Chris Lattner | 9690979 | 2006-01-28 05:40:47 +0000 | [diff] [blame] | 1 | //===- PowerPCSubtarget.cpp - PPC Subtarget Information -------------------===// |
Nate Begeman | 8c00f8c | 2005-08-04 07:12:09 +0000 | [diff] [blame] | 2 | // |
| 3 | // The LLVM Compiler Infrastructure |
| 4 | // |
Chris Lattner | 4ee451d | 2007-12-29 20:36:04 +0000 | [diff] [blame] | 5 | // This file is distributed under the University of Illinois Open Source |
| 6 | // License. See LICENSE.TXT for details. |
Nate Begeman | 8c00f8c | 2005-08-04 07:12:09 +0000 | [diff] [blame] | 7 | // |
| 8 | //===----------------------------------------------------------------------===// |
| 9 | // |
| 10 | // This file implements the PPC specific subclass of TargetSubtarget. |
| 11 | // |
| 12 | //===----------------------------------------------------------------------===// |
| 13 | |
Chris Lattner | 2668959 | 2005-10-14 23:51:18 +0000 | [diff] [blame] | 14 | #include "PPCSubtarget.h" |
| 15 | #include "PPC.h" |
Daniel Dunbar | 3be0340 | 2009-08-02 22:11:08 +0000 | [diff] [blame] | 16 | #include "llvm/GlobalValue.h" |
Chris Lattner | 57fc62c | 2006-12-11 23:22:45 +0000 | [diff] [blame] | 17 | #include "llvm/Target/TargetMachine.h" |
Jim Laskey | f5fc2cb | 2005-10-21 19:05:19 +0000 | [diff] [blame] | 18 | #include "PPCGenSubtarget.inc" |
Dan Gohman | d68a076 | 2009-01-05 17:59:02 +0000 | [diff] [blame] | 19 | #include <cstdlib> |
Chris Lattner | 3c304a3 | 2005-08-05 22:05:03 +0000 | [diff] [blame] | 20 | using namespace llvm; |
Chris Lattner | 3c304a3 | 2005-08-05 22:05:03 +0000 | [diff] [blame] | 21 | |
Nate Begeman | 8c00f8c | 2005-08-04 07:12:09 +0000 | [diff] [blame] | 22 | #if defined(__APPLE__) |
| 23 | #include <mach/mach.h> |
| 24 | #include <mach/mach_host.h> |
| 25 | #include <mach/host_info.h> |
| 26 | #include <mach/machine.h> |
| 27 | |
Jim Laskey | b1e1180 | 2005-09-01 21:38:21 +0000 | [diff] [blame] | 28 | /// GetCurrentPowerPCFeatures - Returns the current CPUs features. |
| 29 | static const char *GetCurrentPowerPCCPU() { |
Nate Begeman | 8c00f8c | 2005-08-04 07:12:09 +0000 | [diff] [blame] | 30 | host_basic_info_data_t hostInfo; |
| 31 | mach_msg_type_number_t infoCount; |
| 32 | |
| 33 | infoCount = HOST_BASIC_INFO_COUNT; |
| 34 | host_info(mach_host_self(), HOST_BASIC_INFO, (host_info_t)&hostInfo, |
| 35 | &infoCount); |
Jim Laskey | b1e1180 | 2005-09-01 21:38:21 +0000 | [diff] [blame] | 36 | |
| 37 | if (hostInfo.cpu_type != CPU_TYPE_POWERPC) return "generic"; |
| 38 | |
| 39 | switch(hostInfo.cpu_subtype) { |
| 40 | case CPU_SUBTYPE_POWERPC_601: return "601"; |
| 41 | case CPU_SUBTYPE_POWERPC_602: return "602"; |
| 42 | case CPU_SUBTYPE_POWERPC_603: return "603"; |
| 43 | case CPU_SUBTYPE_POWERPC_603e: return "603e"; |
| 44 | case CPU_SUBTYPE_POWERPC_603ev: return "603ev"; |
| 45 | case CPU_SUBTYPE_POWERPC_604: return "604"; |
| 46 | case CPU_SUBTYPE_POWERPC_604e: return "604e"; |
| 47 | case CPU_SUBTYPE_POWERPC_620: return "620"; |
| 48 | case CPU_SUBTYPE_POWERPC_750: return "750"; |
| 49 | case CPU_SUBTYPE_POWERPC_7400: return "7400"; |
| 50 | case CPU_SUBTYPE_POWERPC_7450: return "7450"; |
