jdk8-mips64-public/hotspot: src/cpu/ppc/vm/vm_version

src/cpu/ppc/vm/vm_version_ppc.cpp@41b780b43b74 (annotated)

src/cpu/ppc/vm/vm_version_ppc.cpp

Wed, 27 Nov 2013 16:16:21 -0800

author: goetz
date: Wed, 27 Nov 2013 16:16:21 -0800
changeset 6490: 41b780b43b74
parent 6458: ec28f9c041ff
child 6495: 67fa91961822
permissions: -rw-r--r--

8029015: PPC64 (part 216): opto: trap based null and range checks
Summary: On PPC64 use tdi instruction that does a compare and raises SIGTRAP for NULL and range checks.
Reviewed-by: kvn

 /*
  * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
  * Copyright 2012, 2013 SAP AG. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  *
  */
 #include "precompiled.hpp"
 #include "assembler_ppc.inline.hpp"
 #include "compiler/disassembler.hpp"
 #include "memory/resourceArea.hpp"
 #include "runtime/java.hpp"
 #include "runtime/stubCodeGenerator.hpp"
 #include "utilities/defaultStream.hpp"
 #include "vm_version_ppc.hpp"
 #ifdef TARGET_OS_FAMILY_aix
 # include "os_aix.inline.hpp"
 #endif
 #ifdef TARGET_OS_FAMILY_linux
 # include "os_linux.inline.hpp"
 #endif
 # include <sys/sysinfo.h>
 int VM_Version::_features = VM_Version::unknown_m;
 int VM_Version::_measured_cache_line_size = 128; // default value
 const char* VM_Version::_features_str = "";
 bool VM_Version::_is_determine_features_test_running = false;
 #define MSG(flag)   \
   if (flag && !FLAG_IS_DEFAULT(flag))                                  \
       jio_fprintf(defaultStream::error_stream(),                       \
                   "warning: -XX:+" #flag " requires -XX:+UseSIGTRAP\n" \
                   "         -XX:+" #flag " will be disabled!\n");
 void VM_Version::initialize() {
   // Test which instructions are supported and measure cache line size.
   determine_features();
   // If PowerArchitecturePPC64 hasn't been specified explicitly determine from features.
   if (FLAG_IS_DEFAULT(PowerArchitecturePPC64)) {
     if (VM_Version::has_popcntw()) {
       FLAG_SET_ERGO(uintx, PowerArchitecturePPC64, 7);
     } else if (VM_Version::has_cmpb()) {
       FLAG_SET_ERGO(uintx, PowerArchitecturePPC64, 6);
     } else if (VM_Version::has_popcntb()) {
       FLAG_SET_ERGO(uintx, PowerArchitecturePPC64, 5);
     } else {
       FLAG_SET_ERGO(uintx, PowerArchitecturePPC64, 0);
     }
   }
   guarantee(PowerArchitecturePPC64 == 0 || PowerArchitecturePPC64 == 5 ||
             PowerArchitecturePPC64 == 6 || PowerArchitecturePPC64 == 7,
             "PowerArchitecturePPC64 should be 0, 5, 6 or 7");
   if (!UseSIGTRAP) {
     MSG(TrapBasedICMissChecks);
     MSG(TrapBasedNotEntrantChecks);
     MSG(TrapBasedNullChecks);
     FLAG_SET_ERGO(bool, TrapBasedNotEntrantChecks, false);
     FLAG_SET_ERGO(bool, TrapBasedNullChecks,       false);
     FLAG_SET_ERGO(bool, TrapBasedICMissChecks,     false);
   }
 #ifdef COMPILER2
   if (!UseSIGTRAP) {
     MSG(TrapBasedRangeChecks);
     FLAG_SET_ERGO(bool, TrapBasedRangeChecks, false);
   }
   // On Power6 test for section size.
   if (PowerArchitecturePPC64 == 6)
     determine_section_size();
   // TODO: PPC port else
   // TODO: PPC port PdScheduling::power6SectorSize = 0x20;
   MaxVectorSize = 8;
 #endif
   // Create and print feature-string.
   char buf[(num_features+1) * 16]; // max 16 chars per feature
   jio_snprintf(buf, sizeof(buf),
                "ppc64%s%s%s%s%s%s%s%s",
                (has_fsqrt()   ? " fsqrt"   : ""),
                (has_isel()    ? " isel"    : ""),
                (has_lxarxeh() ? " lxarxeh" : ""),
                (has_cmpb()    ? " cmpb"    : ""),
                //(has_mftgpr()? " mftgpr"  : ""),
                (has_popcntb() ? " popcntb" : ""),
                (has_popcntw() ? " popcntw" : ""),
                (has_fcfids()  ? " fcfids"  : ""),
                (has_vand()    ? " vand"    : "")
                // Make sure number of %s matches num_features!
