @@
//===--- ARM.cpp - ARM (not AArch64) Helpers for Tools ----------*- C++ -*-===//
//
-// The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
@@ -73,15 +72,13 @@ static void getARMFPUFeatures(const Driver &D, const Arg *A,
// Decode ARM features from string like +[no]featureA+[no]featureB+...
static bool DecodeARMFeatures(const Driver &D, StringRef text,
+ StringRef CPU, llvm::ARM::ArchKind ArchKind,
std::vector<StringRef> &Features) {
SmallVector<StringRef, 8> Split;
text.split(Split, StringRef("+"), -1, false);
for (StringRef Feature : Split) {
- StringRef FeatureName = llvm::ARM::getArchExtFeature(Feature);
- if (!FeatureName.empty())
- Features.push_back(FeatureName);
- else
+ if (!appendArchExtFeatures(CPU, ArchKind, Feature, Features))
return false;
}
return true;
@@ -89,6 +86,7 @@ static bool DecodeARMFeatures(const Driver &D, StringRef text,
static void DecodeARMFeaturesFromCPU(const Driver &D, StringRef CPU,
std::vector<StringRef> &Features) {
+ CPU = CPU.split("+").first;
if (CPU != "generic") {
llvm::ARM::ArchKind ArchKind = llvm::ARM::parseCPUArch(CPU);
unsigned Extension = llvm::ARM::getDefaultExtensions(CPU, ArchKind);
@@ -100,14 +98,16 @@ static void DecodeARMFeaturesFromCPU(const Driver &D, StringRef CPU,
// getARMArch is used here instead of just checking the -march value in order
// to handle -march=native correctly.
static void checkARMArchName(const Driver &D, const Arg *A, const ArgList &Args,
- llvm::StringRef ArchName,
+ llvm::StringRef ArchName, llvm::StringRef CPUName,
std::vector<StringRef> &Features,
const llvm::Triple &Triple) {
std::pair<StringRef, StringRef> Split = ArchName.split("+");
std::string MArch = arm::getARMArch(ArchName, Triple);
- if (llvm::ARM::parseArch(MArch) == llvm::ARM::ArchKind::INVALID ||
- (Split.second.size() && !DecodeARMFeatures(D, Split.second, Features)))
+ llvm::ARM::ArchKind ArchKind = llvm::ARM::parseArch(MArch);
+ if (ArchKind == llvm::ARM::ArchKind::INVALID ||
+ (Split.second.size() && !DecodeARMFeatures(
+ D, Split.second, CPUName, ArchKind, Features)))
D.Diag(clang::diag::err_drv_clang_unsupported) << A->getAsString(Args);
}
@@ -119,8 +119,11 @@ static void checkARMCPUName(const Driver &D, const Arg *A, const ArgList &Args,
std::pair<StringRef, StringRef> Split = CPUName.split("+");
std::string CPU = arm::getARMTargetCPU(CPUName, ArchName, Triple);
- if (arm::getLLVMArchSuffixForARM(CPU, ArchName, Triple).empty() ||
- (Split.second.size() && !DecodeARMFeatures(D, Split.second, Features)))
+ llvm::ARM::ArchKind ArchKind =
+ arm::getLLVMArchKindForARM(CPU, ArchName, Triple);
+ if (ArchKind == llvm::ARM::ArchKind::INVALID ||
+ (Split.second.size() && !DecodeARMFeatures(
+ D, Split.second, CPU, ArchKind, Features)))
D.Diag(clang::diag::err_drv_clang_unsupported) << A->getAsString(Args);
}
@@ -249,7 +252,7 @@ arm::FloatABI arm::getARMFloatABI(const ToolChain &TC, const ArgList &Args) {
ABI = FloatABI::SoftFP;
break;
case llvm::Triple::Android:
- ABI = (SubArch == 7) ? FloatABI::SoftFP : FloatABI::Soft;
+ ABI = (SubArch >= 7) ? FloatABI::SoftFP : FloatABI::Soft;
break;
default:
// Assume "soft", but warn the user we are guessing.
@@ -286,6 +289,13 @@ void arm::getARMTargetFeatures(const ToolChain &TC,
const Arg *WaCPU = nullptr, *WaFPU = nullptr;
const Arg *WaHDiv = nullptr, *WaArch = nullptr;
+ // This vector will accumulate features from the architecture
+ // extension suffixes on -mcpu and -march (e.g. the 'bar' in
+ // -mcpu=foo+bar). We want to apply those after the features derived
+ // from the FPU, in case -mfpu generates a negative feature which
+ // the +bar is supposed to override.