| 51 | case CPU_SUBTYPE_POWERPC_970: return "970"; |
| 52 | default: ; |
| 53 | } |
Nate Begeman | 8c00f8c | 2005-08-04 07:12:09 +0000 | [diff] [blame] | 54 | |
Jim Laskey | b1e1180 | 2005-09-01 21:38:21 +0000 | [diff] [blame] | 55 | return "generic"; |
| 56 | } |
Nate Begeman | 8c00f8c | 2005-08-04 07:12:09 +0000 | [diff] [blame] | 57 | #endif |
| 58 | |
Jim Laskey | 581a8f7 | 2005-10-26 17:30:34 +0000 | [diff] [blame] | 59 | |
Daniel Dunbar | 3be0340 | 2009-08-02 22:11:08 +0000 | [diff] [blame] | 60 | PPCSubtarget::PPCSubtarget(const std::string &TT, const std::string &FS, |
| 61 | bool is64Bit) |
| 62 | : StackAlignment(16) |
Dale Johannesen | db01c8b | 2008-02-14 23:35:16 +0000 | [diff] [blame] | 63 | , DarwinDirective(PPC::DIR_NONE) |
Jim Laskey | 581a8f7 | 2005-10-26 17:30:34 +0000 | [diff] [blame] | 64 | , IsGigaProcessor(false) |
Chris Lattner | a7a5854 | 2006-06-16 17:34:12 +0000 | [diff] [blame] | 65 | , Has64BitSupport(false) |
| 66 | , Use64BitRegs(false) |
Chris Lattner | 7c1fb5f | 2006-06-16 17:50:12 +0000 | [diff] [blame] | 67 | , IsPPC64(is64Bit) |
Jim Laskey | 581a8f7 | 2005-10-26 17:30:34 +0000 | [diff] [blame] | 68 | , HasAltivec(false) |
| 69 | , HasFSQRT(false) |
Chris Lattner | 5126984 | 2006-03-01 05:50:56 +0000 | [diff] [blame] | 70 | , HasSTFIWX(false) |
Chris Lattner | 564da5d | 2008-01-02 19:35:16 +0000 | [diff] [blame] | 71 | , HasLazyResolverStubs(false) |
| 72 | , DarwinVers(0) { |
Chris Lattner | 3c304a3 | 2005-08-05 22:05:03 +0000 | [diff] [blame] | 73 | |
Jim Laskey | b1e1180 | 2005-09-01 21:38:21 +0000 | [diff] [blame] | 74 | // Determine default and user specified characteristics |
Chris Lattner | c98d823 | 2005-09-07 05:45:33 +0000 | [diff] [blame] | 75 | std::string CPU = "generic"; |
Jim Laskey | b1e1180 | 2005-09-01 21:38:21 +0000 | [diff] [blame] | 76 | #if defined(__APPLE__) |
| 77 | CPU = GetCurrentPowerPCCPU(); |
| 78 | #endif |
Jim Laskey | 581a8f7 | 2005-10-26 17:30:34 +0000 | [diff] [blame] | 79 | |
| 80 | // Parse features string. |
| 81 | ParseSubtargetFeatures(FS, CPU); |
Jim Laskey | b1e1180 | 2005-09-01 21:38:21 +0000 | [diff] [blame] | 82 | |
Chris Lattner | 7c1fb5f | 2006-06-16 17:50:12 +0000 | [diff] [blame] | 83 | // If we are generating code for ppc64, verify that options make sense. |
| 84 | if (is64Bit) { |
Dale Johannesen | 3b40744 | 2008-02-15 18:40:53 +0000 | [diff] [blame] | 85 | Has64BitSupport = true; |
Chris Lattner | 8fa05da | 2006-06-16 20:05:06 +0000 | [diff] [blame] | 86 | // Silently force 64-bit register use on ppc64. |
| 87 | Use64BitRegs = true; |
Chris Lattner | 7c1fb5f | 2006-06-16 17:50:12 +0000 | [diff] [blame] | 88 | } |
| 89 | |
| 90 | // If the user requested use of 64-bit regs, but the cpu selected doesn't |
Dale Johannesen | 3b40744 | 2008-02-15 18:40:53 +0000 | [diff] [blame] | 91 | // support it, ignore. |
| 92 | if (use64BitRegs() && !has64BitSupport()) |
Chris Lattner | 7c1fb5f | 2006-06-16 17:50:12 +0000 | [diff] [blame] | 93 | Use64BitRegs = false; |
Chris Lattner | 7c1fb5f | 2006-06-16 17:50:12 +0000 | [diff] [blame] | 94 | |