               );
   _features_str = strdup(buf);
   NOT_PRODUCT(if (Verbose) print_features(););
   // PPC64 supports 8-byte compare-exchange operations (see
   // Atomic::cmpxchg and StubGenerator::generate_atomic_cmpxchg_ptr)
   // and 'atomic long memory ops' (see Unsafe_GetLongVolatile).
   _supports_cx8 = true;
   UseSSE = 0; // Only on x86 and x64
   intx cache_line_size = _measured_cache_line_size;
   if (FLAG_IS_DEFAULT(AllocatePrefetchStyle)) AllocatePrefetchStyle = 1;
   if (AllocatePrefetchStyle == 4) {
     AllocatePrefetchStepSize = cache_line_size; // need exact value
     if (FLAG_IS_DEFAULT(AllocatePrefetchLines)) AllocatePrefetchLines = 12; // use larger blocks by default
     if (AllocatePrefetchDistance < 0) AllocatePrefetchDistance = 2*cache_line_size; // default is not defined ?
   } else {
     if (cache_line_size > AllocatePrefetchStepSize) AllocatePrefetchStepSize = cache_line_size;
     if (FLAG_IS_DEFAULT(AllocatePrefetchLines)) AllocatePrefetchLines = 3; // Optimistic value
     if (AllocatePrefetchDistance < 0) AllocatePrefetchDistance = 3*cache_line_size; // default is not defined ?
   }
   assert(AllocatePrefetchLines > 0, "invalid value");
   if (AllocatePrefetchLines < 1) // Set valid value in product VM.
     AllocatePrefetchLines = 1; // Conservative value
   if (AllocatePrefetchStyle == 3 && AllocatePrefetchDistance < cache_line_size)
     AllocatePrefetchStyle = 1; // fall back if inappropriate
   assert(AllocatePrefetchStyle >= 0, "AllocatePrefetchStyle should be positive");
 }
 void VM_Version::print_features() {
   tty->print_cr("Version: %s cache_line_size = %d", cpu_features(), get_cache_line_size());
 }
 #ifdef COMPILER2
 // Determine section size on power6: If section size is 8 instructions,
 // there should be a difference between the two testloops of ~15 %. If
 // no difference is detected the section is assumed to be 32 instructions.
 void VM_Version::determine_section_size() {
   int unroll = 80;
   const int code_size = (2* unroll * 32 + 100)*BytesPerInstWord;
   // Allocate space for the code
   ResourceMark rm;
   CodeBuffer cb("detect_section_size", code_size, 0);
   MacroAssembler* a = new MacroAssembler(&cb);
   uint32_t *code = (uint32_t *)a->pc();
   // emit code.
   void (*test1)() = (void(*)())(void *)a->emit_fd();
   Label l1;
   a->li(R4, 1);
   a->sldi(R4, R4, 28);
   a->b(l1);
   a->align(CodeEntryAlignment);
   a->bind(l1);
   for (int i = 0; i < unroll; i++) {
     // Schleife 1
     // ------- sector 0 ------------
     // ;; 0
     a->nop();                   // 1
     a->fpnop0();                // 2
     a->fpnop1();                // 3
     a->addi(R4,R4, -1); // 4
     // ;;  1
     a->nop();                   // 5
     a->fmr(F6, F6);     // 6
     a->fmr(F7, F7);     // 7
     a->endgroup();              // 8
     // ------- sector 8 ------------
     // ;;  2
     a->nop();                   // 9
     a->nop();                   // 10
     a->fmr(F8, F8);     // 11
     a->fmr(F9, F9);     // 12
     // ;;  3
     a->nop();                   // 13
     a->fmr(F10, F10);   // 14
     a->fmr(F11, F11);   // 15
     a->endgroup();              // 16
     // -------- sector 16 -------------
     // ;;  4
     a->nop();                   // 17
     a->nop();                   // 18
     a->fmr(F15, F15);   // 19
     a->fmr(F16, F16);   // 20
     // ;;  5
     a->nop();                   // 21
     a->fmr(F17, F17);   // 22
     a->fmr(F18, F18);   // 23
     a->endgroup();              // 24
     // ------- sector 24  ------------
     // ;;  6
     a->nop();                   // 25
     a->nop();                   // 26
     a->fmr(F19, F19);     // 27
     a->fmr(F20, F20);     // 28
     // ;;  7
     a->nop();                   // 29
     a->fmr(F21, F21);   // 30
     a->fmr(F22, F22);   // 31
     a->brnop0();                // 32