+ std::vector<StringRef> ExtensionFeatures;
+
if (!ForAS) {
// FIXME: Note, this is a hack, the LLVM backend doesn't actually use these
// yet (it uses the -mfloat-abi and -msoft-float options), and it is
@@ -327,34 +337,35 @@ void arm::getARMTargetFeatures(const ToolChain &TC,
if (ThreadPointer == arm::ReadTPMode::Cp15)
Features.push_back("+read-tp-hard");
- // Check -march. ClangAs gives preference to -Wa,-march=.
const Arg *ArchArg = Args.getLastArg(options::OPT_march_EQ);
+ const Arg *CPUArg = Args.getLastArg(options::OPT_mcpu_EQ);
StringRef ArchName;
+ StringRef CPUName;
+
+ // Check -mcpu. ClangAs gives preference to -Wa,-mcpu=.
+ if (WaCPU) {
+ if (CPUArg)
+ D.Diag(clang::diag::warn_drv_unused_argument)
+ << CPUArg->getAsString(Args);
+ CPUName = StringRef(WaCPU->getValue()).substr(6);
+ CPUArg = WaCPU;
+ } else if (CPUArg)
+ CPUName = CPUArg->getValue();
+
+ // Check -march. ClangAs gives preference to -Wa,-march=.
if (WaArch) {
if (ArchArg)
D.Diag(clang::diag::warn_drv_unused_argument)
<< ArchArg->getAsString(Args);
ArchName = StringRef(WaArch->getValue()).substr(7);
- checkARMArchName(D, WaArch, Args, ArchName, Features, Triple);
+ checkARMArchName(D, WaArch, Args, ArchName, CPUName,
+ ExtensionFeatures, Triple);
// FIXME: Set Arch.
D.Diag(clang::diag::warn_drv_unused_argument) << WaArch->getAsString(Args);
} else if (ArchArg) {
ArchName = ArchArg->getValue();
- checkARMArchName(D, ArchArg, Args, ArchName, Features, Triple);
- }
-
- // Check -mcpu. ClangAs gives preference to -Wa,-mcpu=.
- const Arg *CPUArg = Args.getLastArg(options::OPT_mcpu_EQ);
- StringRef CPUName;
- if (WaCPU) {
- if (CPUArg)
- D.Diag(clang::diag::warn_drv_unused_argument)
- << CPUArg->getAsString(Args);
- CPUName = StringRef(WaCPU->getValue()).substr(6);
- checkARMCPUName(D, WaCPU, Args, CPUName, ArchName, Features, Triple);
- } else if (CPUArg) {
- CPUName = CPUArg->getValue();
- checkARMCPUName(D, CPUArg, Args, CPUName, ArchName, Features, Triple);
+ checkARMArchName(D, ArchArg, Args, ArchName, CPUName,
+ ExtensionFeatures, Triple);
}
// Add CPU features for generic CPUs
@@ -365,9 +376,16 @@ void arm::getARMTargetFeatures(const ToolChain &TC,
Features.push_back(
Args.MakeArgString((F.second ? "+" : "-") + F.first()));
} else if (!CPUName.empty()) {
+ // This sets the default features for the specified CPU. We certainly don't
+ // want to override the features that have been explicitly specified on the
+ // command line. Therefore, process them directly instead of appending them
+ // at the end later.
DecodeARMFeaturesFromCPU(D, CPUName, Features);
}
+ if (CPUArg)
+ checkARMCPUName(D, CPUArg, Args, CPUName, ArchName,
+ ExtensionFeatures, Triple);
// Honor -mfpu=. ClangAs gives preference to -Wa,-mfpu=.
const Arg *FPUArg = Args.getLastArg(options::OPT_mfpu_EQ);
if (WaFPU) {
@@ -379,14 +397,18 @@ void arm::getARMTargetFeatures(const ToolChain &TC,
} else if (FPUArg) {
getARMFPUFeatures(D, FPUArg, Args, FPUArg->getValue(), Features);
} else if (Triple.isAndroid() && getARMSubArchVersionNumber(Triple) >= 7) {
- // Android mandates minimum FPU requirements based on OS version.
- const char *AndroidFPU =
- Triple.isAndroidVersionLT(23) ? "vfpv3-d16" : "neon";
+ const char *AndroidFPU = "neon";
if (!llvm::ARM::getFPUFeatures(llvm::ARM::parseFPU(AndroidFPU), Features))
D.Diag(clang::diag::err_drv_clang_unsupported)
<< std::string("-mfpu=") + AndroidFPU;
}
+ // Now we've finished accumulating features from arch, cpu and fpu,
+ // we can append the ones for architecture extensions that we
+ // collected separately.