Jim Laskey | b1e1180 | 2005-09-01 21:38:21 +0000 | [diff] [blame] | 95 | // Set the boolean corresponding to the current target triple, or the default |
Nate Begeman | 8c00f8c | 2005-08-04 07:12:09 +0000 | [diff] [blame] | 96 | // if one cannot be determined, to true. |
Chris Lattner | 564da5d | 2008-01-02 19:35:16 +0000 | [diff] [blame] | 97 | if (TT.length() > 7) { |
| 98 | // Determine which version of darwin this is. |
Duncan Sands | e51775d | 2008-01-08 10:06:15 +0000 | [diff] [blame] | 99 | size_t DarwinPos = TT.find("-darwin"); |
Chris Lattner | 564da5d | 2008-01-02 19:35:16 +0000 | [diff] [blame] | 100 | if (DarwinPos != std::string::npos) { |
| 101 | if (isdigit(TT[DarwinPos+7])) |
| 102 | DarwinVers = atoi(&TT[DarwinPos+7]); |
| 103 | else |
| 104 | DarwinVers = 8; // Minimum supported darwin is Tiger. |
| 105 | } |
Nate Begeman | 8c00f8c | 2005-08-04 07:12:09 +0000 | [diff] [blame] | 106 | } |
Chris Lattner | 57fc62c | 2006-12-11 23:22:45 +0000 | [diff] [blame] | 107 | |
| 108 | // Set up darwin-specific properties. |
Chris Lattner | 74da671 | 2009-08-11 22:49:34 +0000 | [diff] [blame] | 109 | if (isDarwin()) |
Chris Lattner | 57fc62c | 2006-12-11 23:22:45 +0000 | [diff] [blame] | 110 | HasLazyResolverStubs = true; |
Chris Lattner | 57fc62c | 2006-12-11 23:22:45 +0000 | [diff] [blame] | 111 | } |
| 112 | |
| 113 | /// SetJITMode - This is called to inform the subtarget info that we are |
| 114 | /// producing code for the JIT. |
| 115 | void PPCSubtarget::SetJITMode() { |
| 116 | // JIT mode doesn't want lazy resolver stubs, it knows exactly where |
| 117 | // everything is. This matters for PPC64, which codegens in PIC mode without |
| 118 | // stubs. |
| 119 | HasLazyResolverStubs = false; |
| 120 | } |
| 121 | |
| 122 | |
| 123 | /// hasLazyResolverStub - Return true if accesses to the specified global have |
| 124 | /// to go through a dyld lazy resolution stub. This means that an extra load |
| 125 | /// is required to get the address of the global. |
Daniel Dunbar | 3be0340 | 2009-08-02 22:11:08 +0000 | [diff] [blame] | 126 | bool PPCSubtarget::hasLazyResolverStub(const GlobalValue *GV, |
| 127 | const TargetMachine &TM) const { |
Chris Lattner | 57fc62c | 2006-12-11 23:22:45 +0000 | [diff] [blame] | 128 | // We never hae stubs if HasLazyResolverStubs=false or if in static mode. |
| 129 | if (!HasLazyResolverStubs || TM.getRelocationModel() == Reloc::Static) |
| 130 | return false; |
Evan Cheng | ae94e59 | 2008-12-05 01:06:39 +0000 | [diff] [blame] | 131 | // If symbol visibility is hidden, the extra load is not needed if |
| 132 | // the symbol is definitely defined in the current translation unit. |
| 133 | bool isDecl = GV->isDeclaration() && !GV->hasNotBeenReadFromBitcode(); |
| 134 | if (GV->hasHiddenVisibility() && !isDecl && !GV->hasCommonLinkage()) |
| 135 | return false; |
Chris Lattner | 57fc62c | 2006-12-11 23:22:45 +0000 | [diff] [blame] | 136 | return GV->hasWeakLinkage() || GV->hasLinkOnceLinkage() || |
Evan Cheng | ae94e59 | 2008-12-05 01:06:39 +0000 | [diff] [blame] | 137 | GV->hasCommonLinkage() || isDecl; |
Nate Begeman | 8c00f8c | 2005-08-04 07:12:09 +0000 | [diff] [blame] | 138 | } |