     // ------- sector 32 ------------
   }
   // ;; 8
   a->cmpdi(CCR0, R4, unroll);// 33
   a->bge(CCR0, l1);         // 34
   a->blr();
   // emit code.
   void (*test2)() = (void(*)())(void *)a->emit_fd();
   // uint32_t *code = (uint32_t *)a->pc();
   Label l2;
   a->li(R4, 1);
   a->sldi(R4, R4, 28);
   a->b(l2);
   a->align(CodeEntryAlignment);
   a->bind(l2);
   for (int i = 0; i < unroll; i++) {
     // Schleife 2
     // ------- sector 0 ------------
     // ;; 0
     a->brnop0();                  // 1
     a->nop();                     // 2
     //a->cmpdi(CCR0, R4, unroll);
     a->fpnop0();                  // 3
     a->fpnop1();                  // 4
     a->addi(R4,R4, -1);           // 5
     // ;; 1
     a->nop();                     // 6
     a->fmr(F6, F6);               // 7
     a->fmr(F7, F7);               // 8
     // ------- sector 8 ---------------
     // ;; 2
     a->endgroup();                // 9
     // ;; 3
     a->nop();                     // 10
     a->nop();                     // 11
     a->fmr(F8, F8);               // 12
     // ;; 4
     a->fmr(F9, F9);               // 13
     a->nop();                     // 14
     a->fmr(F10, F10);             // 15
     // ;; 5
     a->fmr(F11, F11);             // 16
     // -------- sector 16 -------------
     // ;; 6
     a->endgroup();                // 17
     // ;; 7
     a->nop();                     // 18
     a->nop();                     // 19
     a->fmr(F15, F15);             // 20
     // ;; 8
     a->fmr(F16, F16);             // 21
     a->nop();                     // 22
     a->fmr(F17, F17);             // 23
     // ;; 9
     a->fmr(F18, F18);             // 24
     // -------- sector 24 -------------
     // ;; 10
     a->endgroup();                // 25
     // ;; 11
     a->nop();                     // 26
     a->nop();                     // 27
     a->fmr(F19, F19);             // 28
     // ;; 12
     a->fmr(F20, F20);             // 29
     a->nop();                     // 30
     a->fmr(F21, F21);             // 31
     // ;; 13
     a->fmr(F22, F22);             // 32
   }
   // -------- sector 32 -------------
   // ;; 14
   a->cmpdi(CCR0, R4, unroll); // 33
   a->bge(CCR0, l2);           // 34
   a->blr();
   uint32_t *code_end = (uint32_t *)a->pc();
   a->flush();
   double loop1_seconds,loop2_seconds, rel_diff;
   uint64_t start1, stop1;
   start1 = os::current_thread_cpu_time(false);
   (*test1)();
   stop1 = os::current_thread_cpu_time(false);
   loop1_seconds = (stop1- start1) / (1000 *1000 *1000.0);
   start1 = os::current_thread_cpu_time(false);
   (*test2)();
   stop1 = os::current_thread_cpu_time(false);
   loop2_seconds = (stop1 - start1) / (1000 *1000 *1000.0);
   rel_diff = (loop2_seconds - loop1_seconds) / loop1_seconds *100;
   if (PrintAssembly) {
     ttyLocker ttyl;
     tty->print_cr("Decoding section size detection stub at " INTPTR_FORMAT " before execution:", code);
     Disassembler::decode((u_char*)code, (u_char*)code_end, tty);
     tty->print_cr("Time loop1 :%f", loop1_seconds);
     tty->print_cr("Time loop2 :%f", loop2_seconds);
     tty->print_cr("(time2 - time1) / time1 = %f %%", rel_diff);
     if (rel_diff > 12.0) {
       tty->print_cr("Section Size 8 Instructions");
     } else{
       tty->print_cr("Section Size 32 Instructions or Power5");
     }
   }
 #if 0 // TODO: PPC port
   // Set sector size (if not set explicitly).
   if (FLAG_IS_DEFAULT(Power6SectorSize128PPC64)) {
     if (rel_diff > 12.0) {
       PdScheduling::power6SectorSize = 0x20;
     } else {
       PdScheduling::power6SectorSize = 0x80;
     }
   } else if (Power6SectorSize128PPC64) {
     PdScheduling::power6SectorSize = 0x80;
   } else {
     PdScheduling::power6SectorSize = 0x20;
   }
 #endif
   if (UsePower6SchedulerPPC64) Unimplemented();
 }
 #endif // COMPILER2
 void VM_Version::determine_features() {
