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Improve performance of bitscanning intrinsics

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This change helps spectre more intelligently plan execution, by working
around false output dependencies, impacting ops like popcnt bsr and bsf
This commit is contained in:
Justine Tunney 2021-06-15 06:24:46 -07:00
parent 29cb53881e
commit 87d7010495
13 changed files with 100 additions and 224 deletions
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33
libc/testlib/blocktronics.S Normal file
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@ -0,0 +1,33 @@
/*-*- mode:unix-assembly; indent-tabs-mode:t; tab-width:8; coding:utf-8 -*-│
│vi: set et ft=asm ts=8 tw=8 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2020 Justine Alexandra Roberts Tunney │
│ │
│ Permission to use, copy, modify, and/or distribute this software for │
│ any purpose with or without fee is hereby granted, provided that the │
│ above copyright notice and this permission notice appear in all copies. │
│ │
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/macros.internal.h"
.source __FILE__
.rodata
// Nontrivial NUL-terminated string test vector.
.align 1
kBlocktronics:
0: .incbin "libc/testlib/blocktronics.txt"
1: .byte 0
.endobj kBlocktronics,globl
.align 8
kBlocktronicsSize:
.quad 1b-0b
.endobj kBlocktronicsSize,globl

12
libc/testlib/blocktronics.h Normal file
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@ -0,0 +1,12 @@
#ifndef COSMOPOLITAN_LIBC_TESTLIB_BLOCKTRONICS_H_
#define COSMOPOLITAN_LIBC_TESTLIB_BLOCKTRONICS_H_
#if !(__ASSEMBLER__ + __LINKER__ + 0)
COSMOPOLITAN_C_START_
extern size_t kBlocktronicsSize;
extern char kBlocktronics[];
extern uint8_t kBlocktronicsZip[];
COSMOPOLITAN_C_END_
#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
#endif /* COSMOPOLITAN_LIBC_TESTLIB_BLOCKTRONICS_H_ */

32
libc/testlib/blocktronics.txt Normal file
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░▄██▒▄█ ▐██ ░░░ ▀▀████▒▀█▄
▐███▓██░ ██▌ ▀████▄■█▄
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▀██ ▄███████▄████████▀░░ ░▄██
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▀██████▀■▄█▄▄ ░▀███████████████▓▓░░▄██▀▄████▄▄▀▄
█▀█ █ █▀█ █▀█ █▄▀ ▐▀█▀▌█▀█ █▀█ █▄ █ ▀█▀ █▀█ █▀▀
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THERE WILL BE BLOCKS march 01 2017

5
libc/testlib/testlib.mk
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@ -13,11 +13,13 @@ LIBC_TESTLIB_A = o/$(MODE)/libc/testlib/testlib.a
LIBC_TESTLIB_A_CHECKS = $(LIBC_TESTLIB_A).pkg
LIBC_TESTLIB_A_ASSETS = \
libc/testlib/hyperion.txt
libc/testlib/hyperion.txt \
libc/testlib/blocktronics.txt
LIBC_TESTLIB_A_HDRS = \
libc/testlib/bench.h \
libc/testlib/ezbench.h \
libc/testlib/blocktronics.h \
libc/testlib/hyperion.h \
libc/testlib/testlib.h
@ -25,6 +27,7 @@ LIBC_TESTLIB_A_SRCS_S = \
libc/testlib/bench.S \
libc/testlib/combo.S \
libc/testlib/fixture.S \
libc/testlib/blocktronics.S \
libc/testlib/hyperion.S \
libc/testlib/testcase.S \
libc/testlib/thrashcodecache.S \