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ARM: Add Performance Monitor Extensions feature

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Performance monitors, including a basic cycle counter, are an official
extension in the ARMv7 specification. This adds support for enabling and
disabling them, orthogonally from CPU selection.

rdar://problem/13939186

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@182602 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Tim Northover 2013-05-23 19:11:14 +00:00
parent d078070f6a
commit b94a353242
3 changed files with 10 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
lib/Target/ARM/ARM.td
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@ -59,6 +59,8 @@ def FeatureSlowFPBrcc : SubtargetFeature<"slow-fp-brcc", "SlowFPBrcc", "true",
"FP compare + branch is slow">;
def FeatureVFPOnlySP : SubtargetFeature<"fp-only-sp", "FPOnlySP", "true",
"Floating point unit supports single precision only">;
def FeaturePerfMon : SubtargetFeature<"perfmon", "HasPerfMon", "true",
"Enable support for Performance Monitor extensions">;
def FeatureTrustZone : SubtargetFeature<"trustzone", "HasTrustZone", "true",
"Enable support for TrustZone security extensions">;
@ -134,7 +136,7 @@ def HasV6T2Ops : SubtargetFeature<"v6t2", "HasV6T2Ops", "true",
[HasV6Ops, FeatureThumb2]>;
def HasV7Ops : SubtargetFeature<"v7", "HasV7Ops", "true",
"Support ARM v7 instructions",
[HasV6T2Ops]>;
[HasV6T2Ops, FeaturePerfMon]>;
//===----------------------------------------------------------------------===//
// ARM Processors supported.

1
lib/Target/ARM/ARMSubtarget.cpp
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@ -106,6 +106,7 @@ void ARMSubtarget::initializeEnvironment() {
HasRAS = false;
HasMPExtension = false;
FPOnlySP = false;
HasPerfMon = false;
HasTrustZone = false;
AllowsUnalignedMem = false;
Thumb2DSP = false;

6
lib/Target/ARM/ARMSubtarget.h
View File

@ -148,6 +148,11 @@ protected:
/// precision.
bool FPOnlySP;
/// If true, the processor supports the Performance Monitor Extensions. These
/// include a generic cycle-counter as well as more fine-grained (often
/// implementation-specific) events.
bool HasPerfMon;
/// HasTrustZone - if true, processor supports TrustZone security extensions
bool HasTrustZone;
@ -254,6 +259,7 @@ public:
bool hasVMLxForwarding() const { return HasVMLxForwarding; }
bool isFPBrccSlow() const { return SlowFPBrcc; }
bool isFPOnlySP() const { return FPOnlySP; }
bool hasPerfMon() const { return HasPerfMon; }
bool hasTrustZone() const { return HasTrustZone; }
bool prefers32BitThumb() const { return Pref32BitThumb; }
bool avoidCPSRPartialUpdate() const { return AvoidCPSRPartialUpdate; }