   const int code_size = (num_features+1+2*7)*BytesPerInstWord; // 7 InstWords for each call (function descriptor + blr instruction)
   int features = 0;
   // create test area
   enum { BUFFER_SIZE = 2*4*K }; // needs to be >=2* max cache line size (cache line size can't exceed min page size)
   char test_area[BUFFER_SIZE];
   char *mid_of_test_area = &test_area[BUFFER_SIZE>>1];
   // Allocate space for the code
   ResourceMark rm;
   CodeBuffer cb("detect_cpu_features", code_size, 0);
   MacroAssembler* a = new MacroAssembler(&cb);
   // emit code.
   void (*test)(address addr, uint64_t offset)=(void(*)(address addr, uint64_t offset))(void *)a->emit_fd();
   uint32_t *code = (uint32_t *)a->pc();
   // Don't use R0 in ldarx.
   // keep R3_ARG1 = R3 unmodified, it contains &field (see below)
   // keep R4_ARG2 = R4 unmodified, it contains offset = 0 (see below)
   a->fsqrt(F3, F4);                         // code[0] -> fsqrt_m
   a->isel(R7, R5, R6, 0);                   // code[1] -> isel_m
   a->ldarx_unchecked(R7, R3_ARG1, R4_ARG2, 1);// code[2] -> lxarx_m
   a->cmpb(R7, R5, R6);                      // code[3] -> bcmp
   //a->mftgpr(R7, F3);                      // code[4] -> mftgpr
   a->popcntb(R7, R5);                       // code[5] -> popcntb
   a->popcntw(R7, R5);                       // code[6] -> popcntw
   a->fcfids(F3, F4);                        // code[7] -> fcfids
   a->vand(VR0, VR0, VR0);                   // code[8] -> vand
   a->blr();
   // Emit function to set one cache line to zero
   void (*zero_cacheline_func_ptr)(char*) = (void(*)(char*))(void *)a->emit_fd(); // emit function descriptor and get pointer to it
   a->dcbz(R3_ARG1); // R3_ARG1 = R3 = addr
   a->blr();
   uint32_t *code_end = (uint32_t *)a->pc();
   a->flush();
   // Print the detection code.
   if (PrintAssembly) {
     ttyLocker ttyl;
     tty->print_cr("Decoding cpu-feature detection stub at " INTPTR_FORMAT " before execution:", code);
     Disassembler::decode((u_char*)code, (u_char*)code_end, tty);
   }
   // Measure cache line size.
   memset(test_area, 0xFF, BUFFER_SIZE); // fill test area with 0xFF
   (*zero_cacheline_func_ptr)(mid_of_test_area); // call function which executes dcbz to the middle
   int count = 0; // count zeroed bytes
   for (int i = 0; i < BUFFER_SIZE; i++) if (test_area[i] == 0) count++;
   guarantee(is_power_of_2(count), "cache line size needs to be a power of 2");
   _measured_cache_line_size = count;
   // Execute code. Illegal instructions will be replaced by 0 in the signal handler.
   VM_Version::_is_determine_features_test_running = true;
   (*test)((address)mid_of_test_area, (uint64_t)0);
   VM_Version::_is_determine_features_test_running = false;
   // determine which instructions are legal.
   int feature_cntr = 0;
   if (code[feature_cntr++]) features |= fsqrt_m;
   if (code[feature_cntr++]) features |= isel_m;
   if (code[feature_cntr++]) features |= lxarxeh_m;
   if (code[feature_cntr++]) features |= cmpb_m;
   //if(code[feature_cntr++])features |= mftgpr_m;
   if (code[feature_cntr++]) features |= popcntb_m;
   if (code[feature_cntr++]) features |= popcntw_m;
   if (code[feature_cntr++]) features |= fcfids_m;
   if (code[feature_cntr++]) features |= vand_m;
   // Print the detection code.
   if (PrintAssembly) {
     ttyLocker ttyl;
     tty->print_cr("Decoding cpu-feature detection stub at " INTPTR_FORMAT " after execution:", code);
     Disassembler::decode((u_char*)code, (u_char*)code_end, tty);
   }
   _features = features;
 }
 static int saved_features = 0;
 void VM_Version::allow_all() {
   saved_features = _features;
   _features      = all_features_m;
 }
 void VM_Version::revert() {
   _features = saved_features;
 }

Mercurial > jdk8-mips64-public > hotspot / annotate

src/cpu/ppc/vm/vm_version_ppc.cpp@41b780b43b74 (annotated)

src/cpu/ppc/vm/vm_version_ppc.cpp