[llvm] r329856 - [LLVM-C] Add LLVMGetHostCPU{Name,Features}.
whitequark via llvm-commits
llvm-commits at lists.llvm.org
Wed Apr 11 15:40:43 PDT 2018
Author: whitequark
Date: Wed Apr 11 15:40:42 2018
New Revision: 329856
URL: http://llvm.org/viewvc/llvm-project?rev=329856&view=rev
Log:
[LLVM-C] Add LLVMGetHostCPU{Name,Features}.
Without these functions it's hard to create a TargetMachine for
Orc JIT that creates efficient native code.
It's not sufficient to just expose LLVMGetHostCPUName(), because
for some CPUs there's fewer features actually available than
the CPU name indicates (e.g. AVX might be missing on some CPUs
identified as Skylake).
Differential Revision: https://reviews.llvm.org/D44861
Modified:
llvm/trunk/include/llvm-c/TargetMachine.h
llvm/trunk/lib/Target/TargetMachineC.cpp
Modified: llvm/trunk/include/llvm-c/TargetMachine.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm-c/TargetMachine.h?rev=329856&r1=329855&r2=329856&view=diff
==============================================================================
--- llvm/trunk/include/llvm-c/TargetMachine.h (original)
+++ llvm/trunk/include/llvm-c/TargetMachine.h Wed Apr 11 15:40:42 2018
@@ -137,6 +137,14 @@ LLVMBool LLVMTargetMachineEmitToMemoryBu
disposed with LLVMDisposeMessage. */
char* LLVMGetDefaultTargetTriple(void);
+/** Get the host CPU as a string. The result needs to be disposed with
+ LLVMDisposeMessage. */
+char* LLVMGetHostCPUName(void);
+
+/** Get the host CPU's features as a string. The result needs to be disposed
+ with LLVMDisposeMessage. */
+char* LLVMGetHostCPUFeatures(void);
+
/** Adds the target-specific analysis passes to the pass manager. */
void LLVMAddAnalysisPasses(LLVMTargetMachineRef T, LLVMPassManagerRef PM);
Modified: llvm/trunk/lib/Target/TargetMachineC.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/TargetMachineC.cpp?rev=329856&r1=329855&r2=329856&view=diff
==============================================================================
--- llvm/trunk/lib/Target/TargetMachineC.cpp (original)
+++ llvm/trunk/lib/Target/TargetMachineC.cpp Wed Apr 11 15:40:42 2018
@@ -18,6 +18,7 @@
#include "llvm/IR/DataLayout.h"
#include "llvm/IR/LegacyPassManager.h"
#include "llvm/IR/Module.h"
+#include "llvm/MC/SubtargetFeature.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/FormattedStream.h"
#include "llvm/Support/Host.h"
@@ -237,6 +238,21 @@ char *LLVMGetDefaultTargetTriple(void) {
return strdup(sys::getDefaultTargetTriple().c_str());
}
+char *LLVMGetHostCPUName(void) {
+ return strdup(sys::getHostCPUName().data());
+}
+
+char *LLVMGetHostCPUFeatures(void) {
+ SubtargetFeatures Features;
+ StringMap<bool> HostFeatures;
+
+ if (sys::getHostCPUFeatures(HostFeatures))
+ for (auto &F : HostFeatures)
+ Features.AddFeature(F.first(), F.second);
+
+ return strdup(Features.getString().c_str());
+}
+
void LLVMAddAnalysisPasses(LLVMTargetMachineRef T, LLVMPassManagerRef PM) {
unwrap(PM)->add(
createTargetTransformInfoWrapperPass(unwrap(T)->getTargetIRAnalysis()));
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