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6987135: Performance regression on Intel platform with 32-bits edition between 6u13 and 6u14

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Use hardware DIV instruction for long division by constant when it is faster than code with multiply.

Reviewed-by: never
This commit is contained in:
Vladimir Kozlov 2010-11-02 09:00:37 -07:00
parent ce0125e7f2
commit 249b1f6c4f
10 changed files with 180 additions and 23 deletions
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9
hotspot/src/cpu/sparc/vm/vm_version_sparc.cpp
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@ -1,5 +1,5 @@
/*
* Copyright (c) 1997, 2009, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 1997, 2010, Oracle and/or its affiliates. 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
@ -80,7 +80,8 @@ void VM_Version::initialize() {
FLAG_SET_DEFAULT(InteriorEntryAlignment, 4);
}
if (is_niagara1_plus()) {
if (AllocatePrefetchStyle > 0 && FLAG_IS_DEFAULT(AllocatePrefetchStyle)) {
if (has_blk_init() && AllocatePrefetchStyle > 0 &&
FLAG_IS_DEFAULT(AllocatePrefetchStyle)) {
// Use BIS instruction for allocation prefetch.
FLAG_SET_DEFAULT(AllocatePrefetchStyle, 3);
if (FLAG_IS_DEFAULT(AllocatePrefetchDistance)) {
@ -118,16 +119,18 @@ void VM_Version::initialize() {
#endif
char buf[512];
jio_snprintf(buf, sizeof(buf), "%s%s%s%s%s%s%s%s%s%s%s%s",
jio_snprintf(buf, sizeof(buf), "%s%s%s%s%s%s%s%s%s%s%s%s%s%s",
(has_v8() ? ", has_v8" : ""),
(has_v9() ? ", has_v9" : ""),
(has_hardware_popc() ? ", popc" : ""),
(has_vis1() ? ", has_vis1" : ""),
(has_vis2() ? ", has_vis2" : ""),
(has_blk_init() ? ", has_blk_init" : ""),
(is_ultra3() ? ", is_ultra3" : ""),
(is_sun4v() ? ", is_sun4v" : ""),
(is_niagara1() ? ", is_niagara1" : ""),
(is_niagara1_plus() ? ", is_niagara1_plus" : ""),
(is_sparc64() ? ", is_sparc64" : ""),
(!has_hardware_mul32() ? ", no-mul32" : ""),
(!has_hardware_div32() ? ", no-div32" : ""),
(!has_hardware_fsmuld() ? ", no-fsmuld" : ""));