+ Features.insert(std::end(Features),
+ std::begin(ExtensionFeatures), std::end(ExtensionFeatures));
+
// Honor -mhwdiv=. ClangAs gives preference to -Wa,-mhwdiv=.
const Arg *HDivArg = Args.getLastArg(options::OPT_mhwdiv_EQ);
if (WaHDiv) {
@@ -431,16 +453,20 @@ fp16_fml_fallthrough:
if (ABI == arm::FloatABI::Soft) {
llvm::ARM::getFPUFeatures(llvm::ARM::FK_NONE, Features);
- // Disable hardware FP features which have been enabled.
- // FIXME: Disabling vfp2 and neon should be enough as all the other
- // features are dependent on these 2 features in LLVM. However
+ // Disable all features relating to hardware FP.
+ // FIXME: Disabling fpregs should be enough all by itself, since all
+ // the other FP features are dependent on it. However
// there is currently no easy way to test this in clang, so for
// now just be explicit and disable all known dependent features
// as well.
- for (std::string Feature : {"vfp2", "vfp3", "vfp4", "fp-armv8", "fullfp16",
- "neon", "crypto", "dotprod", "fp16fml"})
- if (std::find(std::begin(Features), std::end(Features), "+" + Feature) != std::end(Features))
- Features.push_back(Args.MakeArgString("-" + Feature));
+ for (std::string Feature : {
+ "vfp2", "vfp2sp", "vfp2d16", "vfp2d16sp",
+ "vfp3", "vfp3sp", "vfp3d16", "vfp3d16sp",
+ "vfp4", "vfp4sp", "vfp4d16", "vfp4d16sp",
+ "fp-armv8", "fp-armv8sp", "fp-armv8d16", "fp-armv8d16sp",
+ "fullfp16", "neon", "crypto", "dotprod", "fp16fml",
+ "fp64", "d32", "fpregs"})
+ Features.push_back(Args.MakeArgString("-" + Feature));
}
// En/disable crc code generation.
@@ -471,6 +497,10 @@ fp16_fml_fallthrough:
}
}
+ // CMSE: Check for target 8M (for -mcmse to be applicable) is performed later.
+ if (Args.getLastArg(options::OPT_mcmse))
+ Features.push_back("+8msecext");
+
// Look for the last occurrence of -mlong-calls or -mno-long-calls. If
// neither options are specified, see if we are compiling for kernel/kext and
// decide whether to pass "+long-calls" based on the OS and its version.
@@ -618,11 +648,12 @@ std::string arm::getARMTargetCPU(StringRef CPU, StringRef Arch,
return getARMCPUForMArch(Arch, Triple);
}
-/// getLLVMArchSuffixForARM - Get the LLVM arch name to use for a particular
-/// CPU (or Arch, if CPU is generic).
-// FIXME: This is redundant with -mcpu, why does LLVM use this.
-StringRef arm::getLLVMArchSuffixForARM(StringRef CPU, StringRef Arch,
- const llvm::Triple &Triple) {
+/// getLLVMArchSuffixForARM - Get the LLVM ArchKind value to use for a
+/// particular CPU (or Arch, if CPU is generic). This is needed to
+/// pass to functions like llvm::ARM::getDefaultFPU which need an
+/// ArchKind as well as a CPU name.
+llvm::ARM::ArchKind arm::getLLVMArchKindForARM(StringRef CPU, StringRef Arch,
+ const llvm::Triple &Triple) {
llvm::ARM::ArchKind ArchKind;
if (CPU == "generic") {
std::string ARMArch = tools::arm::getARMArch(Arch, Triple);
@@ -638,6 +669,15 @@ StringRef arm::getLLVMArchSuffixForARM(StringRef CPU, StringRef Arch,
? llvm::ARM::ArchKind::ARMV7K
: llvm::ARM::parseCPUArch(CPU);
}
+ return ArchKind;
+}
+
+/// getLLVMArchSuffixForARM - Get the LLVM arch name to use for a particular
+/// CPU (or Arch, if CPU is generic).
+// FIXME: This is redundant with -mcpu, why does LLVM use this.
+StringRef arm::getLLVMArchSuffixForARM(StringRef CPU, StringRef Arch,
+ const llvm::Triple &Triple) {
+ llvm::ARM::ArchKind ArchKind = getLLVMArchKindForARM(CPU, Arch, Triple);
if (ArchKind == llvm::ARM::ArchKind::INVALID)
return "";
return llvm::ARM::getSubArch(ArchKind);
generated by cgit v1.2.3 (git 2.25.1) at 2025-10-05 14:45:17 +0000