It's not necessary to do rounding for alloca operations when the requested
alignment is equal to the stack alignment.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@40004 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/PowerPC/PPCSubtarget.h b/lib/Target/PowerPC/PPCSubtarget.h
new file mode 100644
index 0000000..d1e135c
--- /dev/null
+++ b/lib/Target/PowerPC/PPCSubtarget.h
@@ -0,0 +1,146 @@
+//=====-- PPCSubtarget.h - Define Subtarget for the PPC -------*- C++ -*--====//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file was developed by Nate Begeman and is distributed under the
+// University of Illinois Open Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file declares the PowerPC specific subclass of TargetSubtarget.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef POWERPCSUBTARGET_H
+#define POWERPCSUBTARGET_H
+
+#include "llvm/Target/TargetInstrItineraries.h"
+#include "llvm/Target/TargetSubtarget.h"
+
+#include <string>
+
+// GCC #defines PPC on Linux but we use it as our namespace name
+#undef PPC
+
+namespace llvm {
+
+namespace PPC {
+ // -m directive values.
+ enum {
+ DIR_32,
+ DIR_601,
+ DIR_602,
+ DIR_603,
+ DIR_7400,
+ DIR_750,
+ DIR_970,
+ DIR_64
+ };
+}
+
+class Module;
+class GlobalValue;
+class TargetMachine;
+
+class PPCSubtarget : public TargetSubtarget {
+public:
+ enum AsmWriterFlavorTy {
+ OldMnemonic, NewMnemonic, Unset
+ };
+protected:
+ const TargetMachine &TM;
+
+ /// stackAlignment - The minimum alignment known to hold of the stack frame on
+ /// entry to the function and which must be maintained by every function.
+ unsigned StackAlignment;
+
+ /// Selected instruction itineraries (one entry per itinerary class.)
+ InstrItineraryData InstrItins;
+
+ /// Which cpu directive was used.
+ unsigned DarwinDirective;
+
+ /// AsmFlavor - Which PPC asm dialect to use.
+ AsmWriterFlavorTy AsmFlavor;
+
+ /// Used by the ISel to turn in optimizations for POWER4-derived architectures
+ bool IsGigaProcessor;
+ bool Has64BitSupport;
+ bool Use64BitRegs;
+ bool IsPPC64;
+ bool HasAltivec;
+ bool HasFSQRT;
+ bool HasSTFIWX;
+ bool IsDarwin;
+ bool HasLazyResolverStubs;
+public:
+ /// This constructor initializes the data members to match that
+ /// of the specified module.
+ ///
+ PPCSubtarget(const TargetMachine &TM, const Module &M,
+ const std::string &FS, bool is64Bit);
+
+ /// ParseSubtargetFeatures - Parses features string setting specified
+ /// subtarget options. Definition of function is auto generated by tblgen.
+ void ParseSubtargetFeatures(const std::string &FS, const std::string &CPU);
+
+ /// SetJITMode - This is called to inform the subtarget info that we are
+ /// producing code for the JIT.
+ void SetJITMode();
+
+ /// getStackAlignment - Returns the minimum alignment known to hold of the
+ /// stack frame on entry to the function and which must be maintained by every
+ /// function for this subtarget.
+ unsigned getStackAlignment() const { return StackAlignment; }
+
+ /// getDarwinDirective - Returns the -m directive specified for the cpu.
+ ///
+ unsigned getDarwinDirective() const { return DarwinDirective; }
+
+ /// getInstrItins - Return the instruction itineraies based on subtarget
+ /// selection.
+ const InstrItineraryData &getInstrItineraryData() const { return InstrItins; }
+
+ /// getTargetDataString - Return the pointer size and type alignment
+ /// properties of this subtarget.
+ const char *getTargetDataString() const {
+ return isPPC64() ? "E-p:64:64-f64:32:64-i64:32:64"
+ : "E-p:32:32-f64:32:64-i64:32:64";
+ }
+
+ /// isPPC64 - Return true if we are generating code for 64-bit pointer mode.
+ ///
+ bool isPPC64() const { return IsPPC64; }
+
+ /// has64BitSupport - Return true if the selected CPU supports 64-bit
+ /// instructions, regardless of whether we are in 32-bit or 64-bit mode.
+ bool has64BitSupport() const { return Has64BitSupport; }
+
+ /// use64BitRegs - Return true if in 64-bit mode or if we should use 64-bit
+ /// registers in 32-bit mode when possible. This can only true if
+ /// has64BitSupport() returns true.
+ bool use64BitRegs() const { return Use64BitRegs; }
+
+ /// hasLazyResolverStub - Return true if accesses to the specified global have
+ /// to go through a dyld lazy resolution stub. This means that an extra load
+ /// is required to get the address of the global.
+ bool hasLazyResolverStub(const GlobalValue *GV) const;
+
+ // Specific obvious features.
+ bool hasFSQRT() const { return HasFSQRT; }
+ bool hasSTFIWX() const { return HasSTFIWX; }
+ bool hasAltivec() const { return HasAltivec; }
+ bool isGigaProcessor() const { return IsGigaProcessor; }
+
+ bool isDarwin() const { return IsDarwin; }
+
+ bool isMachoABI() const { return IsDarwin || IsPPC64; }
+ bool isELF32_ABI() const { return !IsDarwin && !IsPPC64; }
+
+ unsigned getAsmFlavor() const {
+ return AsmFlavor != Unset ? unsigned(AsmFlavor) : 0;
+ }
+};
+} // End llvm namespace
+
+#endif